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[NFC] LoopRotate: do issue debug message when not rotating due to instr count

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It is somewhat problematic to notice this issue otherwise.
This commit is contained in:
Roman Lebedev 2020-03-12 22:45:11 +03:00
parent 073bd0817b
commit 03550daa9f
1 changed files with 7 additions and 1 deletions
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8
lib/Transforms/Utils/LoopRotationUtils.cpp
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@ -314,8 +314,14 @@ bool LoopRotate::rotateLoop(Loop *L, bool SimplifiedLatch) {
L->dump());
return Rotated;
}
if (Metrics.NumInsts > MaxHeaderSize)
if (Metrics.NumInsts > MaxHeaderSize) {
LLVM_DEBUG(dbgs() << "LoopRotation: NOT rotating - contains "
<< Metrics.NumInsts
<< " instructions, which is more than the threshold ("
<< MaxHeaderSize << " instructions): ";
L->dump());
return Rotated;
}
}
// Now, this loop is suitable for rotation.