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flow.c (try_forward_edges): Accept fallthru edge; Update comment.

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* flow.c (try_forward_edges): Accept fallthru edge; Update comment.
	(try_crossjump_to_edge): Update commetns.
	(try_crossjump_bb): Likewise.

From-SVN: r44318
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Jan Hubicka 2001-07-25 00:34:43 +02:00 committed by Jan Hubicka
parent e7139885a9
commit 40fc4e6a9f
2 changed files with 16 additions and 8 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Wed Jul 25 00:32:49 CEST 2001 Jan Hubicka <jh@suse.cz>
* flow.c (try_forward_edges): Accept fallthru edge; Update comment.
(try_crossjump_to_edge): Update commetns.
(try_crossjump_bb): Likewise.
2001-07-24 Richard Henderson <rth@redhat.com>
* combine.c (distribute_notes): Move set of need_refresh

18
gcc/flow.c
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@ -3106,8 +3106,11 @@ try_forward_edges (b)
next = e->succ_next;
/* Skip complex edges because we don't know how to update them.
Skip fallthru edges because there's no jump to update. */
if (e->flags & (EDGE_COMPLEX | EDGE_FALLTHRU))
Still handle fallthru edges, as we can suceed to forward fallthru
edge to the same place as the branch edge of conditional branch
and turn conditional branch to an unconditonal branch. */
if (e->flags & EDGE_COMPLEX)
continue;
target = first = e->dest;
@ -3517,14 +3520,14 @@ try_crossjump_to_edge (mode, e1, e2)
&& forwarder_block_p (e2->dest->succ->dest))
return false;
/* Likewise with dead code. */
/* ??? Won't we have eliminated these by now? */
/* Likewise with dead code (possibly newly created by the other optimizations
of cfg_cleanup). */
if (!src1->pred || !src2->pred)
return false;
/* Likewise with non-jump edges. */
/* ??? Non-jump? You mean GET_CODE (e1->src-end) != JUMP_INSN?
This fails for computed-goto as well, which may in fact be joinable. */
/* Likewise with complex edges.
??? We should be able to handle most complex edges later with some
care. */
if (e1->flags & EDGE_COMPLEX)
return false;
@ -3724,7 +3727,6 @@ try_crossjump_bb (mode, bb)
checks of crossjump(A,B). In order to prevent redundant
checks of crossjump(B,A), require that A be the block
with the lowest index. */
/* ??? Perhaps better is lowest execution frequency. */
if (e->src->index > e2->src->index)
continue;