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libFLAC/cpu.c: More refactoring and cleanups 

* Make `FLAC__cpu_xgetbv_x86` private to cpu.c (and rename it to
  `cpu_xgetbv_x86` (it wasn't being used anywhere else).
* Remove `FLAC__cpu_have_cpuid_x86` altogether as it wasn't actually
  being used but that was difficult to tell because of all the #ifdef
  nonsense.
This commit is contained in:
Erik de Castro Lopo 2016-06-26 10:39:18 +10:00
parent 23778a3a60
commit fa24613ad9
2 changed files with 17 additions and 54 deletions
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69
src/libFLAC/cpu.c
View File

@ -143,6 +143,20 @@ static void sigill_handler_sse_os(int signal, siginfo_t *si, void *uc)
}
#endif
#if FLAC__HAS_X86INTRIN
static uint32_t cpu_xgetbv_x86(void)
{
#if (defined _MSC_VER || defined __INTEL_COMPILER) && defined FLAC__AVX_SUPPORTED
return (uint32_t)_xgetbv(0);
#elif defined __GNUC__
uint32_t lo, hi;
asm volatile (".byte 0x0f, 0x01, 0xd0" : "=a"(lo), "=d"(hi) : "c" (0));
return lo;
#else
return 0;
#endif
}
#endif
void FLAC__cpu_info(FLAC__CPUInfo *info)
{
@ -157,10 +171,7 @@ void FLAC__cpu_info(FLAC__CPUInfo *info)
info->type = FLAC__CPUINFO_TYPE_IA32;
#if !defined FLAC__NO_ASM && (defined FLAC__HAS_NASM || FLAC__HAS_X86INTRIN)
info->use_asm = true; /* we assume a minimum of 80386 with FLAC__CPU_IA32 */
#if FLAC__HAS_X86INTRIN
if(!FLAC__cpu_have_cpuid_x86())
return;
#else
#if !FLAC__HAS_X86INTRIN
if(!FLAC__cpu_have_cpuid_asm_ia32())
return;
#endif
@ -327,7 +338,7 @@ void FLAC__cpu_info(FLAC__CPUInfo *info)
*/
#if FLAC__HAS_X86INTRIN
if(info->ia32.avx && ia32_osxsave) {
FLAC__uint32 ecr = FLAC__cpu_xgetbv_x86();
FLAC__uint32 ecr = cpu_xgetbv_x86();
if ((ecr & 0x6) != 0x6)
disable_avx(info);
#ifdef DEBUG
@ -388,7 +399,7 @@ void FLAC__cpu_info(FLAC__CPUInfo *info)
* now have to check for OS support of AVX instructions
*/
if(info->x86.avx && x86_osxsave) {
FLAC__uint32 ecr = FLAC__cpu_xgetbv_x86();
FLAC__uint32 ecr = cpu_xgetbv_x86();
if ((ecr & 0x6) != 0x6)
disable_avx(info);
#ifdef DEBUG
@ -412,39 +423,6 @@ void FLAC__cpu_info(FLAC__CPUInfo *info)
#if (defined FLAC__CPU_IA32 || defined FLAC__CPU_X86_64) && FLAC__HAS_X86INTRIN
FLAC__uint32 FLAC__cpu_have_cpuid_x86(void)
{
#ifdef FLAC__CPU_X86_64
return 1;
#elif 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__ && defined HAVE_CPUID_H
if (__get_cpuid_max(0, 0) != 0)
return 1;
else
return 0;
#else
return 0;
#endif
}
void FLAC__cpu_info_x86(FLAC__uint32 level, FLAC__uint32 *eax, FLAC__uint32 *ebx, FLAC__uint32 *ecx, FLAC__uint32 *edx)
{
#if defined _MSC_VER || defined __INTEL_COMPILER
@ -474,17 +452,4 @@ void FLAC__cpu_info_x86(FLAC__uint32 level, FLAC__uint32 *eax, FLAC__uint32 *ebx
#endif
}
FLAC__uint32 FLAC__cpu_xgetbv_x86(void)
{
#if (defined _MSC_VER || defined __INTEL_COMPILER) && defined FLAC__AVX_SUPPORTED
return (FLAC__uint32)_xgetbv(0);
#elif defined __GNUC__
FLAC__uint32 lo, hi;
asm volatile (".byte 0x0f, 0x01, 0xd0" : "=a"(lo), "=d"(hi) : "c" (0));
return lo;
#else
return 0;
#endif
}
#endif /* (FLAC__CPU_IA32 || FLAC__CPU_X86_64) && FLAC__HAS_X86INTRIN */

2
src/libFLAC/include/private/cpu.h
View File

@ -182,9 +182,7 @@ FLAC__uint32 FLAC__cpu_have_cpuid_asm_ia32(void);
void FLAC__cpu_info_asm_ia32(FLAC__uint32 *flags_edx, FLAC__uint32 *flags_ecx);
# endif
# if (defined FLAC__CPU_IA32 || defined FLAC__CPU_X86_64) && FLAC__HAS_X86INTRIN
FLAC__uint32 FLAC__cpu_have_cpuid_x86(void);
void FLAC__cpu_info_x86(FLAC__uint32 level, FLAC__uint32 *eax, FLAC__uint32 *ebx, FLAC__uint32 *ecx, FLAC__uint32 *edx);
FLAC__uint32 FLAC__cpu_xgetbv_x86(void);
# endif
#endif