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some trivial microoptimizations.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97441 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-03-01 07:43:08 +00:00
parent bd8965a7d9
commit 7d892d6e6d
2 changed files with 18 additions and 9 deletions
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14
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -4736,12 +4736,14 @@ SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
// Delete any nodes that are still dead after adding the uses for the
// new operands.
SmallVector<SDNode *, 16> DeadNodes;
for (SmallPtrSet<SDNode *, 16>::iterator I = DeadNodeSet.begin(),
E = DeadNodeSet.end(); I != E; ++I)
if ((*I)->use_empty())
DeadNodes.push_back(*I);
RemoveDeadNodes(DeadNodes);
if (!DeadNodeSet.empty()) {
SmallVector<SDNode *, 16> DeadNodes;
for (SmallPtrSet<SDNode *, 16>::iterator I = DeadNodeSet.begin(),
E = DeadNodeSet.end(); I != E; ++I)
if ((*I)->use_empty())
DeadNodes.push_back(*I);
RemoveDeadNodes(DeadNodes);
}
if (IP)
CSEMap.InsertNode(N, IP); // Memoize the new node.

13
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -1760,7 +1760,7 @@ SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
case OPC_SwitchOpcode: {
unsigned CurNodeOpcode = N.getOpcode();
unsigned SwitchStart = MatcherIndex-1;
unsigned SwitchStart = MatcherIndex-1; (void)SwitchStart;
unsigned CaseSize;
while (1) {
@ -2060,8 +2060,15 @@ SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
if (EmitNodeInfo & OPFL_FlagOutput)
VTs.push_back(MVT::Flag);
// FIXME: Use faster version for the common 'one VT' case?
SDVTList VTList = CurDAG->getVTList(VTs.data(), VTs.size());
// This is hot code, so optimize the two most common cases of 1 and 2
// results.
SDVTList VTList;
if (VTs.size() == 1)
VTList = CurDAG->getVTList(VTs[0]);
else if (VTs.size() == 2)
VTList = CurDAG->getVTList(VTs[0], VTs[1]);
else
VTList = CurDAG->getVTList(VTs.data(), VTs.size());
// Get the operand list.
unsigned NumOps = MatcherTable[MatcherIndex++];