diff options
Diffstat (limited to 'gcc/cfgrtl.c')
| -rw-r--r-- | gcc/cfgrtl.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/gcc/cfgrtl.c b/gcc/cfgrtl.c index 85738a4..d6733a2 100644 --- a/gcc/cfgrtl.c +++ b/gcc/cfgrtl.c @@ -1959,10 +1959,18 @@ commit_one_edge_insertion (edge e) } /* If the source has one successor and the edge is not abnormal, - insert there. Except for the entry block. */ + insert there. Except for the entry block. + Don't do this if the predecessor ends in a jump other than + unconditional simple jump. E.g. for asm goto that points all + its labels at the fallthru basic block, we can't insert instructions + before the asm goto, as the asm goto can have various of side effects, + and can't emit instructions after the asm goto, as it must end + the basic block. */ else if ((e->flags & EDGE_ABNORMAL) == 0 && single_succ_p (e->src) - && e->src != ENTRY_BLOCK_PTR) + && e->src != ENTRY_BLOCK_PTR + && (!JUMP_P (BB_END (e->src)) + || simplejump_p (BB_END (e->src)))) { bb = e->src; |