https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98442
--- Comment #1 from Hongtao.liu <crazylht at gmail dot com> ---
>
> Define TARGET_USE_BY_PIECES_INFRASTRUCTURE_P for i386?
It's actually determined by MOV_MAX_PIECES and related to MAX_FIXED_MODE_SIZE
??? We should use TImode in 32-bit mode and use OImode or XImode
if they are available. But since by_pieces_ninsns determines the
widest mode with MAX_FIXED_MODE_SIZE, we can only use TImode in
64-bit mode. */
#define MOVE_MAX_PIECES \
((TARGET_64BIT \
&& TARGET_SSE2 \
&& TARGET_SSE_UNALIGNED_LOAD_OPTIMAL \
&& TARGET_SSE_UNALIGNED_STORE_OPTIMAL) \
? GET_MODE_SIZE (OImode) : UNITS_PER_WORD)
