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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
This commit is contained in:
Dan Gohman 2009-10-28 15:28:02 +00:00
parent 57780dfdfc
commit 14ca753e28
1 changed files with 10 additions and 6 deletions
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16
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -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),