From 08d6876d20303458a4a108300d5a2492e8bd7856 Mon Sep 17 00:00:00 2001
From: Jacob G-W <jacoblevgw@gmail.com>
Date: Thu, 11 Nov 2021 14:26:44 -0500
Subject: [PATCH] c codegen: fix airIsNull with pointers

---
 src/codegen/c.zig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/codegen/c.zig b/src/codegen/c.zig
index 16828ecb82..c00b0247bb 100644
--- a/src/codegen/c.zig
+++ b/src/codegen/c.zig
@@ -2165,7 +2165,10 @@ fn airIsNull(
 
     const ty = f.air.typeOf(un_op);
     var opt_buf: Type.Payload.ElemType = undefined;
-    const payload_type = ty.optionalChild(&opt_buf);
+    const payload_type = if (ty.zigTypeTag() == .Pointer)
+        ty.childType().optionalChild(&opt_buf)
+    else
+        ty.optionalChild(&opt_buf);
 
     if (ty.isPtrLikeOptional()) {
         // operand is a regular pointer, test `operand !=/== NULL`