Make opt_aref instruction support Integer#[]

only when its receiver and the argument are both Integers.

Since 6bedbf4625, Integer#[] has supported a range extraction.
This means that Integer#[] now accepts multiple arguments, which made
the method very slow unfortunately.

This change fixes the performance issue by adding a special handling for
its traditional use case: `num[idx]` where both `num` and `idx` are
Integers.

1 files changed, 1 insertions, 0 deletions

diff --git a/internal.h b/internal.h
index 4312f8d442..b1e6aec0dd 100644
--- a/internal.h
+++ b/internal.h
@@ -1737,6 +1737,7 @@ VALUE rb_int_round(VALUE num, int ndigits, enum ruby_num_rounding_mode mode);
 VALUE rb_int2str(VALUE num, int base);
 VALUE rb_dbl_hash(double d);
 VALUE rb_fix_plus(VALUE x, VALUE y);
+VALUE rb_fix_aref(VALUE fix, VALUE idx);
 VALUE rb_int_gt(VALUE x, VALUE y);
 int rb_float_cmp(VALUE x, VALUE y);
 VALUE rb_float_gt(VALUE x, VALUE y);