avcodec/mips: loongson optimize h264pred with mmi v3

1. no longer use the register names directly and optimized code format
2. to be compatible with O32, specify type of address variable with mips_reg and handle the address variable with PTR_ operator
3. ff_pred16x16_plane_ functions only support N64 ABI now
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/mips/constants.c

@@ -24,6 +24,7 @@
 #include "constants.h"
 
 DECLARE_ALIGNED(8, const uint64_t, ff_pw_1) =       {0x0001000100010001ULL};
+DECLARE_ALIGNED(8, const uint64_t, ff_pw_2) =       {0x0002000200020002ULL};
 DECLARE_ALIGNED(8, const uint64_t, ff_pw_3) =       {0x0003000300030003ULL};
 DECLARE_ALIGNED(8, const uint64_t, ff_pw_4) =       {0x0004000400040004ULL};
 DECLARE_ALIGNED(8, const uint64_t, ff_pw_5) =       {0x0005000500050005ULL};

libavcodec/mips/constants.h

@@ -25,6 +25,7 @@
 #include <stdint.h>
 
 extern const uint64_t ff_pw_1;
+extern const uint64_t ff_pw_2;
 extern const uint64_t ff_pw_3;
 extern const uint64_t ff_pw_4;
 extern const uint64_t ff_pw_5;

libavcodec/mips/h264pred_init_mips.c

@@ -115,23 +115,22 @@ static av_cold void h264_pred_init_mmi(H264PredContext *h, int codec_id,
         h->pred8x8l [TOP_DC_PRED            ] = ff_pred8x8l_top_dc_8_mmi;
         h->pred8x8l [DC_PRED                ] = ff_pred8x8l_dc_8_mmi;
 
+#if ARCH_MIPS64
         switch (codec_id) {
         case AV_CODEC_ID_SVQ3:
             h->pred16x16[PLANE_PRED8x8      ] = ff_pred16x16_plane_svq3_8_mmi;
-            ;
             break;
         case AV_CODEC_ID_RV40:
             h->pred16x16[PLANE_PRED8x8      ] = ff_pred16x16_plane_rv40_8_mmi;
-            ;
             break;
         case AV_CODEC_ID_VP7:
         case AV_CODEC_ID_VP8:
-            ;
             break;
         default:
             h->pred16x16[PLANE_PRED8x8      ] = ff_pred16x16_plane_h264_8_mmi;
             break;
         }
+#endif
 
         if (codec_id == AV_CODEC_ID_SVQ3 || codec_id == AV_CODEC_ID_H264) {
             if (chroma_format_idc == 1) {