[llvm] 6e8e165 - [LoopDeletion] Add test for PR49967 (NFC)
Nikita Popov via llvm-commits
llvm-commits at lists.llvm.org
Sun Apr 18 13:09:26 PDT 2021
Author: Nikita Popov
Date: 2021-04-18T22:08:51+02:00
New Revision: 6e8e165085d4506d3df15da79f70abe1237a26ba
URL: https://github.com/llvm/llvm-project/commit/6e8e165085d4506d3df15da79f70abe1237a26ba
DIFF: https://github.com/llvm/llvm-project/commit/6e8e165085d4506d3df15da79f70abe1237a26ba.diff
LOG: [LoopDeletion] Add test for PR49967 (NFC)
Test case for a SCEV invalidation bug caused by D100264, which
has since been reverted.
Added:
llvm/test/Transforms/LoopDeletion/pr49967.ll
Modified:
Removed:
################################################################################
diff --git a/llvm/test/Transforms/LoopDeletion/pr49967.ll b/llvm/test/Transforms/LoopDeletion/pr49967.ll
new file mode 100644
index 0000000000000..754ac31ed7b5b
--- /dev/null
+++ b/llvm/test/Transforms/LoopDeletion/pr49967.ll
@@ -0,0 +1,54 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -S -loop-deletion -enable-new-pm=0 < %s | FileCheck %s
+
+; Make sure this does not crash due to incorrect SCEV invalidation (PR49967).
+
+define void @test() {
+; CHECK-LABEL: @test(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: br label [[VECTOR_PH:%.*]]
+; CHECK: vector.ph:
+; CHECK-NEXT: br label [[FOR_BODY63:%.*]]
+; CHECK: for.cond.cleanup62:
+; CHECK-NEXT: br i1 true, label [[FOR_BODY151_PREHEADER:%.*]], label [[VECTOR_PH]]
+; CHECK: for.body151.preheader:
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP150_LOOPEXIT:%.*]]
+; CHECK: for.body63:
+; CHECK-NEXT: [[I58_010:%.*]] = phi i16 [ 32, [[VECTOR_PH]] ]
+; CHECK-NEXT: store i16 undef, i16* undef, align 1
+; CHECK-NEXT: [[INC89:%.*]] = add nuw nsw i16 [[I58_010]], 1
+; CHECK-NEXT: [[EXITCOND12_NOT:%.*]] = icmp eq i16 [[INC89]], 33
+; CHECK-NEXT: br i1 [[EXITCOND12_NOT]], label [[FOR_COND_CLEANUP62:%.*]], label [[FOR_BODY63_FOR_BODY63_CRIT_EDGE:%.*]]
+; CHECK: for.body63.for.body63_crit_edge:
+; CHECK-NEXT: unreachable
+; CHECK: for.cond.cleanup150.loopexit:
+; CHECK-NEXT: unreachable
+;
+entry:
+ br label %vector.ph
+
+vector.ph: ; preds = %for.cond.cleanup62, %entry
+ br label %for.body63
+
+for.cond.cleanup62: ; preds = %for.body63
+ br i1 true, label %for.body151.preheader, label %vector.ph
+
+for.body151.preheader: ; preds = %for.cond.cleanup62
+ br label %for.body151
+
+for.body63: ; preds = %for.body63, %vector.ph
+ %i58.010 = phi i16 [ 32, %vector.ph ], [ %inc89, %for.body63 ]
+ store i16 undef, i16* undef, align 1
+ %inc89 = add nuw nsw i16 %i58.010, 1
+ %exitcond12.not = icmp eq i16 %inc89, 33
+ br i1 %exitcond12.not, label %for.cond.cleanup62, label %for.body63
+
+for.cond.cleanup150.loopexit: ; preds = %for.body151
+ unreachable
+
+for.body151: ; preds = %for.body151.preheader, %for.body151
+ %i146.29 = phi i16 [ %inc177, %for.body151 ], [ undef, %for.body151.preheader ]
+ %inc177 = add nuw nsw i16 %i146.29, 1
+ %exitcond.not = icmp eq i16 %inc177, 32
+ br i1 %exitcond.not, label %for.cond.cleanup150.loopexit, label %for.body151
+}
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