diff options
Diffstat (limited to 'gcc/cfgcleanup.c')
| -rw-r--r-- | gcc/cfgcleanup.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/gcc/cfgcleanup.c b/gcc/cfgcleanup.c index 51182e3f400..10d9e96c135 100644 --- a/gcc/cfgcleanup.c +++ b/gcc/cfgcleanup.c @@ -1368,7 +1368,7 @@ outgoing_edges_match (int mode, basic_block bb1, basic_block bb2) /* The labels should never be the same rtx. If they really are same the jump tables are same too. So disable crossjumping of blocks BB1 and BB2 because when deleting the common insns in the end of BB1 - by delete_block () the jump table would be deleted too. */ + by delete_basic_block () the jump table would be deleted too. */ /* If LABEL2 is referenced in BB1->END do not do anything because we would loose information when replacing LABEL1 by LABEL2 and then LABEL2 by LABEL1 in BB1->END. */ @@ -1501,6 +1501,8 @@ try_crossjump_to_edge (int mode, edge e1, edge e2) rtx newpos1, newpos2; edge s; + newpos1 = newpos2 = NULL_RTX; + /* If we have partitioned hot/cold basic blocks, it is a bad idea to try this optimization. */ @@ -2033,6 +2035,32 @@ delete_unreachable_blocks (void) tidy_fallthru_edges (); return changed; } + +/* Merges sequential blocks if possible. */ + +bool +merge_seq_blocks (void) +{ + basic_block bb; + bool changed = false; + + for (bb = ENTRY_BLOCK_PTR->next_bb; bb != EXIT_BLOCK_PTR; ) + { + if (bb->succ + && !bb->succ->succ_next + && can_merge_blocks_p (bb, bb->succ->dest)) + { + /* Merge the blocks and retry. */ + merge_blocks (bb, bb->succ->dest); + changed = true; + continue; + } + + bb = bb->next_bb; + } + + return changed; +} /* Tidy the CFG by deleting unreachable code and whatnot. */ |