From 29c4c0886d143790fcbeddbe40a23dfc6f56345c Mon Sep 17 00:00:00 2001
From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Date: Thu, 8 Sep 2022 15:00:06 +0200
Subject: [PATCH] avutil/x86/intreadwrite: Add ability to detect whether MMX
 code is used

It can be used to call emms_c() only when needed.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavutil/x86/intreadwrite.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavutil/x86/intreadwrite.h b/libavutil/x86/intreadwrite.h
index 4061d19231..40f375b013 100644
--- a/libavutil/x86/intreadwrite.h
+++ b/libavutil/x86/intreadwrite.h
@@ -29,6 +29,8 @@
 
 #if !HAVE_FAST_64BIT && defined(__MMX__)
 
+#define FF_COPY_SWAP_ZERO_USES_MMX
+
 #define AV_COPY64 AV_COPY64
 static av_always_inline void AV_COPY64(void *d, const void *s)
 {