diff options
| author | Dan Gohman <gohman@apple.com> | 2009-10-28 15:28:02 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-10-28 15:28:02 +0000 |
| commit | 14ca753e28414ae33e40759baf56cba17e778c9c (patch) | |
| tree | fea65f1cd4ca9fc7d75122bc06149fb3d318386b /llvm/lib/CodeGen/SelectionDAG | |
| parent | 57780dfdfc3ec2d05aba1fa95491b51bae15cc8b (diff) | |
| download | bcm5719-llvm-14ca753e28414ae33e40759baf56cba17e778c9c.tar.gz bcm5719-llvm-14ca753e28414ae33e40759baf56cba17e778c9c.zip | |
Don't call SDNode::isPredecessorOf when it isn't necessary. If the load's
chains have no users, they can't be predecessors of the condition.
llvm-svn: 85394
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index b379515480b..ef1ab2728cd 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -5737,8 +5737,10 @@ bool DAGCombiner::SimplifySelectOps(SDNode *TheSelect, SDValue LHS, if (TheSelect->getOpcode() == ISD::SELECT) { // Check that the condition doesn't reach either load. If so, folding // this will induce a cycle into the DAG. - if (!LLD->isPredecessorOf(TheSelect->getOperand(0).getNode()) && - !RLD->isPredecessorOf(TheSelect->getOperand(0).getNode())) { + if ((!LLD->hasAnyUseOfValue(1) || + !LLD->isPredecessorOf(TheSelect->getOperand(0).getNode())) && + (!RLD->hasAnyUseOfValue(1) || + !RLD->isPredecessorOf(TheSelect->getOperand(0).getNode()))) { Addr = DAG.getNode(ISD::SELECT, TheSelect->getDebugLoc(), LLD->getBasePtr().getValueType(), TheSelect->getOperand(0), LLD->getBasePtr(), @@ -5747,10 +5749,12 @@ bool DAGCombiner::SimplifySelectOps(SDNode *TheSelect, SDValue LHS, } else { // Check that the condition doesn't reach either load. If so, folding // this will induce a cycle into the DAG. - if (!LLD->isPredecessorOf(TheSelect->getOperand(0).getNode()) && - !RLD->isPredecessorOf(TheSelect->getOperand(0).getNode()) && - !LLD->isPredecessorOf(TheSelect->getOperand(1).getNode()) && - !RLD->isPredecessorOf(TheSelect->getOperand(1).getNode())) { + if ((!LLD->hasAnyUseOfValue(1) || + (!LLD->isPredecessorOf(TheSelect->getOperand(0).getNode()) && + !LLD->isPredecessorOf(TheSelect->getOperand(1).getNode()))) && + (!RLD->hasAnyUseOfValue(1) || + (!RLD->isPredecessorOf(TheSelect->getOperand(0).getNode()) && + !RLD->isPredecessorOf(TheSelect->getOperand(1).getNode())))) { Addr = DAG.getNode(ISD::SELECT_CC, TheSelect->getDebugLoc(), LLD->getBasePtr().getValueType(), TheSelect->getOperand(0), |
