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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2019-01-14 12:12:42 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2019-01-14 12:12:42 +0000 |
| commit | 67610926fc74d03061da2c1ce4c895d17bee236f (patch) | |
| tree | 37448332f8936ea2d271542c7c2518e9f8ef5edb /llvm/lib | |
| parent | 8987d00653a15214c5e21691c139ea8304bc99e6 (diff) | |
| download | bcm5719-llvm-67610926fc74d03061da2c1ce4c895d17bee236f.tar.gz bcm5719-llvm-67610926fc74d03061da2c1ce4c895d17bee236f.zip | |
[DAGCombiner] Add add saturation constant folding tests.
Exposes an issue with sadd_sat for computeOverflowKind, so I've disabled it for now.
llvm-svn: 351057
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 6d828d3972d..580a668100b 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -2207,8 +2207,9 @@ SDValue DAGCombiner::visitADDSAT(SDNode *N) { return N0; // If it cannot overflow, transform into an add. - if (DAG.computeOverflowKind(N0, N1) == SelectionDAG::OFK_Never) - return DAG.getNode(ISD::ADD, DL, VT, N0, N1); + if (Opcode == ISD::UADDSAT) + if (DAG.computeOverflowKind(N0, N1) == SelectionDAG::OFK_Never) + return DAG.getNode(ISD::ADD, DL, VT, N0, N1); return SDValue(); } |
