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Dead code elimination may separate the live interval into multiple connected components.

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I have convinced myself that it can only happen when a phi value dies. When it
happens, allocate new virtual registers for the components.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127827 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-03-17 20:37:07 +00:00
parent c74513d1b6
commit 6a3dbd3b25
6 changed files with 47 additions and 23 deletions
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4
include/llvm/CodeGen/LiveIntervalAnalysis.h
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@@ -160,7 +160,9 @@ namespace llvm {
/// defs for new uses, and it doesn't remove dead defs.
/// Dead PHIDef values are marked as unused.
/// New dead machine instructions are added to the dead vector.
void shrinkToUses(LiveInterval *li,
/// Return true if the interval may have been separated into multiple
/// connected components.
bool shrinkToUses(LiveInterval *li,
SmallVectorImpl<MachineInstr*> *dead = 0);
// Interval removal