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src/libFLAC/ : CPU feature detection improvements.

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CPU detection used to depend on ASM code. Now CPU features are
also detected when only FLAC__HAS_X86INTRIN is defined.

Patch-from: lvqcl <lvqcl.mail@gmail.com>
This commit is contained in:
Erik de Castro Lopo 2014-03-02 21:36:37 +11:00
parent ace63cc828
commit 15e28a4b94
2 changed files with 48 additions and 4 deletions
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51
src/libFLAC/cpu.c
View File

@ -107,7 +107,7 @@ static const unsigned FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXTMMX = 0x00400000;
/*
* Extra stuff needed for detection of OS support for SSE on IA-32
*/
#if defined(FLAC__CPU_IA32) && !defined FLAC__NO_ASM && defined FLAC__HAS_NASM && !defined FLAC__NO_SSE_OS && !defined FLAC__SSE_OS
#if defined(FLAC__CPU_IA32) && !defined FLAC__NO_ASM && (defined FLAC__HAS_NASM || defined FLAC__HAS_X86INTRIN) && !defined FLAC__NO_SSE_OS && !defined FLAC__SSE_OS
# if defined(__linux__)
/*
* If the OS doesn't support SSE, we will get here with a SIGILL. We
@ -162,9 +162,13 @@ void FLAC__cpu_info(FLAC__CPUInfo *info)
*/
#ifdef FLAC__CPU_IA32
info->type = FLAC__CPUINFO_TYPE_IA32;
#if !defined FLAC__NO_ASM && defined FLAC__HAS_NASM
#if !defined FLAC__NO_ASM && (defined FLAC__HAS_NASM || defined FLAC__HAS_X86INTRIN)
info->use_asm = true; /* we assume a minimum of 80386 with FLAC__CPU_IA32 */
#ifdef FLAC__HAS_NASM
info->ia32.cpuid = FLAC__cpu_have_cpuid_asm_ia32()? true : false;
#else
info->ia32.cpuid = FLAC__cpu_have_cpuid_x86()? true : false;
#endif
info->ia32.bswap = info->ia32.cpuid; /* CPUID => BSWAP since it came after */
info->ia32.cmov = false;
info->ia32.mmx = false;
@ -181,7 +185,11 @@ void FLAC__cpu_info(FLAC__CPUInfo *info)
if(info->ia32.cpuid) {
/* http://www.sandpile.org/x86/cpuid.htm */
FLAC__uint32 flags_edx, flags_ecx;
#ifdef FLAC__HAS_NASM
FLAC__cpu_info_asm_ia32(&flags_edx, &flags_ecx);
#else
FLAC__cpu_info_x86(&flags_edx, &flags_ecx);
#endif
info->ia32.cmov = (flags_edx & FLAC__CPUINFO_IA32_CPUID_CMOV )? true : false;
info->ia32.mmx = (flags_edx & FLAC__CPUINFO_IA32_CPUID_MMX )? true : false;
info->ia32.fxsr = (flags_edx & FLAC__CPUINFO_IA32_CPUID_FXSR )? true : false;
@ -192,7 +200,7 @@ void FLAC__cpu_info(FLAC__CPUInfo *info)
info->ia32.sse41 = (flags_ecx & FLAC__CPUINFO_IA32_CPUID_SSE41)? true : false;
info->ia32.sse42 = (flags_ecx & FLAC__CPUINFO_IA32_CPUID_SSE42)? true : false;
#ifdef FLAC__USE_3DNOW
#if defined FLAC__HAS_NASM && defined FLAC__USE_3DNOW
flags_edx = FLAC__cpu_info_extended_amd_asm_ia32();
info->ia32._3dnow = (flags_edx & FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_3DNOW )? true : false;
info->ia32.ext3dnow = (flags_edx & FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXT3DNOW)? true : false;
@ -445,9 +453,44 @@ void FLAC__cpu_info(FLAC__CPUInfo *info)
#if defined _MSC_VER
#include <intrin.h> /* for __cpuid() */
#elif defined __GNUC__
#include <cpuid.h> /* for __get_cpuid() */
#include <cpuid.h> /* for __get_cpuid() and __get_cpuid_max() */
#endif
FLAC__uint32 FLAC__cpu_have_cpuid_x86(void)
{
#ifdef FLAC__CPU_X86_64
return 1;
#else
# if defined _MSC_VER || defined __INTEL_COMPILER /* Do they support CPUs w/o CPUID support (or OSes that work on those CPUs)? */
FLAC__uint32 flags1, flags2;
__asm {
pushfd
pushfd
pop eax
mov flags1, eax
xor eax, 0x200000
push eax
popfd
pushfd
pop eax
mov flags2, eax
popfd
}
if (((flags1^flags2) & 0x200000) != 0)
return 1;
else
return 0;
# elif defined __GNUC__
if (__get_cpuid_max(0, 0) != 0)
return 1;
else
return 0;
# else
return 0;
# endif
#endif
}
void FLAC__cpu_info_x86(FLAC__uint32 *flags_edx, FLAC__uint32 *flags_ecx)
{
#if defined _MSC_VER || defined __INTEL_COMPILER

1
src/libFLAC/include/private/cpu.h
View File

@ -141,6 +141,7 @@ FLAC__uint32 FLAC__cpu_info_extended_amd_asm_ia32(void);
#endif
#if (defined FLAC__CPU_IA32 || defined FLAC__CPU_X86_64) && defined FLAC__HAS_X86INTRIN
FLAC__uint32 FLAC__cpu_have_cpuid_x86(void);
void FLAC__cpu_info_x86(FLAC__uint32 *flags_edx, FLAC__uint32 *flags_ecx);
#endif