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Unified Diff: source/libvpx/vp9/common/arm/neon/vp9_idct4x4_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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Index: source/libvpx/vp9/common/arm/neon/vp9_idct4x4_add_neon.asm
===================================================================
--- source/libvpx/vp9/common/arm/neon/vp9_idct4x4_add_neon.asm (revision 293588)
+++ source/libvpx/vp9/common/arm/neon/vp9_idct4x4_add_neon.asm (working copy)
@@ -1,190 +0,0 @@
-;
-; Copyright (c) 2013 The WebM project authors. All Rights Reserved.
-;
-; Use of this source code is governed by a BSD-style license
-; that can be found in the LICENSE file in the root of the source
-; tree. An additional intellectual property rights grant can be found
-; in the file PATENTS. All contributing project authors may
-; be found in the AUTHORS file in the root of the source tree.
-;
-
- EXPORT |vp9_idct4x4_16_add_neon|
- ARM
- REQUIRE8
- PRESERVE8
-
- AREA ||.text||, CODE, READONLY, ALIGN=2
-
- AREA Block, CODE, READONLY ; name this block of code
-;void vp9_idct4x4_16_add_neon(int16_t *input, uint8_t *dest, int dest_stride)
-;
-; r0 int16_t input
-; r1 uint8_t *dest
-; r2 int dest_stride)
-
-|vp9_idct4x4_16_add_neon| PROC
-
- ; The 2D transform is done with two passes which are actually pretty
- ; similar. We first transform the rows. This is done by transposing
- ; the inputs, doing an SIMD column transform (the columns are the
- ; transposed rows) and then transpose the results (so that it goes back
- ; in normal/row positions). Then, we transform the columns by doing
- ; another SIMD column transform.
- ; So, two passes of a transpose followed by a column transform.
-
- ; load the inputs into q8-q9, d16-d19
- vld1.s16 {q8,q9}, [r0]!
-
- ; generate scalar constants
- ; cospi_8_64 = 15137 = 0x3b21
- mov r0, #0x3b00
- add r0, #0x21
- ; cospi_16_64 = 11585 = 0x2d41
- mov r3, #0x2d00
- add r3, #0x41
- ; cospi_24_64 = 6270 = 0x 187e
- mov r12, #0x1800
- add r12, #0x7e
-
- ; transpose the input data
- ; 00 01 02 03 d16
- ; 10 11 12 13 d17
- ; 20 21 22 23 d18
- ; 30 31 32 33 d19
- vtrn.16 d16, d17
- vtrn.16 d18, d19
-
- ; generate constant vectors
- vdup.16 d20, r0 ; replicate cospi_8_64
- vdup.16 d21, r3 ; replicate cospi_16_64
-
- ; 00 10 02 12 d16
- ; 01 11 03 13 d17
- ; 20 30 22 32 d18
- ; 21 31 23 33 d19
- vtrn.32 q8, q9
- ; 00 10 20 30 d16
- ; 01 11 21 31 d17
- ; 02 12 22 32 d18
- ; 03 13 23 33 d19
-
- vdup.16 d22, r12 ; replicate cospi_24_64
-
- ; do the transform on transposed rows
-
- ; stage 1
- vadd.s16 d23, d16, d18 ; (input[0] + input[2])
- vsub.s16 d24, d16, d18 ; (input[0] - input[2])
-
- vmull.s16 q15, d17, d22 ; input[1] * cospi_24_64
- vmull.s16 q1, d17, d20 ; input[1] * cospi_8_64
-
- ; (input[0] + input[2]) * cospi_16_64;
- ; (input[0] - input[2]) * cospi_16_64;
- vmull.s16 q13, d23, d21
- vmull.s16 q14, d24, d21
-
- ; input[1] * cospi_24_64 - input[3] * cospi_8_64;
- ; input[1] * cospi_8_64 + input[3] * cospi_24_64;
- vmlsl.s16 q15, d19, d20
- vmlal.s16 q1, d19, d22
-
- ; dct_const_round_shift
- vqrshrn.s32 d26, q13, #14
- vqrshrn.s32 d27, q14, #14
- vqrshrn.s32 d29, q15, #14
- vqrshrn.s32 d28, q1, #14
-
- ; stage 2
- ; output[0] = step[0] + step[3];
- ; output[1] = step[1] + step[2];
- ; output[3] = step[0] - step[3];
- ; output[2] = step[1] - step[2];
- vadd.s16 q8, q13, q14
- vsub.s16 q9, q13, q14
- vswp d18, d19
-
- ; transpose the results
- ; 00 01 02 03 d16
- ; 10 11 12 13 d17
- ; 20 21 22 23 d18
- ; 30 31 32 33 d19
- vtrn.16 d16, d17
- vtrn.16 d18, d19
- ; 00 10 02 12 d16
- ; 01 11 03 13 d17
- ; 20 30 22 32 d18
- ; 21 31 23 33 d19
- vtrn.32 q8, q9
- ; 00 10 20 30 d16
- ; 01 11 21 31 d17
- ; 02 12 22 32 d18
- ; 03 13 23 33 d19
-
- ; do the transform on columns
-
- ; stage 1
- vadd.s16 d23, d16, d18 ; (input[0] + input[2])
- vsub.s16 d24, d16, d18 ; (input[0] - input[2])
-
- vmull.s16 q15, d17, d22 ; input[1] * cospi_24_64
- vmull.s16 q1, d17, d20 ; input[1] * cospi_8_64
-
- ; (input[0] + input[2]) * cospi_16_64;
- ; (input[0] - input[2]) * cospi_16_64;
- vmull.s16 q13, d23, d21
- vmull.s16 q14, d24, d21
-
- ; input[1] * cospi_24_64 - input[3] * cospi_8_64;
- ; input[1] * cospi_8_64 + input[3] * cospi_24_64;
- vmlsl.s16 q15, d19, d20
- vmlal.s16 q1, d19, d22
-
- ; dct_const_round_shift
- vqrshrn.s32 d26, q13, #14
- vqrshrn.s32 d27, q14, #14
- vqrshrn.s32 d29, q15, #14
- vqrshrn.s32 d28, q1, #14
-
- ; stage 2
- ; output[0] = step[0] + step[3];
- ; output[1] = step[1] + step[2];
- ; output[3] = step[0] - step[3];
- ; output[2] = step[1] - step[2];
- vadd.s16 q8, q13, q14
- vsub.s16 q9, q13, q14
-
- ; The results are in two registers, one of them being swapped. This will
- ; be taken care of by loading the 'dest' value in a swapped fashion and
- ; also storing them in the same swapped fashion.
- ; temp_out[0, 1] = d16, d17 = q8
- ; temp_out[2, 3] = d19, d18 = q9 swapped
-
- ; ROUND_POWER_OF_TWO(temp_out[j], 4)
- vrshr.s16 q8, q8, #4
- vrshr.s16 q9, q9, #4
-
- vld1.32 {d26[0]}, [r1], r2
- vld1.32 {d26[1]}, [r1], r2
- vld1.32 {d27[1]}, [r1], r2
- vld1.32 {d27[0]}, [r1] ; no post-increment
-
- ; ROUND_POWER_OF_TWO(temp_out[j], 4) + dest[j * dest_stride + i]
- vaddw.u8 q8, q8, d26
- vaddw.u8 q9, q9, d27
-
- ; clip_pixel
- vqmovun.s16 d26, q8
- vqmovun.s16 d27, q9
-
- ; do the stores in reverse order with negative post-increment, by changing
- ; the sign of the stride
- rsb r2, r2, #0
- vst1.32 {d27[0]}, [r1], r2
- vst1.32 {d27[1]}, [r1], r2
- vst1.32 {d26[1]}, [r1], r2
- vst1.32 {d26[0]}, [r1] ; no post-increment
- bx lr
- ENDP ; |vp9_idct4x4_16_add_neon|
-
- END

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