From 3e3f4229e9c31d57fe0a2ba3844acd682de2df0d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Mon, 3 Aug 2026 21:28:11 +0200
Subject: [PATCH] std.zig.system.x86: add avx512bmm detection

---
 lib/std/zig/system/x86.zig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/std/zig/system/x86.zig b/lib/std/zig/system/x86.zig
index bf15522b9ff999c7b789d4e983148b6022d091d7..0cb778ce391722c22c56d7be8f968d7dc654d169 100644
--- a/lib/std/zig/system/x86.zig
+++ b/lib/std/zig/system/x86.zig
@@ -358,9 +358,11 @@ fn detectNativeFeatures(cpu: *Target.Cpu, os_tag: Target.Os.Tag) void {
 
         // AMD uses a different bit for prefetchi.
         setFeature(cpu, .prefetchi, bit(leaf.eax, 20));
+        setFeature(cpu, .avx512bmm, bit(leaf.eax, 23) and has_avx512_save);
     } else {
         for ([_]Target.x86.Feature{
             .prefetchi,
+            .avx512bmm,
         }) |feat| {
             setFeature(cpu, feat, false);
         }
-- 
2.54.0