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| author | Chris Lattner <sabre@nondot.org> | 2008-09-21 23:30:17 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-09-21 23:30:17 +0000 |
| commit | 14743e83b9214fa9a6a5697dc08aafa37b62b046 (patch) | |
| tree | 96626bff0c2254baac52c97e74598b91db636f49 /include/llvm/CodeGen/MachineOperand.h | |
| parent | 743922ea75ba650b9e87a3627f0de8d1e0869d00 (diff) | |
explain what earlyclobber actually is.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56415 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm/CodeGen/MachineOperand.h')
| -rw-r--r-- | include/llvm/CodeGen/MachineOperand.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/include/llvm/CodeGen/MachineOperand.h b/include/llvm/CodeGen/MachineOperand.h index 555f320027..c2399beaf6 100644 --- a/include/llvm/CodeGen/MachineOperand.h +++ b/include/llvm/CodeGen/MachineOperand.h @@ -68,9 +68,9 @@ private: /// This is only valid on definitions of registers. bool IsDead : 1; - /// IsEarlyClobber - True if this MO_Register operand is marked earlyclobber - /// in an inline asm. Flag is not valid for any other case. See gcc doc - /// for description of earlyclobber. + /// IsEarlyClobber - True if this MO_Register 'def' operand is written to + /// by the MachineInstr before all input registers are read. This is used to + /// model the GCC inline asm '&' constraint modifier. bool IsEarlyClobber : 1; /// OverlapsEarlyClobber - True if this MO_Register operand is used as an |