fast_floor.diff
| D:/code/nel/include/nel/misc/fast_floor.h (working copy) | ||
|---|---|---|
| 33 | 33 |
// fastFloor function. |
| 34 | 34 |
// Actually, it seems to be bugged on VC7 (functions returns bad values) |
| 35 | 35 |
// TODO: fix that |
| 36 |
#if defined(NL_OS_WINDOWS) && !defined(NL_NO_ASM) |
|
| 37 |
// && defined(NL_COMP_VC6) |
|
| 36 |
#if defined(NL_OS_WINDOWS) |
|
| 38 | 37 |
|
| 39 | 38 |
#include <cfloat> |
| 39 |
#ifdef NL_NO_ASM |
|
| 40 |
#include <smmintrin.h> |
|
| 41 |
#endif |
|
| 40 | 42 |
|
| 41 | 43 |
// The magic constant value. support both positive and negative numbers. |
| 42 | 44 |
extern double OptFastFloorMagicConst ; |
| ... | ... | |
| 74 | 76 |
// Force __stdcall to not pass parameters in registers. |
| 75 | 77 |
inline sint32 __stdcall OptFastFloor(float x) |
| 76 | 78 |
{
|
| 77 |
static __int64 res; |
|
| 79 |
#ifdef NL_NO_ASM |
|
| 80 |
__m128 a; |
|
| 81 |
a.m128_f32[0] = x; |
|
| 82 |
return _mm_cvtss_si32(a); |
|
| 83 |
#else |
|
| 84 |
static __int64 res; |
|
| 78 | 85 |
__asm |
| 79 | 86 |
{
|
| 80 | 87 |
fld x |
| ... | ... | |
| 83 | 90 |
} |
| 84 | 91 |
|
| 85 | 92 |
return (sint32) (res&0xFFFFFFFF); |
| 93 |
#endif |
|
| 86 | 94 |
} |
| 87 | 95 |
|
| 88 | 96 |
|
| 89 | 97 |
// Force __stdcall to not pass parameters in registers. |
| 90 | 98 |
inline float __stdcall OptFastFractionnalPart(float x) |
| 91 | 99 |
{
|
| 100 |
#ifdef NL_NO_ASM |
|
| 101 |
return x - OptFastFloor(x); |
|
| 102 |
#else |
|
| 92 | 103 |
static double res; |
| 93 | 104 |
__asm |
| 94 | 105 |
{
|
| ... | ... | |
| 101 | 112 |
} |
| 102 | 113 |
|
| 103 | 114 |
return * (float *) &res; |
| 115 |
#endif |
|
| 104 | 116 |
} |
| 105 | 117 |
|
| 106 | 118 |
|
| ... | ... | |
| 122 | 134 |
/// Same method as OptFastFloor, but result are always positive and should never be bigger than 2^23-1 |
| 123 | 135 |
inline uint32 __stdcall OptFastFloor24(float x) |
| 124 | 136 |
{
|
| 137 |
#ifdef NL_NO_ASM |
|
| 138 |
__m128 a; |
|
| 139 |
a.m128_f32[0] = x; |
|
| 140 |
return (uint32)_mm_cvtss_si32(a); |
|
| 141 |
#else |
|
| 125 | 142 |
static uint32 res; |
| 126 | 143 |
__asm |
| 127 | 144 |
{
|
| ... | ... | |
| 131 | 148 |
} |
| 132 | 149 |
|
| 133 | 150 |
return res; |
| 151 |
#endif |
|
| 134 | 152 |
} |
| 135 | 153 |
|
| 136 | 154 |
|