From: Tim Rowley Date: Wed, 19 Jul 2017 19:18:49 +0000 (-0500) Subject: gallium/util: fix nondeterministic avx512 detection X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=131b9f644cbe70728ba02878483e22459400bcb4;p=mesa.git gallium/util: fix nondeterministic avx512 detection 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 --- diff --git a/src/gallium/auxiliary/util/u_cpu_detect.c b/src/gallium/auxiliary/util/u_cpu_detect.c index 3d6ccb58223..4e71041bc9a 100644 --- a/src/gallium/auxiliary/util/u_cpu_detect.c +++ b/src/gallium/auxiliary/util/u_cpu_detect.c @@ -438,7 +438,7 @@ 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;