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Minor optimization efficiency improvement:

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- Run mem2reg promotion first
  - Only rerun passes if the previous thing changed something


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8490 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-09-12 15:36:03 +00:00
parent 37f92e2568
commit fe7ea0da17
1 changed files with 9 additions and 7 deletions
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16
lib/Transforms/Scalar/ScalarReplAggregates.cpp
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@ -58,12 +58,14 @@ Pass *createScalarReplAggregatesPass() { return new SROA(); }
bool SROA::runOnFunction(Function &F) { bool SROA::runOnFunction(Function &F) {
bool Changed = false, LocalChange; bool Changed = performPromotion(F);
do { while (1) {
LocalChange = performScalarRepl(F); bool LocalChange = performScalarRepl(F);
LocalChange |= performPromotion(F); if (!LocalChange) break; // No need to repromote if no scalarrepl
Changed |= LocalChange; Changed = true;
} while (LocalChange); LocalChange = performPromotion(F);
if (!LocalChange) break; // No need to re-scalarrepl if no promotion
}
return Changed; return Changed;
} }
@ -75,7 +77,7 @@ bool SROA::performPromotion(Function &F) {
BasicBlock &BB = F.getEntryNode(); // Get the entry node for the function BasicBlock &BB = F.getEntryNode(); // Get the entry node for the function
bool Changed = false; bool Changed = false;
while (1) { while (1) {
Allocas.clear(); Allocas.clear();