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Stop computing the number of uses twice per value in CodeGenPrepare's sinking of

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addressing code. On 403.gcc this almost halves CodeGenPrepare time and reduces
total llc time by 9.5%. Unfortunately, getNumUses() is still the hottest function
in llc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126782 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron Zwarich 2011-03-01 21:13:53 +00:00
parent 22a1df6bf2
commit 4c078f0d6d
1 changed files with 4 additions and 3 deletions
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7
lib/Transforms/Scalar/CodeGenPrepare.cpp
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@ -701,7 +701,7 @@ bool CodeGenPrepare::OptimizeMemoryInst(Instruction *MemoryInst, Value *Addr,
// the addressing mode obtained from the non-PHI roots of the graph
// are equivalent.
Value *Consensus = 0;
unsigned NumUses = 0;
unsigned NumUsesConsensus = 0;
SmallVector<Instruction*, 16> AddrModeInsts;
ExtAddrMode AddrMode;
while (!worklist.empty()) {
@ -734,9 +734,10 @@ bool CodeGenPrepare::OptimizeMemoryInst(Instruction *MemoryInst, Value *Addr,
// such root as representative, select the one with the most uses in order
// to keep the cost modeling heuristics in AddressingModeMatcher applicable.
if (!Consensus || NewAddrMode == AddrMode) {
if (V->getNumUses() > NumUses) {
unsigned NumUses = V->getNumUses();
if (NumUses > NumUsesConsensus) {
Consensus = V;
NumUses = V->getNumUses();
NumUsesConsensus = NumUses;
AddrMode = NewAddrMode;
AddrModeInsts = NewAddrModeInsts;
}