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Joining an interval with a dead copy instruction. Shorten the live range to the last use.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34645 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-02-26 21:37:37 +00:00
parent 946bca5bae
commit edeffb37dc
2 changed files with 51 additions and 23 deletions
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8
include/llvm/CodeGen/LiveIntervalAnalysis.h
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@ -258,9 +258,11 @@ namespace llvm {
bool AdjustCopiesBackFrom(LiveInterval &IntA, LiveInterval &IntB,
MachineInstr *CopyMI);
/// hasRegisterUse - Returns true if there is any use of the specific
/// reg between indexes Start and End.
bool hasRegisterUse(unsigned Reg, unsigned Start, unsigned End);
/// lastRegisterUse - Returns the last use of the specific register between
/// cycles Start and End. It also returns the use operand by reference. It
/// returns NULL if there are no uses.
MachineInstr *lastRegisterUse(unsigned Reg, unsigned Start, unsigned End,
MachineOperand *&MOU);
/// unsetRegisterKill - Unset IsKill property of all uses of specific
/// register of the specific instruction.