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After physreg coalescing, physical registers might not have live ranges where 

you would expect.

Don't assert on that case, just give up.

This fixes PR7513.

llvm-svn: 107046
This commit is contained in:
Jakob Stoklund Olesen 2010-06-28 19:39:57 +00:00
parent 0117091c16
commit ffd628ec0a
1 changed files with 2 additions and 1 deletions
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3
llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -122,7 +122,8 @@ bool SimpleRegisterCoalescing::AdjustCopiesBackFrom(const CoalescerPair &CP,
// AValNo is the value number in A that defines the copy, A3 in the example.
SlotIndex CopyUseIdx = CopyIdx.getUseIndex();
LiveInterval::iterator ALR = IntA.FindLiveRangeContaining(CopyUseIdx);
assert(ALR != IntA.end() && "Live range not found!");
// The live range might not exist after fun with physreg coalescing.
if (ALR == IntA.end()) return false;
VNInfo *AValNo = ALR->valno;
// If it's re-defined by an early clobber somewhere in the live range, then
// it's not safe to eliminate the copy. FIXME: This is a temporary workaround.