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| From: | Paolo Bonzini |
| Subject: | Re: [Qemu-devel] [RFC PATCH V3] Use atomic cmpxchg to atomically check the exclusive value in a STREX |
| Date: | Fri, 19 Jun 2015 09:31:04 +0200 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
On 19/06/2015 09:29, Mark Burton wrote: > Does anybody know if the current atomic_cmpxchg will support 64 bit > on a (normal) 32 bit x86, or do we need to special case that with > cmpxchg8b ? (I get the impression that it will automatically use > cmpxchg8b, but not cmpxchg16b - but I’m by no means sure). Both cmpxchg8b and cmpxchg16b are used, respectively on 32-bit and 64-bit x86. Paolo
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