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 |vpx_idct4x4_1_add_neon| 12 ARM 13 REQUIRE8 14 PRESERVE8 15 16 AREA ||.text||, CODE, READONLY, ALIGN=2 17 18 ;void vpx_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 |vpx_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 ; |vpx_idct4x4_1_add_neon| 67 68 END 69
