some trivial microoptimizations.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97441 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index f1e6b96..03cbe22 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -1760,7 +1760,7 @@
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 @@
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++];