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SplitKit: Fix partially live subreg splitting

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Fix thinko/typo in subreg aware liverange splitting logic. I'm not sure
how to write a proper testcase for this. The original problem only
happens on an out-of-tree target. Forcing subreg enabled targets to
spill and split in a predictable way is near impossible.

llvm-svn: 305228
This commit is contained in:
Matthias Braun 2017-06-12 20:30:52 +00:00
parent 54103de7c1
commit b21f8848ef
1 changed files with 1 additions and 2 deletions
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3
lib/CodeGen/SplitKit.cpp
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@ -569,8 +569,7 @@ SlotIndex SplitEditor::buildCopy(unsigned FromReg, unsigned ToReg,
// Greedy heuristic: Keep iterating keeping the best covering subreg index
// each time.
LaneBitmask LanesLeft =
LaneMask & ~(TRI.getSubRegIndexLaneMask(BestCover));
LaneBitmask LanesLeft = LaneMask & ~(TRI.getSubRegIndexLaneMask(BestIdx));
while (LanesLeft.any()) {
unsigned BestIdx = 0;
int BestCover = INT_MIN;