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, 1 deletions

diff --git a/vm.c b/vm.c
index 3f5a619e3c..70ec2315c1 100644
--- a/vm.c
+++ b/vm.c
@@ -1643,7 +1643,7 @@ vm_init_redefined_flag(void)
     OP(GT, GT), (C(Integer), C(Float));
     OP(GE, GE), (C(Integer), C(Float));
     OP(LTLT, LTLT), (C(String), C(Array));
-    OP(AREF, AREF), (C(Array), C(Hash));
+    OP(AREF, AREF), (C(Array), C(Hash), C(Integer));
     OP(ASET, ASET), (C(Array), C(Hash));
     OP(Length, LENGTH), (C(Array), C(String), C(Hash));
     OP(Size, SIZE), (C(Array), C(String), C(Hash));