1 ;// 2 ;// 3 ;// File Name: omxVCM4P2_FindMVpred_s.s 4 ;// OpenMAX DL: v1.0.2 5 ;// Revision: 12290 6 ;// Date: Wednesday, April 9, 2008 7 ;// 8 ;// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. 9 ;// 10 ;// 11 ;// 12 13 ;// Function: 14 ;// omxVCM4P2_FindMVpred 15 ;// 16 ;// Include headers 17 INCLUDE omxtypes_s.h 18 INCLUDE armCOMM_s.h 19 INCLUDE armVCCOMM_s.h 20 21 ;// Define cpu variants 22 M_VARIANTS CortexA8 23 24 25 IF CortexA8 26 27 M_TABLE armVCM4P2_pBlkIndexTable 28 DCD OMXVCBlk0, OMXVCBlk1 29 DCD OMXVCBlk2, OMXVCBlk3 30 31 ;//-------------------------------------------- 32 ;// Declare input registers 33 ;//-------------------------------------------- 34 35 pSrcMVCurMB RN 0 36 pSrcCandMV1 RN 1 37 pSrcCandMV2 RN 2 38 pSrcCandMV3 RN 3 39 pDstMVPred RN 4 40 pDstMVPredME RN 5 41 iBlk RN 6 42 43 pTable RN 4 44 CandMV RN 12 45 46 pCandMV1 RN 7 47 pCandMV2 RN 8 48 pCandMV3 RN 9 49 50 CandMV1dx RN 0 51 CandMV1dy RN 1 52 CandMV2dx RN 2 53 CandMV2dy RN 3 54 CandMV3dx RN 10 55 CandMV3dy RN 11 56 57 temp RN 14 58 59 zero RN 14 60 return RN 0 61 62 ; ---------------------------------------------- 63 ; Main routine 64 ; ---------------------------------------------- 65 66 M_ALLOC4 MV, 4 67 68 ;// Function header 69 M_START omxVCM4P2_FindMVpred, r11 70 71 ;// Define stack arguments 72 M_ARG ppDstMVPred, 4 73 M_ARG ppDstMVPredME, 4 74 M_ARG Blk, 4 75 76 M_ADR CandMV, MV 77 MOV zero, #0 78 M_LDR iBlk, Blk 79 80 ;// Set the default value for these 81 ;// to be used if pSrcCandMV[1|2|3] == NULL 82 MOV pCandMV1, CandMV 83 MOV pCandMV2, CandMV 84 MOV pCandMV3, CandMV 85 86 STR zero, [CandMV] 87 88 ;// Branch to the case based on blk number 89 M_SWITCH iBlk 90 M_CASE OMXVCBlk0 ;// iBlk=0 91 M_CASE OMXVCBlk1 ;// iBlk=0 92 M_CASE OMXVCBlk2 ;// iBlk=0 93 M_CASE OMXVCBlk3 ;// iBlk=0 94 M_ENDSWITCH 95 96 OMXVCBlk0 97 CMP pSrcCandMV1, #0 98 ADDNE pCandMV1, pSrcCandMV1, #4 99 100 CMP pSrcCandMV2, #0 101 ADDNE pCandMV2, pSrcCandMV2, #8 102 103 CMP pSrcCandMV3, #0 104 ADDNE pCandMV3, pSrcCandMV3, #8 105 CMPEQ pSrcCandMV1, #0 106 107 MOVEQ pCandMV3, pCandMV2 108 MOVEQ pCandMV1, pCandMV2 109 110 CMP pSrcCandMV1, #0 111 CMPEQ pSrcCandMV2, #0 112 113 MOVEQ pCandMV1, pCandMV3 114 MOVEQ pCandMV2, pCandMV3 115 116 CMP pSrcCandMV2, #0 117 CMPEQ pSrcCandMV3, #0 118 119 MOVEQ pCandMV2, pCandMV1 120 MOVEQ pCandMV3, pCandMV1 121 122 B BlkEnd 123 124 OMXVCBlk1 125 MOV pCandMV1, pSrcMVCurMB 126 CMP pSrcCandMV3, #0 127 ADDNE pCandMV3, pSrcCandMV3, #8 128 129 CMP pSrcCandMV2, #0 130 ADDNE pCandMV2, pSrcCandMV2, #12 131 132 CMPEQ pSrcCandMV3, #0 133 134 MOVEQ pCandMV2, pCandMV1 135 MOVEQ pCandMV3, pCandMV1 136 137 B BlkEnd 138 139 OMXVCBlk2 140 CMP pSrcCandMV1, #0 141 MOV pCandMV2, pSrcMVCurMB 142 ADD pCandMV3, pSrcMVCurMB, #4 143 ADDNE pCandMV1, pSrcCandMV1, #12 144 B BlkEnd 145 146 OMXVCBlk3 147 ADD pCandMV1, pSrcMVCurMB, #8 148 MOV pCandMV2, pSrcMVCurMB 149 ADD pCandMV3, pSrcMVCurMB, #4 150 151 BlkEnd 152 153 ;// Using the transperancy info, zero 154 ;// out the candidate MV if neccesary 155 LDRSH CandMV1dx, [pCandMV1], #2 156 LDRSH CandMV2dx, [pCandMV2], #2 157 LDRSH CandMV3dx, [pCandMV3], #2 158 159 ;// Load argument from the stack 160 M_LDR pDstMVPredME, ppDstMVPredME 161 162 LDRSH CandMV1dy, [pCandMV1] 163 LDRSH CandMV2dy, [pCandMV2] 164 LDRSH CandMV3dy, [pCandMV3] 165 166 CMP pDstMVPredME, #0 167 168 ;// Store the candidate MV's into the pDstMVPredME, 169 ;// these can be used in the fast algorithm if implemented 170 171 STRHNE CandMV1dx, [pDstMVPredME], #2 172 STRHNE CandMV1dy, [pDstMVPredME], #2 173 STRHNE CandMV2dx, [pDstMVPredME], #2 174 STRHNE CandMV2dy, [pDstMVPredME], #2 175 STRHNE CandMV3dx, [pDstMVPredME], #2 176 STRHNE CandMV3dy, [pDstMVPredME] 177 178 ; Find the median of the 3 candidate MV's 179 M_MEDIAN3 CandMV1dx, CandMV2dx, CandMV3dx, temp 180 181 ;// Load argument from the stack 182 M_LDR pDstMVPred, ppDstMVPred 183 184 M_MEDIAN3 CandMV1dy, CandMV2dy, CandMV3dy, temp 185 186 STRH CandMV3dx, [pDstMVPred], #2 187 STRH CandMV3dy, [pDstMVPred] 188 189 MOV return, #OMX_Sts_NoErr 190 191 M_END 192 ENDIF ;// ARM1136JS :LOR: CortexA8 193 194 END
