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Avoid dereferencing end() in collectInterferingVRegs() when there is no

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interference.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122108 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-12-17 23:16:38 +00:00
parent af24964251
commit 8d12140437
2 changed files with 2 additions and 1 deletions
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1
include/llvm/CodeGen/LiveInterval.h
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@ -250,6 +250,7 @@ namespace llvm {
/// position is in a hole, this method returns an iterator pointing to the
/// LiveRange immediately after the hole.
iterator advanceTo(iterator I, SlotIndex Pos) {
assert(I != end());
if (Pos >= endIndex())
return end();
while (I->end <= Pos) ++I;

2
lib/CodeGen/LiveIntervalUnion.cpp
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@ -238,7 +238,7 @@ collectInterferingVRegs(unsigned MaxInterferingRegs) {
InterferenceResult IR = firstInterference();
LiveInterval::iterator VirtRegEnd = VirtReg->end();
LiveInterval *RecentInterferingVReg = NULL;
while (IR.LiveUnionI.valid()) {
if (IR.VirtRegI != VirtRegEnd) while (IR.LiveUnionI.valid()) {
// Advance the union's iterator to reach an unseen interfering vreg.
do {
if (IR.LiveUnionI.value() == RecentInterferingVReg)