void x264_dequant_8x8_flat16_sse2( int16_t dct[64], int dequant_mf[6][64], int i_qp );
void x264_dequant_4x4_flat16_avx2( int16_t dct[16], int dequant_mf[6][16], int i_qp );
void x264_dequant_8x8_flat16_avx2( int16_t dct[64], int dequant_mf[6][64], int i_qp );
+void x264_idct_dequant_2x4_dc_sse2( dctcoef dct[8], dctcoef dct4x4[8][16], int dequant_mf[6][16], int i_qp );
+void x264_idct_dequant_2x4_dc_avx ( dctcoef dct[8], dctcoef dct4x4[8][16], int dequant_mf[6][16], int i_qp );
+void x264_idct_dequant_2x4_dconly_sse2( dctcoef dct[8], int dequant_mf[6][16], int i_qp );
+void x264_idct_dequant_2x4_dconly_avx ( dctcoef dct[8], int dequant_mf[6][16], int i_qp );
int x264_optimize_chroma_2x2_dc_sse2( dctcoef dct[4], int dequant_mf );
int x264_optimize_chroma_2x2_dc_ssse3( dctcoef dct[4], int dequant_mf );
int x264_optimize_chroma_2x2_dc_sse4( dctcoef dct[4], int dequant_mf );