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LiveIntervalAnalysis: Update SubRanges in shrinkToUses().

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223880 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2014-12-10 01:12:18 +00:00
parent 6cdf1d9a8f
commit e59399c28c
2 changed files with 160 additions and 80 deletions
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19
include/llvm/CodeGen/LiveIntervalAnalysis.h
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@@ -393,14 +393,17 @@ namespace llvm {
/// Compute RegMaskSlots and RegMaskBits.
void computeRegMasks();
/// \brief Walk the values in the given interval and compute which ones
/// are dead. Dead values are not deleted, however:
/// \brief Walk the values in the @p LR live range and compute which ones
/// are dead in live range @p Segments. Dead values are not deleted,
/// however:
/// - Dead PHIDef values are marked as unused.
/// - New dead machine instructions are added to the dead vector.
/// - if @p dead != nullptr then dead operands are marked as such and
/// completely dead machine instructions are added to the @p dead vector.
/// - CanSeparate is set to true if the interval may have been separated
/// into multiple connected components.
void computeDeadValues(LiveInterval *li, LiveRange &LR, bool *CanSeparate,
SmallVectorImpl<MachineInstr*> *dead);
void computeDeadValues(LiveRange &Segments, LiveRange &LR,
bool *CanSeparate = nullptr, unsigned Reg = 0,
SmallVectorImpl<MachineInstr*> *dead = nullptr);
static LiveInterval* createInterval(unsigned Reg);
@@ -411,6 +414,12 @@ namespace llvm {
void computeRegUnitRange(LiveRange&, unsigned Unit);
void computeVirtRegInterval(LiveInterval&);
/// Specialized version of
/// shrinkToUses(LiveInterval *li, SmallVectorImpl<MachineInstr*> *dead)
/// that works on a subregister live range and only looks at uses matching
/// the lane mask of the subregister range.
bool shrinkToUses(LiveInterval::SubRange &SR, unsigned Reg);
class HMEditor;
};
} // End llvm namespace