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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-08-03 20:10:24 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-08-03 20:10:24 +0000 |
| commit | 0ab7103e06ee1da7bde5b196a68be77ab49a005d (patch) | |
| tree | b43967a87c6c80bd83fdcfcc8bd2c48da2dd95d8 /include/llvm/CodeGen/LiveIntervalAnalysis.h | |
| parent | 09a887345f283f3ffb46a36e78ca761026ab0cf2 (diff) | |
| download | llvm-0ab7103e06ee1da7bde5b196a68be77ab49a005d.tar.gz llvm-0ab7103e06ee1da7bde5b196a68be77ab49a005d.tar.bz2 llvm-0ab7103e06ee1da7bde5b196a68be77ab49a005d.tar.xz | |
Make the hasPHIKills flag a computed property.
The VNInfo::HAS_PHI_KILL is only half supported. We precompute it in
LiveIntervalAnalysis, but it isn't properly updated by live range
splitting and functions like shrinkToUses().
It is only used in one place: RegisterCoalescer::removeCopyByCommutingDef().
This patch changes that function to use a new LiveIntervals::hasPHIKill()
function that computes the flag for a given value number.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161254 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm/CodeGen/LiveIntervalAnalysis.h')
| -rw-r--r-- | include/llvm/CodeGen/LiveIntervalAnalysis.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/LiveIntervalAnalysis.h b/include/llvm/CodeGen/LiveIntervalAnalysis.h index abeb0fbf81..da521dbc53 100644 --- a/include/llvm/CodeGen/LiveIntervalAnalysis.h +++ b/include/llvm/CodeGen/LiveIntervalAnalysis.h @@ -246,6 +246,10 @@ namespace llvm { /// return NULL. MachineBasicBlock *intervalIsInOneMBB(const LiveInterval &LI) const; + /// Returns true if VNI is killed by any PHI-def values in LI. + /// This may conservatively return true to avoid expensive computations. + bool hasPHIKill(const LiveInterval &LI, const VNInfo *VNI) const; + /// addKillFlags - Add kill flags to any instruction that kills a virtual /// register. void addKillFlags(); |