[llvm] fc44da7 - Add test exposing a bug in SimpleLoopUnswitch.
Daniil Suchkov via llvm-commits
llvm-commits at lists.llvm.org
Wed May 27 01:07:28 PDT 2020
Author: Daniil Suchkov
Date: 2020-05-27T15:02:28+07:00
New Revision: fc44da746faab5c0ad20e9de8b8fca43b7c5f408
URL: https://github.com/llvm/llvm-project/commit/fc44da746faab5c0ad20e9de8b8fca43b7c5f408
DIFF: https://github.com/llvm/llvm-project/commit/fc44da746faab5c0ad20e9de8b8fca43b7c5f408.diff
LOG: Add test exposing a bug in SimpleLoopUnswitch.
Added:
llvm/test/Transforms/SimpleLoopUnswitch/dead-blocks-uses-in-unreachablel-blocks.ll
Modified:
Removed:
################################################################################
diff --git a/llvm/test/Transforms/SimpleLoopUnswitch/dead-blocks-uses-in-unreachablel-blocks.ll b/llvm/test/Transforms/SimpleLoopUnswitch/dead-blocks-uses-in-unreachablel-blocks.ll
new file mode 100644
index 000000000000..4dec9a3919aa
--- /dev/null
+++ b/llvm/test/Transforms/SimpleLoopUnswitch/dead-blocks-uses-in-unreachablel-blocks.ll
@@ -0,0 +1,33 @@
+; XFAIL: *
+; REQUIRES: asserts
+; RUN: opt < %s -passes='unswitch<nontrivial>' -disable-output
+; RUN: opt < %s -simple-loop-unswitch -enable-nontrivial-unswitch -disable-output
+
+
+; Make sure we don't crash due to a dangling use of %tmp2 in bb7.
+define void @test.use_in_dead_block(i1 %arg1, i1 %arg2) {
+bb1:
+ br label %bb2
+
+bb2: ; preds = %bb4, %bb1
+ %tmp1 = phi i64 [ 0, %bb4 ], [ 42, %bb1 ]
+ br i1 %arg1, label %bb3, label %bb6
+
+bb3: ; preds = %bb2
+ br i1 %arg2, label %bb5, label %bb4
+
+bb4: ; preds = %bb3
+ %tmp2 = add i32 1, 1
+ br label %bb2
+
+bb5: ; preds = %bb3
+ ret void
+
+bb6: ; preds = %bb2
+ %tmp3 = add i64 %tmp1, 1
+ ret void
+
+bb7: ; No predecessors!
+ %tmp4 = add i32 %tmp2, 1
+ ret void
+}
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