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| author | sayle <sayle@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-01-08 14:47:56 +0000 |
|---|---|---|
| committer | sayle <sayle@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-01-08 14:47:56 +0000 |
| commit | 1ebefdcd36f307f94ec94376af932b1472089322 (patch) | |
| tree | 6fa5bb4ea1832b1bc0f31bb3af40958fe981dd75 | |
| parent | adbea5d454ec3c64cdd848638ea61ebc03470599 (diff) | |
| download | ppe42-gcc-1ebefdcd36f307f94ec94376af932b1472089322.tar.gz ppe42-gcc-1ebefdcd36f307f94ec94376af932b1472089322.zip | |
* 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
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/ifcvt.c | 17 |
2 files changed, 21 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index f4da603a967..efe3238c757 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2005-01-08 Roger Sayle <roger@eyesopen.com> + + * ifcvt.c (find_if_case_1): Reinstate 2005-01-04 change, now that + the latent bug in rtl_delete_block has been resolved. + 2005-01-08 Richard Sandiford <rsandifo@redhat.com> * config/mips/t-iris6 (MULTILIB_DIRNAMES): Use -mabi argument values. 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); |
