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Fix problem when using LiveRangeQuery with block entries.

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A value that is live in to a basic block should be returned by valueIn()
in LiveRangeQuery(getMBBStartIdx(MBB)), unless it is a PHI-def which
should be returned by valueDefined() instead.

Current code isn't using this functionality. Future code will.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163990 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-09-16 02:15:33 +00:00
parent 644b3840b9
commit 2131eb4887
1 changed files with 3 additions and 1 deletions
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4
include/llvm/CodeGen/LiveInterval.h
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@ -499,7 +499,9 @@ namespace llvm {
if (I == E)
return;
// Is this an instruction live-in segment?
if (SlotIndex::isEarlierInstr(I->start, Idx)) {
// If Idx is the start index of a basic block, include live-in segments
// that start at Idx.getBaseIndex().
if (I->start <= Idx.getBaseIndex()) {
EarlyVal = I->valno;
EndPoint = I->end;
// Move to the potentially live-out segment.