https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120683
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|vector_loop generates |vector_loop generates poor
|horrible prologue and |codes on memset/memcpy
|epilogue on memset/memcpy |
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
ix86_expand_set_or_cpymem has:
/* For now vector-version of memset is generated only for memory zeroing, as
creating of promoted vector value is very cheap in this case. */
if (issetmem && alg == vector_loop && val_exp != const0_rtx)
alg = unrolled_loop;
ix86_expand_vector_init_duplicate can handle variable and non-zero value.
