ac_vld_decode_h.asm

h263,jpeg,mpeg2编解码核心程序(TI DSP C64xx)

        .asg            B0,         B_len_cw
        .asg            A1,         A_len_val
        .asg            A23,        A_temp_ac
        .asg            B0,         B_sgn
        .asg            B26,        B_Neg_AC
        .asg            A18,        A_shift
        .asg            A3,         A_level_val
        .asg            B0,         B_Neg_s
        .asg            B26,        B_run_temp
        .asg            B0,         B_st1
        .asg            B0,         B_data_word_cpy_s
        .asg            A3,         A_bytes
        .asg            A19,        A_num_bytes
        .asg            A1,         A_data_sh
        .asg            A0,         A_data_sl
        .asg            B26,        B_data_sl
        .asg            B7,         B_K_63
        .asg            B3,         B_return

; ============================================================================
; START:
; ============================ PIPE LOOP PROLOG ==============================
; PROLOG:

        LMBD    .L1   0,                   A_data_word_val,A_lmbd_val  ;[ 1,1]

        SHRU    .S2X  A_data_word_val,     26,             B_t02_ofs   ;[ 2,1]
||      CMPLTU  .L1   A_lmbd_val, 3,       A_st3                       ;[ 2,1]
||      LDNDW   .D    *+A_data_pointer(1), A_temp_h:A_temp_l           ;[ 2,1]

        LMBD    .L2   0,                   B_data_word_cpy,B_lmbd_val  ;[ 3,1]
||      EXTU    .S2   B_data_word_cpy,     3,  26,         B_ofs       ;[ 3,1]
||      LDBU    .D1T1 *A_data_pointer,     A_new_hi                    ;[ 3,1]

        CMPGTU  .L2   B_lmbd_val,          5,              B_st5       ;[ 4,1]
||      EXTU    .S2   B_data_word_cpy,     5,  25,         B_t68_ofs   ;[ 4,1]
||[ A_st3]SUBAW .D2   B_t02_ofs,  14,      B_ofs                       ;[ 4,1]

  [ B_st5]MV    .D2   B_t68_ofs,           B_ofs                       ;[ 5,1]
||      EXTU    .S2   B_data_word_cpy,     8,  24,         B_t9x_ofs   ;[ 5,1]
||      CMPGTU  .L1   A_lmbd_val,          8,              A_st8       ;[ 5,1]

  [ A_st8]MV    .D2   B_t9x_ofs,           B_ofs                       ;[ 6,1]

        LDBU    .D2T1 *+B_shf_tbl[B_ofs],  A_len_cw                    ;[ 7,1]
||      SWAP4   .L1   A_temp_l,            A_temp_swap_l               ;[ 7,1]

        PACKLH2 .L1   A_temp_swap_l,       A_temp_swap_l,  A_new_lo    ;[ 8,1]
||      LDBU    .D2T2 *+B_sze_tbl[B_ofs],  B_size_val                  ;[ 8,1]

        LDBU    .D2T2 *+B_run_tbl[B_ofs],  B_run_val                   ;[ 9,1]

        NOP           2

        SUB     .D1   A_bit_pos_val,       A_len_cw,   A_bit_pos_val   ;[12,1]
||      SHL     .S1   A_data_word_val,     A_len_cw,   A_data_word_val ;[12,1]
||      SUB     .L1   A_shift_new,         A_len_cw,   A_shift_new     ;[12,1]

; ============================ PIPE LOOP KERNEL ==============================
LOOP:
        SUB     .L1   A_const_32,        A_bit_pos_val,   A_bytes      ;[13,1]
||      SHRU    .S1   A_new_hi:A_new_lo, A_shift_new,A_data_sh:A_data_sl;[13,1
||      MV      .D2X  A_len_cw,          B_len_cw                      ;[13,1]

        ADD     .L2   B_run_val,         1,               B_run_temp   ;[14,1]
||      MV      .D2X  A_data_word_val,   B_data_word_cpy_s             ;[14,1]
||      SUB     .L1X  A_len_cw,          B_size_val,      A_len_val    ;[14,1]
||      SHRU    .S1   A_bytes,           3,               A_num_bytes  ;[14,1]
||      OR      .D1   A_data_word_val,   A_data_sl,     A_data_word_val;[14,1]
||      AND     .S2   B_data_word_cpy,   B_EOB_MASK,      B_EOB_VAL    ;[14,1]

        ADD     .D1   A_used_bytes_val,  A_num_bytes,  A_used_bytes_val;[15,1]
||      ADD     .S2   B_num_coeffs,      B_run_temp,   B_num_coeffs    ;[15,1]
||      ADD     .S1   A_data_pointer,    A_num_bytes,  A_data_pointer  ;[15,1]
||      MV      .D2X  A_data_sl,         B_data_sl                     ;[15,1]
||      LMBD    .L1   0,                 A_data_word_val, A_lmbd_val   ;[ 1,2]

        SHL     .S1X  B_data_word_cpy,  A_len_val,       A_temp_ac     ;[16,1]
||      OR      .D2   B_data_word_cpy_s,B_data_sl,     B_data_word_cpy ;[16,1]
||      CMPGT   .L2   B_num_coeffs,     B_K_62,          B_st1         ;[16,1]
||      SHRU    .S2X  A_data_word_val,  26,              B_t02_ofs     ;[ 2,2]
||      CMPLTU  .L1   A_lmbd_val, 3,     A_st3                         ;[ 2,2]
||      LDNDW   .D    *+A_data_pointer(1),A_temp_h:A_temp_l            ;[ 2,2]

        SUB     .S1X  A_const_32,        B_size_val,     A_shift       ;[17,1]
||      LMBD    .L2   0,                 B_data_word_cpy,B_lmbd_val    ;[ 3,2]
||      EXTU    .S2   B_data_word_cpy,   3, 26,          B_ofs         ;[ 3,2]
||      LDBU    .D1T1 *A_data_pointer,   A_new_hi                      ;[ 3,2]

        CMPGTU  .L2   B_lmbd_val,        5,             B_st5          ;[ 4,2]
||      EXTU    .S2   B_data_word_cpy,   5,25,          B_t68_ofs      ;[ 4,2]
||[ A_st3]SUBAW .D2   B_t02_ofs,         14,            B_ofs          ;[ 4,2]

        CMPEQ   .L2X  B_EOB_VAL,         A_EOB_CODE,    B_EOB          ;[19,1]
||      MPY     .M1   A_num_bytes,       8,             A_num_bytes    ;[19,1]
||[ B_st5]MV    .D2   B_t68_ofs,         B_ofs                         ;[ 5,2]
||      EXTU    .S2   B_data_word_cpy,   8,24,          B_t9x_ofs      ;[ 5,2]
||      CMPGTU  .L1   A_lmbd_val,        8,             A_st8          ;[ 5,2]

        SHR     .S2X  A_temp_ac,         31,            B_sgn          ;[20,1]
||      STH     .D1T2 B_run_val,         *A_run++[2]                   ;[20,1]
||[ B_st1]MV    .L2   B_st1,             B_EOB                         ;[20,1]
||[ A_st8]MV    .D2   B_t9x_ofs,         B_ofs                         ;[ 6,2]

  [!B_EOB]B     .S2   LOOP                                             ;[21,1]
||      ADD     .L2   B_sgn,             1,             B_Neg_AC       ;[21,1]
||      LDBU    .D2T1 *+B_shf_tbl[B_ofs],A_len_cw                      ;[ 7,2]
||      SWAP4   .L1   A_temp_l,          A_temp_swap_l                 ;[ 7,2]

        SHL     .S2   B_Neg_AC,          B_size_val,    B_Neg_s        ;[22,1]
||      SHRU    .S1   A_temp_ac,         A_shift,       A_level_val    ;[22,1]
||      PACKLH2 .L1   A_temp_swap_l,     A_temp_swap_l, A_new_lo       ;[ 8,2]
||      LDBU    .D2T2 *+B_sze_tbl[B_ofs],B_size_val                    ;[ 8,2]

        ADD     .S1X  A_level_val,       B_Neg_AC,      A_level_val    ;[23,1]
||      LDBU    .D2T2 *+B_run_tbl[B_ofs],B_run_val                     ;[ 9,2]

        SUB     .S1X  A_level_val,       B_Neg_s,       A_level_val    ;[24,1]
||[B_EOB]STW    .D1T1 A_data_pointer,    *A_data_ptr                   ;[ 4,0]
||[B_EOB]B      .S2   B_return                                         ;[ 4,0]

        STH     .D2T1 A_level_val,       *B_level++[2]                 ;[25,1]
||      ADD     .D1   A_bit_pos_val,     A_num_bytes,   A_bit_pos_val  ;[25,1]
||      ADD     .L1   A_shift_new,       A_num_bytes,   A_shift_new    ;[25,1]
||      ADD     .L2   B_numberval,       1,             B_numberval    ;[25,1]
||[B_EOB]MVK    .S2   63,                B_K_63                        ;[ 5,0]

  [!B_EOB]SUB   .D1   A_bit_pos_val,     A_len_cw,      A_bit_pos_val  ;[12,2]
||[!B_EOB]SHL   .S1   A_data_word_val,   A_len_cw,      A_data_word_val;[12,2]
||[!B_EOB]SUB   .L1   A_shift_new,       A_len_cw,      A_shift_new    ;[12,2]
||[B_EOB] STW   .D2T1 A_data_word_val,   *B_data_word                  ;[ 5,0]

; ============================ PIPE LOOP EPILOG ==============================
; EPILOG:

; ====================== SYMBOLIC REGISTER ASSIGNMENTS =======================
        .asg            B22,        B_numberval
        .asg            A21,        A_bit_pos_val
        .asg            A9,         A_used_bytes_val
        .asg            A20,        A_data_word_val
        .asg            A16,        A_data_pointer
        .asg            B24,        B_num_coeffs
        .asg            B6,         B_num_of_rles
        .asg            A8,         A_bit_position
        .asg            B8,         B_used_up_bytes
        .asg            B4,         B_data_word
        .asg            A4,         A_data_ptr
        .asg            B3,         B_return
        .asg            A4,         A_fun_ret
        .asg            B7,         B_store
        .asg            B7,         B_K_63
        .asg            B5,         B_st1
; ============================================================================
        STW     .D2T1 A_used_bytes_val,      *B_used_up_bytes       ;[ 6,0]
||      CMPGT   .L2   B_num_coeffs,           B_K_63,     B_st1     ;[ 6,0]

        STB     .D1T1 A_bit_pos_val,          *A_bit_position       ;[ 7,0]
||      SUB     .D2   B_numberval,            1,          B_store   ;[ 7,0]

        STB     .D2T2 B_store,    *B_num_of_rles                    ;[ 8,0]
||      MV      .L1X  B_st1,      A_fun_ret                         ;[ 8,0]

        ;==== Branch occurs

*==============================================================================*
*=  End of file:  ac_vld_decode_h.asm                                         =*
*==============================================================================*
*      Copyright (C) 1997-1999 Texas Instruments Incorporated.                 *
*                           All Rights Reserved                                *
*==============================================================================*