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Replace LoopUnrollPass.cpp's custom code-size estimation code using

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the new common CodeMetrics code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85663 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-10-31 14:54:17 +00:00
parent b56c966019
commit a2aabe38ae
1 changed files with 5 additions and 30 deletions
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35
lib/Transforms/Scalar/LoopUnrollPass.cpp
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@ -16,6 +16,7 @@
#include "llvm/IntrinsicInst.h" #include "llvm/IntrinsicInst.h"
#include "llvm/Transforms/Scalar.h" #include "llvm/Transforms/Scalar.h"
#include "llvm/Analysis/LoopPass.h" #include "llvm/Analysis/LoopPass.h"
#include "llvm/Analysis/InlineCost.h"
#include "llvm/Support/CommandLine.h" #include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h" #include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h" #include "llvm/Support/raw_ostream.h"
@ -76,37 +77,11 @@ Pass *llvm::createLoopUnrollPass() { return new LoopUnroll(); }
/// ApproximateLoopSize - Approximate the size of the loop. /// ApproximateLoopSize - Approximate the size of the loop.
static unsigned ApproximateLoopSize(const Loop *L) { static unsigned ApproximateLoopSize(const Loop *L) {
unsigned Size = 0; CodeMetrics Metrics;
for (Loop::block_iterator I = L->block_begin(), E = L->block_end(); for (Loop::block_iterator I = L->block_begin(), E = L->block_end();
I != E; ++I) { I != E; ++I)
BasicBlock *BB = *I; Metrics.analyzeBasicBlock(*I);
Instruction *Term = BB->getTerminator(); return Metrics.NumInsts;
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) {
if (isa<PHINode>(I) && BB == L->getHeader()) {
// Ignore PHI nodes in the header.
} else if (I->hasOneUse() && I->use_back() == Term) {
// Ignore instructions only used by the loop terminator.
} else if (isa<DbgInfoIntrinsic>(I)) {
// Ignore debug instructions
} else if (isa<GetElementPtrInst>(I) && I->hasOneUse()) {
// Ignore GEP as they generally are subsumed into a load or store.
} else if (isa<CallInst>(I)) {
// Estimate size overhead introduced by call instructions which
// is higher than other instructions. Here 3 and 10 are magic
// numbers that help one isolated test case from PR2067 without
// negatively impacting measured benchmarks.
Size += isa<IntrinsicInst>(I) ? 3 : 10;
} else {
++Size;
}
// TODO: Ignore expressions derived from PHI and constants if inval of phi
// is a constant, or if operation is associative. This will get induction
// variables.
}
}
return Size;
} }
bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) { bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) {