Forgot this test earlier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77007 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/2009-07-22-LinearScanBug.ll b/test/CodeGen/X86/2009-07-22-LinearScanBug.ll
new file mode 100644 (file)
index 0000000..bfb76fe
--- /dev/null
+++ b/test/CodeGen/X86/2009-07-22-LinearScanBug.ll
@@ -0,0 +1,29 @@
+; RUN: llvm-as < %s | llc -mtriple=i386-pc-mingw32
+; PR4572
+
+       %"struct.std::valarray<unsigned int>" = type { i32, i32* }
+
+define void @_ZSt17__gslice_to_indexjRKSt8valarrayIjES2_RS0_(i32 %__o, %"struct.std::valarray<unsigned int>"* nocapture %__l, %"struct.std::valarray<unsigned int>"* nocapture %__s, %"struct.std::valarray<unsigned int>"* nocapture %__i) nounwind {
+entry:
+       %0 = alloca i32, i32 undef, align 4             ; <i32*> [#uses=1]
+       br i1 undef, label %return, label %bb4
+
+bb4:           ; preds = %bb7.backedge, %entry
+       %indvar = phi i32 [ %indvar.next, %bb7.backedge ], [ 0, %entry ]                ; <i32> [#uses=2]
+       %scevgep24.sum = sub i32 undef, %indvar         ; <i32> [#uses=2]
+       %scevgep25 = getelementptr i32* %0, i32 %scevgep24.sum          ; <i32*> [#uses=1]
+       %scevgep27 = getelementptr i32* undef, i32 %scevgep24.sum               ; <i32*> [#uses=1]
+       %1 = load i32* %scevgep27, align 4              ; <i32> [#uses=0]
+       br i1 undef, label %bb7.backedge, label %bb5
+
+bb5:           ; preds = %bb4
+       store i32 0, i32* %scevgep25, align 4
+       br label %bb7.backedge
+
+bb7.backedge:          ; preds = %bb5, %bb4
+       %indvar.next = add i32 %indvar, 1               ; <i32> [#uses=1]
+       br label %bb4
+
+return:                ; preds = %entry
+       ret void
+}