diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 8 | ||||
| -rw-r--r-- | gcc/cfglayout.c | 40 | ||||
| -rw-r--r-- | gcc/cfgrtl.c | 3 |
3 files changed, 14 insertions, 37 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 2834096..0423185 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,11 @@ +2006-01-02 Eric Botcazou <ebotcazou@adacore.com> + Jan Hubicka <jh@suse.cz> + + * cfglayout.c (fixup_reorder_chain): Remove kludge for the + case of conditional jump jumping to the next instruction. + * cfgrtl.c (force_nonfallthru_and_redirect): Accept all + cases of conditional jump jumping to the next instruction. + 2006-01-02 Jan Hubicka <jh@suse.cz> * i386.c (*_cost): Add COSTS_N_INSNS. diff --git a/gcc/cfglayout.c b/gcc/cfglayout.c index d2580b4..5880819a 100644 --- a/gcc/cfglayout.c +++ b/gcc/cfglayout.c @@ -680,41 +680,13 @@ fixup_reorder_chain (void) continue; /* The degenerated case of conditional jump jumping to the next - instruction can happen on target having jumps with side - effects. - - Create temporarily the duplicated edge representing branch. - It will get unidentified by force_nonfallthru_and_redirect - that would otherwise get confused by fallthru edge not pointing - to the next basic block. */ + instruction can happen for jumps with side effects. We need + to construct a forwarder block and this will be done just + fine by force_nonfallthru below. */ if (!e_taken) - { - rtx note; - edge e_fake; - bool redirected; - - e_fake = unchecked_make_edge (bb, e_fall->dest, 0); - - redirected = redirect_jump (BB_END (bb), - block_label (bb), 0); - gcc_assert (redirected); - - note = find_reg_note (BB_END (bb), REG_BR_PROB, NULL_RTX); - if (note) - { - int prob = INTVAL (XEXP (note, 0)); - - e_fake->probability = prob; - e_fake->count = e_fall->count * prob / REG_BR_PROB_BASE; - e_fall->probability -= e_fall->probability; - e_fall->count -= e_fake->count; - if (e_fall->probability < 0) - e_fall->probability = 0; - if (e_fall->count < 0) - e_fall->count = 0; - } - } - /* There is one special case: if *neither* block is next, + ; + + /* There is another special case: if *neither* block is next, such as happens at the very end of a function, then we'll need to add a new unconditional jump. Choose the taken edge based on known or assumed probability. */ diff --git a/gcc/cfgrtl.c b/gcc/cfgrtl.c index fcf3590..6ff6c39 100644 --- a/gcc/cfgrtl.c +++ b/gcc/cfgrtl.c @@ -1014,9 +1014,6 @@ force_nonfallthru_and_redirect (edge e, basic_block target) by creating a basic block afterwards to redirect fallthru edge. */ if (e->src != ENTRY_BLOCK_PTR && e->dest != EXIT_BLOCK_PTR && any_condjump_p (BB_END (e->src)) - /* When called from cfglayout, fallthru edges do not - necessarily go to the next block. */ - && e->src->next_bb == e->dest && JUMP_LABEL (BB_END (e->src)) == BB_HEAD (e->dest)) { rtx note; |