From 0125c27363f8b36d17ce53fee33a7e807c9ce167 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Sun, 9 Aug 2026 16:08:27 +0200
Subject: [PATCH] std.atomic: use rd %ccr, %g0 on sparc v9 in spinLoopHint

---
 lib/std/atomic.zig | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/std/atomic.zig b/lib/std/atomic.zig
index d5a7403b092225c33adf976a68ae7e5021b958e5..814d87ae261a094d74e828de10a89ac8a2c804f2 100644
--- a/lib/std/atomic.zig
+++ b/lib/std/atomic.zig
@@ -408,6 +408,12 @@ pub inline fn spinLoopHint() void {
             asm volatile ("pause");
         },
 
+        .sparc,
+        .sparc64,
+        => if (comptime builtin.cpu.hasAny(.sparc, &.{ .v8plus, .v9 })) {
+            asm volatile ("rd %%ccr, %%g0");
+        },
+
         else => {},
     }
 }
-- 
2.54.0