authorgravatar for alex@alexrp.comAlex Rønne Petersen <alex@alexrp.com> 2026-01-20 23:35:45+01:00
committergravatar for alex@alexrp.comAlex Rønne Petersen <alex@alexrp.com> 2026-04-25 21:54:48+02:00
logcb2cb21b31f2a4835822febd926462d97c98794a
tree70a55332d3a3fec606625546b3ed7517886c2d33
parent13c6e227a9eb1c0d05c418132d0562033d695912
signaturebadge-check Signed by SSH key SHA256:7B/LJ7bpR1eX8aCXSr4mtd5M45VMPKcx9zY8e95b5QM

std.zig.system.x86: improve AVX10 detection

1 files changed, 14 insertions(+), 4 deletions(-)

lib/std/zig/system/x86.zig+14-4
......@@ -499,7 +499,7 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
499499 }
500500 }
501501
502 if (max_level >= 0x7) {
502 const has_avx10 = if (max_level >= 0x7) has_avx10: {
503503 leaf = cpuid(0x7, 0);
504504
505505 setFeature(cpu, .fsgsbase, bit(leaf.ebx, 0));
......@@ -596,6 +596,8 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
596596 setFeature(cpu, .nf, bit(leaf.edx, 21) and has_apx_save);
597597 setFeature(cpu, .cf, bit(leaf.edx, 21) and has_apx_save);
598598 setFeature(cpu, .zu, bit(leaf.edx, 21) and has_apx_save);
599
600 break :has_avx10 bit(leaf.edx, 19);
599601 } else {
600602 for ([_]Target.x86.Feature{
601603 .sha512,
......@@ -627,7 +629,9 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
627629 setFeature(cpu, feat, false);
628630 }
629631 }
630 } else {
632
633 break :has_avx10 false;
634 } else has_avx10: {
631635 for ([_]Target.x86.Feature{
632636 .fsgsbase,
633637 .sgx,
......@@ -709,7 +713,9 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
709713 }) |feat| {
710714 setFeature(cpu, feat, false);
711715 }
712 }
716
717 break :has_avx10 false;
718 };
713719
714720 if (max_level >= 0xD and has_avx_save) {
715721 leaf = cpuid(0xD, 0x1);
......@@ -755,10 +761,14 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
755761 if (max_level >= 0x24) {
756762 leaf = cpuid(0x24, 0);
757763
758 setFeature(cpu, .avx10_1, bit(leaf.ebx, 18));
764 const avx_ver = leaf.ebx & 0xff;
765
766 setFeature(cpu, .avx10_1, has_avx10 and avx_ver >= 1);
767 setFeature(cpu, .avx10_2, has_avx10 and avx_ver >= 2);
759768 } else {
760769 for ([_]Target.x86.Feature{
761770 .avx10_1,
771 .avx10_2,
762772 }) |feat| {
763773 setFeature(cpu, feat, false);
764774 }