From f4facd2ce70b1d07ae2730abfcc050f2acbc3b53 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Wed, 9 Jan 2013 22:57:41 +0200
Subject: [PATCH 1/2] x86: Add a Yasm-based emms() replacement

This provides a fallback when building with Yasm enabled, but neither
inline assembly, nor the _mm_empty intrinsic are available or enabled.

Signed-off-by: Diego Biurrun <diego@biurrun.de>
---
 libavutil/internal.h   |  3 +++
 libavutil/x86/Makefile |  1 +
 libavutil/x86/emms.asm | 30 ++++++++++++++++++++++++++++++
 libavutil/x86/emms.h   | 24 ++++++++++++++++++++++++
 4 files changed, 58 insertions(+)
 create mode 100644 libavutil/x86/emms.asm
 create mode 100644 libavutil/x86/emms.h

diff --git a/libavutil/internal.h b/libavutil/internal.h
index f0f5a635c8..5bc6a085d6 100644
--- a/libavutil/internal.h
+++ b/libavutil/internal.h
@@ -141,6 +141,9 @@ static av_always_inline void emms_c(void)
 #elif HAVE_MMX && HAVE_MM_EMPTY
 #   include <mmintrin.h>
 #   define emms_c _mm_empty
+#elif HAVE_MMX && HAVE_YASM
+#   include "libavutil/x86/emms.h"
+#   define emms_c avpriv_emms_yasm
 #else
 #   define emms_c()
 #endif /* HAVE_MMX_INLINE */
diff --git a/libavutil/x86/Makefile b/libavutil/x86/Makefile
index 3dd696c26a..ae07470b17 100644
--- a/libavutil/x86/Makefile
+++ b/libavutil/x86/Makefile
@@ -2,4 +2,5 @@ OBJS += x86/cpu.o                                                       \
         x86/float_dsp_init.o                                            \
 
 YASM-OBJS += x86/cpuid.o                                                \
+             x86/emms.o                                                 \
              x86/float_dsp.o                                            \
diff --git a/libavutil/x86/emms.asm b/libavutil/x86/emms.asm
new file mode 100644
index 0000000000..a6851acc99
--- /dev/null
+++ b/libavutil/x86/emms.asm
@@ -0,0 +1,30 @@
+;*****************************************************************************
+;* Copyright (C) 2013 Martin Storsjo
+;*
+;* This file is part of Libav.
+;*
+;* Libav is free software; you can redistribute it and/or
+;* modify it under the terms of the GNU Lesser General Public
+;* License as published by the Free Software Foundation; either
+;* version 2.1 of the License, or (at your option) any later version.
+;*
+;* Libav is distributed in the hope that it will be useful,
+;* but WITHOUT ANY WARRANTY; without even the implied warranty of
+;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;* Lesser General Public License for more details.
+;*
+;* You should have received a copy of the GNU Lesser General Public
+;* License along with Libav; if not, write to the Free Software
+;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+;******************************************************************************
+
+%include "x86util.asm"
+
+SECTION .text
+
+;-----------------------------------------------------------------------------
+; void avpriv_emms_yasm(void)
+;-----------------------------------------------------------------------------
+cvisible emms_yasm, 0, 0
+    emms
+    RET
diff --git a/libavutil/x86/emms.h b/libavutil/x86/emms.h
new file mode 100644
index 0000000000..6bb8ca3195
--- /dev/null
+++ b/libavutil/x86/emms.h
@@ -0,0 +1,24 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVUTIL_X86_EMMS_H
+#define AVUTIL_X86_EMMS_H
+
+void avpriv_emms_yasm(void);
+
+#endif /* AVUTIL_X86_EMMS_H */

From 822b0728f0e3c3ba60b20bd4fd971d5c4a3fe3e9 Mon Sep 17 00:00:00 2001
From: Diego Biurrun <diego@biurrun.de>
Date: Wed, 16 Jan 2013 23:50:57 +0100
Subject: [PATCH 2/2] x86: dsputil: Drop some unused macro definitions

---
 libavcodec/x86/dsputil_mmx.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/libavcodec/x86/dsputil_mmx.c b/libavcodec/x86/dsputil_mmx.c
index 7ac6ecb2c4..13f215135a 100644
--- a/libavcodec/x86/dsputil_mmx.c
+++ b/libavcodec/x86/dsputil_mmx.c
@@ -196,14 +196,12 @@ DECLARE_ALIGNED(16, const double, ff_pd_2)[2] = { 2.0, 2.0 };
 
 #define DEF(x) x ## _3dnow
 #define PAVGB "pavgusb"
-#define OP_AVG PAVGB
 #define SKIP_FOR_3DNOW
 
 #include "dsputil_avg_template.c"
 
 #undef DEF
 #undef PAVGB
-#undef OP_AVG
 #undef SKIP_FOR_3DNOW
 
 /***********************************/
@@ -213,13 +211,11 @@ DECLARE_ALIGNED(16, const double, ff_pd_2)[2] = { 2.0, 2.0 };
 
 /* Introduced only in MMXEXT set */
 #define PAVGB "pavgb"
-#define OP_AVG PAVGB
 
 #include "dsputil_avg_template.c"
 
 #undef DEF
 #undef PAVGB
-#undef OP_AVG
 
 #define put_no_rnd_pixels16_mmx put_pixels16_mmx
 #define put_no_rnd_pixels8_mmx put_pixels8_mmx