http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59605
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-12-26
Ever confirmed|0 |1
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
ix86_expand_set_or_movmem has
rtx jump_around_label = NULL;
/* Misaligned move sequences handles both prologues and epilogues at once.
Default code generation results in smaller code for large alignments and
also avoids redundant job when sizes are known precisely. */
if (misaligned_prologue_used)
{
/* Misaligned move prologue handled small blocks by itself. */
expand_set_or_movmem_prologue_epilogue_by_misaligned_moves
(dst, src, &destreg, &srcreg,
move_mode, promoted_val, vec_promoted_val,
&count_exp,
&jump_around_label,
desired_align < align
? MAX (desired_align, epilogue_size_needed) : epilogue_size_needed,
desired_align, align, &min_size, dynamic_check, issetmem);
if (!issetmem)
src = change_address (src, BLKmode, srcreg);
...
else
{
rtx hot_label = gen_label_rtx ();
jump_around_label = gen_label_rtx ();
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
When jump_around_label != NULL, the previous jump_around_label
is lost.
emit_cmp_and_jump_insns (count_exp, GEN_INT (dynamic_check - 1),
LEU, 0, GET_MODE (count_exp), 1, hot_label);
predict_jump (REG_BR_PROB_BASE * 90 / 100);
if (issetmem)
set_storage_via_libcall (dst, count_exp, val_exp, false);
else
emit_block_move_via_libcall (dst, src, count_exp, false);
emit_jump (jump_around_label);
emit_label (hot_label);
}
