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cogl/cpu-caps: Build cpuid and xgetbv only for x86_64

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This also adds the cpuid functionality inline and checks for GCC ASM
flag output support.

Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/3226
Fixes: 3bf6de60b ("cogl: Add CPU capability detection helper")
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3488>
This commit is contained in:
Sebastian Wick 2024-01-04 12:59:50 +01:00 committed by Marge Bot
parent 7f1b890df1
commit 985e93f9fa
1 changed files with 28 additions and 5 deletions
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33
cogl/cogl/cogl-cpu-caps.c
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@ -39,10 +39,11 @@
CoglCpuCaps cogl_cpu_caps; CoglCpuCaps cogl_cpu_caps;
#ifdef __x86_64
static inline uint64_t static inline uint64_t
xgetbv (void) xgetbv (void)
{ {
#if defined(__GNUC__) #ifdef __GCC_ASM_FLAG_OUTPUTS__
uint32_t eax, edx; uint32_t eax, edx;
__asm __volatile ( __asm __volatile (
@ -58,13 +59,35 @@ xgetbv (void)
#endif #endif
} }
static inline void
cpuid (uint32_t ax,
uint32_t *p)
{
#ifdef __GCC_ASM_FLAG_OUTPUTS__
__asm __volatile (
"cpuid\n\t"
: "=a" (p[0]),
"=b" (p[1]),
"=c" (p[2]),
"=d" (p[3])
: "0" (ax)
);
#else
p[0] = 0;
p[1] = 0;
p[2] = 0;
p[3] = 0;
#endif
}
#endif
void void
cogl_init_cpu_caps (void) cogl_init_cpu_caps (void)
{ {
#ifdef HAVE_CPUID #ifdef __x86_64
uint32_t regs[4]; uint32_t regs[4];
cpuid(0x00000000, regs); cpuid (0x00000000, regs);
if (regs[0] >= 0x00000001) if (regs[0] >= 0x00000001)
{ {
@ -75,9 +98,9 @@ cogl_init_cpu_caps (void)
has_avx = (((regs2[2] >> 28) & 1) && /* AVX */ has_avx = (((regs2[2] >> 28) & 1) && /* AVX */
((regs2[2] >> 27) & 1) && /* OSXSAVE */ ((regs2[2] >> 27) & 1) && /* OSXSAVE */
((xgetbv() & 6) == 6)); /* XMM & YMM */ ((xgetbv () & 6) == 6)); /* XMM & YMM */
if (((regs2[2] >> 29) & 1) && has_avx) if (((regs2[2] >> 29) & 1) && has_avx)
cpu_caps |= COGL_CPU_CAP_F16C; cogl_cpu_caps |= COGL_CPU_CAP_F16C;
} }
#endif #endif
} }