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-rw-r--r--include/llvm/CodeGen/LiveIntervalAnalysis.h57
1 files changed, 43 insertions, 14 deletions
diff --git a/include/llvm/CodeGen/LiveIntervalAnalysis.h b/include/llvm/CodeGen/LiveIntervalAnalysis.h
index f9bd317..dc52c0a 100644
--- a/include/llvm/CodeGen/LiveIntervalAnalysis.h
+++ b/include/llvm/CodeGen/LiveIntervalAnalysis.h
@@ -27,12 +27,15 @@
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/SlotIndexes.h"
#include "llvm/Support/Allocator.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include <cmath>
#include <iterator>
namespace llvm {
+extern cl::opt<bool> UseSegmentSetForPhysRegs;
+
class AliasAnalysis;
class BitVector;
class BlockFrequency;
@@ -154,16 +157,11 @@ namespace llvm {
bool shrinkToUses(LiveInterval *li,
SmallVectorImpl<MachineInstr*> *dead = nullptr);
- /// \brief Walk the values in the given interval and compute which ones
- /// are dead. Dead values are not deleted, however:
- /// - Dead PHIDef values are marked as unused.
- /// - New dead machine instructions are added to the 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);
+ /// 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.
+ 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
@@ -175,14 +173,15 @@ namespace llvm {
/// See also LiveRangeCalc::extend().
void extendToIndices(LiveRange &LR, ArrayRef<SlotIndex> Indices);
- /// pruneValue - If an LI value is live at Kill, prune its live range by
- /// removing any liveness reachable from Kill. Add live range end points to
+
+ /// If @p LR has a live value at @p Kill, prune its live range by removing
+ /// any liveness reachable from Kill. Add live range end points to
/// EndPoints such that extendToIndices(LI, EndPoints) will reconstruct the
/// value's live range.
///
/// Calling pruneValue() and extendToIndices() can be used to reconstruct
/// SSA form after adding defs to a virtual register.
- void pruneValue(LiveInterval *LI, SlotIndex Kill,
+ void pruneValue(LiveRange &LR, SlotIndex Kill,
SmallVectorImpl<SlotIndex> *EndPoints);
SlotIndexes *getSlotIndexes() const {
@@ -381,7 +380,8 @@ namespace llvm {
LiveRange *LR = RegUnitRanges[Unit];
if (!LR) {
// Compute missing ranges on demand.
- RegUnitRanges[Unit] = LR = new LiveRange();
+ // Use segment set to speed-up initial computation of the live range.
+ RegUnitRanges[Unit] = LR = new LiveRange(UseSegmentSetForPhysRegs);
computeRegUnitRange(*LR, Unit);
}
return *LR;
@@ -397,6 +397,15 @@ namespace llvm {
return RegUnitRanges[Unit];
}
+ /// Remove value numbers and related live segments starting at position
+ /// @p Pos that are part of any liverange of physical register @p Reg or one
+ /// of its subregisters.
+ void removePhysRegDefAt(unsigned Reg, SlotIndex Pos);
+
+ /// Remove value number and related live segments of @p LI and its subranges
+ /// that start at position @p Pos.
+ void removeVRegDefAt(LiveInterval &LI, SlotIndex Pos);
+
private:
/// Compute live intervals for all virtual registers.
void computeVirtRegs();
@@ -404,6 +413,16 @@ namespace llvm {
/// Compute RegMaskSlots and RegMaskBits.
void computeRegMasks();
+ /// Walk the values in @p LI and check for dead values:
+ /// - Dead PHIDef values are marked as unused.
+ /// - 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);
void printInstrs(raw_ostream &O) const;
@@ -413,6 +432,16 @@ namespace llvm {
void computeRegUnitRange(LiveRange&, unsigned Unit);
void computeVirtRegInterval(LiveInterval&);
+
+ /// Helper function for repairIntervalsInRange(), walks backwards and
+ /// creates/modifies live segments in @p LR to match the operands found.
+ /// Only full operands or operands with subregisters matching @p LaneMask
+ /// are considered.
+ void repairOldRegInRange(MachineBasicBlock::iterator Begin,
+ MachineBasicBlock::iterator End,
+ const SlotIndex endIdx, LiveRange &LR,
+ unsigned Reg, unsigned LaneMask = ~0u);
+
class HMEditor;
};
} // End llvm namespace