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Stack Coloring: Handle the case where END markers come before BEGIN markers properly.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163530 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-09-10 18:51:09 +00:00
parent b8150d8523
commit 6165dba25f
2 changed files with 39 additions and 0 deletions
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12
lib/CodeGen/StackColoring.cpp
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@ -315,6 +315,18 @@ void StackColoring::calculateLocalLiveness() {
LocalLiveOut.reset(BlockLiveness[BB].End);
LocalLiveIn.reset(BlockLiveness[BB].Begin);
// If we have both BEGIN and END markers in the same basic block then
// we know that the BEGIN marker comes after the END, because we already
// handle the case where the BEGIN comes before the END when collecting
// the markers (and building the BEGIN/END vectore).
// Want to enable the LIVE_IN and LIVE_OUT of slots that have both
// BEGIN and END because it means that the value lives before and after
// this basic block.
BitVector LocalEndBegin = BlockLiveness[BB].End;
LocalEndBegin &= BlockLiveness[BB].Begin;
LocalLiveIn |= LocalEndBegin;
LocalLiveOut |= LocalEndBegin;
if (LocalLiveIn.test(BlockLiveness[BB].LiveIn)) {
changed = true;
BlockLiveness[BB].LiveIn |= LocalLiveIn;