mips: Optimization of AC3 FP encoder and EAC3 FP decoder

Signed-off-by: Bojan Zivkovic <bojan@mips.com>
Reveiwed-by: Vitor Sessak <vitor1001@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

doc/mips.txt

@@ -45,8 +45,10 @@ Example of copyright notice:
 Files that have MIPS copyright notice in them:
 ===============================================
 * libavutil/mips/
+      float_dsp_mips.c
       libm_mips.h
 * libavcodec/mips/
+      ac3dsp_mips.c
       acelp_filters_mips.c
       acelp_vectors_mips.c
       amrwbdec_mips.c

libavcodec/ac3dsp.c

@@ -258,4 +258,6 @@ av_cold void ff_ac3dsp_init(AC3DSPContext *c, int bit_exact)
         ff_ac3dsp_init_arm(c, bit_exact);
     if (ARCH_X86)
         ff_ac3dsp_init_x86(c, bit_exact);
+    if (ARCH_MIPS)
+        ff_ac3dsp_init_mips(c, bit_exact);
 }

libavcodec/ac3dsp.h

@@ -139,5 +139,6 @@ typedef struct AC3DSPContext {
 void ff_ac3dsp_init    (AC3DSPContext *c, int bit_exact);
 void ff_ac3dsp_init_arm(AC3DSPContext *c, int bit_exact);
 void ff_ac3dsp_init_x86(AC3DSPContext *c, int bit_exact);
+void ff_ac3dsp_init_mips(AC3DSPContext *c, int bit_exact);
 
 #endif /* AVCODEC_AC3DSP_H */

libavcodec/mips/Makefile

@@ -13,3 +13,4 @@ OBJS-$(CONFIG_FFT)                        += mips/fft_init_table.o
 MIPSFPU-OBJS-$(CONFIG_FFT)                += mips/fft_mips.o
 MIPSFPU-OBJS                              += mips/dsputil_mips.o           \
                                              mips/fmtconvert_mips.o
+OBJS-$(CONFIG_AC3DSP)                     += mips/ac3dsp_mips.o

libavutil/float_dsp.c

@@ -50,5 +50,7 @@ void avpriv_float_dsp_init(AVFloatDSPContext *fdsp, int bit_exact)
     ff_float_dsp_init_ppc(fdsp, bit_exact);
 #elif ARCH_X86
     ff_float_dsp_init_x86(fdsp);
+#elif ARCH_MIPS
+    ff_float_dsp_init_mips(fdsp);
 #endif
 }

libavutil/float_dsp.h

@@ -65,5 +65,6 @@ void avpriv_float_dsp_init(AVFloatDSPContext *fdsp, int strict);
 void ff_float_dsp_init_arm(AVFloatDSPContext *fdsp);
 void ff_float_dsp_init_ppc(AVFloatDSPContext *fdsp, int strict);
 void ff_float_dsp_init_x86(AVFloatDSPContext *fdsp);
+void ff_float_dsp_init_mips(AVFloatDSPContext *fdsp);
 
 #endif /* AVUTIL_FLOAT_DSP_H */

libavutil/mips/Makefile

+MIPSFPU-OBJS-$(HAVE_INLINE_ASM) += mips/float_dsp_mips.o

libavutil/mips/float_dsp_mips.c

+/*
+ * Copyright (c) 2012
+ *      MIPS Technologies, Inc., California.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Author:  Branimir Vasic (bvasic@mips.com)
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Reference: libavutil/float_dsp.c
+ */
+
+#include "libavutil/float_dsp.h"
+
+static void vector_fmul_mips(float *dst, const float *src0, const float *src1,
+                             int len)
+{
+    int i;
+
+    if (len & 3) {
+        for (i = 0; i < len; i++)
+            dst[i] = src0[i] * src1[i];
+    } else {
+        float *d     = (float *)dst;
+        float *d_end = d + len;
+        float *s0    = (float *)src0;
+        float *s1    = (float *)src1;
+
+        float src0_0, src0_1, src0_2, src0_3;
+        float src1_0, src1_1, src1_2, src1_3;
+
+        __asm__ volatile (
+            "1:                                         \n\t"
+            "lwc1   %[src0_0],  0(%[s0])                \n\t"
+            "lwc1   %[src1_0],  0(%[s1])                \n\t"
+            "lwc1   %[src0_1],  4(%[s0])                \n\t"
+            "lwc1   %[src1_1],  4(%[s1])                \n\t"
+            "lwc1   %[src0_2],  8(%[s0])                \n\t"
+            "lwc1   %[src1_2],  8(%[s1])                \n\t"
+            "lwc1   %[src0_3],  12(%[s0])               \n\t"
+            "lwc1   %[src1_3],  12(%[s1])               \n\t"
+            "mul.s  %[src0_0],  %[src0_0],  %[src1_0]   \n\t"
+            "mul.s  %[src0_1],  %[src0_1],  %[src1_1]   \n\t"
+            "mul.s  %[src0_2],  %[src0_2],  %[src1_2]   \n\t"
+            "mul.s  %[src0_3],  %[src0_3],  %[src1_3]   \n\t"
+            "swc1   %[src0_0],  0(%[d])                 \n\t"
+            "swc1   %[src0_1],  4(%[d])                 \n\t"
+            "swc1   %[src0_2],  8(%[d])                 \n\t"
+            "swc1   %[src0_3],  12(%[d])                \n\t"
+            "addiu  %[s0],      %[s0],      16          \n\t"
+            "addiu  %[s1],      %[s1],      16          \n\t"
+            "addiu  %[d],       %[d],       16          \n\t"
+            "bne    %[d],       %[d_end],   1b          \n\t"
+
+            : [src0_0]"=&f"(src0_0), [src0_1]"=&f"(src0_1),
+              [src0_2]"=&f"(src0_2), [src0_3]"=&f"(src0_3),
+              [src1_0]"=&f"(src1_0), [src1_1]"=&f"(src1_1),
+              [src1_2]"=&f"(src1_2), [src1_3]"=&f"(src1_3),
+              [d]"+r"(d), [s0]"+r"(s0), [s1]"+r"(s1)
+            : [d_end]"r"(d_end)
+            : "memory"
+        );
+    }
+}
+
+void ff_float_dsp_init_mips(AVFloatDSPContext *fdsp) {
+    fdsp->vector_fmul = vector_fmul_mips;
+}