From 19691c0b174f283ffe5b6c3fe8533ef458736064 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Wed, 15 Sep 2021 12:37:32 -0700
Subject: stage2: implement `@fence`

---
 src/codegen/c.zig | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'src/codegen/c.zig')

diff --git a/src/codegen/c.zig b/src/codegen/c.zig
index ff49b18f7b..a2e2d7b20d 100644
--- a/src/codegen/c.zig
+++ b/src/codegen/c.zig
@@ -842,6 +842,7 @@ fn genBody(o: *Object, body: []const Air.Inst.Index) error{ AnalysisFail, OutOfM
 
             .breakpoint => try airBreakpoint(o),
             .unreach    => try airUnreach(o),
+            .fence      => try airFence(o, inst),
 
             // TODO use a different strategy for add that communicates to the optimizer
             // that wrapping is UB.
@@ -1439,6 +1440,17 @@ fn airBreakpoint(o: *Object) !CValue {
     return CValue.none;
 }
 
+fn airFence(o: *Object, inst: Air.Inst.Index) !CValue {
+    const atomic_order = o.air.instructions.items(.data)[inst].fence;
+    const writer = o.writer();
+
+    try writer.writeAll("zig_fence(");
+    try writeMemoryOrder(writer, atomic_order);
+    try writer.writeAll(");\n");
+
+    return CValue.none;
+}
+
 fn airUnreach(o: *Object) !CValue {
     try o.writer().writeAll("zig_unreachable();\n");
     return CValue.none;
-- 
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