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r64073 commit message is lost. Here it is: 

Right now if the coalesced copy def is dead and its src is a kill, and that
there are now other uses within the live range, the coalescer would mark the
def of the source register as dead. But it should also check if there are
other kills which means the value has other uses not in the live range.

llvm-svn: 64075
This commit is contained in:
Evan Cheng 2009-02-08 08:00:36 +00:00
parent f876bc9388
commit fe014df914
1 changed files with 4 additions and 3 deletions
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7
llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -867,11 +867,12 @@ SimpleRegisterCoalescing::ShortenDeadCopySrcLiveRange(LiveInterval &li,
if (LR->valno->def == RemoveStart) {
// If the def MI defines the val# and this copy is the only kill of the
// val#, then propagate the dead marker.
if (li.isOnlyKill(LR->valno, RemoveEnd)) {
if (!li.isOnlyKill(LR->valno, RemoveEnd))
li.removeKill(LR->valno, RemoveEnd);
else {
PropagateDeadness(li, CopyMI, RemoveStart, li_, tri_);
++numDeadValNo;
} else
li.removeKill(LR->valno, RemoveEnd);
}
}
removeRange(li, RemoveStart, LR->end, li_, tri_);