Use direct parameter value in `lb_find_ident` when possible

src/llvm_backend.hpp

@@ -298,6 +298,7 @@ struct lbProcedure {
 	lbBlock *        entry_block;
 	lbBlock *        curr_block;
 	lbTargetList *   target_list;
+	PtrMap<Entity *, lbValue> direct_parameters;
 
 	Ast *curr_stmt;
 

src/llvm_backend_general.cpp

@@ -2590,6 +2590,15 @@ lbValue lb_find_or_add_entity_string_byte_slice_with_type(lbModule *m, String co
 
 
 lbValue lb_find_ident(lbProcedure *p, lbModule *m, Entity *e, Ast *expr) {
+	if (e->flags & EntityFlag_Param) {
+		// NOTE(bill): Bypass the stack copied variable for
+		// direct parameters as there is no need for the direct load
+		auto *found = map_get(&p->direct_parameters, e);
+		if (found) {
+			return *found;
+		}
+	}
+
 	auto *found = map_get(&m->values, e);
 	if (found) {
 		auto v = *found;

src/llvm_backend_proc.cpp

@@ -486,6 +486,8 @@ void lb_begin_procedure_body(lbProcedure *p) {
 	p->entry_block = lb_create_block(p, "entry", true);
 	lb_start_block(p, p->entry_block);
 
+	map_init(&p->direct_parameters, heap_allocator());
+
 	GB_ASSERT(p->type != nullptr);
 
 	lb_ensure_abi_function_type(p->module, p);
@@ -539,6 +541,8 @@ void lb_begin_procedure_body(lbProcedure *p) {
 						param.value = value;
 						param.type = e->type;
 
+						map_set(&p->direct_parameters, e, param);
+
 						lbValue ptr = lb_address_from_load_or_generate_local(p, param);
 						GB_ASSERT(LLVMIsAAllocaInst(ptr.value));
 						lb_add_entity(p->module, e, ptr);