avcodec: Add prefetch for mips

Signed-off-by: Kaustubh Raste <kaustubh.raste@imgtec.com>
Reviewed-by: Manojkumar Bhosale <Manojkumar.Bhosale@imgtec.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/mips/Makefile

@@ -38,6 +38,7 @@ OBJS-$(CONFIG_ME_CMP)                     += mips/me_cmp_init_mips.o
 OBJS-$(CONFIG_MPEG4_DECODER)              += mips/xvididct_init_mips.o
 OBJS-$(CONFIG_VC1DSP)                     += mips/vc1dsp_init_mips.o
 OBJS-$(CONFIG_WMV2DSP)                    += mips/wmv2dsp_init_mips.o
+OBJS-$(CONFIG_VIDEODSP)                   += mips/videodsp_init.o
 MSA-OBJS-$(CONFIG_HEVC_DECODER)           += mips/hevcdsp_msa.o            \
                                              mips/hevc_mc_uni_msa.o        \
                                              mips/hevc_mc_uniw_msa.o       \

libavcodec/mips/videodsp_init.c

+/*
+ * Copyright (c) 2017 Kaustubh Raste (kaustubh.raste@imgtec.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
+ */
+
+#include "config.h"
+#include "libavutil/attributes.h"
+#include "libavutil/mips/asmdefs.h"
+#include "libavcodec/videodsp.h"
+
+#if HAVE_MSA
+static void prefetch_mips(uint8_t *mem, ptrdiff_t stride, int h)
+{
+    register const uint8_t *p = mem;
+
+    __asm__ volatile (
+        "1:                                     \n\t"
+        "pref          4,  0(%[p])              \n\t"
+        "pref          4,  32(%[p])             \n\t"
+        PTR_ADDIU"  %[h],  %[h],     -1         \n\t"
+        PTR_ADDU "  %[p],  %[p],     %[stride]  \n\t"
+
+        "bnez       %[h],  1b                   \n\t"
+
+        : [p] "+r" (p), [h] "+r" (h)
+        : [stride] "r" (stride)
+    );
+}
+#endif  // #if HAVE_MSA
+
+av_cold void ff_videodsp_init_mips(VideoDSPContext *ctx, int bpc)
+{
+#if HAVE_MSA
+    ctx->prefetch = prefetch_mips;
+#endif  // #if HAVE_MSA
+}

libavcodec/videodsp.c

@@ -52,4 +52,6 @@ av_cold void ff_videodsp_init(VideoDSPContext *ctx, int bpc)
         ff_videodsp_init_ppc(ctx, bpc);
     if (ARCH_X86)
         ff_videodsp_init_x86(ctx, bpc);
+    if (ARCH_MIPS)
+        ff_videodsp_init_mips(ctx, bpc);
 }

libavcodec/videodsp.h

@@ -83,5 +83,6 @@ void ff_videodsp_init_aarch64(VideoDSPContext *ctx, int bpc);
 void ff_videodsp_init_arm(VideoDSPContext *ctx, int bpc);
 void ff_videodsp_init_ppc(VideoDSPContext *ctx, int bpc);
 void ff_videodsp_init_x86(VideoDSPContext *ctx, int bpc);
+void ff_videodsp_init_mips(VideoDSPContext *ctx, int bpc);
 
 #endif /* AVCODEC_VIDEODSP_H */