Am Donnerstag, 11. September 2014, 08:52:39 schrieb Matt Turner: > On Thu, Sep 11, 2014 at 6:58 AM, Marc Dietrich <marvi...@gmx.de> wrote: > > File specific optimization as used for > > src/mesa/main/streaming-load-memcpy.c currently will cause problems with > > LTO in the future > > (see: https://bugs.freedesktop.org/show_bug.cgi?id=83669). Replace it with > > in-file target specification. > > This is only available in gcc-4.8 and later.
no, it's there since 4.4 (4.8 has some runtime auto selection for c++ AFAIK). See https://gcc.gnu.org/gcc-4.4/changes.html (C family). I guess we need a fallback for compilers supporting -msse4.1 (icc only?) and not __attribute__ (target). I have the feeling that the whole cpu specific optimization is often tied closely to the compiler used. I wonder if there is a better solution we could choose, especially now that only one function causes problems. I remember a project called liboil (which is abandoned now) which provided some cpu specific accel paths. Also Mesa starts to use pixmap for certain routines. Marc
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