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Add statistics on removed switch cases, and fix the phi statistic 

to count the number of phis changed, not the number visited.

llvm-svn: 152425
This commit is contained in:
Duncan Sands 2012-03-09 19:21:15 +00:00
parent f5a0d10c2c
commit 14eb175836
1 changed files with 5 additions and 1 deletions
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6
llvm/lib/Transforms/Scalar/CorrelatedValuePropagation.cpp
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@ -28,6 +28,7 @@ STATISTIC(NumPhis, "Number of phis propagated");
STATISTIC(NumSelects, "Number of selects propagated");
STATISTIC(NumMemAccess, "Number of memory access targets propagated");
STATISTIC(NumCmps, "Number of comparisons propagated");
STATISTIC(NumDeadCases, "Number of switch cases removed");
namespace {
class CorrelatedValuePropagation : public FunctionPass {
@ -111,7 +112,8 @@ bool CorrelatedValuePropagation::processPHI(PHINode *P) {
Changed = true;
}
++NumPhis;
if (Changed)
++NumPhis;
return Changed;
}
@ -233,12 +235,14 @@ bool CorrelatedValuePropagation::processSwitch(SwitchInst *SI) {
// This case never fires - remove it.
CI.getCaseSuccessor()->removePredecessor(BB);
SI->removeCase(CI); // Does not invalidate the iterator.
++NumDeadCases;
Changed = true;
} else if (State == LazyValueInfo::True) {
// This case always fires. Arrange for the switch to be turned into an
// unconditional branch by replacing the switch condition with the case
// value.
SI->setCondition(Case);
NumDeadCases += SI->getNumCases();
Changed = true;
break;
}