https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120734
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |liuhongt at gcc dot gnu.org
Summary|-m32 -march=i686 doesn't |*mov<mode>_(and|or) can be
|use "mov $0, mem" |used for
| |TARGET_SPLIT_LONG_MOVES
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
Since there is
/* X86_TUNE_SPLIT_LONG_MOVES: Avoid instructions moving immediates
directly to memory. */
DEF_TUNE (X86_TUNE_SPLIT_LONG_MOVES, "split_long_moves", m_PPRO)
to avoid long move instructions, like
c7 02 00 00 00 00 movl $0x0,(%rdx)
c7 02 ff ff ff ff movl $0xffffffff,(%rdx)
*mov<mode>_(and|or) can be enable for TARGET_SPLIT_LONG_MOVES with
83 22 00 andl $0x0,(%rdx)
83 0a ff orl $0xffffffff,(%rdx)
