Revert "Temporarily Revert "Add basic loop fusion pass.""

The reversion apparently deleted the test/Transforms directory.

Will be re-reverting again.

llvm-svn: 358552

1 files changed, 50 insertions, 0 deletions

diff --git a/llvm/test/Transforms/NewGVN/stale-loop-info.ll b/llvm/test/Transforms/NewGVN/stale-loop-info.ll
new file mode 100644
index 00000000000..6bd7d473c39
--- /dev/null
+++ b/llvm/test/Transforms/NewGVN/stale-loop-info.ll
@@ -0,0 +1,50 @@
+; RUN: opt -loops -newgvn -S < %s | FileCheck %s
+
+; This used to fail with ASAN enabled and if for some reason LoopInfo remained
+; available during GVN.  In this case BasicAA will use LI but
+; MergeBlockIntoPredecessor in GVN failed to update LI.
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+
+%struct.wibble.1028 = type { i32, i32, %struct.barney.881 }
+%struct.barney.881 = type { %struct.zot.882 }
+%struct.zot.882 = type { [64 x i8] }
+
+; Function Attrs: argmemonly
+declare void @snork.1(i8*) local_unnamed_addr #0
+
+define hidden zeroext i1 @eggs(%struct.wibble.1028* %arg, i1 %arg2) unnamed_addr align 2 {
+bb:
+  br i1 %arg2, label %bb14, label %bb3
+
+bb3:                                              ; preds = %bb
+  %tmp = getelementptr inbounds %struct.wibble.1028, %struct.wibble.1028* %arg, i64 0, i32 2, i32 0, i32 0, i64 0
+  %tmp5 = bitcast i8* %tmp to %struct.wibble.1028**
+  br label %bb6
+
+bb6:                                              ; preds = %bb12, %bb3
+  br label %bb7
+
+bb7:                                              ; preds = %bb6
+  br i1 undef, label %bb11, label %bb8
+
+bb8:                                              ; preds = %bb7
+  %tmp9 = load %struct.wibble.1028*, %struct.wibble.1028** %tmp5, align 8
+; CHECK: %tmp9 = load %struct.wibble.1028*, %struct.wibble.1028** %tmp5, align 8
+  %tmp10 = bitcast %struct.wibble.1028* %tmp9 to i8*
+  br label %bb12
+
+bb11:                                             ; preds = %bb7
+  br label %bb12
+
+bb12:                                             ; preds = %bb11, %bb8
+  %tmp13 = phi i8* [ %tmp, %bb11 ], [ %tmp10, %bb8 ]
+  call void @snork.1(i8* %tmp13) #1
+  br label %bb6
+
+bb14:                                             ; preds = %bb
+  ret i1 false
+}
+
+attributes #0 = { argmemonly }
+attributes #1 = { nounwind }