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Allow optimizing memcpy and memset where possible 

Modern C runtimes have well optimized memset and memcpy, so use those instead of dispatching into SDL's versions. In addition, some compilers can analyze memset and memcpy calls and directly turn them into optimized assembly.
This commit is contained in:
Sam Lantinga 2024-01-20 08:12:11 -08:00
parent 8d25c2d260
commit 7a069cc4b0
16 changed files with 390 additions and 220 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
VisualC-GDK/SDL/SDL.vcxproj
View File

@ -762,6 +762,9 @@
<ClCompile Include="..\..\src\stdlib\SDL_getenv.c" />
<ClCompile Include="..\..\src\stdlib\SDL_iconv.c" />
<ClCompile Include="..\..\src\stdlib\SDL_malloc.c" />
<ClCompile Include="..\..\src\stdlib\SDL_memcpy.c" />
<ClCompile Include="..\..\src\stdlib\SDL_memmove.c" />
<ClCompile Include="..\..\src\stdlib\SDL_memset.c" />
<ClCompile Include="..\..\src\stdlib\SDL_mslibc.c" />
<MASM Condition="'$(Platform)'=='x64'" Include="..\..\src\stdlib\SDL_mslibc_x64.masm">
<PrecompiledHeader>NotUsing</PrecompiledHeader>

3
VisualC-GDK/SDL/SDL.vcxproj.filters
View File

@ -145,6 +145,9 @@
<ClCompile Include="..\..\src\stdlib\SDL_getenv.c" />
<ClCompile Include="..\..\src\stdlib\SDL_iconv.c" />
<ClCompile Include="..\..\src\stdlib\SDL_malloc.c" />
<ClCompile Include="..\..\src\stdlib\SDL_memcpy.c" />
<ClCompile Include="..\..\src\stdlib\SDL_memmove.c" />
<ClCompile Include="..\..\src\stdlib\SDL_memset.c" />
<ClCompile Include="..\..\src\stdlib\SDL_mslibc.c" />
<ClCompile Include="..\..\src\stdlib\SDL_qsort.c" />
<ClCompile Include="..\..\src\stdlib\SDL_stdlib.c" />

3
VisualC-WinRT/SDL-UWP.vcxproj
View File

@ -424,6 +424,9 @@
<ClCompile Include="..\src\stdlib\SDL_getenv.c" />
<ClCompile Include="..\src\stdlib\SDL_iconv.c" />
<ClCompile Include="..\src\stdlib\SDL_malloc.c" />
<ClCompile Include="..\src\stdlib\SDL_memcpy.c" />
<ClCompile Include="..\src\stdlib\SDL_memmove.c" />
<ClCompile Include="..\src\stdlib\SDL_memset.c" />
<ClCompile Include="..\src\stdlib\SDL_mslibc.c" />
<MASM Condition="'$(Platform)'=='x64'" Include="..\src\stdlib\SDL_mslibc_x64.masm" >
<PrecompiledHeader>NotUsing</PrecompiledHeader>

9
VisualC-WinRT/SDL-UWP.vcxproj.filters
View File

@ -714,6 +714,15 @@
<ClCompile Include="..\src\stdlib\SDL_malloc.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\src\stdlib\SDL_memcpy.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\src\stdlib\SDL_memmove.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\src\stdlib\SDL_memset.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\src\stdlib\SDL_qsort.c">
<Filter>Source Files</Filter>
</ClCompile>

5
VisualC/SDL/SDL.vcxproj
View File

@ -616,8 +616,11 @@
<ClCompile Include="..\..\src\stdlib\SDL_getenv.c" />
<ClCompile Include="..\..\src\stdlib\SDL_iconv.c" />
<ClCompile Include="..\..\src\stdlib\SDL_malloc.c" />
<ClCompile Include="..\..\src\stdlib\SDL_memcpy.c" />
<ClCompile Include="..\..\src\stdlib\SDL_memmove.c" />
<ClCompile Include="..\..\src\stdlib\SDL_memset.c" />
<ClCompile Include="..\..\src\stdlib\SDL_mslibc.c" />
<MASM Condition="'$(Platform)'=='x64'" Include="..\..\src\stdlib\SDL_mslibc_x64.masm" >
<MASM Condition="'$(Platform)'=='x64'" Include="..\..\src\stdlib\SDL_mslibc_x64.masm">
<PrecompiledHeader>NotUsing</PrecompiledHeader>
</MASM>
<ClCompile Include="..\..\src\stdlib\SDL_qsort.c" />

26
VisualC/SDL/SDL.vcxproj.filters
View File

@ -822,6 +822,13 @@
<Filter>render\direct3d12</Filter>
</ClInclude>
<ClInclude Include="..\..\src\hidapi\SDL_hidapi_c.h" />
<ClInclude Include="..\..\src\thread\generic\SDL_sysrwlock_c.h" />
<ClInclude Include="..\..\src\video\yuv2rgb\yuv_rgb_common.h" />
<ClInclude Include="..\..\src\video\yuv2rgb\yuv_rgb_internal.h" />
<ClInclude Include="..\..\src\video\yuv2rgb\yuv_rgb_lsx.h" />
<ClInclude Include="..\..\src\video\yuv2rgb\yuv_rgb_lsx_func.h" />
<ClInclude Include="..\..\src\video\yuv2rgb\yuv_rgb_sse.h" />
<ClInclude Include="..\..\src\video\yuv2rgb\yuv_rgb_std.h" />
</ItemGroup>
<ItemGroup>
<ClCompile Include="..\..\src\audio\wasapi\SDL_wasapi.c" />
@ -1197,9 +1204,6 @@
<ClCompile Include="..\..\src\video\dummy\SDL_nullvideo.c">
<Filter>video\dummy</Filter>
</ClCompile>
<ClCompile Include="..\..\src\video\yuv2rgb\yuv_rgb.c">
<Filter>video\yuv2rgb</Filter>
</ClCompile>
<ClCompile Include="..\..\src\video\windows\SDL_windowsclipboard.c">
<Filter>video\windows</Filter>
</ClCompile>
@ -1281,6 +1285,15 @@
<ClCompile Include="..\..\src\stdlib\SDL_malloc.c">
<Filter>stdlib</Filter>
</ClCompile>
<ClCompile Include="..\..\src\stdlib\SDL_memcpy.c">
<Filter>stdlib</Filter>
</ClCompile>
<ClCompile Include="..\..\src\stdlib\SDL_memmove.c">
<Filter>stdlib</Filter>
</ClCompile>
<ClCompile Include="..\..\src\stdlib\SDL_memset.c">
<Filter>stdlib</Filter>
</ClCompile>
<ClCompile Include="..\..\src\stdlib\SDL_qsort.c">
<Filter>stdlib</Filter>
</ClCompile>
@ -1381,9 +1394,10 @@
<ClCompile Include="..\..\src\stdlib\SDL_mslibc.c">
<Filter>stdlib</Filter>
</ClCompile>
<MASM Include="..\..\src\stdlib\SDL_mslibc_x64.masm">
<Filter>stdlib</Filter>
</MASM>
<ClCompile Include="..\..\src\thread\generic\SDL_sysrwlock.c" />
<ClCompile Include="..\..\src\video\yuv2rgb\yuv_rgb_lsx.c" />
<ClCompile Include="..\..\src\video\yuv2rgb\yuv_rgb_sse.c" />
<ClCompile Include="..\..\src\video\yuv2rgb\yuv_rgb_std.c" />
</ItemGroup>
<ItemGroup>
<ResourceCompile Include="..\..\src\core\windows\version.rc" />

12
Xcode/SDL/SDL.xcodeproj/project.pbxproj
View File

@ -372,6 +372,9 @@
E4F7981C2AD8D85500669F54 /* SDL_dynapi_unsupported.h in Headers */ = {isa = PBXBuildFile; fileRef = E4F7981B2AD8D85500669F54 /* SDL_dynapi_unsupported.h */; };
E4F7981E2AD8D86A00669F54 /* SDL_render_unsupported.c in Sources */ = {isa = PBXBuildFile; fileRef = E4F7981D2AD8D86A00669F54 /* SDL_render_unsupported.c */; };
E4F798202AD8D87F00669F54 /* SDL_video_unsupported.c in Sources */ = {isa = PBXBuildFile; fileRef = E4F7981F2AD8D87F00669F54 /* SDL_video_unsupported.c */; };
F316ABD82B5C3185002EF551 /* SDL_memset.c in Sources */ = {isa = PBXBuildFile; fileRef = F316ABD62B5C3185002EF551 /* SDL_memset.c */; };
F316ABD92B5C3185002EF551 /* SDL_memcpy.c in Sources */ = {isa = PBXBuildFile; fileRef = F316ABD72B5C3185002EF551 /* SDL_memcpy.c */; };
F316ABDB2B5CA721002EF551 /* SDL_memmove.c in Sources */ = {isa = PBXBuildFile; fileRef = F316ABDA2B5CA721002EF551 /* SDL_memmove.c */; };
F31A92C828D4CB39003BFD6A /* SDL_offscreenopengles.h in Headers */ = {isa = PBXBuildFile; fileRef = F31A92C628D4CB39003BFD6A /* SDL_offscreenopengles.h */; };
F31A92D228D4CB39003BFD6A /* SDL_offscreenopengles.c in Sources */ = {isa = PBXBuildFile; fileRef = F31A92C728D4CB39003BFD6A /* SDL_offscreenopengles.c */; };
F32305FF28939F6400E66D30 /* SDL_hidapi_combined.c in Sources */ = {isa = PBXBuildFile; fileRef = F32305FE28939F6400E66D30 /* SDL_hidapi_combined.c */; };
@ -878,6 +881,9 @@
E4F7981B2AD8D85500669F54 /* SDL_dynapi_unsupported.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = SDL_dynapi_unsupported.h; sourceTree = "<group>"; };
E4F7981D2AD8D86A00669F54 /* SDL_render_unsupported.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = SDL_render_unsupported.c; sourceTree = "<group>"; };
E4F7981F2AD8D87F00669F54 /* SDL_video_unsupported.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = SDL_video_unsupported.c; sourceTree = "<group>"; };
F316ABD62B5C3185002EF551 /* SDL_memset.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = SDL_memset.c; sourceTree = "<group>"; };
F316ABD72B5C3185002EF551 /* SDL_memcpy.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = SDL_memcpy.c; sourceTree = "<group>"; };
F316ABDA2B5CA721002EF551 /* SDL_memmove.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = SDL_memmove.c; sourceTree = "<group>"; };
F31A92C628D4CB39003BFD6A /* SDL_offscreenopengles.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = SDL_offscreenopengles.h; sourceTree = "<group>"; };
F31A92C728D4CB39003BFD6A /* SDL_offscreenopengles.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = SDL_offscreenopengles.c; sourceTree = "<group>"; };
F32305FE28939F6400E66D30 /* SDL_hidapi_combined.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = SDL_hidapi_combined.c; sourceTree = "<group>"; };
@ -1941,6 +1947,9 @@
A7D8A8D423E2514000DCD162 /* SDL_getenv.c */,
A7D8A8D323E2514000DCD162 /* SDL_iconv.c */,
A7D8A8D923E2514000DCD162 /* SDL_malloc.c */,
F316ABD72B5C3185002EF551 /* SDL_memcpy.c */,
F316ABDA2B5CA721002EF551 /* SDL_memmove.c */,
F316ABD62B5C3185002EF551 /* SDL_memset.c */,
A7D8A8D723E2514000DCD162 /* SDL_qsort.c */,
A7D8A8D823E2514000DCD162 /* SDL_stdlib.c */,
A7D8A8D523E2514000DCD162 /* SDL_string.c */,
@ -2559,6 +2568,7 @@
A7D8B9DD23E2514400DCD162 /* SDL_blendpoint.c in Sources */,
A7D8B4EE23E2514300DCD162 /* SDL_gamepad.c in Sources */,
E4A568B62AF763940062EEC4 /* SDL_sysmain_callbacks.c in Sources */,
F316ABD82B5C3185002EF551 /* SDL_memset.c in Sources */,
A7D8BA1323E2514400DCD162 /* SDL_render_sw.c in Sources */,
A7D8B42223E2514300DCD162 /* SDL_syssem.c in Sources */,
A7D8B53923E2514300DCD162 /* SDL_hidapi_xbox360.c in Sources */,
@ -2610,6 +2620,7 @@
A7D8B76A23E2514300DCD162 /* SDL_wave.c in Sources */,
5616CA4C252BB2A6005D5928 /* SDL_url.c in Sources */,
A7D8BAD323E2514500DCD162 /* s_tan.c in Sources */,
F316ABDB2B5CA721002EF551 /* SDL_memmove.c in Sources */,
A7D8AA6523E2514000DCD162 /* SDL_hints.c in Sources */,
A7D8B53F23E2514300DCD162 /* SDL_hidapi_ps4.c in Sources */,
F362B91C2B3349E200D30B94 /* SDL_steam_virtual_gamepad.c in Sources */,
@ -2623,6 +2634,7 @@
F395C1B12569C6A000942BFF /* SDL_mfijoystick.m in Sources */,
A7D8B99223E2514400DCD162 /* SDL_shaders_metal.metal in Sources */,
F3990DF52A787C10000D8759 /* SDL_sysurl.m in Sources */,
F316ABD92B5C3185002EF551 /* SDL_memcpy.c in Sources */,
A7D8B97A23E2514400DCD162 /* SDL_render.c in Sources */,
A7D8ABD323E2514100DCD162 /* SDL_stretch.c in Sources */,
A7D8BAFD23E2514500DCD162 /* s_floor.c in Sources */,

3
docs/README-migration.md
View File

@ -1249,6 +1249,9 @@ M_PI is no longer defined in SDL_stdinc.h, you can use the new symbols SDL_PI_D
The following functions have been renamed:
* SDL_strtokr() => SDL_strtok_r()
The following functions have been removed:
* SDL_memcpy4()
## SDL_surface.h
The userdata member of SDL_Surface has been replaced with a more general properties interface, which can be queried with SDL_GetSurfaceProperties()

54
include/SDL3/SDL_stdinc.h
View File

@ -522,22 +522,45 @@ extern DECLSPEC int SDLCALL SDL_tolower(int x);
extern DECLSPEC Uint16 SDLCALL SDL_crc16(Uint16 crc, const void *data, size_t len);
extern DECLSPEC Uint32 SDLCALL SDL_crc32(Uint32 crc, const void *data, size_t len);
extern DECLSPEC void *SDLCALL SDL_memcpy(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len);
/* Take advantage of compiler optimizations for memcpy */
#ifndef SDL_SLOW_MEMCPY
#ifdef SDL_memcpy
#undef SDL_memcpy
#endif
#define SDL_memcpy memcpy
#endif
#define SDL_copyp(dst, src) \
{ SDL_COMPILE_TIME_ASSERT(SDL_copyp, sizeof (*(dst)) == sizeof (*(src))); } \
SDL_memcpy((dst), (src), sizeof(*(src)))
extern DECLSPEC void *SDLCALL SDL_memmove(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len);
/* Take advantage of compiler optimizations for memmove */
#ifndef SDL_SLOW_MEMMOVE
#ifdef SDL_memmove
#undef SDL_memmove
#endif
#define SDL_memmove memmove
#endif
extern DECLSPEC void *SDLCALL SDL_memset(SDL_OUT_BYTECAP(len) void *dst, int c, size_t len);
extern DECLSPEC void *SDLCALL SDL_memset4(void *dst, Uint32 val, size_t dwords);
/* Take advantage of compiler optimizations for memset */
#ifndef SDL_SLOW_MEMSET
#ifdef SDL_memset
#undef SDL_memset
#endif
#define SDL_memset memset
#endif
#define SDL_zero(x) SDL_memset(&(x), 0, sizeof((x)))
#define SDL_zerop(x) SDL_memset((x), 0, sizeof(*(x)))
#define SDL_zeroa(x) SDL_memset((x), 0, sizeof((x)))
#define SDL_copyp(dst, src) \
{ SDL_COMPILE_TIME_ASSERT(SDL_copyp, sizeof (*(dst)) == sizeof (*(src))); } \
SDL_memcpy((dst), (src), sizeof (*(src)))
extern DECLSPEC void *SDLCALL SDL_memcpy(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len);
extern DECLSPEC void *SDLCALL SDL_memmove(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len);
extern DECLSPEC int SDLCALL SDL_memcmp(const void *s1, const void *s2, size_t len);
extern DECLSPEC size_t SDLCALL SDL_wcslen(const wchar_t *wstr);
@ -730,9 +753,15 @@ size_t wcslcat(wchar_t *dst, const wchar_t *src, size_t size);
#define SDL_calloc calloc
#define SDL_realloc realloc
#define SDL_free free
#define SDL_memset memset
#ifndef SDL_memcpy
#define SDL_memcpy memcpy
#endif
#ifndef SDL_memmove
#define SDL_memmove memmove
#endif
#ifndef SDL_memset
#define SDL_memset memset
#endif
#define SDL_memcmp memcmp
#define SDL_strlcpy strlcpy
#define SDL_strlcat strlcat
@ -759,11 +788,6 @@ size_t wcslcat(wchar_t *dst, const wchar_t *src, size_t size);
#define SDL_vsnprintf vsnprintf
#endif
SDL_FORCE_INLINE void *SDL_memcpy4(SDL_OUT_BYTECAP(dwords*4) void *dst, SDL_IN_BYTECAP(dwords*4) const void *src, size_t dwords)
{
return SDL_memcpy(dst, src, dwords * 4);
}
/**
* If a * b would overflow, return -1. Otherwise store a * b via ret
* and return 0.

3
src/dynapi/SDL_dynapi.c
View File

@ -26,6 +26,9 @@
#if SDL_DYNAMIC_API
#define SDL_DYNAMIC_API_ENVVAR "SDL3_DYNAMIC_API"
#define SDL_SLOW_MEMCPY
#define SDL_SLOW_MEMMOVE
#define SDL_SLOW_MEMSET
#ifdef HAVE_STDIO_H
#include <stdio.h>

99
src/stdlib/SDL_memcpy.c Normal file
View File

@ -0,0 +1,99 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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"
#ifdef SDL_memcpy
#undef SDL_memcpy
#endif
#if SDL_DYNAMIC_API
#define SDL_memcpy SDL_memcpy_REAL
#endif
void *SDL_memcpy(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len)
{
#ifdef __GNUC__
/* Presumably this is well tuned for speed.
On my machine this is twice as fast as the C code below.
*/
return __builtin_memcpy(dst, src, len);
#elif defined(HAVE_MEMCPY)
return memcpy(dst, src, len);
#elif defined(HAVE_BCOPY)
bcopy(src, dst, len);
return dst;
#else
/* GCC 4.9.0 with -O3 will generate movaps instructions with the loop
using Uint32* pointers, so we need to make sure the pointers are
aligned before we loop using them.
*/
if (((uintptr_t)src & 0x3) || ((uintptr_t)dst & 0x3)) {
/* Do an unaligned byte copy */
Uint8 *srcp1 = (Uint8 *)src;
Uint8 *dstp1 = (Uint8 *)dst;
while (len--) {
*dstp1++ = *srcp1++;
}
} else {
size_t left = (len % 4);
Uint32 *srcp4, *dstp4;
Uint8 *srcp1, *dstp1;
srcp4 = (Uint32 *)src;
dstp4 = (Uint32 *)dst;
len /= 4;
while (len--) {
*dstp4++ = *srcp4++;
}
srcp1 = (Uint8 *)srcp4;
dstp1 = (Uint8 *)dstp4;
switch (left) {
case 3:
*dstp1++ = *srcp1++;
case 2:
*dstp1++ = *srcp1++;
case 1:
*dstp1++ = *srcp1++;
}
}
return dst;
#endif /* __GNUC__ */
}
/* The optimizer on Visual Studio 2005 and later generates memcpy() and memset() calls.
Always provide it for the SDL3 DLL, but skip it when building static lib w/ static runtime. */
#if defined(_MSC_VER) && (_MSC_VER >= 1400) && (!defined(_MT) || defined(DLL_EXPORT))
/* NOLINTNEXTLINE(readability-redundant-declaration) */
extern void *memcpy(void *dst, const void *src, size_t len);
#ifndef __INTEL_LLVM_COMPILER
#pragma intrinsic(memcpy)
#endif
#ifndef __clang__
#pragma function(memcpy)
#endif
/* NOLINTNEXTLINE(readability-inconsistent-declaration-parameter-name) */
void *memcpy(void *dst, const void *src, size_t len)
{
return SDL_memcpy(dst, src, len);
}
#endif /* (_MSC_VER >= 1400) && (!defined(_MT) || defined(DLL_EXPORT)) */

55
src/stdlib/SDL_memmove.c Normal file
View File

@ -0,0 +1,55 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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"
#ifdef SDL_memmove
#undef SDL_memmove
#endif
#if SDL_DYNAMIC_API
#define SDL_memmove SDL_memmove_REAL
#endif
void *SDL_memmove(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len)
{
#ifdef __GNUC__
/* Presumably this is well tuned for speed. */
return __builtin_memmove(dst, src, len);
#elif defined(HAVE_MEMMOVE)
return memmove(dst, src, len);
#else
char *srcp = (char *)src;
char *dstp = (char *)dst;
if (src < dst) {
srcp += len - 1;
dstp += len - 1;
while (len--) {
*dstp-- = *srcp--;
}
} else {
while (len--) {
*dstp++ = *srcp++;
}
}
return dst;
#endif /* HAVE_MEMMOVE */
}

137
src/stdlib/SDL_memset.c Normal file
View File

@ -0,0 +1,137 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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"
#ifdef SDL_memset
#undef SDL_memset
#endif
#if SDL_DYNAMIC_API
#define SDL_memset SDL_memset_REAL
#endif
void *SDL_memset(SDL_OUT_BYTECAP(len) void *dst, int c, size_t len)
{
#ifdef __GNUC__
return __builtin_memset(dst, c, len);
#elif defined(HAVE_MEMSET)
return memset(dst, c, len);
#else
size_t left;
Uint32 *dstp4;
Uint8 *dstp1 = (Uint8 *)dst;
Uint8 value1;
Uint32 value4;
/* The value used in memset() is a byte, passed as an int */
c &= 0xff;
/* The destination pointer needs to be aligned on a 4-byte boundary to
* execute a 32-bit set. Set first bytes manually if needed until it is
* aligned. */
value1 = (Uint8)c;
while ((uintptr_t)dstp1 & 0x3) {
if (len--) {
*dstp1++ = value1;
} else {
return dst;
}
}
value4 = ((Uint32)c | ((Uint32)c << 8) | ((Uint32)c << 16) | ((Uint32)c << 24));
dstp4 = (Uint32 *)dstp1;
left = (len % 4);
len /= 4;
while (len--) {
*dstp4++ = value4;
}
dstp1 = (Uint8 *)dstp4;
switch (left) {
case 3:
*dstp1++ = value1;
case 2:
*dstp1++ = value1;
case 1:
*dstp1++ = value1;
}
return dst;
#endif /* HAVE_MEMSET */
}
/* Note that memset() is a byte assignment and this is a 32-bit assignment, so they're not directly equivalent. */
void *SDL_memset4(void *dst, Uint32 val, size_t dwords)
{
#if defined(__APPLE__) && defined(HAVE_STRING_H)
memset_pattern4(dst, &val, dwords * 4);
#elif defined(__GNUC__) && defined(__i386__)
int u0, u1, u2;
__asm__ __volatile__(
"cld \n\t"
"rep ; stosl \n\t"
: "=&D"(u0), "=&a"(u1), "=&c"(u2)
: "0"(dst), "1"(val), "2"(SDL_static_cast(Uint32, dwords))
: "memory");
#else
size_t _n = (dwords + 3) / 4;
Uint32 *_p = SDL_static_cast(Uint32 *, dst);
Uint32 _val = (val);
if (dwords == 0) {
return dst;
}
switch (dwords % 4) {
case 0:
do {
*_p++ = _val;
SDL_FALLTHROUGH;
case 3:
*_p++ = _val;
SDL_FALLTHROUGH;
case 2:
*_p++ = _val;
SDL_FALLTHROUGH;
case 1:
*_p++ = _val;
} while (--_n);
}
#endif
return dst;
}
/* The optimizer on Visual Studio 2005 and later generates memcpy() and memset() calls.
Always provide it for the SDL3 DLL, but skip it when building static lib w/ static runtime. */
#if defined(_MSC_VER) && (_MSC_VER >= 1400) && (!defined(_MT) || defined(DLL_EXPORT))
/* NOLINTNEXTLINE(readability-redundant-declaration) */
extern void *memset(void *dst, int c, size_t len);
#ifndef __INTEL_LLVM_COMPILER
#pragma intrinsic(memset)
#endif
#ifndef __clang__
#pragma function(memset)
#endif
/* NOLINTNEXTLINE(readability-inconsistent-declaration-parameter-name) */
void *memset(void *dst, int c, size_t len)
{
return SDL_memset(dst, c, len);
}
#endif /* (_MSC_VER >= 1400) && (!defined(_MT) || defined(DLL_EXPORT)) */

34
src/stdlib/SDL_mslibc.c
View File

@ -33,40 +33,6 @@
__declspec(selectany) int _fltused = 1;
#endif
/* The optimizer on Visual Studio 2005 and later generates memcpy() and memset() calls.
Always provide it for the SDL3 DLL, but skip it when building static lib w/ static runtime. */
#if (_MSC_VER >= 1400) && (!defined(_MT) || defined(DLL_EXPORT))
/* NOLINTNEXTLINE(readability-redundant-declaration) */
extern void *memcpy(void *dst, const void *src, size_t len);
#ifndef __INTEL_LLVM_COMPILER
#pragma intrinsic(memcpy)
#endif
#ifndef __clang__
#pragma function(memcpy)
#endif
/* NOLINTNEXTLINE(readability-inconsistent-declaration-parameter-name) */
void *memcpy(void *dst, const void *src, size_t len)
{
return SDL_memcpy(dst, src, len);
}
/* NOLINTNEXTLINE(readability-redundant-declaration) */
extern void *memset(void *dst, int c, size_t len);
#ifndef __INTEL_LLVM_COMPILER
#pragma intrinsic(memset)
#endif
#ifndef __clang__
#pragma function(memset)
#endif
/* NOLINTNEXTLINE(readability-inconsistent-declaration-parameter-name) */
void *memset(void *dst, int c, size_t len)
{
return SDL_memset(dst, c, len);
}
#endif /* (_MSC_VER >= 1400) && (!defined(_MT) || defined(DLL_EXPORT)) */
#ifdef _M_IX86
/* Float to long */

141
src/stdlib/SDL_stdlib.c
View File

@ -510,147 +510,6 @@ int SDL_toupper(int x) { return ((x) >= 'a') && ((x) <= 'z') ? ('A' + ((x) - 'a'
int SDL_tolower(int x) { return ((x) >= 'A') && ((x) <= 'Z') ? ('a' + ((x) - 'A')) : (x); }
#endif
/* This file contains a portable memcpy manipulation function for SDL */
void *SDL_memcpy(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len)
{
#ifdef __GNUC__
/* Presumably this is well tuned for speed.
On my machine this is twice as fast as the C code below.
*/
return __builtin_memcpy(dst, src, len);
#elif defined(HAVE_MEMCPY)
return memcpy(dst, src, len);
#elif defined(HAVE_BCOPY)
bcopy(src, dst, len);
return dst;
#else
/* GCC 4.9.0 with -O3 will generate movaps instructions with the loop
using Uint32* pointers, so we need to make sure the pointers are
aligned before we loop using them.
*/
if (((uintptr_t)src & 0x3) || ((uintptr_t)dst & 0x3)) {
/* Do an unaligned byte copy */
Uint8 *srcp1 = (Uint8 *)src;
Uint8 *dstp1 = (Uint8 *)dst;
while (len--) {
*dstp1++ = *srcp1++;
}
} else {
size_t left = (len % 4);
Uint32 *srcp4, *dstp4;
Uint8 *srcp1, *dstp1;
srcp4 = (Uint32 *)src;
dstp4 = (Uint32 *)dst;
len /= 4;
while (len--) {
*dstp4++ = *srcp4++;
}
srcp1 = (Uint8 *)srcp4;
dstp1 = (Uint8 *)dstp4;
switch (left) {
case 3:
*dstp1++ = *srcp1++;
case 2:
*dstp1++ = *srcp1++;
case 1:
*dstp1++ = *srcp1++;
}
}
return dst;
#endif /* __GNUC__ */
}
void *SDL_memset(SDL_OUT_BYTECAP(len) void *dst, int c, size_t len)
{
#ifdef HAVE_MEMSET
return memset(dst, c, len);
#else
size_t left;
Uint32 *dstp4;
Uint8 *dstp1 = (Uint8 *)dst;
Uint8 value1;
Uint32 value4;
/* The value used in memset() is a byte, passed as an int */
c &= 0xff;
/* The destination pointer needs to be aligned on a 4-byte boundary to
* execute a 32-bit set. Set first bytes manually if needed until it is
* aligned. */
value1 = (Uint8)c;
while ((uintptr_t)dstp1 & 0x3) {
if (len--) {
*dstp1++ = value1;
} else {
return dst;
}
}
value4 = ((Uint32)c | ((Uint32)c << 8) | ((Uint32)c << 16) | ((Uint32)c << 24));
dstp4 = (Uint32 *)dstp1;
left = (len % 4);
len /= 4;
while (len--) {
*dstp4++ = value4;
}
dstp1 = (Uint8 *)dstp4;
switch (left) {
case 3:
*dstp1++ = value1;
case 2:
*dstp1++ = value1;
case 1:
*dstp1++ = value1;
}
return dst;
#endif /* HAVE_MEMSET */
}
/* Note that memset() is a byte assignment and this is a 32-bit assignment, so they're not directly equivalent. */
void *SDL_memset4(void *dst, Uint32 val, size_t dwords)
{
#if defined(__APPLE__) && defined(HAVE_STRING_H)
memset_pattern4(dst, &val, dwords * 4);
#elif defined(__GNUC__) && defined(__i386__)
int u0, u1, u2;
__asm__ __volatile__(
"cld \n\t"
"rep ; stosl \n\t"
: "=&D"(u0), "=&a"(u1), "=&c"(u2)
: "0"(dst), "1"(val), "2"(SDL_static_cast(Uint32, dwords))
: "memory");
#else
size_t _n = (dwords + 3) / 4;
Uint32 *_p = SDL_static_cast(Uint32 *, dst);
Uint32 _val = (val);
if (dwords == 0) {
return dst;
}
switch (dwords % 4) {
case 0:
do {
*_p++ = _val;
SDL_FALLTHROUGH;
case 3:
*_p++ = _val;
SDL_FALLTHROUGH;
case 2:
*_p++ = _val;
SDL_FALLTHROUGH;
case 1:
*_p++ = _val;
} while (--_n);
}
#endif
return dst;
}
#if defined(HAVE_CTYPE_H) && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
int SDL_isblank(int x)
{

23
src/stdlib/SDL_string.c
View File

@ -325,29 +325,6 @@ static size_t SDL_ScanFloat(const char *text, double *valuep)
}
#endif
void *SDL_memmove(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len)
{
#ifdef HAVE_MEMMOVE
return memmove(dst, src, len);
#else
char *srcp = (char *)src;
char *dstp = (char *)dst;
if (src < dst) {
srcp += len - 1;
dstp += len - 1;
while (len--) {
*dstp-- = *srcp--;
}
} else {
while (len--) {
*dstp++ = *srcp++;
}
}
return dst;
#endif /* HAVE_MEMMOVE */
}
int SDL_memcmp(const void *s1, const void *s2, size_t len)
{
#ifdef __vita__