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flow.c (try_redirect_by_replacing_jump): Remove cc0 setter.

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* flow.c (try_redirect_by_replacing_jump): Remove cc0 setter.

	* flow.c (forwarder_block_p): Fix for fallthru blocks.
	(try_redirect_by_replacing_jump): Update properly the count
	and frequency information.

From-SVN: r43708
This commit is contained in:
Jan Hubicka 2001-07-02 23:16:50 +02:00 committed by Jan Hubicka
parent 861d4e70e8
commit f8d1529b85
2 changed files with 36 additions and 9 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
Mon Jul 2 23:14:00 CEST 2001 Jan Hubicka <jh@suse.cz>
* flow.c (try_redirect_by_replacing_jump): Remove cc0 setter.
* flow.c (forwarder_block_p): Fix for fallthru blocks.
(try_redirect_by_replacing_jump): Update properly the count
and frequency information.
Mon Jul 2 14:20:13 2001 Jeffrey A Law (law@cygnus.com)
* toplev.c (dump_file_index): Move SSA dumps just after first

37
gcc/flow.c
View File

@ -1597,18 +1597,19 @@ static bool
forwarder_block_p (bb)
basic_block bb;
{
rtx insn;
rtx insn = bb->head;
if (bb == EXIT_BLOCK_PTR || bb == ENTRY_BLOCK_PTR
|| !bb->succ || bb->succ->succ_next)
return false;
insn = next_active_insn (bb->head);
if (!insn)
return false;
if (GET_CODE (insn) == CODE_LABEL
|| (GET_CODE (insn) == JUMP_INSN && onlyjump_p (insn)))
return true;
return false;
while (insn != bb->end)
{
if (active_insn_p (insn))
return false;
insn = NEXT_INSN (insn);
}
return (!active_insn_p (insn)
|| (GET_CODE (insn) == JUMP_INSN && onlyjump_p (insn)));
}
/* Return nonzero if we can reach target from src by falling trought. */
@ -1699,6 +1700,8 @@ try_redirect_by_replacing_jump (e, target)
e->flags = EDGE_FALLTHRU;
else
e->flags = 0;
e->probability = REG_BR_PROB_BASE;
e->count = src->count;
/* Fixup barriers. */
barrier = next_nonnote_insn (insn);
@ -1707,6 +1710,20 @@ try_redirect_by_replacing_jump (e, target)
else if (!fallthru && GET_CODE (barrier) != BARRIER)
emit_barrier_after (insn);
/* In case we've zapped an conditional jump, we need to kill the cc0
setter too if available. */
#ifdef HAVE_cc0
insn = src->end;
if (GET_CODE (insn) == JUMP_INSN)
insn = prev_nonnote_insn (insn);
if (sets_cc0_p (insn))
{
if (insn == src->end)
src->end = PREV_INSN (insn);
flow_delete_insn (insn);
}
#endif
if (e->dest != target)
redirect_edge_succ (e, target);
return true;
@ -1766,7 +1783,7 @@ redirect_edge_and_branch (e, target)
for (j = GET_NUM_ELEM (vec) - 1; j >= 0; --j)
if (XEXP (RTVEC_ELT (vec, j), 0) == old_label)
{
RTVEC_ELT (vec, j) = gen_rtx_LABEL_REF (VOIDmode, new_label);
RTVEC_ELT (vec, j) = gen_rtx_LABEL_REF (Pmode, new_label);
--LABEL_NUSES (old_label);
++LABEL_NUSES (new_label);
}
@ -1815,6 +1832,8 @@ redirect_edge_and_branch (e, target)
if (s)
{
s->flags |= e->flags;
s->probability += e->probability;
s->count += e->count;
remove_edge (e);
}
else