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gallium/util: fix nondeterministic avx512 detection

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cpuid.7 requires cx=0 to select the extended feature leaf.

avx512 detection was using the non-indexed cpuid resulting
in random non-detection of avx512.

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
(cherry picked from commit 131b9f644c)
This commit is contained in:
Tim Rowley 2017-07-19 14:18:49 -05:00 • committed by Emil Velikov
parent e0951c67f4
commit 57bf8e1cd8
1 changed files with 1 additions and 1 deletions
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src/gallium/auxiliary/util/u_cpu_detect.c
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@ -393,7 +393,7 @@ util_cpu_detect(void)
(xgetbv() & (0x7 << 5)) && // OPMASK: upper-256 enabled by OS
((xgetbv() & 6) == 6)) { // XMM/YMM enabled by OS
uint32_t regs3[4];
cpuid(0x00000007, regs3);
cpuid_count(0x00000007, 0x00000000, regs3);
util_cpu_caps.has_avx512f = (regs3[1] >> 16) & 1;
util_cpu_caps.has_avx512dq = (regs3[1] >> 17) & 1;
util_cpu_caps.has_avx512ifma = (regs3[1] >> 21) & 1;