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| 1 ; | |
| 2 ; Copyright (c) 2011 The WebM project authors. All Rights Reserved. | |
| 3 ; | |
| 4 ; Use of this source code is governed by a BSD-style license | |
| 5 ; that can be found in the LICENSE file in the root of the source | |
| 6 ; tree. An additional intellectual property rights grant can be found | |
| 7 ; in the file PATENTS. All contributing project authors may | |
| 8 ; be found in the AUTHORS file in the root of the source tree. | |
| 9 ; | |
| 10 | |
| 11 | |
| 12 EXPORT |vp8_fast_quantize_b_armv6| | |
| 13 | |
| 14 INCLUDE vp8_asm_enc_offsets.asm | |
| 15 | |
| 16 ARM | |
| 17 REQUIRE8 | |
| 18 PRESERVE8 | |
| 19 | |
| 20 AREA ||.text||, CODE, READONLY, ALIGN=2 | |
| 21 | |
| 22 ; r0 BLOCK *b | |
| 23 ; r1 BLOCKD *d | |
| 24 |vp8_fast_quantize_b_armv6| PROC | |
| 25 stmfd sp!, {r1, r4-r11, lr} | |
| 26 | |
| 27 ldr r3, [r0, #vp8_block_coeff] ; coeff | |
| 28 ldr r4, [r0, #vp8_block_quant_fast] ; quant_fast | |
| 29 ldr r5, [r0, #vp8_block_round] ; round | |
| 30 ldr r6, [r1, #vp8_blockd_qcoeff] ; qcoeff | |
| 31 ldr r7, [r1, #vp8_blockd_dqcoeff] ; dqcoeff | |
| 32 ldr r8, [r1, #vp8_blockd_dequant] ; dequant | |
| 33 | |
| 34 ldr r2, loop_count ; loop_count=0x1000000. 'lsls' instruction | |
| 35 ; is used to update the counter so that | |
| 36 ; it can be used to mark nonzero | |
| 37 ; quantized coefficient pairs. | |
| 38 | |
| 39 mov r1, #0 ; flags for quantized coeffs | |
| 40 | |
| 41 ; PART 1: quantization and dequantization loop | |
| 42 loop | |
| 43 ldr r9, [r3], #4 ; [z1 | z0] | |
| 44 ldr r10, [r5], #4 ; [r1 | r0] | |
| 45 ldr r11, [r4], #4 ; [q1 | q0] | |
| 46 | |
| 47 ssat16 lr, #1, r9 ; [sz1 | sz0] | |
| 48 eor r9, r9, lr ; [z1 ^ sz1 | z0 ^ sz0] | |
| 49 ssub16 r9, r9, lr ; x = (z ^ sz) - sz | |
| 50 sadd16 r9, r9, r10 ; [x1+r1 | x0+r0] | |
| 51 | |
| 52 ldr r12, [r3], #4 ; [z3 | z2] | |
| 53 | |
| 54 smulbb r0, r9, r11 ; [(x0+r0)*q0] | |
| 55 smultt r9, r9, r11 ; [(x1+r1)*q1] | |
| 56 | |
| 57 ldr r10, [r5], #4 ; [r3 | r2] | |
| 58 | |
| 59 ssat16 r11, #1, r12 ; [sz3 | sz2] | |
| 60 eor r12, r12, r11 ; [z3 ^ sz3 | z2 ^ sz2] | |
| 61 pkhtb r0, r9, r0, asr #16 ; [y1 | y0] | |
| 62 ldr r9, [r4], #4 ; [q3 | q2] | |
| 63 ssub16 r12, r12, r11 ; x = (z ^ sz) - sz | |
| 64 | |
| 65 sadd16 r12, r12, r10 ; [x3+r3 | x2+r2] | |
| 66 | |
| 67 eor r0, r0, lr ; [(y1 ^ sz1) | (y0 ^ sz0)] | |
| 68 | |
| 69 smulbb r10, r12, r9 ; [(x2+r2)*q2] | |
| 70 smultt r12, r12, r9 ; [(x3+r3)*q3] | |
| 71 | |
| 72 ssub16 r0, r0, lr ; x = (y ^ sz) - sz | |
| 73 | |
| 74 cmp r0, #0 ; check if zero | |
| 75 orrne r1, r1, r2, lsr #24 ; add flag for nonzero coeffs | |
| 76 | |
| 77 str r0, [r6], #4 ; *qcoeff++ = x | |
| 78 ldr r9, [r8], #4 ; [dq1 | dq0] | |
| 79 | |
| 80 pkhtb r10, r12, r10, asr #16 ; [y3 | y2] | |
| 81 eor r10, r10, r11 ; [(y3 ^ sz3) | (y2 ^ sz2)] | |
| 82 ssub16 r10, r10, r11 ; x = (y ^ sz) - sz | |
| 83 | |
| 84 cmp r10, #0 ; check if zero | |
| 85 orrne r1, r1, r2, lsr #23 ; add flag for nonzero coeffs | |
| 86 | |
| 87 str r10, [r6], #4 ; *qcoeff++ = x | |
| 88 ldr r11, [r8], #4 ; [dq3 | dq2] | |
| 89 | |
| 90 smulbb r12, r0, r9 ; [x0*dq0] | |
| 91 smultt r0, r0, r9 ; [x1*dq1] | |
| 92 | |
| 93 smulbb r9, r10, r11 ; [x2*dq2] | |
| 94 smultt r10, r10, r11 ; [x3*dq3] | |
| 95 | |
| 96 lsls r2, r2, #2 ; update loop counter | |
| 97 strh r12, [r7, #0] ; dqcoeff[0] = [x0*dq0] | |
| 98 strh r0, [r7, #2] ; dqcoeff[1] = [x1*dq1] | |
| 99 strh r9, [r7, #4] ; dqcoeff[2] = [x2*dq2] | |
| 100 strh r10, [r7, #6] ; dqcoeff[3] = [x3*dq3] | |
| 101 add r7, r7, #8 ; dqcoeff += 8 | |
| 102 bne loop | |
| 103 | |
| 104 ; PART 2: check position for eob... | |
| 105 ldr r11, [sp, #0] ; restore BLOCKD pointer | |
| 106 mov lr, #0 ; init eob | |
| 107 cmp r1, #0 ; coeffs after quantization? | |
| 108 ldr r12, [r11, #vp8_blockd_eob] | |
| 109 beq end ; skip eob calculations if all zero | |
| 110 | |
| 111 ldr r0, [r11, #vp8_blockd_qcoeff] | |
| 112 | |
| 113 ; check shortcut for nonzero qcoeffs | |
| 114 tst r1, #0x80 | |
| 115 bne quant_coeff_15_14 | |
| 116 tst r1, #0x20 | |
| 117 bne quant_coeff_13_11 | |
| 118 tst r1, #0x8 | |
| 119 bne quant_coeff_12_7 | |
| 120 tst r1, #0x40 | |
| 121 bne quant_coeff_10_9 | |
| 122 tst r1, #0x10 | |
| 123 bne quant_coeff_8_3 | |
| 124 tst r1, #0x2 | |
| 125 bne quant_coeff_6_5 | |
| 126 tst r1, #0x4 | |
| 127 bne quant_coeff_4_2 | |
| 128 b quant_coeff_1_0 | |
| 129 | |
| 130 quant_coeff_15_14 | |
| 131 ldrh r2, [r0, #30] ; rc=15, i=15 | |
| 132 mov lr, #16 | |
| 133 cmp r2, #0 | |
| 134 bne end | |
| 135 | |
| 136 ldrh r3, [r0, #28] ; rc=14, i=14 | |
| 137 mov lr, #15 | |
| 138 cmp r3, #0 | |
| 139 bne end | |
| 140 | |
| 141 quant_coeff_13_11 | |
| 142 ldrh r2, [r0, #22] ; rc=11, i=13 | |
| 143 mov lr, #14 | |
| 144 cmp r2, #0 | |
| 145 bne end | |
| 146 | |
| 147 quant_coeff_12_7 | |
| 148 ldrh r3, [r0, #14] ; rc=7, i=12 | |
| 149 mov lr, #13 | |
| 150 cmp r3, #0 | |
| 151 bne end | |
| 152 | |
| 153 ldrh r2, [r0, #20] ; rc=10, i=11 | |
| 154 mov lr, #12 | |
| 155 cmp r2, #0 | |
| 156 bne end | |
| 157 | |
| 158 quant_coeff_10_9 | |
| 159 ldrh r3, [r0, #26] ; rc=13, i=10 | |
| 160 mov lr, #11 | |
| 161 cmp r3, #0 | |
| 162 bne end | |
| 163 | |
| 164 ldrh r2, [r0, #24] ; rc=12, i=9 | |
| 165 mov lr, #10 | |
| 166 cmp r2, #0 | |
| 167 bne end | |
| 168 | |
| 169 quant_coeff_8_3 | |
| 170 ldrh r3, [r0, #18] ; rc=9, i=8 | |
| 171 mov lr, #9 | |
| 172 cmp r3, #0 | |
| 173 bne end | |
| 174 | |
| 175 ldrh r2, [r0, #12] ; rc=6, i=7 | |
| 176 mov lr, #8 | |
| 177 cmp r2, #0 | |
| 178 bne end | |
| 179 | |
| 180 quant_coeff_6_5 | |
| 181 ldrh r3, [r0, #6] ; rc=3, i=6 | |
| 182 mov lr, #7 | |
| 183 cmp r3, #0 | |
| 184 bne end | |
| 185 | |
| 186 ldrh r2, [r0, #4] ; rc=2, i=5 | |
| 187 mov lr, #6 | |
| 188 cmp r2, #0 | |
| 189 bne end | |
| 190 | |
| 191 quant_coeff_4_2 | |
| 192 ldrh r3, [r0, #10] ; rc=5, i=4 | |
| 193 mov lr, #5 | |
| 194 cmp r3, #0 | |
| 195 bne end | |
| 196 | |
| 197 ldrh r2, [r0, #16] ; rc=8, i=3 | |
| 198 mov lr, #4 | |
| 199 cmp r2, #0 | |
| 200 bne end | |
| 201 | |
| 202 ldrh r3, [r0, #8] ; rc=4, i=2 | |
| 203 mov lr, #3 | |
| 204 cmp r3, #0 | |
| 205 bne end | |
| 206 | |
| 207 quant_coeff_1_0 | |
| 208 ldrh r2, [r0, #2] ; rc=1, i=1 | |
| 209 mov lr, #2 | |
| 210 cmp r2, #0 | |
| 211 bne end | |
| 212 | |
| 213 mov lr, #1 ; rc=0, i=0 | |
| 214 | |
| 215 end | |
| 216 strb lr, [r12] | |
| 217 ldmfd sp!, {r1, r4-r11, pc} | |
| 218 | |
| 219 ENDP | |
| 220 | |
| 221 loop_count | |
| 222 DCD 0x1000000 | |
| 223 | |
| 224 END | |
| 225 | |
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Chromium Code Reviews
Issue 756673003:
libvpx: Pull from upstream (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/deps/third_party/libvpx/