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switch LegalizedNodes from std::map to a DenseMap. This speeds up isel

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time as a whole on kc++ by 11%.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33857 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-02-04 00:50:02 +00:00
parent 28f72279f5
commit 718071c476
1 changed files with 15 additions and 3 deletions
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18
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -39,6 +39,18 @@ ViewLegalizeDAGs("view-legalize-dags", cl::Hidden,
static const bool ViewLegalizeDAGs = 0;
#endif
namespace llvm {
template<>
struct DenseMapKeyInfo<SDOperand> {
static inline SDOperand getEmptyKey() { return SDOperand((SDNode*)-1, -1U); }
static inline SDOperand getTombstoneKey() { return SDOperand((SDNode*)-1, 0);}
static unsigned getHashValue(const SDOperand &Val) {
return DenseMapKeyInfo<void*>::getHashValue(Val.Val) + Val.ResNo;
}
static bool isPod() { return true; }
};
}
//===----------------------------------------------------------------------===//
/// SelectionDAGLegalize - This takes an arbitrary SelectionDAG as input and
/// hacks on it until the target machine can handle it. This involves
@ -82,7 +94,7 @@ class VISIBILITY_HIDDEN SelectionDAGLegalize {
/// LegalizedNodes - For nodes that are of legal width, and that have more
/// than one use, this map indicates what regularized operand to use. This
/// allows us to avoid legalizing the same thing more than once.
std::map<SDOperand, SDOperand> LegalizedNodes;
DenseMap<SDOperand, SDOperand> LegalizedNodes;
/// PromotedNodes - For nodes that are below legal width, and that have more
/// than one use, this map indicates what promoted value to use. This allows
@ -592,7 +604,7 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
// Note that LegalizeOp may be reentered even from single-use nodes, which
// means that we always must cache transformed nodes.
std::map<SDOperand, SDOperand>::iterator I = LegalizedNodes.find(Op);
DenseMap<SDOperand, SDOperand>::iterator I = LegalizedNodes.find(Op);
if (I != LegalizedNodes.end()) return I->second;
SDOperand Tmp1, Tmp2, Tmp3, Tmp4;
@ -1169,7 +1181,7 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
// will cause this node to be legalized as well as handling libcalls right.
if (LastCALLSEQ_END.Val != Node) {
LegalizeOp(SDOperand(FindCallStartFromCallEnd(Node), 0));
std::map<SDOperand, SDOperand>::iterator I = LegalizedNodes.find(Op);
DenseMap<SDOperand, SDOperand>::iterator I = LegalizedNodes.find(Op);
assert(I != LegalizedNodes.end() &&
"Legalizing the call start should have legalized this node!");
return I->second;