1 files changed, 16 insertions, 0 deletions
diff --git a/test/CodeGen/X86/simple-zext.ll b/test/CodeGen/X86/simple-zext.ll
new file mode 100644
index 0000000..ccd8292
--- /dev/null
+++ b/test/CodeGen/X86/simple-zext.ll
@@ -0,0 +1,16 @@
+; RUN: llc -mtriple=x86_64-apple-darwin < %s| FileCheck %s
+
+; A bug in DAGCombiner prevented it forming a zextload in this simple case
+; because it counted both the chain user and the real user against the
+; profitability total.
+
+define void @load_zext(i32* nocapture %p){
+entry:
+  %0 = load i32* %p, align 4
+  %and = and i32 %0, 255
+  tail call void @use(i32 %and)
+  ret void
+; CHECK: movzbl ({{%r[a-z]+}}), {{%e[a-z]+}}
+}
+
+declare void @use(i32)