[Mesa-dev] [Bug 107670] Massive slowdown under specific memcpy implementations (32bit, no-SIMD, backward copy).

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Aug 24 12:55:12 UTC 2018


--- Comment #6 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to Timothy Arceri from comment #1)
> There already is asm optimized version of memcpy() in glibc. Why would we
> want to reinvent that in Mesa?
> glibc should pick the right implementation for you system.

How would memcpy() know that the destination is mapped to PCI-E address space
i.e. gets transparently transferred over the PCI-E bus (which has its own
performance constraints)?

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