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

ifcvt.c (find_if_case_1): Avoid creating an empty forwarder block... 

* ifcvt.c (find_if_case_1): Avoid creating an empty forwarder block,
	if deleting the then-block allows the test-block to fallthru to the
	else-block.

From-SVN: r92919
This commit is contained in:
Roger Sayle 2005-01-05 01:45:00 +00:00 committed by Roger Sayle
parent f8f5c4b3aa
commit e82f57499b
2 changed files with 21 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 @@
2005-01-04 Roger Sayle <roger@eyesopen.com>
* ifcvt.c (find_if_case_1): Avoid creating an empty forwarder block,
if deleting the then-block allows the test-block to fallthru to the
else-block.
2005-01-04 Andrew Pinski <pinskia@physics.uc.edu>
PR c/19152

16
gcc/ifcvt.c
View File

@ -2927,7 +2927,21 @@ find_if_case_1 (basic_block test_bb, edge then_edge, edge else_edge)
else_bb->global_live_at_start,
then_bb->global_live_at_end);
new_bb = redirect_edge_and_branch_force (FALLTHRU_EDGE (test_bb), else_bb);
/* We can avoid creating a new basic block if then_bb is immediately
followed by else_bb, i.e. deleting then_bb allows test_bb to fall
thru to else_bb. */
if (then_bb->next_bb == else_bb
&& then_bb->prev_bb == test_bb)
{
redirect_edge_succ (FALLTHRU_EDGE (test_bb), else_bb);
new_bb = 0;
}
else
new_bb = redirect_edge_and_branch_force (FALLTHRU_EDGE (test_bb),
else_bb);
then_bb_index = then_bb->index;
delete_basic_block (then_bb);