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@@ -28,7 +28,6 @@
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[email protected]
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*/
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-// Modified by Lasse Öörni for Urho3D
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//
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// as_callfunc_x86.cpp
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@@ -50,6 +49,29 @@
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BEGIN_AS_NAMESPACE
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+//
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+// With some compile level optimizations the functions don't clear the FPU
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+// stack themselves. So we have to do it as part of calling the native functions,
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+// as the compiler will not be able to predict when it is supposed to do it by
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+// itself due to the dynamic nature of scripts
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+//
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+// - fninit clears the FPU stack and the FPU control word
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+// - emms only clears the FPU stack, while preserving the FPU control word
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+//
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+// By default I use fninit as it seems to be what works for most people,
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+// but some may find it necessary to define this as emms instead.
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+//
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+// TODO: Figure out when one or the other must be used, and a way to
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+// configure this automatically in as_config.h
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+//
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+#ifndef CLEAR_FPU_STACK
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+#define CLEAR_FPU_STACK fninit
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+#endif
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+
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+// These macros are just to allow me to use the above macro in the GNUC style inline assembly
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+#define _S(x) _TOSTRING(x)
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+#define _TOSTRING(x) #x
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+
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typedef asQWORD (*t_CallCDeclQW)(const asDWORD *, int, size_t);
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typedef asQWORD (*t_CallCDeclQWObj)(void *obj, const asDWORD *, int, size_t);
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typedef asDWORD (*t_CallCDeclRetByRef)(const asDWORD *, int, size_t, void *);
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@@ -245,8 +267,7 @@ void NOINLINE CallCDeclFunction(const asDWORD *args, int paramSize, size_t func)
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push ecx
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// Clear the FPU stack, in case the called function doesn't do it by itself
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- // Use emms instead of fninit to preserve FPU control word
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- emms
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+ CLEAR_FPU_STACK
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// Copy arguments from script
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// stack to application stack
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@@ -281,7 +302,7 @@ endcopy:
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UNUSED_VAR(func);
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asm("pushl %ecx \n"
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- "emms \n"
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+ _S(CLEAR_FPU_STACK) "\n"
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// Need to align the stack pointer so that it is aligned to 16 bytes when making the function call.
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// It is assumed that when entering this function, the stack pointer is already aligned, so we need
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@@ -329,8 +350,7 @@ void NOINLINE CallCDeclFunctionObjLast(const void *obj, const asDWORD *args, int
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push ecx
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// Clear the FPU stack, in case the called function doesn't do it by itself
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- // Use emms instead of fninit to preserve FPU control word
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- emms
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+ CLEAR_FPU_STACK
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// Push the object pointer as the last argument to the function
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push obj
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@@ -370,7 +390,7 @@ endcopy:
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UNUSED_VAR(func);
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asm("pushl %ecx \n"
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- "emms \n"
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+ _S(CLEAR_FPU_STACK) "\n"
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// Need to align the stack pointer so that it is aligned to 16 bytes when making the function call.
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// It is assumed that when entering this function, the stack pointer is already aligned, so we need
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@@ -420,8 +440,7 @@ void NOINLINE CallCDeclFunctionObjFirst(const void *obj, const asDWORD *args, in
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push ecx
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// Clear the FPU stack, in case the called function doesn't do it by itself
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- // Use emms instead of fninit to preserve FPU control word
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- emms
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+ CLEAR_FPU_STACK
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// Copy arguments from script
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// stack to application stack
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@@ -461,7 +480,7 @@ endcopy:
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UNUSED_VAR(func);
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asm("pushl %ecx \n"
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- "emms \n"
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+ _S(CLEAR_FPU_STACK) "\n"
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// Need to align the stack pointer so that it is aligned to 16 bytes when making the function call.
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// It is assumed that when entering this function, the stack pointer is already aligned, so we need
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@@ -511,8 +530,7 @@ void NOINLINE CallCDeclFunctionRetByRefObjFirst_impl(const void *obj, const asDW
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push ecx
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// Clear the FPU stack, in case the called function doesn't do it by itself
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- // Use emms instead of fninit to preserve FPU control word
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- emms
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+ CLEAR_FPU_STACK
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// Copy arguments from script
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// stack to application stack
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@@ -561,7 +579,7 @@ endcopy:
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UNUSED_VAR(retPtr);
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asm("pushl %ecx \n"
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- "emms \n"
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+ _S(CLEAR_FPU_STACK) "\n"
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// Need to align the stack pointer so that it is aligned to 16 bytes when making the function call.
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// It is assumed that when entering this function, the stack pointer is already aligned, so we need
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@@ -615,8 +633,7 @@ void NOINLINE CallCDeclFunctionRetByRef_impl(const asDWORD *args, int paramSize,
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push ecx
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// Clear the FPU stack, in case the called function doesn't do it by itself
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- // Use emms instead of fninit to preserve FPU control word
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- emms
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+ CLEAR_FPU_STACK
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// Copy arguments from script
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// stack to application stack
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@@ -659,7 +676,7 @@ endcopy:
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UNUSED_VAR(retPtr);
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asm("pushl %ecx \n"
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- "emms \n"
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+ _S(CLEAR_FPU_STACK) "\n"
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// Need to align the stack pointer so that it is aligned to 16 bytes when making the function call.
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// It is assumed that when entering this function, the stack pointer is already aligned, so we need
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@@ -710,8 +727,7 @@ void NOINLINE CallCDeclFunctionRetByRefObjLast_impl(const void *obj, const asDWO
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push ecx
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// Clear the FPU stack, in case the called function doesn't do it by itself
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- // Use emms instead of fninit to preserve FPU control word
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- emms
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+ CLEAR_FPU_STACK
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push obj
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@@ -758,7 +774,7 @@ endcopy:
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UNUSED_VAR(retPtr);
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asm("pushl %ecx \n"
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- "emms \n"
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+ _S(CLEAR_FPU_STACK) "\n"
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// Need to align the stack pointer so that it is aligned to 16 bytes when making the function call.
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// It is assumed that when entering this function, the stack pointer is already aligned, so we need
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@@ -812,8 +828,7 @@ void NOINLINE CallSTDCallFunction(const asDWORD *args, int paramSize, size_t fun
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push ecx
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// Clear the FPU stack, in case the called function doesn't do it by itself
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- // Use emms instead of fninit to preserve FPU control word
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- emms
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+ CLEAR_FPU_STACK
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// Copy arguments from script
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// stack to application stack
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@@ -847,7 +862,7 @@ endcopy:
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UNUSED_VAR(func);
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asm("pushl %ecx \n"
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- "emms \n"
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+ _S(CLEAR_FPU_STACK) "\n"
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// Need to align the stack pointer so that it is aligned to 16 bytes when making the function call.
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// It is assumed that when entering this function, the stack pointer is already aligned, so we need
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@@ -895,8 +910,7 @@ void NOINLINE CallThisCallFunction(const void *obj, const asDWORD *args, int par
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push ecx
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// Clear the FPU stack, in case the called function doesn't do it by itself
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- // Use emms instead of fninit to preserve FPU control word
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- emms
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+ CLEAR_FPU_STACK
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// Copy arguments from script
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// stack to application stack
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@@ -946,7 +960,7 @@ endcopy:
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UNUSED_VAR(func);
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asm("pushl %ecx \n"
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- "emms \n"
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+ _S(CLEAR_FPU_STACK) "\n"
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// Need to align the stack pointer so that it is aligned to 16 bytes when making the function call.
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// It is assumed that when entering this function, the stack pointer is already aligned, so we need
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@@ -997,8 +1011,7 @@ void NOINLINE CallThisCallFunctionRetByRef_impl(const void *obj, const asDWORD *
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push ecx
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// Clear the FPU stack, in case the called function doesn't do it by itself
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- // Use emms instead of fninit to preserve FPU control word
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- emms
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+ CLEAR_FPU_STACK
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// Copy arguments from script
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// stack to application stack
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@@ -1057,7 +1070,7 @@ endcopy:
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UNUSED_VAR(retPtr);
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asm("pushl %ecx \n"
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- "emms \n"
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+ _S(CLEAR_FPU_STACK) "\n"
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// Need to align the stack pointer so that it is aligned to 16 bytes when making the function call.
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// It is assumed that when entering this function, the stack pointer is already aligned, so we need
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Lasse Öörni