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| 1 ; |
| 2 ; Copyright (c) 2013 The WebM project authors. All Rights Reserved. |
| 3 ; |
| 4 ; Use of this source code is governed by a BSD-style license and patent |
| 5 ; grant that can be found in the LICENSE file in the root of the source |
| 6 ; tree. All contributing project authors may be found in the AUTHORS |
| 7 ; file in the root of the source tree. |
| 8 ; |
| 9 |
| 10 |
| 11 EXPORT |vp9_idct4x4_1_add_neon| |
| 12 ARM |
| 13 REQUIRE8 |
| 14 PRESERVE8 |
| 15 |
| 16 AREA ||.text||, CODE, READONLY, ALIGN=2 |
| 17 |
| 18 ;void vp9_idct4x4_1_add_neon(int16_t *input, uint8_t *dest, |
| 19 ; int dest_stride) |
| 20 ; |
| 21 ; r0 int16_t input |
| 22 ; r1 uint8_t *dest |
| 23 ; r2 int dest_stride) |
| 24 |
| 25 |vp9_idct4x4_1_add_neon| PROC |
| 26 ldrsh r0, [r0] |
| 27 |
| 28 ; generate cospi_16_64 = 11585 |
| 29 mov r12, #0x2d00 |
| 30 add r12, #0x41 |
| 31 |
| 32 ; out = dct_const_round_shift(input[0] * cospi_16_64) |
| 33 mul r0, r0, r12 ; input[0] * cospi_16_64 |
| 34 add r0, r0, #0x2000 ; +(1 << ((DCT_CONST_BITS) - 1)) |
| 35 asr r0, r0, #14 ; >> DCT_CONST_BITS |
| 36 |
| 37 ; out = dct_const_round_shift(out * cospi_16_64) |
| 38 mul r0, r0, r12 ; out * cospi_16_64 |
| 39 mov r12, r1 ; save dest |
| 40 add r0, r0, #0x2000 ; +(1 << ((DCT_CONST_BITS) - 1)) |
| 41 asr r0, r0, #14 ; >> DCT_CONST_BITS |
| 42 |
| 43 ; a1 = ROUND_POWER_OF_TWO(out, 4) |
| 44 add r0, r0, #8 ; + (1 <<((4) - 1)) |
| 45 asr r0, r0, #4 ; >> 4 |
| 46 |
| 47 vdup.s16 q0, r0 ; duplicate a1 |
| 48 |
| 49 vld1.32 {d2[0]}, [r1], r2 |
| 50 vld1.32 {d2[1]}, [r1], r2 |
| 51 vld1.32 {d4[0]}, [r1], r2 |
| 52 vld1.32 {d4[1]}, [r1] |
| 53 |
| 54 vaddw.u8 q8, q0, d2 ; dest[x] + a1 |
| 55 vaddw.u8 q9, q0, d4 |
| 56 |
| 57 vqmovun.s16 d6, q8 ; clip_pixel |
| 58 vqmovun.s16 d7, q9 |
| 59 |
| 60 vst1.32 {d6[0]}, [r12], r2 |
| 61 vst1.32 {d6[1]}, [r12], r2 |
| 62 vst1.32 {d7[0]}, [r12], r2 |
| 63 vst1.32 {d7[1]}, [r12] |
| 64 |
| 65 bx lr |
| 66 ENDP ; |vp9_idct4x4_1_add_neon| |
| 67 |
| 68 END |
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