NewGVN: Fix PR 33461, caused by slightly overzealous verification.

llvm-svn: 305657

1 files changed, 36 insertions, 0 deletions

diff --git a/llvm/test/Transforms/NewGVN/pr33461.ll b/llvm/test/Transforms/NewGVN/pr33461.ll
new file mode 100644
index 00000000000..0a41d6834a4
--- /dev/null
+++ b/llvm/test/Transforms/NewGVN/pr33461.ll
@@ -0,0 +1,36 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+;; Ensure the store verifier is not overzealous
+; RUN: opt -newgvn -S %s | FileCheck %s
+@b = external global i16, align 2
+
+define void @patatino() {
+; CHECK-LABEL: @patatino(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 false, label [[FOR_COND1:%.*]], label [[FOR_INC:%.*]]
+; CHECK:       for.cond1:
+; CHECK-NEXT:    [[TMP0:%.*]] = phi i16 [ [[INC:%.*]], [[FOR_INC]] ], [ undef, [[ENTRY:%.*]] ]
+; CHECK-NEXT:    store i16 [[TMP0]], i16* @b, align 2
+; CHECK-NEXT:    br label [[FOR_INC]]
+; CHECK:       for.inc:
+; CHECK-NEXT:    [[TMP1:%.*]] = load i16, i16* @b, align 2
+; CHECK-NEXT:    [[INC]] = add i16 [[TMP1]], 1
+; CHECK-NEXT:    store i16 [[INC]], i16* @b, align 2
+; CHECK-NEXT:    br label [[FOR_COND1]]
+;
+entry:
+  br i1 false, label %for.cond1, label %for.inc
+
+for.cond1:
+  %e.0 = phi i16* [ %e.1, %for.inc ], [ null, %entry ]
+  %0 = load i16, i16* %e.0, align 2
+  %add = add i16 %0, 0
+  store i16 %add, i16* %e.0, align 2
+  br label %for.inc
+
+for.inc:
+  %e.1 = phi i16* [ %e.0, %for.cond1 ], [ @b, %entry ]
+  %1 = load i16, i16* @b, align 2
+  %inc = add i16 %1, 1
+  store i16 %inc, i16* @b, align 2
+  br label %for.cond1
+}