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Add a bit of documentation to copyPhysReg.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162879 91177308-0d34-0410-b5e6-96231b3b80d8
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Jakob Stoklund Olesen 2012-08-29 23:52:55 +00:00
parent 492d76b02e
commit b4e090dffc
1 changed files with 7 additions and 0 deletions
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7
include/llvm/Target/TargetInstrInfo.h
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@ -459,6 +459,13 @@ public:
}
/// copyPhysReg - Emit instructions to copy a pair of physical registers.
///
/// This function should support copies within any legal register class as
/// well as any cross-class copies created during instruction selection.
///
/// The source and destination registers may overlap, which may require a
/// careful implementation when multiple copy instructions are required for
/// large registers. See for example the ARM target.
virtual void copyPhysReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI, DebugLoc DL,
unsigned DestReg, unsigned SrcReg,