Add a test for i1 zeroext arguments on x86-64. We currently generate code that

conforms to the ABI, but DAGCombine could in theory recognize the sequence of
zext asserts and truncates and generate incorrect code.

llvm-svn: 127754

llvm/test/CodeGen/X86/bool-args-zext.ll

@@ -0,0 +1,23 @@
+; RUN: llc < %s -march=x86-64 | FileCheck %s
+
+; CHECK: @bar1
+; CHECK: movzbl
+; CHECK: callq
+define void @bar1(i1 zeroext %v1) nounwind ssp {
+entry:
+  %conv = zext i1 %v1 to i32
+  %call = tail call i32 (...)* @foo(i32 %conv) nounwind
+  ret void
+}
+
+; CHECK: @bar2
+; CHECK-NOT: movzbl
+; CHECK: callq
+define void @bar2(i8 zeroext %v1) nounwind ssp {
+entry:
+  %conv = zext i8 %v1 to i32
+  %call = tail call i32 (...)* @foo(i32 %conv) nounwind
+  ret void
+}
+
+declare i32 @foo(...)