Clarify meaning of copyRegToReg's return value.

llvm-svn: 57449
2008-10-13 17:30:56 +00:00 · 2008-10-13 17:30:56 +00:00 · be688ffced
parent aef747fc53
commit be688ffced
1 changed files with 3 additions and 1 deletions
--- a/llvm/include/llvm/Target/TargetInstrInfo.h
+++ b/llvm/include/llvm/Target/TargetInstrInfo.h
@ -220,7 +220,9 @@ public:
    return 0;
  }
  
-  /// copyRegToReg - Add a copy between a pair of registers
+  /// copyRegToReg - Emit instructions to copy between a pair of registers. It
+  /// returns false if the target does not how to copy between the specified
+  /// registers.
  virtual bool copyRegToReg(MachineBasicBlock &MBB,
                            MachineBasicBlock::iterator MI,
                            unsigned DestReg, unsigned SrcReg,