[PATCH] D145812: [ConstraintElimination] UB reproducer for D145677

[Vitaly Buka via Phabricator via llvm-commits]

vitalybuka created this revision.
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Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D145812

Files:
  llvm/test/Transforms/ConstraintElimination/shl.ll


Index: llvm/test/Transforms/ConstraintElimination/shl.ll
===================================================================
--- llvm/test/Transforms/ConstraintElimination/shl.ll
+++ llvm/test/Transforms/ConstraintElimination/shl.ll
@@ -1275,3 +1275,16 @@
   %shl.cmp = icmp uge i256 %shl.ub, 0
   ret i1 %shl.cmp
 }
+
+define i1 @shl_overflow_4() {
+; CHECK-LABEL: @shl_overflow_4(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[SHL_UB:%.*]] = shl nuw nsw i256 0, 55
+; CHECK-NEXT:    [[SHL_CMP:%.*]] = icmp uge i256 [[SHL_UB]], 0
+; CHECK-NEXT:    ret i1 true
+;
+entry:
+  %shl.ub = shl nuw nsw i256 0, 55
+  %shl.cmp = icmp uge i256 %shl.ub, 0
+  ret i1 %shl.cmp
+}


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