Re: [PATCH 1/2] x86: optimize XCHG to MOV for same-register forms

Paul Floyd via Valgrind-developers <valgrind-developers-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Newsgroups gmane.comp.debugging.valgrind.devel,gmane.comp.gnu.binutils
Message-ID <[email protected]> 
On 2026-07-03 08:00, Jan Beulich wrote:
> On 03.07.2026 06:55, Paul Floyd wrote:
>> Would it be possible for gas to only do this transformation if the source and destination registers are different?
> When the registers are different, this transformation is invalid to do.

OK so you are optimising a no-op. Does GCC use it as a no-op?


Regards

Paul
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