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std.zig.system.x86: fix prefetchi detection on AMD

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This commit is contained in:
Alex Rønne Petersen
2026-01-20 23:09:53 +01:00
parent 6880b5678a
commit a24eee8390
1 changed files with 17 additions and 3 deletions
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lib/std/zig/system/x86.zig
+17 -3
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@@ -470,6 +470,19 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
}
}
if (max_ext_level >= 0x80000021) {
leaf = cpuid(0x80000021, 0);
// AMD uses a different bit for prefetchi.
setFeature(cpu, .prefetchi, bit(leaf.eax, 20));
} else {
for ([_]Target.x86.Feature{
.prefetchi,
}) |feat| {
setFeature(cpu, feat, false);
}
}
if (max_level >= 0x7) {
leaf = cpuid(0x7, 0);
@@ -555,7 +568,8 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
setFeature(cpu, .avxneconvert, bit(leaf.edx, 5) and has_avx_save);
setFeature(cpu, .amx_complex, bit(leaf.edx, 8) and has_amx_save);
setFeature(cpu, .avxvnniint16, bit(leaf.edx, 10) and has_avx_save);
setFeature(cpu, .prefetchi, bit(leaf.edx, 14));
// This needs to account for prefetchi already being detected above on AMD.
setFeature(cpu, .prefetchi, cpu.has(.x86, .prefetchi) or bit(leaf.edx, 14));
setFeature(cpu, .usermsr, bit(leaf.edx, 15));
// APX
setFeature(cpu, .egpr, bit(leaf.edx, 21));
@@ -581,7 +595,7 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
.avxneconvert,
.amx_complex,
.avxvnniint16,
.prefetchi,
// prefetchi already handled earlier.
.usermsr,
.egpr,
.push2pop2,
@@ -662,7 +676,7 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
.avxneconvert,
.amx_complex,
.avxvnniint16,
.prefetchi,
// prefetchi already handled earlier.
.usermsr,
.egpr,
.push2pop2,