From 14743e83b9214fa9a6a5697dc08aafa37b62b046 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sun, 21 Sep 2008 23:30:17 +0000 Subject: explain what earlyclobber actually is. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56415 91177308-0d34-0410-b5e6-96231b3b80d8 --- include/llvm/CodeGen/MachineOperand.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'include/llvm/CodeGen/MachineOperand.h') diff --git a/include/llvm/CodeGen/MachineOperand.h b/include/llvm/CodeGen/MachineOperand.h index 555f320..c2399be 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 -- cgit v1.1