diff options
| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2017-12-26 14:48:28 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2017-12-26 14:48:28 +0000 |
| commit | 03438cb38e811137a5386d71ccb6379707cf7d52 (patch) | |
| tree | 14e19a9fc50f63176b1e72fdd0cec83f20ec5a51 /lib/CodeGen | |
| parent | d94c9356e78e625c0ba1524c9d6d41b706e20907 (diff) | |
[DAGCombine] Don't combine (and (setne X, 0), (setne X, -1)) --> (setuge (add X, 1), 2) for i1
Reduced from oss-fuzz #4773 test case
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321455 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 388663eb1db..d2b06ec0a4b 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -3577,7 +3577,8 @@ SDValue DAGCombiner::foldLogicOfSetCCs(bool IsAnd, SDValue N0, SDValue N1, // TODO: What is the 'or' equivalent of this fold? // (and (setne X, 0), (setne X, -1)) --> (setuge (add X, 1), 2) - if (IsAnd && LL == RL && CC0 == CC1 && IsInteger && CC0 == ISD::SETNE && + if (IsAnd && LL == RL && CC0 == CC1 && OpVT.getScalarSizeInBits() > 1 && + IsInteger && CC0 == ISD::SETNE && ((isNullConstant(LR) && isAllOnesConstant(RR)) || (isAllOnesConstant(LR) && isNullConstant(RR)))) { SDValue One = DAG.getConstant(1, DL, OpVT); |