81 lines
2.2 KiB
NASM
81 lines
2.2 KiB
NASM
;
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; Copyright (c) 2010 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
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; that can be found in the LICENSE file in the root of the source
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; tree. An additional intellectual property rights grant can be found
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; in the file PATENTS. All contributing project authors may
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; be found in the AUTHORS file in the root of the source tree.
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;
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EXPORT |vp8_short_inv_walsh4x4_neon|
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EXPORT |vp8_short_inv_walsh4x4_1_neon|
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ARM
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REQUIRE8
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PRESERVE8
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AREA |.text|, CODE, READONLY ; name this block of code
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;short vp8_short_inv_walsh4x4_neon(short *input, short *output)
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|vp8_short_inv_walsh4x4_neon| PROC
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; read in all four lines of values: d0->d3
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vld1.i16 {q0-q1}, [r0@128]
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; first for loop
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vadd.s16 d4, d0, d3 ;a = [0] + [12]
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vadd.s16 d6, d1, d2 ;b = [4] + [8]
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vsub.s16 d5, d0, d3 ;d = [0] - [12]
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vsub.s16 d7, d1, d2 ;c = [4] - [8]
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vadd.s16 q0, q2, q3 ; a+b d+c
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vsub.s16 q1, q2, q3 ; a-b d-c
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vtrn.32 d0, d2 ;d0: 0 1 8 9
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;d2: 2 3 10 11
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vtrn.32 d1, d3 ;d1: 4 5 12 13
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;d3: 6 7 14 15
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vtrn.16 d0, d1 ;d0: 0 4 8 12
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;d1: 1 5 9 13
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vtrn.16 d2, d3 ;d2: 2 6 10 14
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;d3: 3 7 11 15
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; second for loop
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vadd.s16 d4, d0, d3 ;a = [0] + [3]
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vadd.s16 d6, d1, d2 ;b = [1] + [2]
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vsub.s16 d5, d0, d3 ;d = [0] - [3]
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vsub.s16 d7, d1, d2 ;c = [1] - [2]
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vmov.i16 q8, #3
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vadd.s16 q0, q2, q3 ; a+b d+c
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vsub.s16 q1, q2, q3 ; a-b d-c
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vadd.i16 q0, q0, q8 ;e/f += 3
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vadd.i16 q1, q1, q8 ;g/h += 3
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vshr.s16 q0, q0, #3 ;e/f >> 3
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vshr.s16 q1, q1, #3 ;g/h >> 3
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vst4.i16 {d0,d1,d2,d3}, [r1@128]
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bx lr
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ENDP ; |vp8_short_inv_walsh4x4_neon|
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;short vp8_short_inv_walsh4x4_1_neon(short *input, short *output)
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|vp8_short_inv_walsh4x4_1_neon| PROC
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ldrsh r2, [r0] ; load input[0]
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add r3, r2, #3 ; add 3
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add r2, r1, #16 ; base for last 8 output
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asr r0, r3, #3 ; right shift 3
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vdup.16 q0, r0 ; load and duplicate
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vst1.16 {q0}, [r1@128] ; write back 8
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vst1.16 {q0}, [r2@128] ; write back last 8
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bx lr
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ENDP ; |vp8_short_inv_walsh4x4_1_neon|
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END
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