OpenE2K/gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

flow.c (delete_unreachable_blocks): Do not call merge_blocks or tidy_fallthru_edge if...

Browse Source 
* flow.c (delete_unreachable_blocks): Do not call merge_blocks
        or tidy_fallthru_edge if the last insn in the block is not
        an unconditional jump or a simple conditional jump.

From-SVN: r28483
This commit is contained in:
Jeffrey A Law 1999-08-04 07:11:26 +00:00 committed by Jeff Law
parent 31534a2cba
commit e8fe3cc34e
2 changed files with 17 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
Wed Aug 4 01:08:44 1999 Jeffrey A Law (law@cygnus.com)
* flow.c (delete_unreachable_blocks): Do not call merge_blocks
or tidy_fallthru_edge if the last insn in the block is not
an unconditional jump or a simple conditional jump.
Tue Aug 3 20:21:20 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* Makefile.in (c-decl.o): Depends on defaults.h.

12
gcc/flow.c
View File

@ -1563,7 +1563,12 @@ delete_unreachable_blocks ()
check that the edge is not a FALLTHRU edge. */
if ((s = b->succ) != NULL
&& s->succ_next == NULL
&& s->dest == c)
&& s->dest == c
/* If the last insn is not a normal conditional jump
(or an unconditional jump), then we can not tidy the
fallthru edge because we can not delete the jump. */
&& GET_CODE (b->end) == JUMP_INSN
&& condjump_p (b->end))
tidy_fallthru_edge (s, b, c);
}
@ -1582,6 +1587,11 @@ delete_unreachable_blocks ()
&& (s->flags & EDGE_EH) == 0
&& (c = s->dest) != EXIT_BLOCK_PTR
&& c->pred->pred_next == NULL
/* If the last insn is not a normal conditional jump
(or an unconditional jump), then we can not merge
the blocks because we can not delete the jump. */
&& GET_CODE (b->end) == JUMP_INSN
&& condjump_p (b->end)
&& merge_blocks (s, b, c))
continue;