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aarch64: Simplify the linux runtime cpu detection code

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Skip doing the whole getauxval(AT_HWCAP) if HWCAP_CPUID isn't
defined.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2023-10-23 11:27:29 +03:00
parent ae72412aa8
commit f05948ada4
1 changed files with 1 additions and 5 deletions
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6
libavutil/aarch64/cpu.c
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@ -30,11 +30,9 @@
static int detect_flags(void)
{
int flags = 0;
unsigned long hwcap;
hwcap = getauxval(AT_HWCAP);
#if defined(HWCAP_CPUID)
unsigned long hwcap = getauxval(AT_HWCAP);
// We can check for DOTPROD and I8MM using HWCAP_ASIMDDP and
// HWCAP2_I8MM too, avoiding to read the CPUID registers (which triggers
// a trap, handled by the kernel). However the HWCAP_* defines for these
@ -53,8 +51,6 @@ static int detect_flags(void)
if (((tmp >> 52) & 0xf) == 0x1)
flags |= AV_CPU_FLAG_I8MM;
}
#else
(void)hwcap;
#endif
return flags;