[llvm] 2ee59f7 - [LoopDeletion] Add test with potentially infinite sub-loop.
Florian Hahn via llvm-commits
llvm-commits at lists.llvm.org
Fri May 28 10:01:13 PDT 2021
Author: Florian Hahn
Date: 2021-05-28T17:45:44+01:00
New Revision: 2ee59f75fea87968087f2bb32a0e7e25573a4f76
URL: https://github.com/llvm/llvm-project/commit/2ee59f75fea87968087f2bb32a0e7e25573a4f76
DIFF: https://github.com/llvm/llvm-project/commit/2ee59f75fea87968087f2bb32a0e7e25573a4f76.diff
LOG: [LoopDeletion] Add test with potentially infinite sub-loop.
Tests for PR50511.
Added:
Modified:
llvm/test/Transforms/LoopDeletion/noop-loops-with-subloops.ll
Removed:
################################################################################
diff --git a/llvm/test/Transforms/LoopDeletion/noop-loops-with-subloops.ll b/llvm/test/Transforms/LoopDeletion/noop-loops-with-subloops.ll
index b7a921a8dd513..f3a10c4e5e37f 100644
--- a/llvm/test/Transforms/LoopDeletion/noop-loops-with-subloops.ll
+++ b/llvm/test/Transforms/LoopDeletion/noop-loops-with-subloops.ll
@@ -153,3 +153,49 @@ outer.latch:
exit:
ret void
}
+
+; The inner loop may not terminate, so we cannot remote it, unless the
+; function/loop is mustprogress. Test case from PR50511.
+define void @inner_loop_may_be_infinite(i1 %c1, i1 %c2) {
+; CHECK-LABEL: @inner_loop_may_be_infinite(
+; CHECK-NEXT: br label [[EXIT:%.*]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+ br label %loop1
+
+loop1:
+ br i1 %c1, label %loop1.latch, label %loop2
+
+loop2:
+ br i1 %c2, label %loop1.latch, label %loop2
+
+loop1.latch:
+ br i1 false, label %loop1, label %exit
+
+exit:
+ ret void
+}
+
+; Similar to @inner_loop_may_be_infinite, but with mustprogress. We can delete
+; both loops.
+define void @inner_loop_may_be_infinite_mustprogress(i1 %c1, i1 %c2) mustprogress {
+; CHECK-LABEL: @inner_loop_may_be_infinite_mustprogress(
+; CHECK-NEXT: br label [[EXIT:%.*]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+ br label %loop1
+
+loop1:
+ br i1 %c1, label %loop1.latch, label %loop2
+
+loop2:
+ br i1 %c2, label %loop1.latch, label %loop2
+
+loop1.latch:
+ br i1 false, label %loop1, label %exit
+
+exit:
+ ret void
+}
More information about the llvm-commits
mailing list