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project64
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standardize exception-prone x86 behavior to normal C division

This commit is contained in:
unknown 2015-03-23 01:20:23 -04:00
parent 9d87703eef
commit f82699c378
2 changed files with 15 additions and 16 deletions
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2
Source/Glide64/DepthBufferRender.cpp
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@ -87,7 +87,7 @@ static int left_z, left_dzdy;
extern "C" int imul16(int x, int y); extern "C" int imul16(int x, int y);
extern "C" int imul14(int x, int y); extern "C" int imul14(int x, int y);
extern "C" int idiv16(int x, int y); extern int idiv16(int x, int y);
__inline int iceil(int x) __inline int iceil(int x)
{ {

29
Source/Glide64/FixedPoint.asm.cpp
View File

@ -35,6 +35,12 @@
; ;
;****************************************************************/ ;****************************************************************/
#if defined(_MSC_VER) && !defined(_STDINT)
typedef signed __int64 int64_t;
#else
#include <stdint.h>
#endif
// (x * y) >> 16 // (x * y) >> 16
extern "C" int __declspec(naked) imul16(int x, int y) extern "C" int __declspec(naked) imul16(int x, int y)
{ {
@ -65,19 +71,12 @@ extern "C" int __declspec(naked) imul14(int x, int y)
} }
} }
//(x << 16) / y int idiv16(int x, int y)
extern "C" int __declspec(naked) idiv16(int x, int y)
{ {
_asm { int64_t result;
push ebp const int64_t m = (int64_t)(x);
mov ebp,esp const int64_t n = (int64_t)(y);
mov eax, [x]
mov ebx, [y] result = (m << 16) / n;
mov edx,eax return (int)(result);
sar edx,16 }
shl eax,16
idiv ebx
leave
ret
}
}