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Properly handle kills of a physical register which has sub-registers that are read by later instructions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37739 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-06-26 21:03:35 +00:00
parent c4f2fe0694
commit 4efe74129f
2 changed files with 83 additions and 13 deletions
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10
include/llvm/CodeGen/LiveVariables.h
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@ -31,6 +31,7 @@
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include <map>
@ -163,6 +164,15 @@ private: // Intermediate data structures
bool addRegisterDead(unsigned IncomingReg, MachineInstr *MI,
bool AddIfNotFound = false);
void addRegisterKills(unsigned Reg, MachineInstr *MI,
SmallSet<unsigned, 4> &SubKills);
/// HandlePhysRegKill - Add kills of Reg and its sub-registers to the
/// uses. Pay special attention to the sub-register uses which may come below
/// the last use of the whole register.
bool HandlePhysRegKill(unsigned Reg, MachineInstr *MI,
SmallSet<unsigned, 4> &SubKills);
bool HandlePhysRegKill(unsigned Reg, MachineInstr *MI);
void HandlePhysRegUse(unsigned Reg, MachineInstr *MI);
void HandlePhysRegDef(unsigned Reg, MachineInstr *MI);