89 строки
3.2 KiB
NASM
89 строки
3.2 KiB
NASM
;
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; Copyright (c) 2013 The WebM project authors. All Rights Reserved.
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;
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; Use of this source code is governed by a BSD-style license and patent
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; grant that can be found in the LICENSE file in the root of the source
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; tree. All contributing project authors may be found in the AUTHORS
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; file in the root of the source tree.
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;
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EXPORT |vpx_idct8x8_1_add_neon|
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ARM
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REQUIRE8
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PRESERVE8
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AREA ||.text||, CODE, READONLY, ALIGN=2
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;void vpx_idct8x8_1_add_neon(int16_t *input, uint8_t *dest,
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; int dest_stride)
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;
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; r0 int16_t input
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; r1 uint8_t *dest
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; r2 int dest_stride)
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|vpx_idct8x8_1_add_neon| PROC
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ldrsh r0, [r0]
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; generate cospi_16_64 = 11585
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mov r12, #0x2d00
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add r12, #0x41
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; out = dct_const_round_shift(input[0] * cospi_16_64)
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mul r0, r0, r12 ; input[0] * cospi_16_64
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add r0, r0, #0x2000 ; +(1 << ((DCT_CONST_BITS) - 1))
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asr r0, r0, #14 ; >> DCT_CONST_BITS
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; out = dct_const_round_shift(out * cospi_16_64)
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mul r0, r0, r12 ; out * cospi_16_64
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mov r12, r1 ; save dest
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add r0, r0, #0x2000 ; +(1 << ((DCT_CONST_BITS) - 1))
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asr r0, r0, #14 ; >> DCT_CONST_BITS
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; a1 = ROUND_POWER_OF_TWO(out, 5)
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add r0, r0, #16 ; + (1 <<((5) - 1))
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asr r0, r0, #5 ; >> 5
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vdup.s16 q0, r0 ; duplicate a1
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; load destination data
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vld1.64 {d2}, [r1], r2
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vld1.64 {d3}, [r1], r2
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vld1.64 {d4}, [r1], r2
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vld1.64 {d5}, [r1], r2
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vld1.64 {d6}, [r1], r2
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vld1.64 {d7}, [r1], r2
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vld1.64 {d16}, [r1], r2
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vld1.64 {d17}, [r1]
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vaddw.u8 q9, q0, d2 ; dest[x] + a1
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vaddw.u8 q10, q0, d3 ; dest[x] + a1
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vaddw.u8 q11, q0, d4 ; dest[x] + a1
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vaddw.u8 q12, q0, d5 ; dest[x] + a1
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vqmovun.s16 d2, q9 ; clip_pixel
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vqmovun.s16 d3, q10 ; clip_pixel
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vqmovun.s16 d30, q11 ; clip_pixel
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vqmovun.s16 d31, q12 ; clip_pixel
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vst1.64 {d2}, [r12], r2
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vst1.64 {d3}, [r12], r2
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vst1.64 {d30}, [r12], r2
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vst1.64 {d31}, [r12], r2
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vaddw.u8 q9, q0, d6 ; dest[x] + a1
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vaddw.u8 q10, q0, d7 ; dest[x] + a1
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vaddw.u8 q11, q0, d16 ; dest[x] + a1
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vaddw.u8 q12, q0, d17 ; dest[x] + a1
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vqmovun.s16 d2, q9 ; clip_pixel
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vqmovun.s16 d3, q10 ; clip_pixel
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vqmovun.s16 d30, q11 ; clip_pixel
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vqmovun.s16 d31, q12 ; clip_pixel
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vst1.64 {d2}, [r12], r2
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vst1.64 {d3}, [r12], r2
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vst1.64 {d30}, [r12], r2
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vst1.64 {d31}, [r12], r2
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bx lr
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ENDP ; |vpx_idct8x8_1_add_neon|
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END
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