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add a dummy function for determining OS support of SSE instructions

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This commit is contained in:
Josh Coalson 2001-07-18 00:24:46 +00:00
parent a52270e0eb
commit 21aa17ee8e
3 changed files with 25 additions and 2 deletions
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9
src/libFLAC/cpu.c
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@ -43,13 +43,18 @@ void FLAC__cpu_info(FLAC__CPUInfo *info)
info->data.ia32.cmov = (cpuid & FLAC__CPUINFO_IA32_CPUID_CMOV)? true : false;
info->data.ia32.mmx = (cpuid & FLAC__CPUINFO_IA32_CPUID_MMX)? true : false;
info->data.ia32.fxsr = (cpuid & FLAC__CPUINFO_IA32_CPUID_FXSR)? true : false;
info->data.ia32.sse = (cpuid & FLAC__CPUINFO_IA32_CPUID_SSE)? true : false; /* @@@ also need to check for operating system support */
info->data.ia32.sse2 = (cpuid & FLAC__CPUINFO_IA32_CPUID_SSE2)? true : false; /* @@@ also need to check for operating system support */
info->data.ia32.sse = (cpuid & FLAC__CPUINFO_IA32_CPUID_SSE)? true : false;
info->data.ia32.sse2 = (cpuid & FLAC__CPUINFO_IA32_CPUID_SSE2)? true : false; /* @@@ also need to check for operating system support? */
cpuid = FLAC__cpu_info_extended_amd_asm_ia32();
info->data.ia32._3dnow = (cpuid & FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_3DNOW)? true : false;
info->data.ia32.ext3dnow = (cpuid & FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXT3DNOW)? true : false;
info->data.ia32.extmmx = (cpuid & FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXTMMX)? true : false;
#ifndef FLAC__SSE_OS
if(!FLAC__cpu_info_sse_os_asm_ia32()) /* this function currently always returns false */
info->data.ia32.fxsr = info->data.ia32.sse = info->data.ia32.sse2 = false;
#endif
}
#else
info->use_asm = false;

17
src/libFLAC/ia32/cpu_asm.nasm
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@ -22,6 +22,7 @@
cglobal FLAC__cpu_info_asm_ia32
cglobal FLAC__cpu_info_extended_amd_asm_ia32
cglobal FLAC__cpu_info_sse_os_asm_ia32
code_section
@ -80,4 +81,20 @@ cident FLAC__cpu_info_extended_amd_asm_ia32
pop ebx
ret
;WATCHOUT - DO NOT call this function until you have verified CPU support of
; SSE by inspecting the return value from FLAC__cpu_info_asm_ia32
;NOTE - Since we're not in priv level 0 we can't just check CR4 bits 9 & 10,
; so right now we just assume there is no OS support. If you know
; how to write code to trap a #UD exception in nasm so we can implement
; this function correctly, let us know!
cident FLAC__cpu_info_sse_os_asm_ia32
push ebx
mov eax, 1
cpuid
mov eax, 0 ;we would like to 'move eax, cr4'
shr eax, 9
and eax, 3
pop ebx
ret
end

1
src/libFLAC/include/private/cpu.h
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@ -63,6 +63,7 @@ void FLAC__cpu_info(FLAC__CPUInfo *info);
#ifdef FLAC__HAS_NASM
unsigned FLAC__cpu_info_asm_ia32();
unsigned FLAC__cpu_info_extended_amd_asm_ia32();
unsigned FLAC__cpu_info_sse_os_asm_ia32();
#endif
#endif
#endif