1 @/* 2 @ ** Copyright 2003-2010, VisualOn, Inc. 3 @ ** 4 @ ** Licensed under the Apache License, Version 2.0 (the "License"); 5 @ ** you may not use this file except in compliance with the License. 6 @ ** You may obtain a copy of the License at 7 @ ** 8 @ ** http://www.apache.org/licenses/LICENSE-2.0 9 @ ** 10 @ ** Unless required by applicable law or agreed to in writing, software 11 @ ** distributed under the License is distributed on an "AS IS" BASIS, 12 @ ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 @ ** See the License for the specific language governing permissions and 14 @ ** limitations under the License. 15 @ */ 16 17 @static void Norm_Corr (Word16 exc[], /* (i) : excitation buffer */ 18 @ Word16 xn[], /* (i) : target vector */ 19 @ Word16 h[], /* (i) Q15 : impulse response of synth/wgt filters */ 20 @ Word16 L_subfr, /* (i) : sub-frame length */ 21 @ Word16 t_min, /* (i) : minimum value of pitch lag. */ 22 @ Word16 t_max, /* (i) : maximum value of pitch lag. */ 23 @ Word16 corr_norm[]) /* (o) Q15 : normalized correlation */ 24 @ 25 26 @ r0 --- exc[] 27 @ r1 --- xn[] 28 @ r2 --- h[] 29 @ r3 --- L_subfr 30 @ r4 --- t_min 31 @ r5 --- t_max 32 @ r6 --- corr_norm[] 33 34 35 .section .text 36 .global Norm_corr_asm 37 .extern Convolve_asm 38 .extern Isqrt_n 39 @****************************** 40 @ constant 41 @****************************** 42 .equ EXC , 0 43 .equ XN , 4 44 .equ H , 8 45 .equ L_SUBFR , 12 46 .equ voSTACK , 172 47 .equ T_MIN , 212 48 .equ T_MAX , 216 49 .equ CORR_NORM , 220 50 51 Norm_corr_asm: 52 53 STMFD r13!, {r4 - r12, r14} 54 SUB r13, r13, #voSTACK 55 56 ADD r8, r13, #20 @get the excf[L_SUBFR] 57 LDR r4, [r13, #T_MIN] @get t_min 58 RSB r11, r4, #0 @k = -t_min 59 ADD r5, r0, r11, LSL #1 @get the &exc[k] 60 61 @transfer Convolve function 62 STMFD sp!, {r0 - r3} 63 MOV r0, r5 64 MOV r1, r2 65 MOV r2, r8 @r2 --- excf[] 66 BL Convolve_asm 67 LDMFD sp!, {r0 - r3} 68 69 @ r8 --- excf[] 70 71 MOV r14, r1 @copy xn[] address 72 MOV r5, #64 73 MOV r6, #0 @L_tmp = 0 74 MOV r7, #1 75 76 LOOP1: 77 LDR r9, [r14], #4 78 LDR r10, [r14], #4 79 LDR r11, [r14], #4 80 LDR r12, [r14], #4 81 SMLABB r6, r9, r9, r6 @L_tmp += (xn[i] * xn[i]) 82 SMLATT r6, r9, r9, r6 @L_tmp += (xn[i+1] * xn[i+1]) 83 SMLABB r6, r10, r10, r6 84 SMLATT r6, r10, r10, r6 85 SMLABB r6, r11, r11, r6 86 SMLATT r6, r11, r11, r6 87 SMLABB r6, r12, r12, r6 88 SMLATT r6, r12, r12, r6 89 SUBS r5, r5, #8 90 BNE LOOP1 91 92 ADD r9, r7, r6, LSL #1 @L_tmp = (L_tmp << 1) + 1 93 CLZ r7, r9 94 SUB r6, r7, #1 @exp = norm_l(L_tmp) 95 RSB r7, r6, #32 @exp = 32 - exp 96 MOV r6, r7, ASR #1 97 RSB r7, r6, #0 @scale = -(exp >> 1) 98 99 @loop for every possible period 100 @for(t = t_min@ t <= t_max@ t++) 101 @r7 --- scale r4 --- t_min r8 --- excf[] 102 103 LOOPFOR: 104 MOV r5, #0 @L_tmp = 0 105 MOV r6, #0 @L_tmp1 = 0 106 MOV r9, #64 107 MOV r12, r1 @copy of xn[] 108 ADD r14, r13, #20 @copy of excf[] 109 MOV r8, #0x8000 110 111 LOOPi: 112 LDR r11, [r14], #4 @load excf[i], excf[i+1] 113 LDR r10, [r12], #4 @load xn[i], xn[i+1] 114 SMLABB r6, r11, r11, r6 @L_tmp1 += excf[i] * excf[i] 115 SMLATT r6, r11, r11, r6 @L_tmp1 += excf[i+1] * excf[i+1] 116 SMLABB r5, r10, r11, r5 @L_tmp += xn[i] * excf[i] 117 SMLATT r5, r10, r11, r5 @L_tmp += xn[i+1] * excf[i+1] 118 LDR r11, [r14], #4 @load excf[i+2], excf[i+3] 119 LDR r10, [r12], #4 @load xn[i+2], xn[i+3] 120 SMLABB r6, r11, r11, r6 121 SMLATT r6, r11, r11, r6 122 SMLABB r5, r10, r11, r5 123 SMLATT r5, r10, r11, r5 124 SUBS r9, r9, #4 125 BNE LOOPi 126 127 @r5 --- L_tmp, r6 --- L_tmp1 128 MOV r10, #1 129 ADD r5, r10, r5, LSL #1 @L_tmp = (L_tmp << 1) + 1 130 ADD r6, r10, r6, LSL #1 @L_tmp1 = (L_tmp1 << 1) + 1 131 132 CLZ r10, r5 133 CMP r5, #0 134 RSBLT r11, r5, #0 135 CLZLT r10, r11 136 SUB r10, r10, #1 @exp = norm_l(L_tmp) 137 138 MOV r5, r5, LSL r10 @L_tmp = (L_tmp << exp) 139 RSB r10, r10, #30 @exp_corr = 30 - exp 140 MOV r11, r5, ASR #16 @corr = extract_h(L_tmp) 141 142 CLZ r5, r6 143 SUB r5, r5, #1 144 MOV r6, r6, LSL r5 @L_tmp = (L_tmp1 << exp) 145 RSB r5, r5, #30 @exp_norm = 30 - exp 146 147 @r10 --- exp_corr, r11 --- corr 148 @r6 --- L_tmp, r5 --- exp_norm 149 150 @Isqrt_n(&L_tmp, &exp_norm) 151 152 MOV r14, r0 153 MOV r12, r1 154 155 STMFD sp!, {r0 - r4, r7 - r12, r14} 156 ADD r1, sp, #4 157 ADD r0, sp, #0 158 STR r6, [sp] 159 STRH r5, [sp, #4] 160 BL Isqrt_n 161 LDR r6, [sp] 162 LDRSH r5, [sp, #4] 163 LDMFD sp!, {r0 - r4, r7 - r12, r14} 164 MOV r0, r14 165 MOV r1, r12 166 167 168 MOV r6, r6, ASR #16 @norm = extract_h(L_tmp) 169 MUL r12, r6, r11 170 ADD r12, r12, r12 @L_tmp = vo_L_mult(corr, norm) 171 172 ADD r6, r10, r5 173 ADD r6, r6, r7 @exp_corr + exp_norm + scale 174 175 CMP r6, #0 176 RSBLT r6, r6, #0 177 MOVLT r12, r12, ASR r6 178 MOVGT r12, r12, LSL r6 @L_tmp = L_shl(L_tmp, exp_corr + exp_norm + scale) 179 180 ADD r12, r12, r8 181 MOV r12, r12, ASR #16 @vo_round(L_tmp) 182 183 LDR r5, [r13, #CORR_NORM] @ get corr_norm address 184 LDR r6, [r13, #T_MAX] @ get t_max 185 ADD r10, r5, r4, LSL #1 @ get corr_norm[t] address 186 STRH r12, [r10] @ corr_norm[t] = vo_round(L_tmp) 187 188 CMP r4, r6 189 BEQ Norm_corr_asm_end 190 191 ADD r4, r4, #1 @ t_min ++ 192 193 RSB r5, r4, #0 @ k 194 195 MOV r6, #63 @ i = 63 196 MOV r8, r0 @ exc[] 197 MOV r9, r2 @ h[] 198 ADD r10, r13, #20 @ excf[] 199 200 ADD r8, r8, r5, LSL #1 @ exc[k] address 201 ADD r9, r9, r6, LSL #1 @ h[i] address 202 ADD r10, r10, r6, LSL #1 @ excf[i] address 203 LDRSH r11, [r8] @ tmp = exc[k] 204 205 LOOPK: 206 LDRSH r8, [r9], #-2 @ load h[i] 207 LDRSH r12, [r10, #-2] @ load excf[i - 1] 208 MUL r14, r11, r8 209 MOV r8, r14, ASR #15 210 ADD r14, r8, r12 211 STRH r14, [r10], #-2 212 SUBS r6, r6, #1 213 BGT LOOPK 214 215 LDRSH r8, [r9] @ load h[0] 216 MUL r14, r11, r8 217 LDR r6, [r13, #T_MAX] @ get t_max 218 MOV r8, r14, ASR #15 219 STRH r8, [r10] 220 221 CMP r4, r6 222 BLE LOOPFOR 223 224 Norm_corr_asm_end: 225 226 ADD r13, r13, #voSTACK 227 LDMFD r13!, {r4 - r12, r15} 228 229 .END 230 231 232
