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std.zig.system.x86: improve AVX10 detection

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Alex Rønne Petersen 2026-01-20 23:35:45 +01:00
parent bbc2b5a6b5
commit a995fd8bed
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1 changed files with 14 additions and 4 deletions
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18
lib/std/zig/system/x86.zig
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@ -499,7 +499,7 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
}
}
if (max_level >= 0x7) {
const has_avx10 = if (max_level >= 0x7) has_avx10: {
leaf = cpuid(0x7, 0);
setFeature(cpu, .fsgsbase, bit(leaf.ebx, 0));
@ -596,6 +596,8 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
setFeature(cpu, .nf, bit(leaf.edx, 21) and has_apx_save);
setFeature(cpu, .cf, bit(leaf.edx, 21) and has_apx_save);
setFeature(cpu, .zu, bit(leaf.edx, 21) and has_apx_save);
break :has_avx10 bit(leaf.edx, 19);
} else {
for ([_]Target.x86.Feature{
.sha512,
@ -627,7 +629,9 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
setFeature(cpu, feat, false);
}
}
} else {
break :has_avx10 false;
} else has_avx10: {
for ([_]Target.x86.Feature{
.fsgsbase,
.sgx,
@ -709,7 +713,9 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
}) |feat| {
setFeature(cpu, feat, false);
}
}
break :has_avx10 false;
};
if (max_level >= 0xD and has_avx_save) {
leaf = cpuid(0xD, 0x1);
@ -755,10 +761,14 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
if (max_level >= 0x24) {
leaf = cpuid(0x24, 0);
setFeature(cpu, .avx10_1, bit(leaf.ebx, 18));
const avx_ver = leaf.ebx & 0xff;
setFeature(cpu, .avx10_1, has_avx10 and avx_ver >= 1);
setFeature(cpu, .avx10_2, has_avx10 and avx_ver >= 2);
} else {
for ([_]Target.x86.Feature{
.avx10_1,
.avx10_2,
}) |feat| {
setFeature(cpu, feat, false);
}