zig

commit ad055099309d0faeb2725764ec441b1ee847ecbf (tree)
parent 9b86dde7b989172329d02092f42a94889b5b0d94
Author: Andrew Kelley <andrew@ziglang.org>
Date:   Thu, 17 Dec 2020 22:40:53 -0700

std: align(16) main_thread_tls_buffer

Before this change, thread local variables were landmines if LLVM
decided to optimize any writes to them using vector instructions.

Diffstat:
M
lib/std/os/linux/tls.zig
 | 
2
+-

1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/std/os/linux/tls.zig b/lib/std/os/linux/tls.zig
@@ -327,7 +327,7 @@ pub fn prepareTLS(area: []u8) usize {
         if (tls_tp_points_past_tcb) tls_image.data_offset else tls_image.tcb_offset;
 }
 
-var main_thread_tls_buffer: [256]u8 = undefined;
+var main_thread_tls_buffer: [256]u8 align(16) = undefined;
 
 pub fn initStaticTLS() void {
     initTLS();