diff options
Diffstat (limited to 'gcc/tree-tailcall.c')
| -rw-r--r-- | gcc/tree-tailcall.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/gcc/tree-tailcall.c b/gcc/tree-tailcall.c index 3a40a61..3c7518d 100644 --- a/gcc/tree-tailcall.c +++ b/gcc/tree-tailcall.c @@ -668,6 +668,29 @@ adjust_return_value (basic_block bb, tree m, tree a) update_stmt (ret_stmt); } +/* Subtract COUNT and FREQUENCY from the basic block and it's + outgoing edge. */ +static void +decrease_profile (basic_block bb, gcov_type count, int frequency) +{ + edge e; + bb->count -= count; + if (bb->count < 0) + bb->count = 0; + bb->frequency -= frequency; + if (bb->frequency < 0) + bb->frequency = 0; + if (!single_succ_p (bb)) + { + gcc_assert (!EDGE_COUNT (bb->succs)); + return; + } + e = single_succ_edge (bb); + e->count -= count; + if (e->count < 0) + e->count = 0; +} + /* Eliminates tail call described by T. TMP_VARS is a list of temporary variables used to copy the function arguments. */ @@ -717,6 +740,13 @@ eliminate_tail_call (struct tailcall *t) release_defs (t); } + /* Number of executions of function has reduced by the tailcall. */ + e = single_succ_edge (t->call_block); + decrease_profile (EXIT_BLOCK_PTR, e->count, EDGE_FREQUENCY (e)); + decrease_profile (ENTRY_BLOCK_PTR, e->count, EDGE_FREQUENCY (e)); + if (e->dest != EXIT_BLOCK_PTR) + decrease_profile (e->dest, e->count, EDGE_FREQUENCY (e)); + /* Replace the call by a jump to the start of function. */ e = redirect_edge_and_branch (single_succ_edge (t->call_block), first); gcc_assert (e); |