https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98172
--- Comment #4 from Jan Hubicka <hubicka at ucw dot cz> ---
> > What kind of updates you propose?
>
> For one thing, memcpy/memset should be expanded to REP MOVSB/STOSB, never
> MOVSL/MOVSQ.
For core cost tables we use:
/* core_cost should produce code tuned for Core familly of CPUs. */
static stringop_algs core_memcpy[2] = {
{libcall, {{1024, rep_prefix_4_byte, true}, {-1, libcall, false}}},
{libcall, {{24, loop, true}, {128, rep_prefix_8_byte, true},
{-1, libcall, false}}}};
static stringop_algs core_memset[2] = {
{libcall, {{6, loop_1_byte, true},
{24, loop, true},
{8192, rep_prefix_4_byte, true},
{-1, libcall, false}}},
{libcall, {{24, loop, true}, {512, rep_prefix_8_byte, true},
{-1, libcall, false}}}};
So we use mosl/modsw for blocks up to 8k in some cases.
What is output of contrib/bench-stringop on later cores?
Honza
>
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