vendor/llvm/llvm-r72732

1 files changed, 23 insertions, 0 deletions

diff --git a/test/CodeGen/X86/2009-03-23-LinearScanBug.ll b/test/CodeGen/X86/2009-03-23-LinearScanBug.ll
new file mode 100644
index 0000000000000..b5298aee30654
--- /dev/null
+++ b/test/CodeGen/X86/2009-03-23-LinearScanBug.ll
@@ -0,0 +1,23 @@
+; RUN: llvm-as < %s | llc -mtriple=i386-apple-darwin -O0
+
+define fastcc void @optimize_bit_field() nounwind {
+bb4:
+        %a = load i32* null             ; <i32> [#uses=1]
+        %s = load i32* getelementptr (i32* null, i32 1)         ; <i32> [#uses=1]
+        %z = load i32* getelementptr (i32* null, i32 2)         ; <i32> [#uses=1]
+        %r = bitcast i32 0 to i32          ; <i32> [#uses=1]
+        %q = trunc i32 %z to i8            ; <i8> [#uses=1]
+        %b = icmp eq i8 0, %q              ; <i1> [#uses=1]
+        br i1 %b, label %bb73, label %bb72
+
+bb72:      ; preds = %bb4
+        %f = tail call fastcc i32 @gen_lowpart(i32 %r, i32 %a) nounwind              ; <i32> [#uses=1]
+        br label %bb73
+
+bb73:         ; preds = %bb72, %bb4
+        %y = phi i32 [ %f, %bb72 ], [ %s, %bb4 ]          ; <i32> [#uses=1]
+        store i32 %y, i32* getelementptr (i32* null, i32 3)
+        unreachable
+}
+
+declare fastcc i32 @gen_lowpart(i32, i32) nounwind