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Better info when debugging vectorizer 

llvm-svn: 192460
This commit is contained in:
Renato Golin 2013-10-11 16:14:39 +00:00
parent ac6950863f
commit dd943a8919
1 changed files with 5 additions and 6 deletions
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11
llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -2745,19 +2745,17 @@ bool LoopVectorizationLegality::canVectorize() {
if (!TheLoop->getExitingBlock())
return false;
unsigned NumBlocks = TheLoop->getNumBlocks();
// We need to have a loop header.
DEBUG(dbgs() << "LV: Found a loop: " <<
TheLoop->getHeader()->getName() << '\n');
// Check if we can if-convert non single-bb loops.
unsigned NumBlocks = TheLoop->getNumBlocks();
if (NumBlocks != 1 && !canVectorizeWithIfConvert()) {
DEBUG(dbgs() << "LV: Can't if-convert the loop.\n");
return false;
}
// We need to have a loop header.
BasicBlock *Latch = TheLoop->getLoopLatch();
DEBUG(dbgs() << "LV: Found a loop: " <<
TheLoop->getHeader()->getName() << '\n');
// ScalarEvolution needs to be able to find the exit count.
const SCEV *ExitCount = SE->getBackedgeTakenCount(TheLoop);
if (ExitCount == SE->getCouldNotCompute()) {
@ -2766,6 +2764,7 @@ bool LoopVectorizationLegality::canVectorize() {
}
// Do not loop-vectorize loops with a tiny trip count.
BasicBlock *Latch = TheLoop->getLoopLatch();
unsigned TC = SE->getSmallConstantTripCount(TheLoop, Latch);
if (TC > 0u && TC < TinyTripCountVectorThreshold) {
DEBUG(dbgs() << "LV: Found a loop with a very small trip count. " <<