[FFmpeg-devel] [PATCH] avcodec/svq1enc: restrict Altivec acceleration to big-endian POWER configurations (backported to release/7.1) (PR #20285)

[FFmpeg-devel] [PATCH] avcodec/svq1enc: restrict Altivec acceleration to big-endian POWER configurations (backported to release/7.1) (PR #20285)

[Sean McGovern via ffmpeg-devel]

PR #20285 opened by Sean McGovern (sean_mcg)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20285
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20285.patch

This was disabled in da60b99a8857d5ca236f32c1799a066e0135a866 and then
accidentally re-enabled in 172b0e2e88832822632841e8e0d3794f974cbc93.

The code in question was never properly adapted for litte-endian mode.

refs: trac/10955
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 4322be512b2bd6c7d8ee61a2b0230546f3107be0)


From b8dcb682b174b2f1c481d53bb86b6226489ef447 Mon Sep 17 00:00:00 2001
From: Sean McGovern <gseanmcg@gmail.com>
Date: Thu, 16 Jan 2025 16:30:52 -0500
Subject: [PATCH] avcodec/svq1enc: restrict Altivec acceleration to big-endian
 POWER configurations

This was disabled in da60b99a8857d5ca236f32c1799a066e0135a866 and then
accidentally re-enabled in 172b0e2e88832822632841e8e0d3794f974cbc93.

The code in question was never properly adapted for litte-endian mode.

refs: trac/10955
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 4322be512b2bd6c7d8ee61a2b0230546f3107be0)
---
 libavcodec/ppc/svq1enc_altivec.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libavcodec/ppc/svq1enc_altivec.c b/libavcodec/ppc/svq1enc_altivec.c
index 5721bede34..78c79a68dc 100644
--- a/libavcodec/ppc/svq1enc_altivec.c
+++ b/libavcodec/ppc/svq1enc_altivec.c
@@ -29,7 +29,7 @@
 
 #include "libavcodec/svq1encdsp.h"
 
-#if HAVE_ALTIVEC
+#if HAVE_ALTIVEC && HAVE_BIGENDIAN
 static int ssd_int8_vs_int16_altivec(const int8_t *pix1, const int16_t *pix2,
                                      intptr_t size)
 {
@@ -69,14 +69,14 @@ static int ssd_int8_vs_int16_altivec(const int8_t *pix1, const int16_t *pix2,
 
     return u.score[3];
 }
-#endif /* HAVE_ALTIVEC */
+#endif /* HAVE_ALTIVEC && HAVE_BIGENDIAN */
 
 av_cold void ff_svq1enc_init_ppc(SVQ1EncDSPContext *c)
 {
-#if HAVE_ALTIVEC
+#if HAVE_ALTIVEC && HAVE_BIGENDIAN
     if (!PPC_ALTIVEC(av_get_cpu_flags()))
         return;
 
     c->ssd_int8_vs_int16 = ssd_int8_vs_int16_altivec;
-#endif /* HAVE_ALTIVEC */
+#endif /* HAVE_ALTIVEC && HAVE_BIGENDIAN */
 }
-- 
2.49.1

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