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authorJakob Stoklund Olesen <stoklund@2pi.dk>2012-09-15 16:29:49 +0000
committerJakob Stoklund Olesen <stoklund@2pi.dk>2012-09-15 16:29:49 +0000
commit9ae03fa69f6bc19acd8043414160320c1da0c3da (patch)
tree7a6204900d95121aceaef0ff50f998f62b6de443 /include/llvm
parent85aadc07d5c5688250b1af6d5bcb3e419fdb8862 (diff)
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Make LiveRangeQuery work for PHIDefs as well.
If a PHI value happens to be live out from the layout predecessor of its def block, the def slot index will be in the middle of the segment: %vreg11 = [192r,240B:0)[352r,416B:2)[416B,496r:1) 0@192r 1@480B-phi %2@352r A LiveRangeQuery for 480 should return NULL from valueIn() since the PHI value is defined at the block entry, not live in to the block. No test case, future code depends on this functionality. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163971 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm')
-rw-r--r--include/llvm/CodeGen/LiveInterval.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/LiveInterval.h b/include/llvm/CodeGen/LiveInterval.h
index d7b8f44..3bce496 100644
--- a/include/llvm/CodeGen/LiveInterval.h
+++ b/include/llvm/CodeGen/LiveInterval.h
@@ -508,6 +508,12 @@ namespace llvm {
if (++I == E)
return;
}
+ // Special case: A PHIDef value can have its def in the middle of a
+ // segment if the value happens to be live out of the layout
+ // predecessor.
+ // Such a value is not live-in.
+ if (EarlyVal->def == Idx.getBaseIndex())
+ EarlyVal = 0;
}
// I now points to the segment that may be live-through, or defined by
// this instr. Ignore segments starting after the current instr.