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authorsayle <sayle@138bc75d-0d04-0410-961f-82ee72b054a4>2005-01-08 14:47:56 +0000
committersayle <sayle@138bc75d-0d04-0410-961f-82ee72b054a4>2005-01-08 14:47:56 +0000
commit1ebefdcd36f307f94ec94376af932b1472089322 (patch)
tree6fa5bb4ea1832b1bc0f31bb3af40958fe981dd75 /gcc/ifcvt.c
parentadbea5d454ec3c64cdd848638ea61ebc03470599 (diff)
downloadgcc-1ebefdcd36f307f94ec94376af932b1472089322.tar.gz
* ifcvt.c (find_if_case_1): Reinstate 2005-01-04 change, now that
the latent bug in rtl_delete_block has been resolved. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@93085 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/ifcvt.c')
-rw-r--r--gcc/ifcvt.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/gcc/ifcvt.c b/gcc/ifcvt.c
index 98fbd667a01..5eea041d404 100644
--- a/gcc/ifcvt.c
+++ b/gcc/ifcvt.c
@@ -2927,7 +2927,22 @@ 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
+ && else_bb != EXIT_BLOCK_PTR)
+ {
+ 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);