x86 lock prefix

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1

Hi,

I need the x86 backend to emit a "lock" prefix before a couple
of instructions. I've added it as a prefix class to
X86InstrInfo.td:

class LOCK { bits<4> Prefix = 11; }

and added it as a prefix to the relevant instructions.

I can't figure out how to get the "lock" prefix to actually
print when the asm code is printed.

Thanks,
Brent

2

I need the x86 backend to emit a "lock" prefix before a couple
of instructions. I've added it as a prefix class to
X86InstrInfo.td:

class LOCK { bits<4> Prefix = 11; }

and added it as a prefix to the relevant instructions.

ok.

I can't figure out how to get the "lock" prefix to actually
print when the asm code is printed.

Just add it to the asm string for the instruction:

   "lock; add ... "

-Chris