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RegisterPresssureTracker: Track live physical register by unit.

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This is much simpler to reason about, more efficient, and
fixes some corner cases involving implicit super-register defs.
Fixed rdar://12797931.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169425 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2012-12-05 21:37:42 +00:00
parent 0602bb4659
commit 553c42cefc
4 changed files with 133 additions and 99 deletions
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13
include/llvm/CodeGen/RegisterPressure.h
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@@ -30,7 +30,7 @@ struct RegisterPressure {
/// Map of max reg pressure indexed by pressure set ID, not class ID.
std::vector<unsigned> MaxSetPressure;
/// List of live in registers.
/// List of live in virtual registers or physical register units.
SmallVector<unsigned,8> LiveInRegs;
SmallVector<unsigned,8> LiveOutRegs;
@@ -39,10 +39,16 @@ struct RegisterPressure {
/// to account for live through (global liveness).
void increase(const TargetRegisterClass *RC, const TargetRegisterInfo *TRI);
/// Increase pressure for each pressure set impacted by this register unit.
void increase(unsigned RU, const TargetRegisterInfo *TRI);
/// Decrease register pressure for each pressure set impacted by this register
/// class. This is only useful to account for spilling or rematerialization.
void decrease(const TargetRegisterClass *RC, const TargetRegisterInfo *TRI);
/// Decrease pressure for each pressure set impacted by this register unit.
void decrease(unsigned RU, const TargetRegisterInfo *TRI);
void dump(const TargetRegisterInfo *TRI) const;
};
@@ -172,8 +178,9 @@ public:
const LiveIntervals *lis, const MachineBasicBlock *mbb,
MachineBasicBlock::const_iterator pos);
/// Force liveness of registers. Particularly useful to initialize the
/// livein/out state of the tracker before the first call to advance/recede.
/// Force liveness of virtual registers or physical register
/// units. Particularly useful to initialize the livein/out state of the
/// tracker before the first call to advance/recede.
void addLiveRegs(ArrayRef<unsigned> Regs);
/// Get the MI position corresponding to this register pressure.