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[MachineOutliner][NFC] Early exit pruning when candidates don't share an MBB

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There's no way they can overlap in this case.

This can save a few iterations when the candidate is close to the beginning
of a MachineBasicBlock. It's particularly useful when the average length of
a MachineBasicBlock in the program is small.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346682 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jessica Paquette 2018-11-12 17:50:56 +00:00
parent d2e4943808
commit 412b368b3b
1 changed files with 8 additions and 0 deletions
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8
lib/CodeGen/MachineOutliner.cpp
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@ -1215,12 +1215,20 @@ void MachineOutliner::pruneOverlaps(
if (C1.getStartIdx() > MaxCandidateLen)
FarthestPossibleIdx = C1.getStartIdx() - MaxCandidateLen;
MachineBasicBlock *C1MBB = C1.getMBB();
// Compare against the candidates in the list that start at most
// FarthestPossibleIdx indices away from C1. There are at most
// MaxCandidateLen of these.
for (auto Sit = It + 1; Sit != Et; Sit++) {
Candidate &C2 = **Sit;
// If the two candidates don't belong to the same MBB, then we're done.
// Because we sorted the candidates, there's no way that we'd find a
// candidate in C1MBB after this point.
if (C2.getMBB() != C1MBB)
break;
// Is this candidate too far away to overlap?
if (C2.getStartIdx() < FarthestPossibleIdx)
break;