http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59992
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Untested hack to generate somewhat smaller recog_* functions by dynamically
lowering the threshold if we'd see too big functions. With this patch we get
149 recog_* functions instead of 122, and largest number of lines in one
function decreases from more than 20000 to about 9000.
--- genrecog.c.jj 2014-01-03 11:40:29.000000000 +0100
+++ genrecog.c 2014-02-10 12:21:32.547199720 +0100
@@ -1504,15 +1504,26 @@ simplify_tests (struct decision_head *he
that is generated. */
static int
-break_out_subroutines (struct decision_head *head, int initial)
+break_out_subroutines (struct decision_head *head, int initial, int threshold)
{
- int size = 0;
+ int size = 0, t;
struct decision *sub;
- for (sub = head->first; sub; sub = sub->next)
- size += 1 + break_out_subroutines (&sub->success, 0);
+ if (head->first && head->first->subroutine_number)
+ return 1;
+
+ for (t = SUBROUTINE_THRESHOLD;
+ t > SUBROUTINE_THRESHOLD / 2;
+ t -= SUBROUTINE_THRESHOLD / 10)
+ {
+ size = 0;
+ for (sub = head->first; sub; sub = sub->next)
+ size += 1 + break_out_subroutines (&sub->success, 0, t);
+ if (size < SUBROUTINE_THRESHOLD * 5)
+ break;
+ }
- if (size > SUBROUTINE_THRESHOLD && ! initial)
+ if (size > threshold && ! initial)
{
head->first->subroutine_number = ++next_subroutine_number;
size = 1;
@@ -2486,7 +2497,7 @@ process_tree (struct decision_head *head
factor_tests (head);
next_subroutine_number = 0;
- break_out_subroutines (head, 1);
+ break_out_subroutines (head, 1, SUBROUTINE_THRESHOLD);
find_afterward (head, NULL);
/* We run this after find_afterward, because find_afterward needs
