frameworks/base/media/libstagefright/codecs/amrwbenc/src/asm/ARMV5E/Dot_p_opt.s

   1 @/*\r
   2 @ ** Copyright 2003-2010, VisualOn, Inc.\r
   3 @ **\r
   4 @ ** Licensed under the Apache License, Version 2.0 (the "License");\r
   5 @ ** you may not use this file except in compliance with the License.\r
   6 @ ** You may obtain a copy of the License at\r
   7 @ **\r
   8 @ **     http://www.apache.org/licenses/LICENSE-2.0\r
   9 @ **\r
  10 @ ** Unless required by applicable law or agreed to in writing, software\r
  11 @ ** distributed under the License is distributed on an "AS IS" BASIS,\r
  12 @ ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
  13 @ ** See the License for the specific language governing permissions and\r
  14 @ ** limitations under the License.\r
  15 @ */\r
  16 @\r
  17 @Word32 Dot_product12(                      /* (o) Q31: normalized result (1 < val <= -1) */\r
  18 @       Word16 x[],                           /* (i) 12bits: x vector                       */\r
  19 @       Word16 y[],                           /* (i) 12bits: y vector                       */\r
  20 @       Word16 lg,                            /* (i)    : vector length                     */\r
  21 @       Word16 * exp                          /* (o)    : exponent of result (0..+30)       */\r
  22 @)\r
  23 @****************************************************************\r
  24 @  x[]   ---  r0\r
  25 @  y[]   ---  r1\r
  26 @  lg    ---  r2\r
  27 @  *exp  ---  r3\r
  28 \r
  29           .section  .text\r
  30           .global   Dot_product12_asm\r
  31 \r
  32 Dot_product12_asm:\r
  33 \r
  34           STMFD             r13!, {r4 - r12, r14} \r
  35           MOV               r4, #0                                 @ L_sum = 0\r
  36           MOV               r5, #0                                 @ i = 0\r
  37 \r
  38 LOOP:\r
  39           LDR           r6, [r0], #4\r
  40           LDR           r7, [r1], #4\r
  41           LDR           r8, [r0], #4\r
  42           SMLABB        r4, r6, r7, r4\r
  43           LDR           r9, [r1], #4\r
  44           SMLATT        r4, r6, r7, r4 \r
  45 \r
  46           LDR           r6, [r0], #4\r
  47           SMLABB        r4, r8, r9, r4\r
  48 \r
  49           LDR           r7, [r1], #4\r
  50           SMLATT        r4, r8, r9, r4    \r
  51           LDR           r8, [r0], #4\r
  52 \r
  53           SMLABB        r4, r6, r7, r4\r
  54           LDR           r9, [r1], #4\r
  55           SMLATT        r4, r6, r7, r4\r
  56           ADD           r5, r5, #8\r
  57           SMLABB        r4, r8, r9, r4\r
  58           CMP           r5, r2\r
  59           SMLATT        r4, r8, r9, r4\r
  60           BLT           LOOP\r
  61               \r
  62           MOV           r12, r4, LSL #1\r
  63           ADD           r12, r12, #1                         @ L_sum = (L_sum << 1)  + 1\r
  64           MOV           r4, r12\r
  65 \r
  66           CMP           r12, #0\r
  67           RSBLT         r4, r12, #0\r
  68           CLZ           r10, r4\r
  69           SUB           r10, r10, #1                         @ sft = norm_l(L_sum)\r
  70           MOV           r0, r12, LSL r10                     @ L_sum = L_sum << sft\r
  71           RSB           r11, r10, #30                        @ *exp = 30 - sft\r
  72           STRH          r11, [r3]                     \r
  73 \r
  74 Dot_product12_end:\r
  75                      \r
  76           LDMFD             r13!, {r4 - r12, r15} \r
  77           @ENDFUNC\r
  78           .END\r
  79  \r
  80 \r