Mercurial > sdl-ios-xcode
view src/cpuinfo/SDL_cpuinfo.c @ 1982:3b4ce57c6215
First shot at new audio data types (int32 and float32).
Notable changes:
- Converters between types are autogenerated. Instead of making multiple
passes over the data with seperate filters for endianess, size, signedness,
etc, converting between data types is always one specialized filter. This
simplifies SDL_BuildAudioCVT(), which otherwise had a million edge cases
with the new types, and makes the actually conversions more CPU cache
friendly. Left a stub for adding specific optimized versions of these
routines (SSE/MMX/Altivec, assembler, etc)
- Autogenerated converters are built by SDL/src/audio/sdlgenaudiocvt.pl. This
does not need to be run unless tweaking the code, and thus doesn't need
integration into the build system.
- Went through all the drivers and tried to weed out all the "Uint16"
references that are better specified with the new SDL_AudioFormat typedef.
- Cleaned out a bunch of hardcoded bitwise magic numbers and replaced them
with new SDL_AUDIO_* macros.
- Added initial float32 and int32 support code. Theoretically, existing
drivers will push these through converters to get the data they want to
feed to the hardware.
Still TODO:
- Optimize and debug new converters.
- Update the CoreAudio backend to accept float32 data directly.
- Other backends, too?
- SDL_LoadWAV() needs to be updated to support int32 and float32 .wav files
(both of which exist and can be generated by 'sox' for testing purposes).
- Update the mixer to handle new datatypes.
- Optionally update SDL_sound and SDL_mixer, etc.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 24 Aug 2006 12:10:46 +0000 |
| parents | c121d94672cb |
| children | 99210400e8b9 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2006 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.h" /* CPU feature detection for SDL */ #include "SDL.h" #include "SDL_cpuinfo.h" #if defined(__MACOSX__) && defined(__ppc__) #include <sys/sysctl.h> /* For AltiVec check */ #elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP #include <signal.h> #include <setjmp.h> #endif #define CPU_HAS_RDTSC 0x00000001 #define CPU_HAS_MMX 0x00000002 #define CPU_HAS_MMXEXT 0x00000004 #define CPU_HAS_3DNOW 0x00000010 #define CPU_HAS_3DNOWEXT 0x00000020 #define CPU_HAS_SSE 0x00000040 #define CPU_HAS_SSE2 0x00000080 #define CPU_HAS_ALTIVEC 0x00000100 #if SDL_ALTIVEC_BLITTERS && HAVE_SETJMP && !__MACOSX__ /* This is the brute force way of detecting instruction sets... the idea is borrowed from the libmpeg2 library - thanks! */ static jmp_buf jmpbuf; static void illegal_instruction(int sig) { longjmp(jmpbuf, 1); } #endif /* HAVE_SETJMP */ static __inline__ int CPU_haveCPUID(void) { int has_CPUID = 0; /* *INDENT-OFF* */ #if defined(__GNUC__) && defined(i386) __asm__ ( " pushfl # Get original EFLAGS \n" " popl %%eax \n" " movl %%eax,%%ecx \n" " xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n" " pushl %%eax # Save new EFLAGS value on stack \n" " popfl # Replace current EFLAGS value \n" " pushfl # Get new EFLAGS \n" " popl %%eax # Store new EFLAGS in EAX \n" " xorl %%ecx,%%eax # Can not toggle ID bit, \n" " jz 1f # Processor=80486 \n" " movl $1,%0 # We have CPUID support \n" "1: \n" : "=m" (has_CPUID) : : "%eax", "%ecx" ); #elif defined(__GNUC__) && defined(__x86_64__) /* Technically, if this is being compiled under __x86_64__ then it has CPUid by definition. But it's nice to be able to prove it. :) */ __asm__ ( " pushfq # Get original EFLAGS \n" " popq %%rax \n" " movq %%rax,%%rcx \n" " xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n" " pushq %%rax # Save new EFLAGS value on stack \n" " popfq # Replace current EFLAGS value \n" " pushfq # Get new EFLAGS \n" " popq %%rax # Store new EFLAGS in EAX \n" " xorl %%ecx,%%eax # Can not toggle ID bit, \n" " jz 1f # Processor=80486 \n" " movl $1,%0 # We have CPUID support \n" "1: \n" : "=m" (has_CPUID) : : "%rax", "%rcx" ); #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__) __asm { pushfd ; Get original EFLAGS pop eax mov ecx, eax xor eax, 200000h ; Flip ID bit in EFLAGS push eax ; Save new EFLAGS value on stack popfd ; Replace current EFLAGS value pushfd ; Get new EFLAGS pop eax ; Store new EFLAGS in EAX xor eax, ecx ; Can not toggle ID bit, jz done ; Processor=80486 mov has_CPUID,1 ; We have CPUID support done: } #elif defined(__sun) && defined(__i386) __asm ( " pushfl \n" " popl %eax \n" " movl %eax,%ecx \n" " xorl $0x200000,%eax \n" " pushl %eax \n" " popfl \n" " pushfl \n" " popl %eax \n" " xorl %ecx,%eax \n" " jz 1f \n" " movl $1,-8(%ebp) \n" "1: \n" ); #elif defined(__sun) && defined(__amd64) __asm ( " pushfq \n" " popq %rax \n" " movq %rax,%rcx \n" " xorl $0x200000,%eax \n" " pushq %rax \n" " popfq \n" " pushfq \n" " popq %rax \n" " xorl %ecx,%eax \n" " jz 1f \n" " movl $1,-8(%rbp) \n" "1: \n" ); #endif /* *INDENT-ON* */ return has_CPUID; } static __inline__ int CPU_getCPUIDFeatures(void) { int features = 0; /* *INDENT-OFF* */ #if defined(__GNUC__) && ( defined(i386) || defined(__x86_64__) ) __asm__ ( " movl %%ebx,%%edi\n" " xorl %%eax,%%eax # Set up for CPUID instruction \n" " cpuid # Get and save vendor ID \n" " cmpl $1,%%eax # Make sure 1 is valid input for CPUID\n" " jl 1f # We dont have the CPUID instruction\n" " xorl %%eax,%%eax \n" " incl %%eax \n" " cpuid # Get family/model/stepping/features\n" " movl %%edx,%0 \n" "1: \n" " movl %%edi,%%ebx\n" : "=m" (features) : : "%eax", "%ecx", "%edx", "%edi" ); #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__) __asm { xor eax, eax ; Set up for CPUID instruction cpuid ; Get and save vendor ID cmp eax, 1 ; Make sure 1 is valid input for CPUID jl done ; We dont have the CPUID instruction xor eax, eax inc eax cpuid ; Get family/model/stepping/features mov features, edx done: } #elif defined(__sun) && (defined(__i386) || defined(__amd64)) __asm( " movl %ebx,%edi\n" " xorl %eax,%eax \n" " cpuid \n" " cmpl $1,%eax \n" " jl 1f \n" " xorl %eax,%eax \n" " incl %eax \n" " cpuid \n" #ifdef __i386 " movl %edx,-8(%ebp) \n" #else " movl %edx,-8(%rbp) \n" #endif "1: \n" " movl %edi,%ebx\n" ); #endif /* *INDENT-ON* */ return features; } static __inline__ int CPU_getCPUIDFeaturesExt(void) { int features = 0; /* *INDENT-OFF* */ #if defined(__GNUC__) && (defined(i386) || defined (__x86_64__) ) __asm__ ( " movl %%ebx,%%edi\n" " movl $0x80000000,%%eax # Query for extended functions \n" " cpuid # Get extended function limit \n" " cmpl $0x80000001,%%eax \n" " jl 1f # Nope, we dont have function 800000001h\n" " movl $0x80000001,%%eax # Setup extended function 800000001h\n" " cpuid # and get the information \n" " movl %%edx,%0 \n" "1: \n" " movl %%edi,%%ebx\n" : "=m" (features) : : "%eax", "%ecx", "%edx", "%edi" ); #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__) __asm { mov eax,80000000h ; Query for extended functions cpuid ; Get extended function limit cmp eax,80000001h jl done ; Nope, we dont have function 800000001h mov eax,80000001h ; Setup extended function 800000001h cpuid ; and get the information mov features,edx done: } #elif defined(__sun) && ( defined(__i386) || defined(__amd64) ) __asm ( " movl %ebx,%edi\n" " movl $0x80000000,%eax \n" " cpuid \n" " cmpl $0x80000001,%eax \n" " jl 1f \n" " movl $0x80000001,%eax \n" " cpuid \n" #ifdef __i386 " movl %edx,-8(%ebp) \n" #else " movl %edx,-8(%rbp) \n" #endif "1: \n" " movl %edi,%ebx\n" ); #endif /* *INDENT-ON* */ return features; } static __inline__ int CPU_haveRDTSC(void) { if (CPU_haveCPUID()) { return (CPU_getCPUIDFeatures() & 0x00000010); } return 0; } static __inline__ int CPU_haveMMX(void) { if (CPU_haveCPUID()) { return (CPU_getCPUIDFeatures() & 0x00800000); } return 0; } static __inline__ int CPU_haveMMXExt(void) { if (CPU_haveCPUID()) { return (CPU_getCPUIDFeaturesExt() & 0x00400000); } return 0; } static __inline__ int CPU_have3DNow(void) { if (CPU_haveCPUID()) { return (CPU_getCPUIDFeaturesExt() & 0x80000000); } return 0; } static __inline__ int CPU_have3DNowExt(void) { if (CPU_haveCPUID()) { return (CPU_getCPUIDFeaturesExt() & 0x40000000); } return 0; } static __inline__ int CPU_haveSSE(void) { if (CPU_haveCPUID()) { return (CPU_getCPUIDFeatures() & 0x02000000); } return 0; } static __inline__ int CPU_haveSSE2(void) { if (CPU_haveCPUID()) { return (CPU_getCPUIDFeatures() & 0x04000000); } return 0; } static __inline__ int CPU_haveAltiVec(void) { volatile int altivec = 0; #if defined(__MACOSX__) && defined(__ppc__) int selectors[2] = { CTL_HW, HW_VECTORUNIT }; int hasVectorUnit = 0; size_t length = sizeof(hasVectorUnit); int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0); if (0 == error) altivec = (hasVectorUnit != 0); #elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP void (*handler) (int sig); handler = signal(SIGILL, illegal_instruction); if (setjmp(jmpbuf) == 0) { asm volatile ("mtspr 256, %0\n\t" "vand %%v0, %%v0, %%v0"::"r" (-1)); altivec = 1; } signal(SIGILL, handler); #endif return altivec; } static Uint32 SDL_CPUFeatures = 0xFFFFFFFF; static Uint32 SDL_GetCPUFeatures(void) { if (SDL_CPUFeatures == 0xFFFFFFFF) { SDL_CPUFeatures = 0; if (CPU_haveRDTSC()) { SDL_CPUFeatures |= CPU_HAS_RDTSC; } if (CPU_haveMMX()) { SDL_CPUFeatures |= CPU_HAS_MMX; } if (CPU_haveMMXExt()) { SDL_CPUFeatures |= CPU_HAS_MMXEXT; } if (CPU_have3DNow()) { SDL_CPUFeatures |= CPU_HAS_3DNOW; } if (CPU_have3DNowExt()) { SDL_CPUFeatures |= CPU_HAS_3DNOWEXT; } if (CPU_haveSSE()) { SDL_CPUFeatures |= CPU_HAS_SSE; } if (CPU_haveSSE2()) { SDL_CPUFeatures |= CPU_HAS_SSE2; } if (CPU_haveAltiVec()) { SDL_CPUFeatures |= CPU_HAS_ALTIVEC; } } return SDL_CPUFeatures; } SDL_bool SDL_HasRDTSC(void) { if (SDL_GetCPUFeatures() & CPU_HAS_RDTSC) { return SDL_TRUE; } return SDL_FALSE; } SDL_bool SDL_HasMMX(void) { if (SDL_GetCPUFeatures() & CPU_HAS_MMX) { return SDL_TRUE; } return SDL_FALSE; } SDL_bool SDL_HasMMXExt(void) { if (SDL_GetCPUFeatures() & CPU_HAS_MMXEXT) { return SDL_TRUE; } return SDL_FALSE; } SDL_bool SDL_Has3DNow(void) { if (SDL_GetCPUFeatures() & CPU_HAS_3DNOW) { return SDL_TRUE; } return SDL_FALSE; } SDL_bool SDL_Has3DNowExt(void) { if (SDL_GetCPUFeatures() & CPU_HAS_3DNOWEXT) { return SDL_TRUE; } return SDL_FALSE; } SDL_bool SDL_HasSSE(void) { if (SDL_GetCPUFeatures() & CPU_HAS_SSE) { return SDL_TRUE; } return SDL_FALSE; } SDL_bool SDL_HasSSE2(void) { if (SDL_GetCPUFeatures() & CPU_HAS_SSE2) { return SDL_TRUE; } return SDL_FALSE; } SDL_bool SDL_HasAltiVec(void) { if (SDL_GetCPUFeatures() & CPU_HAS_ALTIVEC) { return SDL_TRUE; } return SDL_FALSE; } #ifdef TEST_MAIN #include <stdio.h> int main() { printf("RDTSC: %d\n", SDL_HasRDTSC()); printf("MMX: %d\n", SDL_HasMMX()); printf("MMXExt: %d\n", SDL_HasMMXExt()); printf("3DNow: %d\n", SDL_Has3DNow()); printf("3DNowExt: %d\n", SDL_Has3DNowExt()); printf("SSE: %d\n", SDL_HasSSE()); printf("SSE2: %d\n", SDL_HasSSE2()); printf("AltiVec: %d\n", SDL_HasAltiVec()); return 0; } #endif /* TEST_MAIN */ /* vi: set ts=4 sw=4 expandtab: */