diff options
Diffstat (limited to 'gnu/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | gnu/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/gnu/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/gnu/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 6af01423ca1..8203476ed4e 100644 --- a/gnu/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/gnu/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -9904,9 +9904,11 @@ SDValue DAGCombiner::visitTRUNCATE(SDNode *N) { // (trunc adde(X, Y, Carry)) -> (adde trunc(X), trunc(Y), Carry) // (trunc addcarry(X, Y, Carry)) -> (addcarry trunc(X), trunc(Y), Carry) // When the adde's carry is not used. + // Don't make an illegal adde: LegalizeDAG can't expand nor promote it. if ((N0.getOpcode() == ISD::ADDE || N0.getOpcode() == ISD::ADDCARRY) && N0.hasOneUse() && !N0.getNode()->hasAnyUseOfValue(1) && - (!LegalOperations || TLI.isOperationLegal(N0.getOpcode(), VT))) { + ((!LegalOperations && N0.getOpcode() == ISD::ADDCARRY) || + TLI.isOperationLegal(N0.getOpcode(), VT))) { SDLoc SL(N); auto X = DAG.getNode(ISD::TRUNCATE, SL, VT, N0.getOperand(0)); auto Y = DAG.getNode(ISD::TRUNCATE, SL, VT, N0.getOperand(1)); |