> On 17 May 2017, at 11:55, Christophe Fergeau <cferg...@redhat.com> wrote: > > On Wed, May 17, 2017 at 11:45:50AM +0200, Christophe de Dinechin wrote: >>> I'm really sure no architecture on hearth can do check and print in >>> a single machine instruction. >> >> This is not what I said. I said that the cost in the likely case was one >> extra instruction. >> >>> Actually I don't know any architecture >>> where a single check like this can be done in a single instruction. >> >> Reduced source code: https://pastebin.com/ibZEVThA. >> >> Machine code for x86 with clang: https://pastebin.com/Vmtwpkhf >> >> The test follows the call to malloc. It’s a single “testb” instruction >> followed by a never-taken conditional jump to cold-code. > > NB: feel free to annotate such tests with G_LIKELY/G_UNLIKELY
Thanks. It’s already in my version, but I have not shared it yet. Christophe > > Christophe _______________________________________________ Spice-devel mailing list Spice-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/spice-devel
