diff options
| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-08-29 23:52:55 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-08-29 23:52:55 +0000 |
| commit | b4e090dffc4bed40cee22b94560aa8dd3b4af013 (patch) | |
| tree | 8bedc10c7caf0cda1cacd85d3709e0a17e5e1037 /include | |
| parent | 492d76b02ec5dd84fa59f79ce83cd3e5ae6603fe (diff) | |
| download | external_llvm-b4e090dffc4bed40cee22b94560aa8dd3b4af013.zip external_llvm-b4e090dffc4bed40cee22b94560aa8dd3b4af013.tar.gz external_llvm-b4e090dffc4bed40cee22b94560aa8dd3b4af013.tar.bz2 | |
Add a bit of documentation to copyPhysReg.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162879 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include')
| -rw-r--r-- | include/llvm/Target/TargetInstrInfo.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/llvm/Target/TargetInstrInfo.h b/include/llvm/Target/TargetInstrInfo.h index 44953a2..d7cc1cf 100644 --- a/include/llvm/Target/TargetInstrInfo.h +++ b/include/llvm/Target/TargetInstrInfo.h @@ -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, |