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Side by Side Diff: source/libvpx/vp9/common/arm/neon/vp9_idct4x4_1_add_neon.asm

Issue 812033011: libvpx: Pull from upstream (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/deps/third_party/libvpx/
Patch Set: Created 5 years, 11 months ago
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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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