>
> gcc/
>
> * config/i386/i386-expand.c (expand_set_or_cpymem_via_rep):
> For TARGET_PREFER_KNOWN_REP_MOVSB_STOSB, don't convert QImode
> to SImode.
> (decide_alg): For TARGET_PREFER_KNOWN_REP_MOVSB_STOSB, use
> "rep movsb/stosb" only for known sizes.
> * conf
Simply memcpy and memset inline strategies to avoid branches for
-mtune=icelake:
1. With MOVE_RATIO and CLEAR_RATIO == 17, GCC will use integer/vector
load and store for up to 16 * 16 (256) bytes when the data size is
fixed and known.
2. Inline only if data size is known to be <= 256.
a.
