diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/bb-reorder.c | 16 |
2 files changed, 21 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index dfc44b8..4f92feb 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2005-02-15 Richard Henderson <rth@redhat.com> + + * bb-reorder.c (find_traces_1_round): Force fallthru edge from a + call to be best_edge. + 2005-02-14 Kazu Hirata <kazu@cs.umass.edu> * basic-block.h: Adjust the prototype for find_basic_blocks. diff --git a/gcc/bb-reorder.c b/gcc/bb-reorder.c index f454ce0..d054ffd 100644 --- a/gcc/bb-reorder.c +++ b/gcc/bb-reorder.c @@ -488,6 +488,7 @@ find_traces_1_round (int branch_th, int exec_th, gcov_type count_th, do { int prob, freq; + bool ends_in_call; /* The probability and frequency of the best edge. */ int best_prob = INT_MIN / 2; @@ -501,6 +502,8 @@ find_traces_1_round (int branch_th, int exec_th, gcov_type count_th, fprintf (dump_file, "Basic block %d was visited in trace %d\n", bb->index, *n_traces - 1); + ends_in_call = block_ends_with_call_p (bb); + /* Select the successor that will be placed after BB. */ FOR_EACH_EDGE (e, ei, bb->succs) { @@ -520,6 +523,19 @@ find_traces_1_round (int branch_th, int exec_th, gcov_type count_th, prob = e->probability; freq = EDGE_FREQUENCY (e); + /* The only sensible preference for a call instruction is the + fallthru edge. Don't bother selecting anything else. */ + if (ends_in_call) + { + if (e->flags & EDGE_CAN_FALLTHRU) + { + best_edge = e; + best_prob = prob; + best_freq = freq; + } + continue; + } + /* Edge that cannot be fallthru or improbable or infrequent successor (i.e. it is unsuitable successor). */ if (!(e->flags & EDGE_CAN_FALLTHRU) || (e->flags & EDGE_COMPLEX) |