diff options
Diffstat (limited to 'gcc/cfglayout.c')
| -rw-r--r-- | gcc/cfglayout.c | 40 |
1 files changed, 6 insertions, 34 deletions
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. */ |