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SubjectRe: [PATCH RFC 0/7] x86: convert ticketlocks to C and remove duplicate code
On 07/15/2011 04:06 PM, H. Peter Anvin wrote:
> On 07/15/2011 10:24 AM, Jeremy Fitzhardinge wrote:
>> I posted a bug about gcc not generating cmp %ah, %al in this case, but the general consensus was that
>> it's not a good choice on current Intel chips, because it causes a partial word stall, and that the
>> current generated code is better. (And gcc can generate "cmp %Xh, %Xl" if it wants to - see below.)
>>
> Which version of gcc is this, and also, do you have the gcc bug report
> number? I was talking to H.J. and he said he thought it sounded strange.

gcc version 4.6.0 20110530 (Red Hat 4.6.0-9) (GCC)

It's bug 47556.

J


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