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LiveIntervalAnalysis: Cleanup computeDeadValues

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- This also fixes a bug introduced in r223880 where values were not
  correctly marked as Dead anymore.
- Cleanup computeDeadValues(): split up SubRange code variant, simplify
  arguments.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224538 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2014-12-18 19:58:52 +00:00
parent a75626b56b
commit b82636bb80
3 changed files with 48 additions and 35 deletions
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20
include/llvm/CodeGen/LiveIntervalAnalysis.h
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@@ -158,7 +158,7 @@ namespace llvm {
/// 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);
void shrinkToUses(LiveInterval::SubRange &SR, unsigned Reg);
/// extendToIndices - Extend the live range of LI to reach all points in
/// Indices. The points in the Indices array must be jointly dominated by
@@ -406,17 +406,15 @@ namespace llvm {
/// Compute RegMaskSlots and RegMaskBits.
void computeRegMasks();
/// \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:
/// Walk the values in @p LI and check for dead values:
/// - Dead PHIDef values are marked as unused.
/// - 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(LiveRange &Segments, LiveRange &LR,
bool *CanSeparate = nullptr, unsigned Reg = 0,
SmallVectorImpl<MachineInstr*> *dead = nullptr);
/// - Dead operands are marked as such.
/// - Completely dead machine instructions are added to the @p dead vector
/// if it is not nullptr.
/// Returns true if any PHI value numbers have been removed which may
/// have separated the interval into multiple connected components.
bool computeDeadValues(LiveInterval &LI,
SmallVectorImpl<MachineInstr*> *dead);
static LiveInterval* createInterval(unsigned Reg);