Messages in this thread | | | Date | Mon, 23 Jul 2007 11:28:48 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [PATCH 7/8] i386: bitops: Kill needless usage of __asm__ __volatile__ |
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Satyam Sharma wrote: > The (3) as I had originally written / meant was that multiple > instructions in a volatile asm would not get _individually_ > interspersed with the rest of the code i.e. be emitted out > _consecutively_. I don't think we need any such guarantees for > the non-atomic variants of those operations, so it's good to > let the compiler have a free hand with what it wants to do, > and optimize/combine multiple bitops as necessary / possible, > which was the original intention. >
No, a single asm statement is always emitted in one piece. Gcc doesn't parse the string other than to do %-substitution to insert arguments, so it has no way to meaningfully split it up.
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