https://git.ruby-lang.org/ruby.git/commit/?id=16ce578da1

From 16ce578da1aee4f4a365a4010dc904bc2f3c4ff9 Mon Sep 17 00:00:00 2001
From: Rei Odaira <rodaira@u...>
Date: Mon, 4 Oct 2021 23:06:43 -0500
Subject: Enable inline assembly of SET_MACHINE_STACK_END on AIX

---
 gc.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gc.h b/gc.h
index 63c60f5765..1ae7733e53 100644
--- a/gc.h
+++ b/gc.h
@@ -6,8 +6,10 @@ https://github.com/ruby/ruby/blob/trunk/gc.h#L6
 #define SET_MACHINE_STACK_END(p) __asm__ __volatile__ ("movq\t%%rsp, %0" : "=r" (*(p)))
 #elif defined(__i386) && defined(__GNUC__)
 #define SET_MACHINE_STACK_END(p) __asm__ __volatile__ ("movl\t%%esp, %0" : "=r" (*(p)))
-#elif defined(__powerpc64__) && defined(__GNUC__)
+#elif (defined(__powerpc__) || defined(__powerpc64__)) && defined(__GNUC__) && !defined(_AIX)
 #define SET_MACHINE_STACK_END(p) __asm__ __volatile__ ("mr\t%0, %%r1" : "=r" (*(p)))
+#elif (defined(__powerpc__) || defined(__powerpc64__)) && defined(__GNUC__) && defined(_AIX)
+#define SET_MACHINE_STACK_END(p) __asm__ __volatile__ ("mr %0,1" : "=r" (*(p)))
 #elif defined(__aarch64__) && defined(__GNUC__)
 #define SET_MACHINE_STACK_END(p) __asm__ __volatile__ ("mov\t%0, sp" : "=r" (*(p)))
 #else
-- 
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