Reduce ONIG_NREGION from 10 to 4: power of 2 and testing revealed most pattern matches are less than or equal to 4 results

Closes: https://github.com/ruby/ruby/pull/2135

1 files changed, 11 insertions, 0 deletions

diff --git a/gc.c b/gc.c
index 5bd0cf75b6..b629c03dc0 100644
--- a/gc.c
+++ b/gc.c
@@ -2436,6 +2436,17 @@ obj_free(rb_objspace_t *objspace, VALUE obj)
       case T_MATCH:
 	if (RANY(obj)->as.match.rmatch) {
             struct rmatch *rm = RANY(obj)->as.match.rmatch;
+#if USE_DEBUG_COUNTER
+            if (rm->regs.num_regs >= 8) {
+                RB_DEBUG_COUNTER_INC(obj_match_ge8);
+            }
+            else if (rm->regs.num_regs >= 4) {
+                RB_DEBUG_COUNTER_INC(obj_match_ge4);
+            }
+            else if (rm->regs.num_regs >= 1) {
+                RB_DEBUG_COUNTER_INC(obj_match_under4);
+            }
+#endif
 	    onig_region_free(&rm->regs, 0);
             if (rm->char_offset)
 		xfree(rm->char_offset);