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Merge pull request #2542 from Yawning/bug/cpuid-osxsave

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core/sys/info: Workaround extremely rare XGETBV issues
This commit is contained in:
Jeroen van Rijn
2023-05-16 16:07:43 +02:00
committed by GitHub
parent bb4ff84a4a adb4692ce8
commit 3fed1af7df
1 changed files with 8 additions and 1 deletions
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9
core/sys/info/cpu_intel.odin
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@@ -74,8 +74,15 @@ init_cpu_features :: proc "c" () {
return
}
// In certain rare cases (reason unknown), XGETBV generates an
// illegal instruction, even if OSXSAVE is set per CPUID.
//
// When Chrome ran into this problem, the problem went away
// after they started checking both OSXSAVE and XSAVE.
//
// See: crbug.com/375968
os_supports_avx := false
if .os_xsave in set {
if .os_xsave in set && is_set(26, ecx1) {
eax, _ := xgetbv(0)
os_supports_avx = is_set(1, eax) && is_set(2, eax)
}