Add a test for the LSR issue exposed by r125254.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125325 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/LoopStrengthReduce/hoist-parent-preheader.ll b/test/Transforms/LoopStrengthReduce/hoist-parent-preheader.ll
new file mode 100644 (file)
index 0000000..7982fbc
--- /dev/null
+++ b/test/Transforms/LoopStrengthReduce/hoist-parent-preheader.ll
@@ -0,0 +1,32 @@
+; RUN: opt < %s -loop-reduce -verify
+target triple = "x86_64-apple-darwin10"
+
+define void @myquicksort(i8* %a) nounwind ssp {
+entry:
+  br i1 undef, label %loop1, label %return
+
+loop1:                                            ; preds = %bb13.loopexit, %entry
+  %indvar419 = phi i64 [ %indvar.next420, %loop2.exit ], [ 0, %entry ]
+  %tmp474 = shl i64 %indvar419, 2
+  %tmp484 = add i64 %tmp474, 4
+  br label %loop2
+
+loop2:                                            ; preds = %loop1, %loop2.backedge
+  %indvar414 = phi i64 [ %indvar.next415, %loop2.backedge ], [ 0, %loop1 ]
+  %tmp473 = mul i64 %indvar414, -4
+  %tmp485 = add i64 %tmp484, %tmp473
+  %storemerge4 = getelementptr i8* %a, i64 %tmp485
+  %0 = icmp ugt i8* %storemerge4, %a
+  br i1 false, label %loop2.exit, label %loop2.backedge
+
+loop2.backedge:                                   ; preds = %loop2
+  %indvar.next415 = add i64 %indvar414, 1
+  br label %loop2
+
+loop2.exit:                                       ; preds = %loop2
+  %indvar.next420 = add i64 %indvar419, 1
+  br i1 undef, label %loop1, label %return
+
+return:                                           ; preds = %loop2.exit, %entry
+  ret void
+}