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Fix an overly strict assertion. Source register of a copy may not be killed, it may be killed by an implicit super-register use.

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llvm-svn: 55762
This commit is contained in:
Evan Cheng 2008-09-04 05:43:55 +00:00
parent 53ce5fa5ce
commit dcce925eb1
1 changed files with 2 additions and 1 deletions
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3
lib/CodeGen/VirtRegMap.cpp
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@ -1730,7 +1730,8 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
SmallVector<unsigned, 2> KillRegs;
InvalidateKills(MI, RegKills, KillOps, &KillRegs);
if (MO.isDead() && !KillRegs.empty()) {
assert(KillRegs[0] == Dst);
// Source register or an implicit super-register use is killed.
assert(KillRegs[0] == Dst || TRI->isSubRegister(KillRegs[0], Dst));
// Last def is now dead.
TransferDeadness(&MBB, Dist, Src, RegKills, KillOps);
}