From 07ef97df22995fc743df030e4689a59494c243d7 Mon Sep 17 00:00:00 2001
From: Sampo Kuokkanen <sampo.kuokkanen@gmail.com>
Date: Fri, 4 Sep 2026 09:08:20 +0900
Subject: [PATCH] Fetch the execution context once in Array#each (#18610)

rb_yield() calls GET_EC() on every element, which on arm64 is an
out-of-line call to rb_current_ec() (RB_THREAD_CURRENT_EC_NOINLINE).
Hoist it out of the loop and use rb_ec_yield(), as ff831eb057 does
for Mutex#synchronize.

benchmark/loop_each.yml: 1.16x on arm64-darwin, 1.05x on aarch64-linux.
---
 array.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/array.c b/array.c
index 91ddc5c60b9b10..f0d50502506d96 100644
--- a/array.c
+++ b/array.c
@@ -2786,8 +2786,9 @@ rb_ary_each(VALUE ary)
     long i;
     ary_verify(ary);
     RETURN_SIZED_ENUMERATOR(ary, 0, 0, ary_enum_length);
+    rb_execution_context_t *ec = GET_EC();
     for (i=0; i<RARRAY_LEN(ary); i++) {
-        rb_yield(RARRAY_AREF(ary, i));
+        rb_ec_yield(ec, RARRAY_AREF(ary, i));
     }
     return ary;
 }