https://git.ruby-lang.org/ruby.git/commit/?id=873fb1aa4c

From 873fb1aa4cab7a14f2b38a05f5888c111ea3bc69 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Wed, 23 Sep 2020 13:30:56 +0900
Subject: ALLOCA_N: do not use RUBY_ALIGNOF

Now that RUBY_ALIGNOF behaves like C11's _Alignof.  This is not
necessarily the best stack arrangement.  We can just give up using
__builtin_alloca_with_align(), and let alloca choose what is optimal.

diff --git a/include/ruby/internal/memory.h b/include/ruby/internal/memory.h
index 0128a7f..974c21e 100644
--- a/include/ruby/internal/memory.h
+++ b/include/ruby/internal/memory.h
@@ -109,18 +109,8 @@ extern void *alloca(); https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/memory.h#L109
 #define RB_REALLOC_N(var,type,n) \
     ((var) = RBIMPL_CAST((type *)ruby_xrealloc2((void *)(var), (n), sizeof(type))))
 
-/* I don't know why but __builtin_alloca_with_align's second argument
-   takes bits rather than bytes. */
-#if RBIMPL_HAS_BUILTIN(__builtin_alloca_with_align)
-# define ALLOCA_N(type, n)                              \
-    RBIMPL_CAST((type *)                                 \
-        __builtin_alloca_with_align(                    \
-            rbimpl_size_mul_or_raise(sizeof(type), (n)), \
-            RUBY_ALIGNOF(type) * CHAR_BIT))
-#else
-# define ALLOCA_N(type,n) \
+#define ALLOCA_N(type,n) \
     RBIMPL_CAST((type *)alloca(rbimpl_size_mul_or_raise(sizeof(type), (n))))
-#endif
 
 /* allocates _n_ bytes temporary buffer and stores VALUE including it
  * in _v_.  _n_ may be evaluated twice. */
-- 
cgit v0.10.2


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