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Fix 'ghost AVX512' detection on Alder Lake CPUs

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Adds a check for the AVX512F feature bit (cpu_info7[1] & 0x00010000)
before enabling AVX512 features. Alder Lake CPUs can report OS support
for YMM/ZMM but not actually support AVX512F, leading to incorrect
capability detection and crashes.

Bug: libyuv:500318522
Change-Id: I84167ee3fcfc7a2572afba148bbb275bd3ccb1e5
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/7746229
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
This commit is contained in:
Frank Barchard 2026-04-09 16:30:09 -07:00 committed by libyuv LUCI CQ
parent 4f4e1ac553
commit 5b5a2f6b92
1 changed files with 1 additions and 1 deletions
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2
source/cpu_id.cc
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@ -428,7 +428,7 @@ static SAFEBUFFERS int GetCpuFlags(void) {
cpu_info |= ((cpu_amdinfo21[0] & 0x00008000) ? kCpuHasERMS : 0);
// Detect AVX512bw
if ((GetXCR0() & 0xe0) == 0xe0) {
if ((GetXCR0() & 0xe0) == 0xe0 && (cpu_info7[1] & 0x00010000)) {
cpu_info |= ((cpu_info7[1] & 0x40000000) ? kCpuHasAVX512BW : 0) |
((cpu_info7[1] & 0x80000000) ? kCpuHasAVX512VL : 0) |
((cpu_info7[2] & 0x00000002) ? kCpuHasAVX512VBMI : 0) |