From f47cf93b477c47cb4be00019203b2cd11a94d53d Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Tue, 20 Jul 2021 15:56:42 -0700
Subject: stage2: C backend: fix ret AIR instruction

when operand has 0 runtime bits
---
 src/codegen/c.zig | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

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

diff --git a/src/codegen/c.zig b/src/codegen/c.zig
index 71a0869046..71714cc1b8 100644
--- a/src/codegen/c.zig
+++ b/src/codegen/c.zig
@@ -1006,11 +1006,15 @@ fn airLoad(o: *Object, inst: Air.Inst.Index) !CValue {
 
 fn airRet(o: *Object, inst: Air.Inst.Index) !CValue {
     const un_op = o.air.instructions.items(.data)[inst].un_op;
-    const operand = try o.resolveInst(un_op);
     const writer = o.writer();
-    try writer.writeAll("return ");
-    try o.writeCValue(writer, operand);
-    try writer.writeAll(";\n");
+    if (o.air.typeOf(un_op).hasCodeGenBits()) {
+        const operand = try o.resolveInst(un_op);
+        try writer.writeAll("return ");
+        try o.writeCValue(writer, operand);
+        try writer.writeAll(";\n");
+    } else {
+        try writer.writeAll("return;\n");
+    }
     return CValue.none;
 }
 
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