odin-lang.Odin/src/llvm_backend_proc.cpp

lbProcedure *lb_create_procedure(lbModule *m, Entity *entity, bool ignore_body) {
	GB_ASSERT(entity != nullptr);
	GB_ASSERT(entity->kind == Entity_Procedure);
	if (!entity->Procedure.is_foreign) {
		GB_ASSERT(entity->flags & EntityFlag_ProcBodyChecked);
	}

	String link_name = {};

	if (ignore_body) {
		lbModule *other_module = lb_pkg_module(m->gen, entity->pkg);
		link_name = lb_get_entity_name(other_module, entity);
	} else {
		link_name = lb_get_entity_name(m, entity);
	}

	{
		StringHashKey key = string_hash_string(link_name);
		lbValue *found = string_map_get(&m->members, key);
		if (found) {
			lb_add_entity(m, entity, *found);
			return string_map_must_get(&m->procedures, key);
		}
	}


	lbProcedure *p = gb_alloc_item(permanent_allocator(), lbProcedure);

	p->module = m;
	entity->code_gen_module = m;
	entity->code_gen_procedure = p;
	p->entity = entity;
	p->name = link_name;

	DeclInfo *decl = entity->decl_info;

	ast_node(pl, ProcLit, decl->proc_lit);
	Type *pt = base_type(entity->type);
	GB_ASSERT(pt->kind == Type_Proc);

	p->type           = entity->type;
	p->type_expr      = decl->type_expr;
	p->body           = pl->body;
	p->inlining       = pl->inlining;
	p->is_foreign     = entity->Procedure.is_foreign;
	p->is_export      = entity->Procedure.is_export;
	p->is_entry_point = false;

	gbAllocator a = heap_allocator();
	p->children.allocator      = a;
	p->params.allocator        = a;
	p->defer_stmts.allocator   = a;
	p->blocks.allocator        = a;
	p->branch_blocks.allocator = a;
	p->context_stack.allocator = a;
	p->scope_stack.allocator   = a;

	if (p->is_foreign) {
		lb_add_foreign_library_path(p->module, entity->Procedure.foreign_library);
	}

	char *c_link_name = alloc_cstring(permanent_allocator(), p->name);
	LLVMTypeRef func_ptr_type = lb_type(m, p->type);
	LLVMTypeRef func_type = LLVMGetElementType(func_ptr_type);

	p->value = LLVMAddFunction(m->mod, c_link_name, func_type);

	lb_ensure_abi_function_type(m, p);
	lb_add_function_type_attributes(p->value, p->abi_function_type, p->abi_function_type->calling_convention);
	if (false) {
		lbCallingConventionKind cc_kind = lbCallingConvention_C;
		// TODO(bill): Clean up this logic
		if (!is_arch_wasm()) {
			cc_kind = lb_calling_convention_map[pt->Proc.calling_convention];
		}
		LLVMSetFunctionCallConv(p->value, cc_kind);
	}


	if (pt->Proc.diverging) {
		lb_add_attribute_to_proc(m, p->value, "noreturn");
	}

	if (pt->Proc.calling_convention == ProcCC_Naked) {
		lb_add_attribute_to_proc(m, p->value, "naked");
	}

	switch (p->inlining) {
	case ProcInlining_inline:
		lb_add_attribute_to_proc(m, p->value, "alwaysinline");
		break;
	case ProcInlining_no_inline:
		lb_add_attribute_to_proc(m, p->value, "noinline");
		break;
	}

	if (entity->flags & EntityFlag_Cold) {
		lb_add_attribute_to_proc(m, p->value, "cold");
	}

	switch (entity->Procedure.optimization_mode) {
	case ProcedureOptimizationMode_None:
		lb_add_attribute_to_proc(m, p->value, "optnone");
		break;
	case ProcedureOptimizationMode_Minimal:
		lb_add_attribute_to_proc(m, p->value, "optnone");
		break;
	case ProcedureOptimizationMode_Size:
		lb_add_attribute_to_proc(m, p->value, "optsize");
		break;
	case ProcedureOptimizationMode_Speed:
		// TODO(bill): handle this correctly
		lb_add_attribute_to_proc(m, p->value, "optsize");
		break;
	}



	// lbCallingConventionKind cc_kind = lbCallingConvention_C;
	// // TODO(bill): Clean up this logic
	// if (build_context.metrics.os != TargetOs_js)  {
	// 	cc_kind = lb_calling_convention_map[pt->Proc.calling_convention];
	// }
	// LLVMSetFunctionCallConv(p->value, cc_kind);
	lbValue proc_value = {p->value, p->type};
	lb_add_entity(m, entity,  proc_value);
	lb_add_member(m, p->name, proc_value);
	lb_add_procedure_value(m, p);

	if (p->is_export) {
		LLVMSetLinkage(p->value, LLVMDLLExportLinkage);
		LLVMSetDLLStorageClass(p->value, LLVMDLLExportStorageClass);
		LLVMSetVisibility(p->value, LLVMDefaultVisibility);

		if (is_arch_wasm()) {
			char const *export_name = alloc_cstring(permanent_allocator(), p->name);
			LLVMAddTargetDependentFunctionAttr(p->value, "wasm-export-name", export_name);
		}
	} else if (!p->is_foreign) {
		if (!USE_SEPARATE_MODULES) {
			LLVMSetLinkage(p->value, LLVMInternalLinkage);

			// NOTE(bill): if a procedure is defined in package runtime and uses a custom link name,
			// then it is very likely it is required by LLVM and thus cannot have internal linkage
			if (entity->pkg != nullptr && entity->pkg->kind == Package_Runtime && p->body != nullptr) {
				GB_ASSERT(entity->kind == Entity_Procedure);
				if (entity->Procedure.link_name != "") {
					LLVMSetLinkage(p->value, LLVMExternalLinkage);
				}
			}
		}
	}

	if (p->is_foreign) {
		if (is_arch_wasm()) {
			char const *import_name = alloc_cstring(permanent_allocator(), p->name);
			char const *module_name = "env";
			if (entity->Procedure.foreign_library != nullptr) {
				Entity *foreign_library = entity->Procedure.foreign_library;
				GB_ASSERT(foreign_library->kind == Entity_LibraryName);
				if (foreign_library->LibraryName.paths.count > 0)  {
					module_name = alloc_cstring(permanent_allocator(), foreign_library->LibraryName.paths[0]);
				}
			}
			LLVMAddTargetDependentFunctionAttr(p->value, "wasm-import-name",   import_name);
			LLVMAddTargetDependentFunctionAttr(p->value, "wasm-import-module", module_name);
		}
	}

	// NOTE(bill): offset==0 is the return value
	isize offset = 1;
	if (pt->Proc.return_by_pointer) {
		offset = 2;
	}

	isize parameter_index = 0;
	if (pt->Proc.param_count) {
		TypeTuple *params = &pt->Proc.params->Tuple;
		for (isize i = 0; i < pt->Proc.param_count; i++) {
			Entity *e = params->variables[i];
			if (e->kind != Entity_Variable) {
				continue;
			}

			if (i+1 == params->variables.count && pt->Proc.c_vararg) {
				continue;
			}

			if (e->flags&EntityFlag_NoAlias) {
				lb_add_proc_attribute_at_index(p, offset+parameter_index, "noalias");
			}
			parameter_index += 1;
		}
	}

	if (ignore_body) {
		p->body = nullptr;
		LLVMSetLinkage(p->value, LLVMExternalLinkage);
	}


	if (m->debug_builder) { // Debug Information
		Type *bt = base_type(p->type);

		unsigned line = cast(unsigned)entity->token.pos.line;

		LLVMMetadataRef scope = nullptr;
		LLVMMetadataRef file = nullptr;
		LLVMMetadataRef type = nullptr;
		scope = p->module->debug_compile_unit;
		type = lb_debug_type_internal_proc(m, bt);

		Ast *ident = entity->identifier.load();
		if (entity->file != nullptr) {
			file = lb_get_llvm_metadata(m, entity->file);
			scope = file;
		} else if (ident != nullptr && ident->file != nullptr) {
			file = lb_get_llvm_metadata(m, ident->file);
			scope = file;
		} else if (entity->scope != nullptr) {
			file = lb_get_llvm_metadata(m, entity->scope->file);
			scope = file;
		}
		GB_ASSERT_MSG(file != nullptr, "%.*s", LIT(entity->token.string));

		// LLVMBool is_local_to_unit = !entity->Procedure.is_export;
		LLVMBool is_local_to_unit = false;
		LLVMBool is_definition = p->body != nullptr;
		unsigned scope_line = line;
		u32 flags = LLVMDIFlagStaticMember;
		LLVMBool is_optimized = false;
		if (bt->Proc.diverging) {
			flags |= LLVMDIFlagNoReturn;
		}
		if (p->body == nullptr) {
			flags |= LLVMDIFlagPrototyped;
			is_optimized = false;
		}

		if (p->body != nullptr) {
			p->debug_info = LLVMDIBuilderCreateFunction(m->debug_builder, scope,
				cast(char const *)entity->token.string.text, entity->token.string.len,
				cast(char const *)p->name.text, p->name.len,
				file, line, type,
				is_local_to_unit, is_definition,
				scope_line, cast(LLVMDIFlags)flags, is_optimized
			);
			GB_ASSERT(p->debug_info != nullptr);
			LLVMSetSubprogram(p->value, p->debug_info);
			lb_set_llvm_metadata(m, p, p->debug_info);
		}
	}

	return p;
}

lbProcedure *lb_create_dummy_procedure(lbModule *m, String link_name, Type *type) {
	{
		lbValue *found = string_map_get(&m->members, link_name);
		GB_ASSERT(found == nullptr);
	}

	lbProcedure *p = gb_alloc_item(permanent_allocator(), lbProcedure);

	p->module = m;
	p->name = link_name;

	p->type           = type;
	p->type_expr      = nullptr;
	p->body           = nullptr;
	p->tags           = 0;
	p->inlining       = ProcInlining_none;
	p->is_foreign     = false;
	p->is_export      = false;
	p->is_entry_point = false;

	gbAllocator a = permanent_allocator();
	p->children.allocator      = a;
	p->params.allocator        = a;
	p->defer_stmts.allocator   = a;
	p->blocks.allocator        = a;
	p->branch_blocks.allocator = a;
	p->context_stack.allocator = a;


	char *c_link_name = alloc_cstring(permanent_allocator(), p->name);
	LLVMTypeRef func_ptr_type = lb_type(m, p->type);
	LLVMTypeRef func_type = LLVMGetElementType(func_ptr_type);

	p->value = LLVMAddFunction(m->mod, c_link_name, func_type);

	Type *pt = p->type;
	lbCallingConventionKind cc_kind = lbCallingConvention_C;
	// TODO(bill): Clean up this logic
	if (!is_arch_wasm()) {
		cc_kind = lb_calling_convention_map[pt->Proc.calling_convention];
	}
	LLVMSetFunctionCallConv(p->value, cc_kind);
	lbValue proc_value = {p->value, p->type};
	lb_add_member(m, p->name, proc_value);
	lb_add_procedure_value(m, p);


	// NOTE(bill): offset==0 is the return value
	isize offset = 1;
	if (pt->Proc.return_by_pointer) {
		lb_add_proc_attribute_at_index(p, 1, "sret");
		lb_add_proc_attribute_at_index(p, 1, "noalias");
		offset = 2;
	}

	isize parameter_index = 0;
	if (pt->Proc.calling_convention == ProcCC_Odin) {
		lb_add_proc_attribute_at_index(p, offset+parameter_index, "noalias");
		lb_add_proc_attribute_at_index(p, offset+parameter_index, "nonnull");
		lb_add_proc_attribute_at_index(p, offset+parameter_index, "nocapture");
	}

	return p;
}


lbValue lb_value_param(lbProcedure *p, Entity *e, Type *abi_type, i32 index, lbParamPasskind *kind_) {
	lbParamPasskind kind = lbParamPass_Value;

	if (e != nullptr && !are_types_identical(abi_type, e->type)) {
		if (is_type_pointer(abi_type)) {
			GB_ASSERT(e->kind == Entity_Variable);
			Type *av = core_type(type_deref(abi_type));
			if (are_types_identical(av, core_type(e->type))) {
				kind = lbParamPass_Pointer;
				if (e->flags&EntityFlag_Value) {
					kind = lbParamPass_ConstRef;
				}
			} else {
				kind = lbParamPass_BitCast;
			}
		} else if (is_type_integer(abi_type)) {
			kind = lbParamPass_Integer;
		} else if (abi_type == t_llvm_bool) {
			kind = lbParamPass_Value;
		} else if (is_type_boolean(abi_type)) {
			kind = lbParamPass_Integer;
		} else if (is_type_simd_vector(abi_type)) {
			kind = lbParamPass_BitCast;
		} else if (is_type_float(abi_type)) {
			kind = lbParamPass_BitCast;
		} else if (is_type_tuple(abi_type)) {
			kind = lbParamPass_Tuple;
		} else if (is_type_proc(abi_type)) {
			kind = lbParamPass_Value;
		} else {
			GB_PANIC("Invalid abi type pass kind %s", type_to_string(abi_type));
		}
	}

	if (kind_) *kind_ = kind;
	lbValue res = {};
	res.value = LLVMGetParam(p->value, cast(unsigned)index);
	res.type = abi_type;
	return res;
}



void lb_start_block(lbProcedure *p, lbBlock *b) {
	GB_ASSERT(b != nullptr);
	if (!b->appended) {
		b->appended = true;
		LLVMAppendExistingBasicBlock(p->value, b->block);
	}
	LLVMPositionBuilderAtEnd(p->builder, b->block);
	p->curr_block = b;
}

void lb_begin_procedure_body(lbProcedure *p) {
	DeclInfo *decl = decl_info_of_entity(p->entity);
	if (decl != nullptr) {
		for_array(i, decl->labels) {
			BlockLabel bl = decl->labels[i];
			lbBranchBlocks bb = {bl.label, nullptr, nullptr};
			array_add(&p->branch_blocks, bb);
		}
	}

	p->builder = LLVMCreateBuilderInContext(p->module->ctx);

	p->decl_block  = lb_create_block(p, "decls", true);
	p->entry_block = lb_create_block(p, "entry", true);
	lb_start_block(p, p->entry_block);

	GB_ASSERT(p->type != nullptr);

	lb_ensure_abi_function_type(p->module, p);
	{
		lbFunctionType *ft = p->abi_function_type;

		unsigned param_offset = 0;

		lbValue return_ptr_value = {};
		if (ft->ret.kind == lbArg_Indirect) {
			// NOTE(bill): this must be parameter 0

			String name = str_lit("agg.result");

			Type *ptr_type = alloc_type_pointer(reduce_tuple_to_single_type(p->type->Proc.results));
			Entity *e = alloc_entity_param(nullptr, make_token_ident(name), ptr_type, false, false);
			e->flags |= EntityFlag_Sret | EntityFlag_NoAlias;

			return_ptr_value.value = LLVMGetParam(p->value, 0);
			LLVMSetValueName2(return_ptr_value.value, cast(char const *)name.text, name.len);
			return_ptr_value.type = ptr_type;
			p->return_ptr = lb_addr(return_ptr_value);

			lb_add_entity(p->module, e, return_ptr_value);

			param_offset += 1;
		}

		if (p->type->Proc.params != nullptr) {
			TypeTuple *params = &p->type->Proc.params->Tuple;

			unsigned param_index = 0;
			for_array(i, params->variables) {
				Entity *e = params->variables[i];
				if (e->kind != Entity_Variable) {
					continue;
				}

				lbArgType *arg_type = &ft->args[param_index];
				if (arg_type->kind == lbArg_Ignore) {
					continue;
				} else if (arg_type->kind == lbArg_Direct) {
					lbParamPasskind kind = lbParamPass_Value;
					LLVMTypeRef param_type = lb_type(p->module, e->type);
					if (param_type != arg_type->type) {
						kind = lbParamPass_BitCast;
					}
					LLVMValueRef value = LLVMGetParam(p->value, param_offset+param_index);

					value = OdinLLVMBuildTransmute(p, value, param_type);

					lbValue param = {};
					param.value = value;
					param.type = e->type;
					array_add(&p->params, param);

					if (e->token.string.len != 0) {
						lbAddr l = lb_add_local(p, e->type, e, false, param_index);
						lb_addr_store(p, l, param);
					}

					param_index += 1;
				} else if (arg_type->kind == lbArg_Indirect) {
					LLVMValueRef value_ptr = LLVMGetParam(p->value, param_offset+param_index);
					LLVMValueRef value = LLVMBuildLoad(p->builder, value_ptr, "");

					lbValue param = {};
					param.value = value;
					param.type = e->type;
					array_add(&p->params, param);

					lbValue ptr = {};
					ptr.value = value_ptr;
					ptr.type = alloc_type_pointer(e->type);

					lb_add_entity(p->module, e, ptr);
					param_index += 1;
				}
			}
		}

		if (p->type->Proc.has_named_results) {
			GB_ASSERT(p->type->Proc.result_count > 0);
			TypeTuple *results = &p->type->Proc.results->Tuple;

			for_array(i, results->variables) {
				Entity *e = results->variables[i];
				GB_ASSERT(e->kind == Entity_Variable);

				if (e->token.string != "") {
					GB_ASSERT(!is_blank_ident(e->token));

					lbAddr res = {};
					if (return_ptr_value.value) {
						lbValue ptr = return_ptr_value;
						if (results->variables.count != 1) {
							ptr = lb_emit_struct_ep(p, ptr, cast(i32)i);
						}

						res = lb_addr(ptr);
						lb_add_entity(p->module, e, ptr);
					} else {
						res = lb_add_local(p, e->type, e);
					}

					if (e->Variable.param_value.kind != ParameterValue_Invalid) {
						lbValue c = lb_handle_param_value(p, e->type, e->Variable.param_value, e->token.pos);
						lb_addr_store(p, res, c);
					}
				}
			}
		}
	}
	if (p->type->Proc.calling_convention == ProcCC_Odin) {
		lb_push_context_onto_stack_from_implicit_parameter(p);
	}

	lb_start_block(p, p->entry_block);

	if (p->debug_info != nullptr) {
		TokenPos pos = {};
		if (p->body != nullptr) {
			pos = ast_token(p->body).pos;
		} else if (p->type_expr != nullptr) {
			pos = ast_token(p->type_expr).pos;
		} else if (p->entity != nullptr) {
			pos = p->entity->token.pos;
		}
		if (pos.file_id != 0) {
			LLVMSetCurrentDebugLocation2(p->builder, lb_debug_location_from_token_pos(p, pos));
		}

		if (p->context_stack.count != 0) {
			lb_add_debug_context_variable(p, lb_find_or_generate_context_ptr(p));
		}

	}
}

void lb_end_procedure_body(lbProcedure *p) {
	LLVMPositionBuilderAtEnd(p->builder, p->decl_block->block);
	LLVMBuildBr(p->builder, p->entry_block->block);
	LLVMPositionBuilderAtEnd(p->builder, p->curr_block->block);

	LLVMValueRef instr = nullptr;

	// Make sure there is a "ret void" at the end of a procedure with no return type
	if (p->type->Proc.result_count == 0) {
		instr = LLVMGetLastInstruction(p->curr_block->block);
		if (!lb_is_instr_terminating(instr)) {
			lb_emit_defer_stmts(p, lbDeferExit_Return, nullptr);
			LLVMBuildRetVoid(p->builder);
		}
	}

	LLVMBasicBlockRef first_block = LLVMGetFirstBasicBlock(p->value);
	LLVMBasicBlockRef block = nullptr;

	// Make sure every block terminates, and if not, make it unreachable
	for (block = first_block; block != nullptr; block = LLVMGetNextBasicBlock(block)) {
		instr = LLVMGetLastInstruction(block);
		if (instr == nullptr || !lb_is_instr_terminating(instr)) {
			LLVMPositionBuilderAtEnd(p->builder, block);
			LLVMBuildUnreachable(p->builder);
		}
	}

	p->curr_block = nullptr;
	p->state_flags = 0;
}
void lb_end_procedure(lbProcedure *p) {
	LLVMDisposeBuilder(p->builder);
}

void lb_build_nested_proc(lbProcedure *p, AstProcLit *pd, Entity *e) {
	GB_ASSERT(pd->body != nullptr);
	lbModule *m = p->module;
	auto *min_dep_set = &m->info->minimum_dependency_set;

	if (ptr_set_exists(min_dep_set, e) == false) {
		// NOTE(bill): Nothing depends upon it so doesn't need to be built
		return;
	}

	// NOTE(bill): Generate a new name
	// parent.name-guid
	String original_name = e->token.string;
	String pd_name = original_name;
	if (e->Procedure.link_name.len > 0) {
		pd_name = e->Procedure.link_name;
	}


	isize name_len = p->name.len + 1 + pd_name.len + 1 + 10 + 1;
	char *name_text = gb_alloc_array(permanent_allocator(), char, name_len);

	i32 guid = cast(i32)p->children.count;
	name_len = gb_snprintf(name_text, name_len, "%.*s.%.*s-%d", LIT(p->name), LIT(pd_name), guid);
	String name = make_string(cast(u8 *)name_text, name_len-1);

	e->Procedure.link_name = name;

	lbProcedure *nested_proc = lb_create_procedure(p->module, e);
	e->code_gen_procedure = nested_proc;

	lbValue value = {};
	value.value = nested_proc->value;
	value.type = nested_proc->type;

	lb_add_entity(m, e, value);
	array_add(&p->children, nested_proc);
	array_add(&m->procedures_to_generate, nested_proc);
}



Array<lbValue> lb_value_to_array(lbProcedure *p, lbValue value) {
	Array<lbValue> array = {};
	Type *t = base_type(value.type);
	if (t == nullptr) {
		// Do nothing
	} else if (is_type_tuple(t)) {
		GB_ASSERT(t->kind == Type_Tuple);
		auto *rt = &t->Tuple;
		if (rt->variables.count > 0) {
			array = array_make<lbValue>(permanent_allocator(), rt->variables.count);
			for_array(i, rt->variables) {
				lbValue elem = lb_emit_struct_ev(p, value, cast(i32)i);
				array[i] = elem;
			}
		}
	} else {
		array = array_make<lbValue>(permanent_allocator(), 1);
		array[0] = value;
	}
	return array;
}



lbValue lb_emit_call_internal(lbProcedure *p, lbValue value, lbValue return_ptr, Array<lbValue> const &processed_args, Type *abi_rt, lbAddr context_ptr, ProcInlining inlining) {
	GB_ASSERT(p->module->ctx == LLVMGetTypeContext(LLVMTypeOf(value.value)));

	unsigned arg_count = cast(unsigned)processed_args.count;
	if (return_ptr.value != nullptr) {
		arg_count += 1;
	}
	if (context_ptr.addr.value != nullptr) {
		arg_count += 1;
	}

	LLVMValueRef *args = gb_alloc_array(permanent_allocator(), LLVMValueRef, arg_count);
	isize arg_index = 0;
	if (return_ptr.value != nullptr) {
		args[arg_index++] = return_ptr.value;
	}
	for_array(i, processed_args) {
		lbValue arg = processed_args[i];
		args[arg_index++] = arg.value;
	}
	if (context_ptr.addr.value != nullptr) {
		LLVMValueRef cp = context_ptr.addr.value;
		cp = LLVMBuildPointerCast(p->builder, cp, lb_type(p->module, t_rawptr), "");
		args[arg_index++] = cp;
	}
	LLVMBasicBlockRef curr_block = LLVMGetInsertBlock(p->builder);
	GB_ASSERT(curr_block != p->decl_block->block);

	{
		LLVMTypeRef ftp = lb_type(p->module, value.type);
		LLVMValueRef fn = value.value;
		if (!lb_is_type_kind(LLVMTypeOf(value.value), LLVMFunctionTypeKind)) {
			fn = LLVMBuildPointerCast(p->builder, fn, ftp, "");
		}
		LLVMTypeRef fnp = LLVMGetElementType(LLVMTypeOf(fn));
		GB_ASSERT_MSG(lb_is_type_kind(fnp, LLVMFunctionTypeKind), "%s", LLVMPrintTypeToString(fnp));

		{
			unsigned param_count = LLVMCountParamTypes(fnp);
			GB_ASSERT(arg_count >= param_count);

			LLVMTypeRef *param_types = gb_alloc_array(temporary_allocator(), LLVMTypeRef, param_count);
			LLVMGetParamTypes(fnp, param_types);
			for (unsigned i = 0; i < param_count; i++) {
				LLVMTypeRef param_type = param_types[i];
				LLVMTypeRef arg_type = LLVMTypeOf(args[i]);
				// LLVMTypeKind param_kind = LLVMGetTypeKind(param_type);
				// LLVMTypeKind arg_kind = LLVMGetTypeKind(arg_type);
				GB_ASSERT_MSG(
					arg_type == param_type,
					"Parameter types do not match: %s != %s, argument: %s",
					LLVMPrintTypeToString(arg_type),
					LLVMPrintTypeToString(param_type),
					LLVMPrintValueToString(args[i])
				);
			}
		}

		LLVMValueRef ret = LLVMBuildCall2(p->builder, fnp, fn, args, arg_count, "");

		switch (inlining) {
		case ProcInlining_none:
			break;
		case ProcInlining_inline:
			LLVMAddCallSiteAttribute(ret, LLVMAttributeIndex_FunctionIndex, lb_create_enum_attribute(p->module->ctx, "alwaysinline"));
			break;
		case ProcInlining_no_inline:
			LLVMAddCallSiteAttribute(ret, LLVMAttributeIndex_FunctionIndex, lb_create_enum_attribute(p->module->ctx, "noinline"));
			break;
		}

		lbValue res = {};
		res.value = ret;
		res.type = abi_rt;
		return res;
	}
}


lbValue lb_lookup_runtime_procedure(lbModule *m, String const &name) {
	AstPackage *pkg = m->info->runtime_package;
	Entity *e = scope_lookup_current(pkg->scope, name);
	return lb_find_procedure_value_from_entity(m, e);
}


lbValue lb_emit_runtime_call(lbProcedure *p, char const *c_name, Array<lbValue> const &args) {
	String name = make_string_c(c_name);
	lbValue proc = lb_lookup_runtime_procedure(p->module, name);
	return lb_emit_call(p, proc, args);
}

lbValue lb_emit_call(lbProcedure *p, lbValue value, Array<lbValue> const &args, ProcInlining inlining, bool use_copy_elision_hint) {
	lbModule *m = p->module;

	Type *pt = base_type(value.type);
	GB_ASSERT(pt->kind == Type_Proc);
	Type *results = pt->Proc.results;

	if (p->entity != nullptr) {
		if (p->entity->flags & EntityFlag_Disabled) {
			return {};
		}
	}

	lbAddr context_ptr = {};
	if (pt->Proc.calling_convention == ProcCC_Odin) {
		context_ptr = lb_find_or_generate_context_ptr(p);
	}

	defer (if (pt->Proc.diverging) {
		LLVMBuildUnreachable(p->builder);
	});

	bool is_c_vararg = pt->Proc.c_vararg;
	isize param_count = pt->Proc.param_count;
	if (is_c_vararg) {
		GB_ASSERT(param_count-1 <= args.count);
		param_count -= 1;
	} else {
		GB_ASSERT_MSG(param_count == args.count, "%td == %td", param_count, args.count);
	}

	lbValue result = {};

	auto processed_args = array_make<lbValue>(permanent_allocator(), 0, args.count);

	{
		lbFunctionType *ft = lb_get_function_type(m, p, pt);
		bool return_by_pointer = ft->ret.kind == lbArg_Indirect;

		unsigned param_index = 0;
		for (isize i = 0; i < param_count; i++) {
			Entity *e = pt->Proc.params->Tuple.variables[i];
			if (e->kind != Entity_Variable) {
				continue;
			}
			GB_ASSERT(e->flags & EntityFlag_Param);

			Type *original_type = e->type;
			lbArgType *arg = &ft->args[param_index];
			if (arg->kind == lbArg_Ignore) {
				continue;
			}

			lbValue x = lb_emit_conv(p, args[i], original_type);
			LLVMTypeRef xt = lb_type(p->module, x.type);

			if (arg->kind == lbArg_Direct) {
				LLVMTypeRef abi_type = arg->cast_type;
				if (!abi_type) {
					abi_type = arg->type;
				}
				if (xt == abi_type) {
					array_add(&processed_args, x);
				} else {
					x.value = OdinLLVMBuildTransmute(p, x.value, abi_type);
					array_add(&processed_args, x);
				}

			} else if (arg->kind == lbArg_Indirect) {
				lbValue ptr = {};
				if (arg->is_byval) {
					ptr = lb_copy_value_to_ptr(p, x, original_type, arg->byval_alignment);
				} else if (is_calling_convention_odin(pt->Proc.calling_convention)) {
					// NOTE(bill): Odin parameters are immutable so the original value can be passed if possible
					// i.e. `T const &` in C++
					ptr = lb_address_from_load_or_generate_local(p, x);
				} else {
					ptr = lb_copy_value_to_ptr(p, x, original_type, 16);
				}
				array_add(&processed_args, ptr);
			}

			param_index += 1;
		}

		if (is_c_vararg) {
			for (isize i = processed_args.count; i < args.count; i++) {
				array_add(&processed_args, args[i]);
			}
		}

		if (inlining == ProcInlining_none) {
			inlining = p->inlining;
		}

		Type *rt = reduce_tuple_to_single_type(results);
		if (return_by_pointer) {
			lbValue return_ptr = {};
			if (use_copy_elision_hint && p->copy_elision_hint.ptr.value != nullptr) {
				if (are_types_identical(type_deref(p->copy_elision_hint.ptr.type), rt)) {
					return_ptr = lb_consume_copy_elision_hint(p);
				}
			}
			if (return_ptr.value == nullptr) {
				lbAddr r = lb_add_local_generated(p, rt, true);
				return_ptr = r.addr;
			}
			GB_ASSERT(is_type_pointer(return_ptr.type));
			lb_emit_call_internal(p, value, return_ptr, processed_args, nullptr, context_ptr, inlining);
			result = lb_emit_load(p, return_ptr);
		} else if (rt != nullptr) {
			result = lb_emit_call_internal(p, value, {}, processed_args, rt, context_ptr, inlining);
			if (ft->ret.cast_type) {
				result.value = OdinLLVMBuildTransmute(p, result.value, ft->ret.cast_type);
			}
			result.value = OdinLLVMBuildTransmute(p, result.value, ft->ret.type);
			result.type = rt;
			if (LLVMTypeOf(result.value) == LLVMInt1TypeInContext(p->module->ctx)) {
				result.type = t_llvm_bool;
			}
			if (!is_type_tuple(rt)) {
				result = lb_emit_conv(p, result, rt);
			}
		} else {
			lb_emit_call_internal(p, value, {}, processed_args, nullptr, context_ptr, inlining);
		}

	}

	Entity **found = map_get(&p->module->procedure_values, hash_pointer(value.value));
	if (found != nullptr) {
		Entity *e = *found;
		if (e != nullptr && entity_has_deferred_procedure(e)) {
			DeferredProcedureKind kind = e->Procedure.deferred_procedure.kind;
			Entity *deferred_entity = e->Procedure.deferred_procedure.entity;
			lbValue deferred = lb_find_procedure_value_from_entity(p->module, deferred_entity);


			auto in_args = args;
			Array<lbValue> result_as_args = {};
			switch (kind) {
			case DeferredProcedure_none:
				break;
			case DeferredProcedure_in:
				result_as_args = in_args;
				break;
			case DeferredProcedure_out:
				result_as_args = lb_value_to_array(p, result);
				break;
			case DeferredProcedure_in_out:
				{
					auto out_args = lb_value_to_array(p, result);
					array_init(&result_as_args, permanent_allocator(), in_args.count + out_args.count);
					array_copy(&result_as_args, in_args, 0);
					array_copy(&result_as_args, out_args, in_args.count);
				}
				break;
			}

			lb_add_defer_proc(p, p->scope_index, deferred, result_as_args);
		}
	}

	return result;
}


lbValue lb_build_builtin_proc(lbProcedure *p, Ast *expr, TypeAndValue const &tv, BuiltinProcId id) {
	ast_node(ce, CallExpr, expr);

	switch (id) {
	case BuiltinProc_DIRECTIVE: {
		ast_node(bd, BasicDirective, ce->proc);
		String name = bd->name.string;
		GB_ASSERT(name == "location");
		String procedure = p->entity->token.string;
		TokenPos pos = ast_token(ce->proc).pos;
		if (ce->args.count > 0) {
			Ast *ident = unselector_expr(ce->args[0]);
			GB_ASSERT(ident->kind == Ast_Ident);
			Entity *e = entity_of_node(ident);
			GB_ASSERT(e != nullptr);

			if (e->parent_proc_decl != nullptr && e->parent_proc_decl->entity != nullptr) {
				procedure = e->parent_proc_decl->entity->token.string;
			} else {
				procedure = str_lit("");
			}
			pos = e->token.pos;

		}
		return lb_emit_source_code_location(p, procedure, pos);
	}

	case BuiltinProc_type_info_of: {
		Ast *arg = ce->args[0];
		TypeAndValue tav = type_and_value_of_expr(arg);
		if (tav.mode == Addressing_Type) {
			Type *t = default_type(type_of_expr(arg));
			return lb_type_info(p->module, t);
		}
		GB_ASSERT(is_type_typeid(tav.type));

		auto args = array_make<lbValue>(permanent_allocator(), 1);
		args[0] = lb_build_expr(p, arg);
		return lb_emit_runtime_call(p, "__type_info_of", args);
	}

	case BuiltinProc_typeid_of: {
		Ast *arg = ce->args[0];
		TypeAndValue tav = type_and_value_of_expr(arg);
		GB_ASSERT(tav.mode == Addressing_Type);
		Type *t = default_type(type_of_expr(arg));
		return lb_typeid(p->module, t);
	}

	case BuiltinProc_len: {
		lbValue v = lb_build_expr(p, ce->args[0]);
		Type *t = base_type(v.type);
		if (is_type_pointer(t)) {
			// IMPORTANT TODO(bill): Should there be a nil pointer check?
			v = lb_emit_load(p, v);
			t = type_deref(t);
		}
		if (is_type_cstring(t)) {
			return lb_cstring_len(p, v);
		} else if (is_type_string(t)) {
			return lb_string_len(p, v);
		} else if (is_type_array(t)) {
			GB_PANIC("Array lengths are constant");
		} else if (is_type_slice(t)) {
			return lb_slice_len(p, v);
		} else if (is_type_dynamic_array(t)) {
			return lb_dynamic_array_len(p, v);
		} else if (is_type_map(t)) {
			return lb_map_len(p, v);
		} else if (is_type_soa_struct(t)) {
			return lb_soa_struct_len(p, v);
		}

		GB_PANIC("Unreachable");
		break;
	}

	case BuiltinProc_cap: {
		lbValue v = lb_build_expr(p, ce->args[0]);
		Type *t = base_type(v.type);
		if (is_type_pointer(t)) {
			// IMPORTANT TODO(bill): Should there be a nil pointer check?
			v = lb_emit_load(p, v);
			t = type_deref(t);
		}
		if (is_type_string(t)) {
			GB_PANIC("Unreachable");
		} else if (is_type_array(t)) {
			GB_PANIC("Array lengths are constant");
		} else if (is_type_slice(t)) {
			return lb_slice_len(p, v);
		} else if (is_type_dynamic_array(t)) {
			return lb_dynamic_array_cap(p, v);
		} else if (is_type_map(t)) {
			return lb_map_cap(p, v);
		} else if (is_type_soa_struct(t)) {
			return lb_soa_struct_cap(p, v);
		}

		GB_PANIC("Unreachable");

		break;
	}

	case BuiltinProc_swizzle: {
		isize index_count = ce->args.count-1;
		if (is_type_simd_vector(tv.type)) {
			lbValue vec = lb_build_expr(p, ce->args[0]);
			if (index_count == 0) {
				return vec;
			}

			unsigned mask_len = cast(unsigned)index_count;
			LLVMValueRef *mask_elems = gb_alloc_array(permanent_allocator(), LLVMValueRef, index_count);
			for (isize i = 1; i < ce->args.count; i++) {
				TypeAndValue tv = type_and_value_of_expr(ce->args[i]);
				GB_ASSERT(is_type_integer(tv.type));
				GB_ASSERT(tv.value.kind == ExactValue_Integer);

				u32 index = cast(u32)big_int_to_i64(&tv.value.value_integer);
				mask_elems[i-1] = LLVMConstInt(lb_type(p->module, t_u32), index, false);
			}

			LLVMValueRef mask = LLVMConstVector(mask_elems, mask_len);

			LLVMValueRef v1 = vec.value;
			LLVMValueRef v2 = vec.value;

			lbValue res = {};
			res.type = tv.type;
			res.value = LLVMBuildShuffleVector(p->builder, v1, v2, mask, "");
			return res;
		}

		lbAddr addr = lb_build_array_swizzle_addr(p, ce, tv);
		return lb_addr_load(p, addr);
	}

	case BuiltinProc_complex: {
		lbValue real = lb_build_expr(p, ce->args[0]);
		lbValue imag = lb_build_expr(p, ce->args[1]);
		lbAddr dst_addr = lb_add_local_generated(p, tv.type, false);
		lbValue dst = lb_addr_get_ptr(p, dst_addr);

		Type *ft = base_complex_elem_type(tv.type);
		real = lb_emit_conv(p, real, ft);
		imag = lb_emit_conv(p, imag, ft);
		lb_emit_store(p, lb_emit_struct_ep(p, dst, 0), real);
		lb_emit_store(p, lb_emit_struct_ep(p, dst, 1), imag);

		return lb_emit_load(p, dst);
	}

	case BuiltinProc_quaternion: {
		lbValue real = lb_build_expr(p, ce->args[0]);
		lbValue imag = lb_build_expr(p, ce->args[1]);
		lbValue jmag = lb_build_expr(p, ce->args[2]);
		lbValue kmag = lb_build_expr(p, ce->args[3]);

		// @QuaternionLayout
		lbAddr dst_addr = lb_add_local_generated(p, tv.type, false);
		lbValue dst = lb_addr_get_ptr(p, dst_addr);

		Type *ft = base_complex_elem_type(tv.type);
		real = lb_emit_conv(p, real, ft);
		imag = lb_emit_conv(p, imag, ft);
		jmag = lb_emit_conv(p, jmag, ft);
		kmag = lb_emit_conv(p, kmag, ft);
		lb_emit_store(p, lb_emit_struct_ep(p, dst, 3), real);
		lb_emit_store(p, lb_emit_struct_ep(p, dst, 0), imag);
		lb_emit_store(p, lb_emit_struct_ep(p, dst, 1), jmag);
		lb_emit_store(p, lb_emit_struct_ep(p, dst, 2), kmag);

		return lb_emit_load(p, dst);
	}

	case BuiltinProc_real: {
		lbValue val = lb_build_expr(p, ce->args[0]);
		if (is_type_complex(val.type)) {
			lbValue real = lb_emit_struct_ev(p, val, 0);
			return lb_emit_conv(p, real, tv.type);
		} else if (is_type_quaternion(val.type)) {
			// @QuaternionLayout
			lbValue real = lb_emit_struct_ev(p, val, 3);
			return lb_emit_conv(p, real, tv.type);
		}
		GB_PANIC("invalid type for real");
		return {};
	}
	case BuiltinProc_imag: {
		lbValue val = lb_build_expr(p, ce->args[0]);
		if (is_type_complex(val.type)) {
			lbValue imag = lb_emit_struct_ev(p, val, 1);
			return lb_emit_conv(p, imag, tv.type);
		} else if (is_type_quaternion(val.type)) {
			// @QuaternionLayout
			lbValue imag = lb_emit_struct_ev(p, val, 0);
			return lb_emit_conv(p, imag, tv.type);
		}
		GB_PANIC("invalid type for imag");
		return {};
	}
	case BuiltinProc_jmag: {
		lbValue val = lb_build_expr(p, ce->args[0]);
		if (is_type_quaternion(val.type)) {
			// @QuaternionLayout
			lbValue imag = lb_emit_struct_ev(p, val, 1);
			return lb_emit_conv(p, imag, tv.type);
		}
		GB_PANIC("invalid type for jmag");
		return {};
	}
	case BuiltinProc_kmag: {
		lbValue val = lb_build_expr(p, ce->args[0]);
		if (is_type_quaternion(val.type)) {
			// @QuaternionLayout
			lbValue imag = lb_emit_struct_ev(p, val, 2);
			return lb_emit_conv(p, imag, tv.type);
		}
		GB_PANIC("invalid type for kmag");
		return {};
	}

	case BuiltinProc_conj: {
		lbValue val = lb_build_expr(p, ce->args[0]);
		lbValue res = {};
		Type *t = val.type;
		if (is_type_complex(t)) {
			res = lb_addr_get_ptr(p, lb_add_local_generated(p, tv.type, false));
			lbValue real = lb_emit_struct_ev(p, val, 0);
			lbValue imag = lb_emit_struct_ev(p, val, 1);
			imag = lb_emit_unary_arith(p, Token_Sub, imag, imag.type);
			lb_emit_store(p, lb_emit_struct_ep(p, res, 0), real);
			lb_emit_store(p, lb_emit_struct_ep(p, res, 1), imag);
		} else if (is_type_quaternion(t)) {
			// @QuaternionLayout
			res = lb_addr_get_ptr(p, lb_add_local_generated(p, tv.type, false));
			lbValue real = lb_emit_struct_ev(p, val, 3);
			lbValue imag = lb_emit_struct_ev(p, val, 0);
			lbValue jmag = lb_emit_struct_ev(p, val, 1);
			lbValue kmag = lb_emit_struct_ev(p, val, 2);
			imag = lb_emit_unary_arith(p, Token_Sub, imag, imag.type);
			jmag = lb_emit_unary_arith(p, Token_Sub, jmag, jmag.type);
			kmag = lb_emit_unary_arith(p, Token_Sub, kmag, kmag.type);
			lb_emit_store(p, lb_emit_struct_ep(p, res, 3), real);
			lb_emit_store(p, lb_emit_struct_ep(p, res, 0), imag);
			lb_emit_store(p, lb_emit_struct_ep(p, res, 1), jmag);
			lb_emit_store(p, lb_emit_struct_ep(p, res, 2), kmag);
		}
		return lb_emit_load(p, res);
	}

	case BuiltinProc_expand_to_tuple: {
		lbValue val = lb_build_expr(p, ce->args[0]);
		Type *t = base_type(val.type);

		if (!is_type_tuple(tv.type)) {
			if (t->kind == Type_Struct) {
				GB_ASSERT(t->Struct.fields.count == 1);
				return lb_emit_struct_ev(p, val, 0);
			} else if (t->kind == Type_Array) {
				GB_ASSERT(t->Array.count == 1);
				return lb_emit_array_epi(p, val, 0);
			} else {
				GB_PANIC("Unknown type of expand_to_tuple");
			}

		}

		GB_ASSERT(is_type_tuple(tv.type));
		// NOTE(bill): Doesn't need to be zero because it will be initialized in the loops
		lbValue tuple = lb_addr_get_ptr(p, lb_add_local_generated(p, tv.type, false));
		if (t->kind == Type_Struct) {
			for_array(src_index, t->Struct.fields) {
				Entity *field = t->Struct.fields[src_index];
				i32 field_index = field->Variable.field_index;
				lbValue f = lb_emit_struct_ev(p, val, field_index);
				lbValue ep = lb_emit_struct_ep(p, tuple, cast(i32)src_index);
				lb_emit_store(p, ep, f);
			}
		} else if (is_type_array_like(t)) {
			// TODO(bill): Clean-up this code
			lbValue ap = lb_address_from_load_or_generate_local(p, val);
			i32 n = cast(i32)get_array_type_count(t);
			for (i32 i = 0; i < n; i++) {
				lbValue f = lb_emit_load(p, lb_emit_array_epi(p, ap, i));
				lbValue ep = lb_emit_struct_ep(p, tuple, i);
				lb_emit_store(p, ep, f);
			}
		} else {
			GB_PANIC("Unknown type of expand_to_tuple");
		}
		return lb_emit_load(p, tuple);
	}

	case BuiltinProc_min: {
		Type *t = type_of_expr(expr);
		if (ce->args.count == 2) {
			return lb_emit_min(p, t, lb_build_expr(p, ce->args[0]), lb_build_expr(p, ce->args[1]));
		} else {
			lbValue x = lb_build_expr(p, ce->args[0]);
			for (isize i = 1; i < ce->args.count; i++) {
				x = lb_emit_min(p, t, x, lb_build_expr(p, ce->args[i]));
			}
			return x;
		}
	}

	case BuiltinProc_max: {
		Type *t = type_of_expr(expr);
		if (ce->args.count == 2) {
			return lb_emit_max(p, t, lb_build_expr(p, ce->args[0]), lb_build_expr(p, ce->args[1]));
		} else {
			lbValue x = lb_build_expr(p, ce->args[0]);
			for (isize i = 1; i < ce->args.count; i++) {
				x = lb_emit_max(p, t, x, lb_build_expr(p, ce->args[i]));
			}
			return x;
		}
	}

	case BuiltinProc_abs: {
		lbValue x = lb_build_expr(p, ce->args[0]);
		Type *t = x.type;
		if (is_type_unsigned(t)) {
			return x;
		}
		if (is_type_quaternion(t)) {
			i64 sz = 8*type_size_of(t);
			auto args = array_make<lbValue>(permanent_allocator(), 1);
			args[0] = x;
			switch (sz) {
			case 64:  return lb_emit_runtime_call(p, "abs_quaternion64", args);
			case 128: return lb_emit_runtime_call(p, "abs_quaternion128", args);
			case 256: return lb_emit_runtime_call(p, "abs_quaternion256", args);
			}
			GB_PANIC("Unknown complex type");
		} else if (is_type_complex(t)) {
			i64 sz = 8*type_size_of(t);
			auto args = array_make<lbValue>(permanent_allocator(), 1);
			args[0] = x;
			switch (sz) {
			case 32:  return lb_emit_runtime_call(p, "abs_complex32",  args);
			case 64:  return lb_emit_runtime_call(p, "abs_complex64",  args);
			case 128: return lb_emit_runtime_call(p, "abs_complex128", args);
			}
			GB_PANIC("Unknown complex type");
		}
		lbValue zero = lb_const_nil(p->module, t);
		lbValue cond = lb_emit_comp(p, Token_Lt, x, zero);
		lbValue neg = lb_emit_unary_arith(p, Token_Sub, x, t);
		return lb_emit_select(p, cond, neg, x);
	}

	case BuiltinProc_clamp:
		return lb_emit_clamp(p, type_of_expr(expr),
		                     lb_build_expr(p, ce->args[0]),
		                     lb_build_expr(p, ce->args[1]),
		                     lb_build_expr(p, ce->args[2]));


	case BuiltinProc_soa_zip:
		return lb_soa_zip(p, ce, tv);
	case BuiltinProc_soa_unzip:
		return lb_soa_unzip(p, ce, tv);

	// "Intrinsics"

	case BuiltinProc_alloca:
		{
			lbValue sz = lb_build_expr(p, ce->args[0]);
			i64 al = exact_value_to_i64(type_and_value_of_expr(ce->args[1]).value);

			lbValue res = {};
			res.type = t_u8_ptr;
			res.value = LLVMBuildArrayAlloca(p->builder, lb_type(p->module, t_u8), sz.value, "");
			LLVMSetAlignment(res.value, cast(unsigned)al);
			return res;
		}

	case BuiltinProc_cpu_relax:
		if (build_context.metrics.arch == TargetArch_386 ||
		    build_context.metrics.arch == TargetArch_amd64) {
			LLVMTypeRef func_type = LLVMFunctionType(LLVMVoidTypeInContext(p->module->ctx), nullptr, 0, false);
			LLVMValueRef the_asm = LLVMGetInlineAsm(func_type,
				cast(char *)"pause", 5,
				cast(char *)"", 0,
				/*HasSideEffects*/true, /*IsAlignStack*/false,
				LLVMInlineAsmDialectATT
			);
			GB_ASSERT(the_asm != nullptr);
			LLVMBuildCall2(p->builder, func_type, the_asm, nullptr, 0, "");
		} else if (build_context.metrics.arch == TargetArch_arm64) {
			LLVMTypeRef func_type = LLVMFunctionType(LLVMVoidTypeInContext(p->module->ctx), nullptr, 0, false);
			LLVMValueRef the_asm = LLVMGetInlineAsm(func_type,
				cast(char *)"yield", 5,
				cast(char *)"", 0,
				/*HasSideEffects*/true, /*IsAlignStack*/false,
				LLVMInlineAsmDialectATT
			);
			GB_ASSERT(the_asm != nullptr);
			LLVMBuildCall2(p->builder, func_type, the_asm, nullptr, 0, "");
		}
		return {};


	case BuiltinProc_debug_trap:
	case BuiltinProc_trap:
		{
			char const *name = nullptr;
			switch (id) {
			case BuiltinProc_debug_trap: name = "llvm.debugtrap"; break;
			case BuiltinProc_trap:       name = "llvm.trap";      break;
			}

			unsigned id = LLVMLookupIntrinsicID(name, gb_strlen(name));
			GB_ASSERT_MSG(id != 0, "Unable to find %s", name);
			LLVMValueRef ip = LLVMGetIntrinsicDeclaration(p->module->mod, id, nullptr, 0);

			LLVMBuildCall(p->builder, ip, nullptr, 0, "");
			if (id == BuiltinProc_trap) {
				LLVMBuildUnreachable(p->builder);
			}
			return {};
		}

	case BuiltinProc_read_cycle_counter:
		{
			char const *name = "llvm.readcyclecounter";
			unsigned id = LLVMLookupIntrinsicID(name, gb_strlen(name));
			GB_ASSERT_MSG(id != 0, "Unable to find %s", name);
			LLVMValueRef ip = LLVMGetIntrinsicDeclaration(p->module->mod, id, nullptr, 0);

			lbValue res = {};
			res.value = LLVMBuildCall(p->builder, ip, nullptr, 0, "");
			res.type = tv.type;
			return res;
		}

	case BuiltinProc_count_trailing_zeros:
		return lb_emit_count_trailing_zeros(p, lb_build_expr(p, ce->args[0]), tv.type);
	case BuiltinProc_count_leading_zeros:
		return lb_emit_count_leading_zeros(p, lb_build_expr(p, ce->args[0]), tv.type);

	case BuiltinProc_count_ones:
		return lb_emit_count_ones(p, lb_build_expr(p, ce->args[0]), tv.type);
	case BuiltinProc_count_zeros:
		return lb_emit_count_zeros(p, lb_build_expr(p, ce->args[0]), tv.type);

	case BuiltinProc_reverse_bits:
		return lb_emit_reverse_bits(p, lb_build_expr(p, ce->args[0]), tv.type);

	case BuiltinProc_byte_swap:
		{
			lbValue x = lb_build_expr(p, ce->args[0]);
			x = lb_emit_conv(p, x, tv.type);
			return lb_emit_byte_swap(p, x, tv.type);
		}

	case BuiltinProc_overflow_add:
	case BuiltinProc_overflow_sub:
	case BuiltinProc_overflow_mul:
		{
			Type *main_type = tv.type;
			Type *type = main_type;
			if (is_type_tuple(main_type)) {
				type = main_type->Tuple.variables[0]->type;
			}

			lbValue x = lb_build_expr(p, ce->args[0]);
			lbValue y = lb_build_expr(p, ce->args[1]);
			x = lb_emit_conv(p, x, type);
			y = lb_emit_conv(p, y, type);

			char const *name = nullptr;
			if (is_type_unsigned(type)) {
				switch (id) {
				case BuiltinProc_overflow_add: name = "llvm.uadd.with.overflow"; break;
				case BuiltinProc_overflow_sub: name = "llvm.usub.with.overflow"; break;
				case BuiltinProc_overflow_mul: name = "llvm.umul.with.overflow"; break;
				}
			} else {
				switch (id) {
				case BuiltinProc_overflow_add: name = "llvm.sadd.with.overflow"; break;
				case BuiltinProc_overflow_sub: name = "llvm.ssub.with.overflow"; break;
				case BuiltinProc_overflow_mul: name = "llvm.smul.with.overflow"; break;
				}
			}
			LLVMTypeRef types[1] = {lb_type(p->module, type)};
			unsigned id = LLVMLookupIntrinsicID(name, gb_strlen(name));
			GB_ASSERT_MSG(id != 0, "Unable to find %s.%s", name, LLVMPrintTypeToString(types[0]));
			LLVMValueRef ip = LLVMGetIntrinsicDeclaration(p->module->mod, id, types, gb_count_of(types));

			LLVMValueRef args[2] = {};
			args[0] = x.value;
			args[1] = y.value;

			lbValue res = {};
			res.value = LLVMBuildCall(p->builder, ip, args, gb_count_of(args), "");

			if (is_type_tuple(main_type)) {
				Type *res_type = nullptr;
				gbAllocator a = permanent_allocator();
				res_type = alloc_type_tuple();
				slice_init(&res_type->Tuple.variables, a, 2);
				res_type->Tuple.variables[0] = alloc_entity_field(nullptr, blank_token, type,        false, 0);
				res_type->Tuple.variables[1] = alloc_entity_field(nullptr, blank_token, t_llvm_bool, false, 1);

				res.type = res_type;
			} else {
				res.value = LLVMBuildExtractValue(p->builder, res.value, 0, "");
				res.type = type;
			}
			return res;
		}

	case BuiltinProc_sqrt:
		{
			Type *type = tv.type;

			lbValue x = lb_build_expr(p, ce->args[0]);
			x = lb_emit_conv(p, x, type);

			char const *name = "llvm.sqrt";
			LLVMTypeRef types[1] = {lb_type(p->module, type)};
			unsigned id = LLVMLookupIntrinsicID(name, gb_strlen(name));
			GB_ASSERT_MSG(id != 0, "Unable to find %s.%s", name, LLVMPrintTypeToString(types[0]));
			LLVMValueRef ip = LLVMGetIntrinsicDeclaration(p->module->mod, id, types, gb_count_of(types));

			LLVMValueRef args[1] = {};
			args[0] = x.value;

			lbValue res = {};
			res.value = LLVMBuildCall(p->builder, ip, args, gb_count_of(args), "");
			res.type = type;
			return res;
		}

	case BuiltinProc_mem_copy:
	case BuiltinProc_mem_copy_non_overlapping:
		{
			lbValue dst = lb_build_expr(p, ce->args[0]);
			lbValue src = lb_build_expr(p, ce->args[1]);
			lbValue len = lb_build_expr(p, ce->args[2]);
			dst = lb_emit_conv(p, dst, t_rawptr);
			src = lb_emit_conv(p, src, t_rawptr);
			len = lb_emit_conv(p, len, t_int);

			bool is_inlinable = false;

			if (ce->args[2]->tav.mode == Addressing_Constant) {
				ExactValue ev = exact_value_to_integer(ce->args[2]->tav.value);
				i64 const_len = exact_value_to_i64(ev);
				// TODO(bill): Determine when it is better to do the `*.inline` versions
				if (const_len <= 4*build_context.word_size) {
					is_inlinable = true;
				}
			}

			char const *name = nullptr;
			switch (id) {
			case BuiltinProc_mem_copy:
				if (is_inlinable) {
					name = "llvm.memmove.inline";
				} else {
					name = "llvm.memmove";
				}
				break;
			case BuiltinProc_mem_copy_non_overlapping:
				if (is_inlinable) {
					name = "llvm.memcpy.line";
				} else {
					name = "llvm.memcpy";
				}
				break;
			}

			LLVMTypeRef types[3] = {
				lb_type(p->module, t_rawptr),
				lb_type(p->module, t_rawptr),
				lb_type(p->module, t_int)
			};
			unsigned id = LLVMLookupIntrinsicID(name, gb_strlen(name));
			GB_ASSERT_MSG(id != 0, "Unable to find %s.%s.%s.%s", name, LLVMPrintTypeToString(types[0]), LLVMPrintTypeToString(types[1]), LLVMPrintTypeToString(types[2]));
			LLVMValueRef ip = LLVMGetIntrinsicDeclaration(p->module->mod, id, types, gb_count_of(types));

			LLVMValueRef args[4] = {};
			args[0] = dst.value;
			args[1] = src.value;
			args[2] = len.value;
			args[3] = LLVMConstInt(LLVMInt1TypeInContext(p->module->ctx), 0, false); // is_volatile parameter

			LLVMBuildCall(p->builder, ip, args, gb_count_of(args), "");

			return {};
		}

	case BuiltinProc_mem_zero:
		{
			lbValue ptr = lb_build_expr(p, ce->args[0]);
			lbValue len = lb_build_expr(p, ce->args[1]);
			ptr = lb_emit_conv(p, ptr, t_rawptr);
			len = lb_emit_conv(p, len, t_int);

			unsigned alignment = 1;
			lb_mem_zero_ptr_internal(p, ptr.value, len.value, alignment);
			return {};
		}

	case BuiltinProc_ptr_offset:
		{
			lbValue ptr = lb_build_expr(p, ce->args[0]);
			lbValue len = lb_build_expr(p, ce->args[1]);
			len = lb_emit_conv(p, len, t_int);

			LLVMValueRef indices[1] = {
				len.value,
			};

			lbValue res = {};
			res.type = tv.type;
			res.value = LLVMBuildGEP(p->builder, ptr.value, indices, gb_count_of(indices), "");
			return res;
		}
	case BuiltinProc_ptr_sub:
		{
			lbValue ptr0 = lb_build_expr(p, ce->args[0]);
			lbValue ptr1 = lb_build_expr(p, ce->args[1]);

			LLVMTypeRef type_int = lb_type(p->module, t_int);
			LLVMValueRef diff = LLVMBuildPtrDiff(p->builder, ptr0.value, ptr1.value, "");
			diff = LLVMBuildIntCast2(p->builder, diff, type_int, /*signed*/true, "");

			lbValue res = {};
			res.type = t_int;
			res.value = diff;
			return res;
		}



	case BuiltinProc_atomic_fence:
		LLVMBuildFence(p->builder, LLVMAtomicOrderingSequentiallyConsistent, false, "");
		return {};
	case BuiltinProc_atomic_fence_acq:
		LLVMBuildFence(p->builder, LLVMAtomicOrderingAcquire, false, "");
		return {};
	case BuiltinProc_atomic_fence_rel:
		LLVMBuildFence(p->builder, LLVMAtomicOrderingRelease, false, "");
		return {};
	case BuiltinProc_atomic_fence_acqrel:
		LLVMBuildFence(p->builder, LLVMAtomicOrderingAcquireRelease, false, "");
		return {};

	case BuiltinProc_volatile_store:
	case BuiltinProc_atomic_store:
	case BuiltinProc_atomic_store_rel:
	case BuiltinProc_atomic_store_relaxed:
	case BuiltinProc_atomic_store_unordered: {
		lbValue dst = lb_build_expr(p, ce->args[0]);
		lbValue val = lb_build_expr(p, ce->args[1]);
		val = lb_emit_conv(p, val, type_deref(dst.type));

		LLVMValueRef instr = LLVMBuildStore(p->builder, val.value, dst.value);
		switch (id) {
		case BuiltinProc_volatile_store:         LLVMSetVolatile(instr, true);                                     break;
		case BuiltinProc_atomic_store:           LLVMSetOrdering(instr, LLVMAtomicOrderingSequentiallyConsistent); break;
		case BuiltinProc_atomic_store_rel:       LLVMSetOrdering(instr, LLVMAtomicOrderingRelease);                break;
		case BuiltinProc_atomic_store_relaxed:   LLVMSetOrdering(instr, LLVMAtomicOrderingMonotonic);              break;
		case BuiltinProc_atomic_store_unordered: LLVMSetOrdering(instr, LLVMAtomicOrderingUnordered);              break;
		}

		LLVMSetAlignment(instr, cast(unsigned)type_align_of(type_deref(dst.type)));

		return {};
	}

	case BuiltinProc_volatile_load:
	case BuiltinProc_atomic_load:
	case BuiltinProc_atomic_load_acq:
	case BuiltinProc_atomic_load_relaxed:
	case BuiltinProc_atomic_load_unordered: {
		lbValue dst = lb_build_expr(p, ce->args[0]);

		LLVMValueRef instr = LLVMBuildLoad(p->builder, dst.value, "");
		switch (id) {
		case BuiltinProc_volatile_load:         LLVMSetVolatile(instr, true);                                     break;
		case BuiltinProc_atomic_load:           LLVMSetOrdering(instr, LLVMAtomicOrderingSequentiallyConsistent); break;
		case BuiltinProc_atomic_load_acq:       LLVMSetOrdering(instr, LLVMAtomicOrderingAcquire);                break;
		case BuiltinProc_atomic_load_relaxed:   LLVMSetOrdering(instr, LLVMAtomicOrderingMonotonic);              break;
		case BuiltinProc_atomic_load_unordered: LLVMSetOrdering(instr, LLVMAtomicOrderingUnordered);              break;
		}
		LLVMSetAlignment(instr, cast(unsigned)type_align_of(type_deref(dst.type)));

		lbValue res = {};
		res.value = instr;
		res.type = type_deref(dst.type);
		return res;
	}

	case BuiltinProc_atomic_add:
	case BuiltinProc_atomic_add_acq:
	case BuiltinProc_atomic_add_rel:
	case BuiltinProc_atomic_add_acqrel:
	case BuiltinProc_atomic_add_relaxed:
	case BuiltinProc_atomic_sub:
	case BuiltinProc_atomic_sub_acq:
	case BuiltinProc_atomic_sub_rel:
	case BuiltinProc_atomic_sub_acqrel:
	case BuiltinProc_atomic_sub_relaxed:
	case BuiltinProc_atomic_and:
	case BuiltinProc_atomic_and_acq:
	case BuiltinProc_atomic_and_rel:
	case BuiltinProc_atomic_and_acqrel:
	case BuiltinProc_atomic_and_relaxed:
	case BuiltinProc_atomic_nand:
	case BuiltinProc_atomic_nand_acq:
	case BuiltinProc_atomic_nand_rel:
	case BuiltinProc_atomic_nand_acqrel:
	case BuiltinProc_atomic_nand_relaxed:
	case BuiltinProc_atomic_or:
	case BuiltinProc_atomic_or_acq:
	case BuiltinProc_atomic_or_rel:
	case BuiltinProc_atomic_or_acqrel:
	case BuiltinProc_atomic_or_relaxed:
	case BuiltinProc_atomic_xor:
	case BuiltinProc_atomic_xor_acq:
	case BuiltinProc_atomic_xor_rel:
	case BuiltinProc_atomic_xor_acqrel:
	case BuiltinProc_atomic_xor_relaxed:
	case BuiltinProc_atomic_xchg:
	case BuiltinProc_atomic_xchg_acq:
	case BuiltinProc_atomic_xchg_rel:
	case BuiltinProc_atomic_xchg_acqrel:
	case BuiltinProc_atomic_xchg_relaxed: {
		lbValue dst = lb_build_expr(p, ce->args[0]);
		lbValue val = lb_build_expr(p, ce->args[1]);
		val = lb_emit_conv(p, val, type_deref(dst.type));

		LLVMAtomicRMWBinOp op = {};
		LLVMAtomicOrdering ordering = {};

		switch (id) {
		case BuiltinProc_atomic_add:          op = LLVMAtomicRMWBinOpAdd;  ordering = LLVMAtomicOrderingSequentiallyConsistent; break;
		case BuiltinProc_atomic_add_acq:      op = LLVMAtomicRMWBinOpAdd;  ordering = LLVMAtomicOrderingAcquire; break;
		case BuiltinProc_atomic_add_rel:      op = LLVMAtomicRMWBinOpAdd;  ordering = LLVMAtomicOrderingRelease; break;
		case BuiltinProc_atomic_add_acqrel:   op = LLVMAtomicRMWBinOpAdd;  ordering = LLVMAtomicOrderingAcquireRelease; break;
		case BuiltinProc_atomic_add_relaxed:  op = LLVMAtomicRMWBinOpAdd;  ordering = LLVMAtomicOrderingMonotonic; break;
		case BuiltinProc_atomic_sub:          op = LLVMAtomicRMWBinOpSub;  ordering = LLVMAtomicOrderingSequentiallyConsistent; break;
		case BuiltinProc_atomic_sub_acq:      op = LLVMAtomicRMWBinOpSub;  ordering = LLVMAtomicOrderingAcquire; break;
		case BuiltinProc_atomic_sub_rel:      op = LLVMAtomicRMWBinOpSub;  ordering = LLVMAtomicOrderingRelease; break;
		case BuiltinProc_atomic_sub_acqrel:   op = LLVMAtomicRMWBinOpSub;  ordering = LLVMAtomicOrderingAcquireRelease; break;
		case BuiltinProc_atomic_sub_relaxed:  op = LLVMAtomicRMWBinOpSub;  ordering = LLVMAtomicOrderingMonotonic; break;
		case BuiltinProc_atomic_and:          op = LLVMAtomicRMWBinOpAnd;  ordering = LLVMAtomicOrderingSequentiallyConsistent; break;
		case BuiltinProc_atomic_and_acq:      op = LLVMAtomicRMWBinOpAnd;  ordering = LLVMAtomicOrderingAcquire; break;
		case BuiltinProc_atomic_and_rel:      op = LLVMAtomicRMWBinOpAnd;  ordering = LLVMAtomicOrderingRelease; break;
		case BuiltinProc_atomic_and_acqrel:   op = LLVMAtomicRMWBinOpAnd;  ordering = LLVMAtomicOrderingAcquireRelease; break;
		case BuiltinProc_atomic_and_relaxed:  op = LLVMAtomicRMWBinOpAnd;  ordering = LLVMAtomicOrderingMonotonic; break;
		case BuiltinProc_atomic_nand:         op = LLVMAtomicRMWBinOpNand; ordering = LLVMAtomicOrderingSequentiallyConsistent; break;
		case BuiltinProc_atomic_nand_acq:     op = LLVMAtomicRMWBinOpNand; ordering = LLVMAtomicOrderingAcquire; break;
		case BuiltinProc_atomic_nand_rel:     op = LLVMAtomicRMWBinOpNand; ordering = LLVMAtomicOrderingRelease; break;
		case BuiltinProc_atomic_nand_acqrel:  op = LLVMAtomicRMWBinOpNand; ordering = LLVMAtomicOrderingAcquireRelease; break;
		case BuiltinProc_atomic_nand_relaxed: op = LLVMAtomicRMWBinOpNand; ordering = LLVMAtomicOrderingMonotonic; break;
		case BuiltinProc_atomic_or:           op = LLVMAtomicRMWBinOpOr;   ordering = LLVMAtomicOrderingSequentiallyConsistent; break;
		case BuiltinProc_atomic_or_acq:       op = LLVMAtomicRMWBinOpOr;   ordering = LLVMAtomicOrderingAcquire; break;
		case BuiltinProc_atomic_or_rel:       op = LLVMAtomicRMWBinOpOr;   ordering = LLVMAtomicOrderingRelease; break;
		case BuiltinProc_atomic_or_acqrel:    op = LLVMAtomicRMWBinOpOr;   ordering = LLVMAtomicOrderingAcquireRelease; break;
		case BuiltinProc_atomic_or_relaxed:   op = LLVMAtomicRMWBinOpOr;   ordering = LLVMAtomicOrderingMonotonic; break;
		case BuiltinProc_atomic_xor:          op = LLVMAtomicRMWBinOpXor;  ordering = LLVMAtomicOrderingSequentiallyConsistent; break;
		case BuiltinProc_atomic_xor_acq:      op = LLVMAtomicRMWBinOpXor;  ordering = LLVMAtomicOrderingAcquire; break;
		case BuiltinProc_atomic_xor_rel:      op = LLVMAtomicRMWBinOpXor;  ordering = LLVMAtomicOrderingRelease; break;
		case BuiltinProc_atomic_xor_acqrel:   op = LLVMAtomicRMWBinOpXor;  ordering = LLVMAtomicOrderingAcquireRelease; break;
		case BuiltinProc_atomic_xor_relaxed:  op = LLVMAtomicRMWBinOpXor;  ordering = LLVMAtomicOrderingMonotonic; break;
		case BuiltinProc_atomic_xchg:         op = LLVMAtomicRMWBinOpXchg; ordering = LLVMAtomicOrderingSequentiallyConsistent; break;
		case BuiltinProc_atomic_xchg_acq:     op = LLVMAtomicRMWBinOpXchg; ordering = LLVMAtomicOrderingAcquire; break;
		case BuiltinProc_atomic_xchg_rel:     op = LLVMAtomicRMWBinOpXchg; ordering = LLVMAtomicOrderingRelease; break;
		case BuiltinProc_atomic_xchg_acqrel:  op = LLVMAtomicRMWBinOpXchg; ordering = LLVMAtomicOrderingAcquireRelease; break;
		case BuiltinProc_atomic_xchg_relaxed: op = LLVMAtomicRMWBinOpXchg; ordering = LLVMAtomicOrderingMonotonic; break;
		}

		lbValue res = {};
		res.value = LLVMBuildAtomicRMW(p->builder, op, dst.value, val.value, ordering, false);
		res.type = tv.type;
		return res;
	}

	case BuiltinProc_atomic_cxchg:
	case BuiltinProc_atomic_cxchg_acq:
	case BuiltinProc_atomic_cxchg_rel:
	case BuiltinProc_atomic_cxchg_acqrel:
	case BuiltinProc_atomic_cxchg_relaxed:
	case BuiltinProc_atomic_cxchg_failrelaxed:
	case BuiltinProc_atomic_cxchg_failacq:
	case BuiltinProc_atomic_cxchg_acq_failrelaxed:
	case BuiltinProc_atomic_cxchg_acqrel_failrelaxed:
	case BuiltinProc_atomic_cxchgweak:
	case BuiltinProc_atomic_cxchgweak_acq:
	case BuiltinProc_atomic_cxchgweak_rel:
	case BuiltinProc_atomic_cxchgweak_acqrel:
	case BuiltinProc_atomic_cxchgweak_relaxed:
	case BuiltinProc_atomic_cxchgweak_failrelaxed:
	case BuiltinProc_atomic_cxchgweak_failacq:
	case BuiltinProc_atomic_cxchgweak_acq_failrelaxed:
	case BuiltinProc_atomic_cxchgweak_acqrel_failrelaxed: {
		lbValue address = lb_build_expr(p, ce->args[0]);
		Type *elem = type_deref(address.type);
		lbValue old_value = lb_build_expr(p, ce->args[1]);
		lbValue new_value = lb_build_expr(p, ce->args[2]);
		old_value = lb_emit_conv(p, old_value, elem);
		new_value = lb_emit_conv(p, new_value, elem);

		LLVMAtomicOrdering success_ordering = {};
		LLVMAtomicOrdering failure_ordering = {};
		LLVMBool weak = false;

		switch (id) {
		case BuiltinProc_atomic_cxchg:                        success_ordering = LLVMAtomicOrderingSequentiallyConsistent; failure_ordering = LLVMAtomicOrderingSequentiallyConsistent; weak = false; break;
		case BuiltinProc_atomic_cxchg_acq:                    success_ordering = LLVMAtomicOrderingAcquire;                failure_ordering = LLVMAtomicOrderingSequentiallyConsistent; weak = false; break;
		case BuiltinProc_atomic_cxchg_rel:                    success_ordering = LLVMAtomicOrderingRelease;                failure_ordering = LLVMAtomicOrderingSequentiallyConsistent; weak = false; break;
		case BuiltinProc_atomic_cxchg_acqrel:                 success_ordering = LLVMAtomicOrderingAcquireRelease;         failure_ordering = LLVMAtomicOrderingSequentiallyConsistent; weak = false; break;
		case BuiltinProc_atomic_cxchg_relaxed:                success_ordering = LLVMAtomicOrderingMonotonic;              failure_ordering = LLVMAtomicOrderingMonotonic;              weak = false; break;
		case BuiltinProc_atomic_cxchg_failrelaxed:            success_ordering = LLVMAtomicOrderingSequentiallyConsistent; failure_ordering = LLVMAtomicOrderingMonotonic;              weak = false; break;
		case BuiltinProc_atomic_cxchg_failacq:                success_ordering = LLVMAtomicOrderingSequentiallyConsistent; failure_ordering = LLVMAtomicOrderingAcquire;                weak = false; break;
		case BuiltinProc_atomic_cxchg_acq_failrelaxed:        success_ordering = LLVMAtomicOrderingAcquire;                failure_ordering = LLVMAtomicOrderingMonotonic;              weak = false; break;
		case BuiltinProc_atomic_cxchg_acqrel_failrelaxed:     success_ordering = LLVMAtomicOrderingAcquireRelease;         failure_ordering = LLVMAtomicOrderingMonotonic;              weak = false; break;
		case BuiltinProc_atomic_cxchgweak:                    success_ordering = LLVMAtomicOrderingSequentiallyConsistent; failure_ordering = LLVMAtomicOrderingSequentiallyConsistent; weak = false; break;
		case BuiltinProc_atomic_cxchgweak_acq:                success_ordering = LLVMAtomicOrderingAcquire;                failure_ordering = LLVMAtomicOrderingSequentiallyConsistent; weak = true;  break;
		case BuiltinProc_atomic_cxchgweak_rel:                success_ordering = LLVMAtomicOrderingRelease;                failure_ordering = LLVMAtomicOrderingSequentiallyConsistent; weak = true;  break;
		case BuiltinProc_atomic_cxchgweak_acqrel:             success_ordering = LLVMAtomicOrderingAcquireRelease;         failure_ordering = LLVMAtomicOrderingSequentiallyConsistent; weak = true;  break;
		case BuiltinProc_atomic_cxchgweak_relaxed:            success_ordering = LLVMAtomicOrderingMonotonic;              failure_ordering = LLVMAtomicOrderingMonotonic;              weak = true;  break;
		case BuiltinProc_atomic_cxchgweak_failrelaxed:        success_ordering = LLVMAtomicOrderingSequentiallyConsistent; failure_ordering = LLVMAtomicOrderingMonotonic;              weak = true;  break;
		case BuiltinProc_atomic_cxchgweak_failacq:            success_ordering = LLVMAtomicOrderingSequentiallyConsistent; failure_ordering = LLVMAtomicOrderingAcquire;                weak = true;  break;
		case BuiltinProc_atomic_cxchgweak_acq_failrelaxed:    success_ordering = LLVMAtomicOrderingAcquire;                failure_ordering = LLVMAtomicOrderingMonotonic;              weak = true;  break;
		case BuiltinProc_atomic_cxchgweak_acqrel_failrelaxed: success_ordering = LLVMAtomicOrderingAcquireRelease;         failure_ordering = LLVMAtomicOrderingMonotonic;              weak = true;  break;
		}

		// TODO(bill): Figure out how to make it weak
		LLVMBool single_threaded = weak;

		LLVMValueRef value = LLVMBuildAtomicCmpXchg(
			p->builder, address.value,
			old_value.value, new_value.value,
			success_ordering,
			failure_ordering,
			single_threaded
		);

		if (tv.type->kind == Type_Tuple) {
			Type *fix_typed = alloc_type_tuple();
			slice_init(&fix_typed->Tuple.variables, permanent_allocator(), 2);
			fix_typed->Tuple.variables[0] = tv.type->Tuple.variables[0];
			fix_typed->Tuple.variables[1] = alloc_entity_field(nullptr, blank_token, t_llvm_bool, false, 1);

			lbValue res = {};
			res.value = value;
			res.type = fix_typed;
			return res;
		} else {
			lbValue res = {};
			res.value = LLVMBuildExtractValue(p->builder, value, 0, "");
			res.type = tv.type;
			return res;
		}
	}


	case BuiltinProc_type_equal_proc:
		return lb_get_equal_proc_for_type(p->module, ce->args[0]->tav.type);

	case BuiltinProc_type_hasher_proc:
		return lb_get_hasher_proc_for_type(p->module, ce->args[0]->tav.type);

	case BuiltinProc_fixed_point_mul:
	case BuiltinProc_fixed_point_div:
	case BuiltinProc_fixed_point_mul_sat:
	case BuiltinProc_fixed_point_div_sat:
		{
			Type *platform_type = integer_endian_type_to_platform_type(tv.type);

			lbValue x     = lb_emit_conv(p, lb_build_expr(p, ce->args[0]), platform_type);
			lbValue y     = lb_emit_conv(p, lb_build_expr(p, ce->args[1]), platform_type);
			lbValue scale = lb_emit_conv(p, lb_build_expr(p, ce->args[2]), t_i32);

			char const *name = nullptr;
			if (is_type_unsigned(tv.type)) {
				switch (id) {
				case BuiltinProc_fixed_point_mul:     name = "llvm.umul.fix";     break;
				case BuiltinProc_fixed_point_div:     name = "llvm.udiv.fix";     break;
				case BuiltinProc_fixed_point_mul_sat: name = "llvm.umul.fix.sat"; break;
				case BuiltinProc_fixed_point_div_sat: name = "llvm.udiv.fix.sat"; break;
				}
			} else {
				switch (id) {
				case BuiltinProc_fixed_point_mul:     name = "llvm.smul.fix";     break;
				case BuiltinProc_fixed_point_div:     name = "llvm.sdiv.fix";     break;
				case BuiltinProc_fixed_point_mul_sat: name = "llvm.smul.fix.sat"; break;
				case BuiltinProc_fixed_point_div_sat: name = "llvm.sdiv.fix.sat"; break;
				}
			}
			GB_ASSERT(name != nullptr);

			LLVMTypeRef types[1] = {lb_type(p->module, platform_type)};
			unsigned id = LLVMLookupIntrinsicID(name, gb_strlen(name));
			GB_ASSERT_MSG(id != 0, "Unable to find %s.%s", name, LLVMPrintTypeToString(types[0]));
			LLVMValueRef ip = LLVMGetIntrinsicDeclaration(p->module->mod, id, types, gb_count_of(types));

			lbValue res = {};

			LLVMValueRef args[3] = {};
			args[0] = x.value;
			args[1] = y.value;
			args[2] = scale.value;

			res.value = LLVMBuildCall(p->builder, ip, args, gb_count_of(args), "");
			res.type = platform_type;
			return lb_emit_conv(p, res, tv.type);
		}

	case BuiltinProc_expect:
		{
			Type *t = default_type(tv.type);
			lbValue x = lb_emit_conv(p, lb_build_expr(p, ce->args[0]), t);
			lbValue y = lb_emit_conv(p, lb_build_expr(p, ce->args[1]), t);

			char const *name = "llvm.expect";

			LLVMTypeRef types[1] = {lb_type(p->module, t)};
			unsigned id = LLVMLookupIntrinsicID(name, gb_strlen(name));
			GB_ASSERT_MSG(id != 0, "Unable to find %s.%s", name, LLVMPrintTypeToString(types[0]));
			LLVMValueRef ip = LLVMGetIntrinsicDeclaration(p->module->mod, id, types, gb_count_of(types));

			lbValue res = {};

			LLVMValueRef args[2] = {};
			args[0] = x.value;
			args[1] = y.value;

			res.value = LLVMBuildCall(p->builder, ip, args, gb_count_of(args), "");
			res.type = t;
			return lb_emit_conv(p, res, t);
		}
		
	case BuiltinProc_prefetch_read_instruction:
	case BuiltinProc_prefetch_read_data:
	case BuiltinProc_prefetch_write_instruction:
	case BuiltinProc_prefetch_write_data:
		{
			lbValue ptr = lb_emit_conv(p, lb_build_expr(p, ce->args[0]), t_rawptr);
			unsigned long long locality = cast(unsigned long long)exact_value_to_i64(ce->args[1]->tav.value);
			unsigned long long rw = 0;
			unsigned long long cache = 0;
			switch (id) {
			case BuiltinProc_prefetch_read_instruction:
				rw = 0;
				cache = 0;
				break;
			case BuiltinProc_prefetch_read_data:
				rw = 0;
				cache = 1;
				break;
			case BuiltinProc_prefetch_write_instruction:
				rw = 1;
				cache = 0;
				break;
			case BuiltinProc_prefetch_write_data:
				rw = 1;
				cache = 1;
				break;
			}
			
			char const *name = "llvm.prefetch";
			
			LLVMTypeRef types[1] = {lb_type(p->module, t_rawptr)};
			unsigned id = LLVMLookupIntrinsicID(name, gb_strlen(name));
			GB_ASSERT_MSG(id != 0, "Unable to find %s.%s", name, LLVMPrintTypeToString(types[0]));
			LLVMValueRef ip = LLVMGetIntrinsicDeclaration(p->module->mod, id, types, gb_count_of(types));
			
			LLVMTypeRef llvm_i32 = lb_type(p->module, t_i32);
			LLVMValueRef args[4] = {};
			args[0] = ptr.value;
			args[1] = LLVMConstInt(llvm_i32, rw, false);
			args[2] = LLVMConstInt(llvm_i32, locality, false);
			args[3] = LLVMConstInt(llvm_i32, cache, false);
			
			lbValue res = {};
			res.value = LLVMBuildCall(p->builder, ip, args, gb_count_of(args), "");
			res.type = nullptr;
			return res;
		}
		
	case BuiltinProc_syscall:
		{
			unsigned arg_count = cast(unsigned)ce->args.count;
			LLVMValueRef *args = gb_alloc_array(permanent_allocator(), LLVMValueRef, arg_count);
			for_array(i, ce->args) {
				lbValue arg = lb_build_expr(p, ce->args[i]);
				arg = lb_emit_conv(p, arg, t_uintptr);
				args[i] = arg.value;
			}
			
			LLVMTypeRef llvm_uintptr = lb_type(p->module, t_uintptr);
			LLVMTypeRef *llvm_arg_types = gb_alloc_array(permanent_allocator(), LLVMTypeRef, arg_count);
			for (unsigned i = 0; i < arg_count; i++) {
				llvm_arg_types[i] = llvm_uintptr;
			}
			
			LLVMTypeRef func_type = LLVMFunctionType(llvm_uintptr, llvm_arg_types, arg_count, false);
			
			LLVMValueRef inline_asm = nullptr;
			
			switch (build_context.metrics.arch) {
			case TargetArch_amd64:
				{
					GB_ASSERT(arg_count <= 7);
					
					char asm_string[] = "syscall";
					gbString constraints = gb_string_make(heap_allocator(), "={rax}");
					for (unsigned i = 0; i < arg_count; i++) {
						constraints = gb_string_appendc(constraints, ",{");
						static char const *regs[] = {
							"rax",
							"rdi",
							"rsi",
							"rdx",
							"r10",
							"r8",
							"r9"
						};
						constraints = gb_string_appendc(constraints, regs[i]);
						constraints = gb_string_appendc(constraints, "}");
					}
					size_t asm_string_size = gb_strlen(asm_string);
					size_t constraints_size = gb_string_length(constraints);
					
					inline_asm = LLVMGetInlineAsm(func_type, asm_string, asm_string_size, constraints, constraints_size, true, false, LLVMInlineAsmDialectATT);
				}
				break;
			case TargetArch_386:
				{
					GB_ASSERT(arg_count <= 7);
					
					char asm_string_default[] = "int $0x80";
					char *asm_string = asm_string_default;
					gbString constraints = gb_string_make(heap_allocator(), "={eax}");
					
					for (unsigned i = 0; i < gb_min(arg_count, 6); i++) {
						constraints = gb_string_appendc(constraints, ",{");
						static char const *regs[] = {
							"eax",
							"ebx",
							"ecx",
							"edx",
							"esi",
							"edi",
						};
						constraints = gb_string_appendc(constraints, regs[i]);
						constraints = gb_string_appendc(constraints, "}");
					}
					if (arg_count == 7) {
						char asm_string7[] = "push %[arg6]\npush %%ebp\nmov 4(%%esp), %%ebp\nint $0x80\npop %%ebp\nadd $4, %%esp";
						asm_string = asm_string7;
						
						constraints = gb_string_appendc(constraints, ",rm");
					}
					
					size_t asm_string_size = gb_strlen(asm_string);
					size_t constraints_size = gb_string_length(constraints);
					
					inline_asm = LLVMGetInlineAsm(func_type, asm_string, asm_string_size, constraints, constraints_size, true, false, LLVMInlineAsmDialectATT);
				}
				break;
			case TargetArch_arm64:
				{
					GB_ASSERT(arg_count <= 7);
					
					char asm_string[] = "svc #0";
					gbString constraints = gb_string_make(heap_allocator(), "={x0}");
					for (unsigned i = 0; i < arg_count; i++) {
						constraints = gb_string_appendc(constraints, ",{");
						static char const *regs[] = {
							"x8",
							"x0",
							"x1",
							"x2",
							"x3",
							"x4",
							"x5",
						};
						constraints = gb_string_appendc(constraints, regs[i]);
						constraints = gb_string_appendc(constraints, "}");
					}
					size_t asm_string_size = gb_strlen(asm_string);
					size_t constraints_size = gb_string_length(constraints);
					
					inline_asm = LLVMGetInlineAsm(func_type, asm_string, asm_string_size, constraints, constraints_size, true, false, LLVMInlineAsmDialectATT);
				}
				break;
			default:
				GB_PANIC("Unsupported platform");
			}
			
			lbValue res = {};
			res.value = LLVMBuildCall2(p->builder, func_type, inline_asm, args, arg_count, "");
			res.type = t_uintptr;
			return res;
		}
	}

	GB_PANIC("Unhandled built-in procedure %.*s", LIT(builtin_procs[id].name));
	return {};
}


lbValue lb_handle_param_value(lbProcedure *p, Type *parameter_type, ParameterValue const &param_value, TokenPos const &pos) {
	switch (param_value.kind) {
	case ParameterValue_Constant:
		if (is_type_constant_type(parameter_type)) {
			auto res = lb_const_value(p->module, parameter_type, param_value.value);
			return res;
		} else {
			ExactValue ev = param_value.value;
			lbValue arg = {};
			Type *type = type_of_expr(param_value.original_ast_expr);
			if (type != nullptr) {
				arg = lb_const_value(p->module, type, ev);
			} else {
				arg = lb_const_value(p->module, parameter_type, param_value.value);
			}
			return lb_emit_conv(p, arg, parameter_type);
		}

	case ParameterValue_Nil:
		return lb_const_nil(p->module, parameter_type);
	case ParameterValue_Location:
		{
			String proc_name = {};
			if (p->entity != nullptr) {
				proc_name = p->entity->token.string;
			}
			return lb_emit_source_code_location(p, proc_name, pos);
		}
	case ParameterValue_Value:
		return lb_build_expr(p, param_value.ast_value);
	}
	return lb_const_nil(p->module, parameter_type);
}


lbValue lb_build_call_expr_internal(lbProcedure *p, Ast *expr);

lbValue lb_build_call_expr(lbProcedure *p, Ast *expr) {
	expr = unparen_expr(expr);
	ast_node(ce, CallExpr, expr);

	if (ce->sce_temp_data) {
		return *(lbValue *)ce->sce_temp_data;
	}

	lbValue res = lb_build_call_expr_internal(p, expr);

	if (ce->optional_ok_one) { // TODO(bill): Minor hack for #optional_ok procedures
		GB_ASSERT(is_type_tuple(res.type));
		GB_ASSERT(res.type->Tuple.variables.count == 2);
		return lb_emit_struct_ev(p, res, 0);
	}
	return res;
}
lbValue lb_build_call_expr_internal(lbProcedure *p, Ast *expr) {
	lbModule *m = p->module;

	TypeAndValue tv = type_and_value_of_expr(expr);

	ast_node(ce, CallExpr, expr);

	TypeAndValue proc_tv = type_and_value_of_expr(ce->proc);
	AddressingMode proc_mode = proc_tv.mode;
	if (proc_mode == Addressing_Type) {
		GB_ASSERT(ce->args.count == 1);
		lbValue x = lb_build_expr(p, ce->args[0]);
		lbValue y = lb_emit_conv(p, x, tv.type);
		return y;
	}

	Ast *pexpr = unparen_expr(ce->proc);
	if (proc_mode == Addressing_Builtin) {
		Entity *e = entity_of_node(pexpr);
		BuiltinProcId id = BuiltinProc_Invalid;
		if (e != nullptr) {
			id = cast(BuiltinProcId)e->Builtin.id;
		} else {
			id = BuiltinProc_DIRECTIVE;
		}
		return lb_build_builtin_proc(p, expr, tv, id);
	}

	// NOTE(bill): Regular call
	lbValue value = {};
	Ast *proc_expr = unparen_expr(ce->proc);
	if (proc_expr->tav.mode == Addressing_Constant) {
		ExactValue v = proc_expr->tav.value;
		switch (v.kind) {
		case ExactValue_Integer:
			{
				u64 u = big_int_to_u64(&v.value_integer);
				lbValue x = {};
				x.value = LLVMConstInt(lb_type(m, t_uintptr), u, false);
				x.type = t_uintptr;
				x = lb_emit_conv(p, x, t_rawptr);
				value = lb_emit_conv(p, x, proc_expr->tav.type);
				break;
			}
		case ExactValue_Pointer:
			{
				u64 u = cast(u64)v.value_pointer;
				lbValue x = {};
				x.value = LLVMConstInt(lb_type(m, t_uintptr), u, false);
				x.type = t_uintptr;
				x = lb_emit_conv(p, x, t_rawptr);
				value = lb_emit_conv(p, x, proc_expr->tav.type);
				break;
			}
		}
	}

	Entity *proc_entity = entity_of_node(proc_expr);
	if (proc_entity != nullptr) {
		if (proc_entity->flags & EntityFlag_Disabled) {
			return {};
		}
	}

	if (value.value == nullptr) {
		value = lb_build_expr(p, proc_expr);
	}

	GB_ASSERT(value.value != nullptr);
	Type *proc_type_ = base_type(value.type);
	GB_ASSERT(proc_type_->kind == Type_Proc);
	TypeProc *pt = &proc_type_->Proc;

	if (is_call_expr_field_value(ce)) {
		auto args = array_make<lbValue>(permanent_allocator(), pt->param_count);

		for_array(arg_index, ce->args) {
			Ast *arg = ce->args[arg_index];
			ast_node(fv, FieldValue, arg);
			GB_ASSERT(fv->field->kind == Ast_Ident);
			String name = fv->field->Ident.token.string;
			isize index = lookup_procedure_parameter(pt, name);
			GB_ASSERT(index >= 0);
			TypeAndValue tav = type_and_value_of_expr(fv->value);
			if (tav.mode == Addressing_Type) {
				args[index] = lb_const_nil(m, tav.type);
			} else {
				args[index] = lb_build_expr(p, fv->value);
			}
		}
		TypeTuple *params = &pt->params->Tuple;
		for (isize i = 0; i < args.count; i++) {
			Entity *e = params->variables[i];
			if (e->kind == Entity_TypeName) {
				args[i] = lb_const_nil(m, e->type);
			} else if (e->kind == Entity_Constant) {
				continue;
			} else {
				GB_ASSERT(e->kind == Entity_Variable);
				if (args[i].value == nullptr) {
					args[i] = lb_handle_param_value(p, e->type, e->Variable.param_value, ast_token(expr).pos);
				} else {
					args[i] = lb_emit_conv(p, args[i], e->type);
				}
			}
		}

		for (isize i = 0; i < args.count; i++) {
			Entity *e = params->variables[i];
			if (args[i].type == nullptr) {
				continue;
			} else if (is_type_untyped_nil(args[i].type)) {
				args[i] = lb_const_nil(m, e->type);
			} else if (is_type_untyped_undef(args[i].type)) {
				args[i] = lb_const_undef(m, e->type);
			}
		}

		return lb_emit_call(p, value, args, ce->inlining, p->copy_elision_hint.ast == expr);
	}

	isize arg_index = 0;

	isize arg_count = 0;
	for_array(i, ce->args) {
		Ast *arg = ce->args[i];
		TypeAndValue tav = type_and_value_of_expr(arg);
		GB_ASSERT_MSG(tav.mode != Addressing_Invalid, "%s %s %d", expr_to_string(arg), expr_to_string(expr), tav.mode);
		GB_ASSERT_MSG(tav.mode != Addressing_ProcGroup, "%s", expr_to_string(arg));
		Type *at = tav.type;
		if (at->kind == Type_Tuple) {
			arg_count += at->Tuple.variables.count;
		} else {
			arg_count++;
		}
	}

	isize param_count = 0;
	if (pt->params) {
		GB_ASSERT(pt->params->kind == Type_Tuple);
		param_count = pt->params->Tuple.variables.count;
	}

	auto args = array_make<lbValue>(permanent_allocator(), cast(isize)gb_max(param_count, arg_count));
	isize variadic_index = pt->variadic_index;
	bool variadic = pt->variadic && variadic_index >= 0;
	bool vari_expand = ce->ellipsis.pos.line != 0;
	bool is_c_vararg = pt->c_vararg;

	String proc_name = {};
	if (p->entity != nullptr) {
		proc_name = p->entity->token.string;
	}
	TokenPos pos = ast_token(ce->proc).pos;

	TypeTuple *param_tuple = nullptr;
	if (pt->params) {
		GB_ASSERT(pt->params->kind == Type_Tuple);
		param_tuple = &pt->params->Tuple;
	}

	for_array(i, ce->args) {
		Ast *arg = ce->args[i];
		TypeAndValue arg_tv = type_and_value_of_expr(arg);
		if (arg_tv.mode == Addressing_Type) {
			args[arg_index++] = lb_const_nil(m, arg_tv.type);
		} else {
			lbValue a = lb_build_expr(p, arg);
			Type *at = a.type;
			if (at->kind == Type_Tuple) {
				for_array(i, at->Tuple.variables) {
					lbValue v = lb_emit_struct_ev(p, a, cast(i32)i);
					args[arg_index++] = v;
				}
			} else {
				args[arg_index++] = a;
			}
		}
	}


	if (param_count > 0) {
		GB_ASSERT_MSG(pt->params != nullptr, "%s %td", expr_to_string(expr), pt->param_count);
		GB_ASSERT(param_count < 1000000);

		if (arg_count < param_count) {
			isize end = cast(isize)param_count;
			if (variadic) {
				end = variadic_index;
			}
			while (arg_index < end) {
				Entity *e = param_tuple->variables[arg_index];
				GB_ASSERT(e->kind == Entity_Variable);
				args[arg_index++] = lb_handle_param_value(p, e->type, e->Variable.param_value, ast_token(expr).pos);
			}
		}

		if (is_c_vararg) {
			GB_ASSERT(variadic);
			GB_ASSERT(!vari_expand);
			isize i = 0;
			for (; i < variadic_index; i++) {
				Entity *e = param_tuple->variables[i];
				if (e->kind == Entity_Variable) {
					args[i] = lb_emit_conv(p, args[i], e->type);
				}
			}
			Type *variadic_type = param_tuple->variables[i]->type;
			GB_ASSERT(is_type_slice(variadic_type));
			variadic_type = base_type(variadic_type)->Slice.elem;
			if (!is_type_any(variadic_type)) {
				for (; i < arg_count; i++) {
					args[i] = lb_emit_conv(p, args[i], variadic_type);
				}
			} else {
				for (; i < arg_count; i++) {
					args[i] = lb_emit_conv(p, args[i], default_type(args[i].type));
				}
			}
		} else if (variadic) {
			isize i = 0;
			for (; i < variadic_index; i++) {
				Entity *e = param_tuple->variables[i];
				if (e->kind == Entity_Variable) {
					args[i] = lb_emit_conv(p, args[i], e->type);
				}
			}
			if (!vari_expand) {
				Type *variadic_type = param_tuple->variables[i]->type;
				GB_ASSERT(is_type_slice(variadic_type));
				variadic_type = base_type(variadic_type)->Slice.elem;
				for (; i < arg_count; i++) {
					args[i] = lb_emit_conv(p, args[i], variadic_type);
				}
			}
		} else {
			for (isize i = 0; i < param_count; i++) {
				Entity *e = param_tuple->variables[i];
				if (e->kind == Entity_Variable) {
					if (args[i].value == nullptr) {
						continue;
					}
					GB_ASSERT_MSG(args[i].value != nullptr, "%.*s", LIT(e->token.string));
					args[i] = lb_emit_conv(p, args[i], e->type);
				}
			}
		}

		if (variadic && !vari_expand && !is_c_vararg) {
			// variadic call argument generation
			Type *slice_type = param_tuple->variables[variadic_index]->type;
			Type *elem_type  = base_type(slice_type)->Slice.elem;
			lbAddr slice = lb_add_local_generated(p, slice_type, true);
			isize slice_len = arg_count+1 - (variadic_index+1);

			if (slice_len > 0) {
				lbAddr base_array = lb_add_local_generated(p, alloc_type_array(elem_type, slice_len), true);

				for (isize i = variadic_index, j = 0; i < arg_count; i++, j++) {
					lbValue addr = lb_emit_array_epi(p, base_array.addr, cast(i32)j);
					lb_emit_store(p, addr, args[i]);
				}

				lbValue base_elem = lb_emit_array_epi(p, base_array.addr, 0);
				lbValue len = lb_const_int(m, t_int, slice_len);
				lb_fill_slice(p, slice, base_elem, len);
			}

			arg_count = param_count;
			args[variadic_index] = lb_addr_load(p, slice);
		}
	}

	if (variadic && variadic_index+1 < param_count) {
		for (isize i = variadic_index+1; i < param_count; i++) {
			Entity *e = param_tuple->variables[i];
			args[i] = lb_handle_param_value(p, e->type, e->Variable.param_value, ast_token(expr).pos);
		}
	}

	isize final_count = param_count;
	if (is_c_vararg) {
		final_count = arg_count;
	}

	if (param_tuple != nullptr) {
		for (isize i = 0; i < gb_min(args.count, param_tuple->variables.count); i++) {
			Entity *e = param_tuple->variables[i];
			if (args[i].type == nullptr) {
				continue;
			} else if (is_type_untyped_nil(args[i].type)) {
				args[i] = lb_const_nil(m, e->type);
			} else if (is_type_untyped_undef(args[i].type)) {
				args[i] = lb_const_undef(m, e->type);
			}
		}
	}

	auto call_args = array_slice(args, 0, final_count);
	return lb_emit_call(p, value, call_args, ce->inlining, p->copy_elision_hint.ast == expr);
}