On 02/16/2012 11:47 AM, Jakub Jelinek wrote:
if you want to use different fallback code from the transaction code. So the above is right and needed, though perhaps we might want a combine pattern or peephole to turn the movl $-1, %eax xbegin .+6 cmpl %eax, $-1 jne 1f sequence into movl $-1, %eax xbegin 1f if flags register is dead at that point, and perhaps also remove the movl $-1, %eax if %eax is not live when not jumping.
Yes this is what I meant. In fact, I was expecting that to be implemented directly with the RTM support otherwise as Andi said, asm macros is enough to use RTM. I think the goal of Intel was to avoid this cmp/jne but at least this a first step to implement RTM intrinsics in GCC. (It was just a note that it could be improved, no more).
On 02/16/2012 12:11 PM, Andi Kleen wrote: > For macros asm goto maps well to XBEGIN today. Yes, I tried it when HJ committed it in binutils but thanks for the info. -- Patrick.
