| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2014 Sam Lantinga <[email protected]> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "../SDL_internal.h" |
| |
| /* This file contains portable stdlib functions for SDL */ |
| |
| #include "SDL_stdinc.h" |
| #include "../libm/math_libm.h" |
| |
| |
| double |
| SDL_atan(double x) |
| { |
| #ifdef HAVE_ATAN |
| return atan(x); |
| #else |
| return SDL_uclibc_atan(x); |
| #endif /* HAVE_ATAN */ |
| } |
| |
| double |
| SDL_atan2(double x, double y) |
| { |
| #if defined(HAVE_ATAN2) |
| return atan2(x, y); |
| #else |
| return SDL_uclibc_atan2(x, y); |
| #endif /* HAVE_ATAN2 */ |
| } |
| |
| double |
| SDL_acos(double val) |
| { |
| #if defined(HAVE_ACOS) |
| return acos(val); |
| #else |
| double result; |
| if (val == -1.0) { |
| result = M_PI; |
| } else { |
| result = SDL_atan(SDL_sqrt(1.0 - val * val) / val); |
| if (result < 0.0) |
| { |
| result += M_PI; |
| } |
| } |
| return result; |
| #endif |
| } |
| |
| double |
| SDL_asin(double val) |
| { |
| #if defined(HAVE_ASIN) |
| return asin(val); |
| #else |
| double result; |
| if (val == -1.0) { |
| result = -(M_PI / 2.0); |
| } else { |
| result = (M_PI / 2.0) - SDL_acos(val); |
| } |
| return result; |
| #endif |
| } |
| |
| double |
| SDL_ceil(double x) |
| { |
| #ifdef HAVE_CEIL |
| return ceil(x); |
| #else |
| double integer = SDL_floor(x); |
| double fraction = x - integer; |
| if (fraction > 0.0) { |
| integer += 1.0; |
| } |
| return integer; |
| #endif /* HAVE_CEIL */ |
| } |
| |
| double |
| SDL_copysign(double x, double y) |
| { |
| #if defined(HAVE_COPYSIGN) |
| return copysign(x, y); |
| #elif defined(HAVE__COPYSIGN) |
| return _copysign(x, y); |
| #else |
| return SDL_uclibc_copysign(x, y); |
| #endif /* HAVE_COPYSIGN */ |
| } |
| |
| double |
| SDL_cos(double x) |
| { |
| #if defined(HAVE_COS) |
| return cos(x); |
| #else |
| return SDL_uclibc_cos(x); |
| #endif /* HAVE_COS */ |
| } |
| |
| float |
| SDL_cosf(float x) |
| { |
| #ifdef HAVE_COSF |
| return cosf(x); |
| #else |
| return (float)SDL_cos((double)x); |
| #endif |
| } |
| |
| double |
| SDL_fabs(double x) |
| { |
| #if defined(HAVE_FABS) |
| return fabs(x); |
| #else |
| return SDL_uclibc_fabs(x); |
| #endif /* HAVE_FABS */ |
| } |
| |
| double |
| SDL_floor(double x) |
| { |
| #if defined(HAVE_FLOOR) |
| return floor(x); |
| #else |
| return SDL_uclibc_floor(x); |
| #endif /* HAVE_FLOOR */ |
| } |
| |
| double |
| SDL_log(double x) |
| { |
| #if defined(HAVE_LOG) |
| return log(x); |
| #else |
| return SDL_uclibc_log(x); |
| #endif /* HAVE_LOG */ |
| } |
| |
| double |
| SDL_pow(double x, double y) |
| { |
| #if defined(HAVE_POW) |
| return pow(x, y); |
| #else |
| return SDL_uclibc_pow(x, y); |
| #endif /* HAVE_POW */ |
| } |
| |
| double |
| SDL_scalbn(double x, int n) |
| { |
| #if defined(HAVE_SCALBN) |
| return scalbn(x, n); |
| #elif defined(HAVE__SCALB) |
| return _scalb(x, n); |
| #else |
| return SDL_uclibc_scalbn(x, n); |
| #endif /* HAVE_SCALBN */ |
| } |
| |
| double |
| SDL_sin(double x) |
| { |
| #if defined(HAVE_SIN) |
| return sin(x); |
| #else |
| return SDL_uclibc_sin(x); |
| #endif /* HAVE_SIN */ |
| } |
| |
| float |
| SDL_sinf(float x) |
| { |
| #ifdef HAVE_SINF |
| return sinf(x); |
| #else |
| return (float)SDL_sin((double)x); |
| #endif /* HAVE_SINF */ |
| } |
| |
| double |
| SDL_sqrt(double x) |
| { |
| #if defined(HAVE_SQRT) |
| return sqrt(x); |
| #else |
| return SDL_uclibc_sqrt(x); |
| #endif |
| } |
| |
| int SDL_abs(int x) |
| { |
| #ifdef HAVE_ABS |
| return abs(x); |
| #else |
| return ((x) < 0 ? -(x) : (x)); |
| #endif |
| } |
| |
| #ifdef HAVE_CTYPE_H |
| int SDL_isdigit(int x) { return isdigit(x); } |
| int SDL_isspace(int x) { return isspace(x); } |
| int SDL_toupper(int x) { return toupper(x); } |
| int SDL_tolower(int x) { return tolower(x); } |
| #else |
| int SDL_isdigit(int x) { return ((x) >= '0') && ((x) <= '9'); } |
| int SDL_isspace(int x) { return ((x) == ' ') || ((x) == '\t') || ((x) == '\r') || ((x) == '\n') || ((x) == '\f') || ((x) == '\v'); } |
| int SDL_toupper(int x) { return ((x) >= 'a') && ((x) <= 'z') ? ('A'+((x)-'a')) : (x); } |
| int SDL_tolower(int x) { return ((x) >= 'A') && ((x) <= 'Z') ? ('a'+((x)-'A')) : (x); } |
| #endif |
| |
| |
| #ifndef HAVE_LIBC |
| /* These are some C runtime intrinsics that need to be defined */ |
| |
| #if defined(_MSC_VER) |
| |
| #ifndef __FLTUSED__ |
| #define __FLTUSED__ |
| __declspec(selectany) int _fltused = 1; |
| #endif |
| |
| /* The optimizer on Visual Studio 2010/2012 generates memcpy() calls */ |
| #if _MSC_VER >= 1600 && defined(_WIN64) && !defined(_DEBUG) |
| #include <intrin.h> |
| |
| #pragma function(memcpy) |
| void * memcpy ( void * destination, const void * source, size_t num ) |
| { |
| const Uint8 *src = (const Uint8 *)source; |
| Uint8 *dst = (Uint8 *)destination; |
| size_t i; |
| |
| /* All WIN64 architectures have SSE, right? */ |
| if (!((uintptr_t) src & 15) && !((uintptr_t) dst & 15)) { |
| __m128 values[4]; |
| for (i = num / 64; i--;) { |
| _mm_prefetch(src, _MM_HINT_NTA); |
| values[0] = *(__m128 *) (src + 0); |
| values[1] = *(__m128 *) (src + 16); |
| values[2] = *(__m128 *) (src + 32); |
| values[3] = *(__m128 *) (src + 48); |
| _mm_stream_ps((float *) (dst + 0), values[0]); |
| _mm_stream_ps((float *) (dst + 16), values[1]); |
| _mm_stream_ps((float *) (dst + 32), values[2]); |
| _mm_stream_ps((float *) (dst + 48), values[3]); |
| src += 64; |
| dst += 64; |
| } |
| num &= 63; |
| } |
| |
| while (num--) { |
| *dst++ = *src++; |
| } |
| return destination; |
| } |
| #endif /* _MSC_VER == 1600 && defined(_WIN64) && !defined(_DEBUG) */ |
| |
| #ifdef _M_IX86 |
| |
| /* Float to long */ |
| void |
| __declspec(naked) |
| _ftol() |
| { |
| /* *INDENT-OFF* */ |
| __asm { |
| push ebp |
| mov ebp,esp |
| sub esp,20h |
| and esp,0FFFFFFF0h |
| fld st(0) |
| fst dword ptr [esp+18h] |
| fistp qword ptr [esp+10h] |
| fild qword ptr [esp+10h] |
| mov edx,dword ptr [esp+18h] |
| mov eax,dword ptr [esp+10h] |
| test eax,eax |
| je integer_QnaN_or_zero |
| arg_is_not_integer_QnaN: |
| fsubp st(1),st |
| test edx,edx |
| jns positive |
| fstp dword ptr [esp] |
| mov ecx,dword ptr [esp] |
| xor ecx,80000000h |
| add ecx,7FFFFFFFh |
| adc eax,0 |
| mov edx,dword ptr [esp+14h] |
| adc edx,0 |
| jmp localexit |
| positive: |
| fstp dword ptr [esp] |
| mov ecx,dword ptr [esp] |
| add ecx,7FFFFFFFh |
| sbb eax,0 |
| mov edx,dword ptr [esp+14h] |
| sbb edx,0 |
| jmp localexit |
| integer_QnaN_or_zero: |
| mov edx,dword ptr [esp+14h] |
| test edx,7FFFFFFFh |
| jne arg_is_not_integer_QnaN |
| fstp dword ptr [esp+18h] |
| fstp dword ptr [esp+18h] |
| localexit: |
| leave |
| ret |
| } |
| /* *INDENT-ON* */ |
| } |
| |
| void |
| _ftol2_sse() |
| { |
| _ftol(); |
| } |
| |
| /* 64-bit math operators for 32-bit systems */ |
| void |
| __declspec(naked) |
| _allmul() |
| { |
| /* *INDENT-OFF* */ |
| __asm { |
| push ebp |
| mov ebp,esp |
| push edi |
| push esi |
| push ebx |
| sub esp,0Ch |
| mov eax,dword ptr [ebp+10h] |
| mov edi,dword ptr [ebp+8] |
| mov ebx,eax |
| mov esi,eax |
| sar esi,1Fh |
| mov eax,dword ptr [ebp+8] |
| mul ebx |
| imul edi,esi |
| mov ecx,edx |
| mov dword ptr [ebp-18h],eax |
| mov edx,dword ptr [ebp+0Ch] |
| add ecx,edi |
| imul ebx,edx |
| mov eax,dword ptr [ebp-18h] |
| lea ebx,[ebx+ecx] |
| mov dword ptr [ebp-14h],ebx |
| mov edx,dword ptr [ebp-14h] |
| add esp,0Ch |
| pop ebx |
| pop esi |
| pop edi |
| pop ebp |
| ret 10h |
| } |
| /* *INDENT-ON* */ |
| } |
| |
| void |
| __declspec(naked) |
| _alldiv() |
| { |
| /* *INDENT-OFF* */ |
| __asm { |
| push edi |
| push esi |
| push ebx |
| xor edi,edi |
| mov eax,dword ptr [esp+14h] |
| or eax,eax |
| jge L1 |
| inc edi |
| mov edx,dword ptr [esp+10h] |
| neg eax |
| neg edx |
| sbb eax,0 |
| mov dword ptr [esp+14h],eax |
| mov dword ptr [esp+10h],edx |
| L1: |
| mov eax,dword ptr [esp+1Ch] |
| or eax,eax |
| jge L2 |
| inc edi |
| mov edx,dword ptr [esp+18h] |
| neg eax |
| neg edx |
| sbb eax,0 |
| mov dword ptr [esp+1Ch],eax |
| mov dword ptr [esp+18h],edx |
| L2: |
| or eax,eax |
| jne L3 |
| mov ecx,dword ptr [esp+18h] |
| mov eax,dword ptr [esp+14h] |
| xor edx,edx |
| div ecx |
| mov ebx,eax |
| mov eax,dword ptr [esp+10h] |
| div ecx |
| mov edx,ebx |
| jmp L4 |
| L3: |
| mov ebx,eax |
| mov ecx,dword ptr [esp+18h] |
| mov edx,dword ptr [esp+14h] |
| mov eax,dword ptr [esp+10h] |
| L5: |
| shr ebx,1 |
| rcr ecx,1 |
| shr edx,1 |
| rcr eax,1 |
| or ebx,ebx |
| jne L5 |
| div ecx |
| mov esi,eax |
| mul dword ptr [esp+1Ch] |
| mov ecx,eax |
| mov eax,dword ptr [esp+18h] |
| mul esi |
| add edx,ecx |
| jb L6 |
| cmp edx,dword ptr [esp+14h] |
| ja L6 |
| jb L7 |
| cmp eax,dword ptr [esp+10h] |
| jbe L7 |
| L6: |
| dec esi |
| L7: |
| xor edx,edx |
| mov eax,esi |
| L4: |
| dec edi |
| jne L8 |
| neg edx |
| neg eax |
| sbb edx,0 |
| L8: |
| pop ebx |
| pop esi |
| pop edi |
| ret 10h |
| } |
| /* *INDENT-ON* */ |
| } |
| |
| void |
| __declspec(naked) |
| _aulldiv() |
| { |
| /* *INDENT-OFF* */ |
| __asm { |
| push ebx |
| push esi |
| mov eax,dword ptr [esp+18h] |
| or eax,eax |
| jne L1 |
| mov ecx,dword ptr [esp+14h] |
| mov eax,dword ptr [esp+10h] |
| xor edx,edx |
| div ecx |
| mov ebx,eax |
| mov eax,dword ptr [esp+0Ch] |
| div ecx |
| mov edx,ebx |
| jmp L2 |
| L1: |
| mov ecx,eax |
| mov ebx,dword ptr [esp+14h] |
| mov edx,dword ptr [esp+10h] |
| mov eax,dword ptr [esp+0Ch] |
| L3: |
| shr ecx,1 |
| rcr ebx,1 |
| shr edx,1 |
| rcr eax,1 |
| or ecx,ecx |
| jne L3 |
| div ebx |
| mov esi,eax |
| mul dword ptr [esp+18h] |
| mov ecx,eax |
| mov eax,dword ptr [esp+14h] |
| mul esi |
| add edx,ecx |
| jb L4 |
| cmp edx,dword ptr [esp+10h] |
| ja L4 |
| jb L5 |
| cmp eax,dword ptr [esp+0Ch] |
| jbe L5 |
| L4: |
| dec esi |
| L5: |
| xor edx,edx |
| mov eax,esi |
| L2: |
| pop esi |
| pop ebx |
| ret 10h |
| } |
| /* *INDENT-ON* */ |
| } |
| |
| void |
| __declspec(naked) |
| _allrem() |
| { |
| /* *INDENT-OFF* */ |
| __asm { |
| push ebx |
| push edi |
| xor edi,edi |
| mov eax,dword ptr [esp+10h] |
| or eax,eax |
| jge L1 |
| inc edi |
| mov edx,dword ptr [esp+0Ch] |
| neg eax |
| neg edx |
| sbb eax,0 |
| mov dword ptr [esp+10h],eax |
| mov dword ptr [esp+0Ch],edx |
| L1: |
| mov eax,dword ptr [esp+18h] |
| or eax,eax |
| jge L2 |
| mov edx,dword ptr [esp+14h] |
| neg eax |
| neg edx |
| sbb eax,0 |
| mov dword ptr [esp+18h],eax |
| mov dword ptr [esp+14h],edx |
| L2: |
| or eax,eax |
| jne L3 |
| mov ecx,dword ptr [esp+14h] |
| mov eax,dword ptr [esp+10h] |
| xor edx,edx |
| div ecx |
| mov eax,dword ptr [esp+0Ch] |
| div ecx |
| mov eax,edx |
| xor edx,edx |
| dec edi |
| jns L4 |
| jmp L8 |
| L3: |
| mov ebx,eax |
| mov ecx,dword ptr [esp+14h] |
| mov edx,dword ptr [esp+10h] |
| mov eax,dword ptr [esp+0Ch] |
| L5: |
| shr ebx,1 |
| rcr ecx,1 |
| shr edx,1 |
| rcr eax,1 |
| or ebx,ebx |
| jne L5 |
| div ecx |
| mov ecx,eax |
| mul dword ptr [esp+18h] |
| xchg eax,ecx |
| mul dword ptr [esp+14h] |
| add edx,ecx |
| jb L6 |
| cmp edx,dword ptr [esp+10h] |
| ja L6 |
| jb L7 |
| cmp eax,dword ptr [esp+0Ch] |
| jbe L7 |
| L6: |
| sub eax,dword ptr [esp+14h] |
| sbb edx,dword ptr [esp+18h] |
| L7: |
| sub eax,dword ptr [esp+0Ch] |
| sbb edx,dword ptr [esp+10h] |
| dec edi |
| jns L8 |
| L4: |
| neg edx |
| neg eax |
| sbb edx,0 |
| L8: |
| pop edi |
| pop ebx |
| ret 10h |
| } |
| /* *INDENT-ON* */ |
| } |
| |
| void |
| __declspec(naked) |
| _aullrem() |
| { |
| /* *INDENT-OFF* */ |
| __asm { |
| push ebx |
| mov eax,dword ptr [esp+14h] |
| or eax,eax |
| jne L1 |
| mov ecx,dword ptr [esp+10h] |
| mov eax,dword ptr [esp+0Ch] |
| xor edx,edx |
| div ecx |
| mov eax,dword ptr [esp+8] |
| div ecx |
| mov eax,edx |
| xor edx,edx |
| jmp L2 |
| L1: |
| mov ecx,eax |
| mov ebx,dword ptr [esp+10h] |
| mov edx,dword ptr [esp+0Ch] |
| mov eax,dword ptr [esp+8] |
| L3: |
| shr ecx,1 |
| rcr ebx,1 |
| shr edx,1 |
| rcr eax,1 |
| or ecx,ecx |
| jne L3 |
| div ebx |
| mov ecx,eax |
| mul dword ptr [esp+14h] |
| xchg eax,ecx |
| mul dword ptr [esp+10h] |
| add edx,ecx |
| jb L4 |
| cmp edx,dword ptr [esp+0Ch] |
| ja L4 |
| jb L5 |
| cmp eax,dword ptr [esp+8] |
| jbe L5 |
| L4: |
| sub eax,dword ptr [esp+10h] |
| sbb edx,dword ptr [esp+14h] |
| L5: |
| sub eax,dword ptr [esp+8] |
| sbb edx,dword ptr [esp+0Ch] |
| neg edx |
| neg eax |
| sbb edx,0 |
| L2: |
| pop ebx |
| ret 10h |
| } |
| /* *INDENT-ON* */ |
| } |
| |
| void |
| __declspec(naked) |
| _alldvrm() |
| { |
| /* *INDENT-OFF* */ |
| __asm { |
| push edi |
| push esi |
| push ebp |
| xor edi,edi |
| xor ebp,ebp |
| mov eax,dword ptr [esp+14h] |
| or eax,eax |
| jge L1 |
| inc edi |
| inc ebp |
| mov edx,dword ptr [esp+10h] |
| neg eax |
| neg edx |
| sbb eax,0 |
| mov dword ptr [esp+14h],eax |
| mov dword ptr [esp+10h],edx |
| L1: |
| mov eax,dword ptr [esp+1Ch] |
| or eax,eax |
| jge L2 |
| inc edi |
| mov edx,dword ptr [esp+18h] |
| neg eax |
| neg edx |
| sbb eax,0 |
| mov dword ptr [esp+1Ch],eax |
| mov dword ptr [esp+18h],edx |
| L2: |
| or eax,eax |
| jne L3 |
| mov ecx,dword ptr [esp+18h] |
| mov eax,dword ptr [esp+14h] |
| xor edx,edx |
| div ecx |
| mov ebx,eax |
| mov eax,dword ptr [esp+10h] |
| div ecx |
| mov esi,eax |
| mov eax,ebx |
| mul dword ptr [esp+18h] |
| mov ecx,eax |
| mov eax,esi |
| mul dword ptr [esp+18h] |
| add edx,ecx |
| jmp L4 |
| L3: |
| mov ebx,eax |
| mov ecx,dword ptr [esp+18h] |
| mov edx,dword ptr [esp+14h] |
| mov eax,dword ptr [esp+10h] |
| L5: |
| shr ebx,1 |
| rcr ecx,1 |
| shr edx,1 |
| rcr eax,1 |
| or ebx,ebx |
| jne L5 |
| div ecx |
| mov esi,eax |
| mul dword ptr [esp+1Ch] |
| mov ecx,eax |
| mov eax,dword ptr [esp+18h] |
| mul esi |
| add edx,ecx |
| jb L6 |
| cmp edx,dword ptr [esp+14h] |
| ja L6 |
| jb L7 |
| cmp eax,dword ptr [esp+10h] |
| jbe L7 |
| L6: |
| dec esi |
| sub eax,dword ptr [esp+18h] |
| sbb edx,dword ptr [esp+1Ch] |
| L7: |
| xor ebx,ebx |
| L4: |
| sub eax,dword ptr [esp+10h] |
| sbb edx,dword ptr [esp+14h] |
| dec ebp |
| jns L9 |
| neg edx |
| neg eax |
| sbb edx,0 |
| L9: |
| mov ecx,edx |
| mov edx,ebx |
| mov ebx,ecx |
| mov ecx,eax |
| mov eax,esi |
| dec edi |
| jne L8 |
| neg edx |
| neg eax |
| sbb edx,0 |
| L8: |
| pop ebp |
| pop esi |
| pop edi |
| ret 10h |
| } |
| /* *INDENT-ON* */ |
| } |
| |
| void |
| __declspec(naked) |
| _aulldvrm() |
| { |
| /* *INDENT-OFF* */ |
| __asm { |
| push esi |
| mov eax,dword ptr [esp+14h] |
| or eax,eax |
| jne L1 |
| mov ecx,dword ptr [esp+10h] |
| mov eax,dword ptr [esp+0Ch] |
| xor edx,edx |
| div ecx |
| mov ebx,eax |
| mov eax,dword ptr [esp+8] |
| div ecx |
| mov esi,eax |
| mov eax,ebx |
| mul dword ptr [esp+10h] |
| mov ecx,eax |
| mov eax,esi |
| mul dword ptr [esp+10h] |
| add edx,ecx |
| jmp L2 |
| L1: |
| mov ecx,eax |
| mov ebx,dword ptr [esp+10h] |
| mov edx,dword ptr [esp+0Ch] |
| mov eax,dword ptr [esp+8] |
| L3: |
| shr ecx,1 |
| rcr ebx,1 |
| shr edx,1 |
| rcr eax,1 |
| or ecx,ecx |
| jne L3 |
| div ebx |
| mov esi,eax |
| mul dword ptr [esp+14h] |
| mov ecx,eax |
| mov eax,dword ptr [esp+10h] |
| mul esi |
| add edx,ecx |
| jb L4 |
| cmp edx,dword ptr [esp+0Ch] |
| ja L4 |
| jb L5 |
| cmp eax,dword ptr [esp+8] |
| jbe L5 |
| L4: |
| dec esi |
| sub eax,dword ptr [esp+10h] |
| sbb edx,dword ptr [esp+14h] |
| L5: |
| xor ebx,ebx |
| L2: |
| sub eax,dword ptr [esp+8] |
| sbb edx,dword ptr [esp+0Ch] |
| neg edx |
| neg eax |
| sbb edx,0 |
| mov ecx,edx |
| mov edx,ebx |
| mov ebx,ecx |
| mov ecx,eax |
| mov eax,esi |
| pop esi |
| ret 10h |
| } |
| /* *INDENT-ON* */ |
| } |
| |
| void |
| __declspec(naked) |
| _allshl() |
| { |
| /* *INDENT-OFF* */ |
| __asm { |
| cmp cl,40h |
| jae RETZERO |
| cmp cl,20h |
| jae MORE32 |
| shld edx,eax,cl |
| shl eax,cl |
| ret |
| MORE32: |
| mov edx,eax |
| xor eax,eax |
| and cl,1Fh |
| shl edx,cl |
| ret |
| RETZERO: |
| xor eax,eax |
| xor edx,edx |
| ret |
| } |
| /* *INDENT-ON* */ |
| } |
| |
| void |
| __declspec(naked) |
| _allshr() |
| { |
| /* *INDENT-OFF* */ |
| __asm { |
| cmp cl,40h |
| jae RETZERO |
| cmp cl,20h |
| jae MORE32 |
| shrd eax,edx,cl |
| sar edx,cl |
| ret |
| MORE32: |
| mov eax,edx |
| xor edx,edx |
| and cl,1Fh |
| sar eax,cl |
| ret |
| RETZERO: |
| xor eax,eax |
| xor edx,edx |
| ret |
| } |
| /* *INDENT-ON* */ |
| } |
| |
| void |
| __declspec(naked) |
| _aullshr() |
| { |
| /* *INDENT-OFF* */ |
| __asm { |
| cmp cl,40h |
| jae RETZERO |
| cmp cl,20h |
| jae MORE32 |
| shrd eax,edx,cl |
| shr edx,cl |
| ret |
| MORE32: |
| mov eax,edx |
| xor edx,edx |
| and cl,1Fh |
| shr eax,cl |
| ret |
| RETZERO: |
| xor eax,eax |
| xor edx,edx |
| ret |
| } |
| /* *INDENT-ON* */ |
| } |
| |
| #endif /* _M_IX86 */ |
| |
| #endif /* MSC_VER */ |
| |
| #endif /* !HAVE_LIBC */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
