libvpx: Pull from upstream

source/libvpx/vp9/common/arm/neon/vp9_iht4x4_add_neon.asm

-;
-;  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_iht4x4_16_add_neon|
-    ARM
-    REQUIRE8
-    PRESERVE8
-
-    AREA ||.text||, CODE, READONLY, ALIGN=2
-
-    ; Parallel 1D IDCT on all the columns of a 4x4 16bits data matrix which are
-    ; loaded in d16-d19. d0 must contain cospi_8_64. d1 must contain
-    ; cospi_16_64. d2 must contain cospi_24_64. The output will be stored back
-    ; into d16-d19 registers. This macro will touch q10- q15 registers and use
-    ; them as buffer during calculation.
-    MACRO
-    IDCT4x4_1D
-    ; stage 1
-    vadd.s16    d23, d16, d18   ; (input[0] + input[2])
-    vsub.s16    d24, d16, d18   ; (input[0] - input[2])
-
-    vmull.s16   q15, d17, d2    ; input[1] * cospi_24_64
-    vmull.s16   q10, d17, d0    ; input[1] * cospi_8_64
-    vmull.s16   q13, d23, d1    ; (input[0] + input[2]) * cospi_16_64
-    vmull.s16   q14, d24, d1    ; (input[0] - input[2]) * cospi_16_64
-    vmlsl.s16   q15, d19, d0    ; input[1] * cospi_24_64 - input[3] * cospi_8_64
-    vmlal.s16   q10, d19, d2    ; input[1] * cospi_8_64 + input[3] * cospi_24_64
-
-    ; dct_const_round_shift
-    vqrshrn.s32 d26, q13, #14
-    vqrshrn.s32 d27, q14, #14
-    vqrshrn.s32 d29, q15, #14
-    vqrshrn.s32 d28, q10, #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
-    MEND
-
-    ; Parallel 1D IADST on all the columns of a 4x4 16bits data matrix which
-    ; loaded in d16-d19. d3 must contain sinpi_1_9. d4 must contain sinpi_2_9.
-    ; d5 must contain sinpi_4_9. d6 must contain sinpi_3_9. The output will be
-    ; stored back into d16-d19 registers. This macro will touch q11,q12,q13,
-    ; q14,q15 registers and use them as buffer during calculation.
-    MACRO
-    IADST4x4_1D
-    vmull.s16   q10, d3, d16    ; s0 = sinpi_1_9 * x0
-    vmull.s16   q11, d4, d16    ; s1 = sinpi_2_9 * x0
-    vmull.s16   q12, d6, d17    ; s2 = sinpi_3_9 * x1
-    vmull.s16   q13, d5, d18    ; s3 = sinpi_4_9 * x2
-    vmull.s16   q14, d3, d18    ; s4 = sinpi_1_9 * x2
-    vmovl.s16   q15, d16        ; expand x0 from 16 bit to 32 bit
-    vaddw.s16   q15, q15, d19   ; x0 + x3
-    vmull.s16   q8, d4, d19     ; s5 = sinpi_2_9 * x3
-    vsubw.s16   q15, q15, d18   ; s7 = x0 + x3 - x2
-    vmull.s16   q9, d5, d19     ; s6 = sinpi_4_9 * x3
-
-    vadd.s32    q10, q10, q13   ; x0 = s0 + s3 + s5
-    vadd.s32    q10, q10, q8
-    vsub.s32    q11, q11, q14   ; x1 = s1 - s4 - s6
-    vdup.32     q8, r0          ; duplicate sinpi_3_9
-    vsub.s32    q11, q11, q9
-    vmul.s32    q15, q15, q8    ; x2 = sinpi_3_9 * s7
-
-    vadd.s32    q13, q10, q12   ; s0 = x0 + x3
-    vadd.s32    q10, q10, q11   ; x0 + x1
-    vadd.s32    q14, q11, q12   ; s1 = x1 + x3
-    vsub.s32    q10, q10, q12   ; s3 = x0 + x1 - x3
-
-    ; dct_const_round_shift
-    vqrshrn.s32 d16, q13, #14
-    vqrshrn.s32 d17, q14, #14
-    vqrshrn.s32 d18, q15, #14
-    vqrshrn.s32 d19, q10, #14
-    MEND
-
-    ; Generate cosine constants in d6 - d8 for the IDCT
-    MACRO
-    GENERATE_COSINE_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 = 0x187e
-    mov         r12, #0x1800
-    add         r12, #0x7e
-
-    ; generate constant vectors
-    vdup.16     d0, r0          ; duplicate cospi_8_64
-    vdup.16     d1, r3          ; duplicate cospi_16_64
-    vdup.16     d2, r12         ; duplicate cospi_24_64
-    MEND
-
-    ; Generate sine constants in d1 - d4 for the IADST.
-    MACRO
-    GENERATE_SINE_CONSTANTS
-    ; sinpi_1_9 = 5283 = 0x14A3
-    mov         r0, #0x1400
-    add         r0, #0xa3
-    ; sinpi_2_9 = 9929 = 0x26C9
-    mov         r3, #0x2600
-    add         r3, #0xc9
-    ; sinpi_4_9 = 15212 = 0x3B6C
-    mov         r12, #0x3b00
-    add         r12, #0x6c
-
-    ; generate constant vectors
-    vdup.16     d3, r0          ; duplicate sinpi_1_9
-
-    ; sinpi_3_9 = 13377 = 0x3441
-    mov         r0, #0x3400
-    add         r0, #0x41
-
-    vdup.16     d4, r3          ; duplicate sinpi_2_9
-    vdup.16     d5, r12         ; duplicate sinpi_4_9
-    vdup.16     q3, r0          ; duplicate sinpi_3_9
-    MEND
-
-    ; Transpose a 4x4 16bits data matrix. Datas are loaded in d16-d19.
-    MACRO
-    TRANSPOSE4X4
-    vtrn.16     d16, d17
-    vtrn.16     d18, d19
-    vtrn.32     q8, q9
-    MEND
-
-    AREA     Block, CODE, READONLY ; name this block of code
-;void vp9_iht4x4_16_add_neon(int16_t *input, uint8_t *dest,
-;                               int dest_stride, int tx_type)
-;
-; r0  int16_t input
-; r1  uint8_t *dest
-; r2  int dest_stride
-; r3  int tx_type)
-; This function will only handle tx_type of 1,2,3.
-|vp9_iht4x4_16_add_neon| PROC
-
-    ; load the inputs into d16-d19
-    vld1.s16    {q8,q9}, [r0]!
-
-    ; transpose the input data
-    TRANSPOSE4X4
-
-    ; decide the type of transform
-    cmp         r3, #2
-    beq         idct_iadst
-    cmp         r3, #3
-    beq         iadst_iadst
-
-iadst_idct
-    ; generate constants
-    GENERATE_COSINE_CONSTANTS
-    GENERATE_SINE_CONSTANTS
-
-    ; first transform rows
-    IDCT4x4_1D
-
-    ; transpose the matrix
-    TRANSPOSE4X4
-
-    ; then transform columns
-    IADST4x4_1D
-
-    b end_vp9_iht4x4_16_add_neon
-
-idct_iadst
-    ; generate constants
-    GENERATE_COSINE_CONSTANTS
-    GENERATE_SINE_CONSTANTS
-
-    ; first transform rows
-    IADST4x4_1D
-
-    ; transpose the matrix
-    TRANSPOSE4X4
-
-    ; then transform columns
-    IDCT4x4_1D
-
-    b end_vp9_iht4x4_16_add_neon
-
-iadst_iadst
-    ; generate constants
-    GENERATE_SINE_CONSTANTS
-
-    ; first transform rows
-    IADST4x4_1D
-
-    ; transpose the matrix
-    TRANSPOSE4X4
-
-    ; then transform columns
-    IADST4x4_1D
-
-end_vp9_iht4x4_16_add_neon
-    ; 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[0]}, [r1], r2
-    vld1.32     {d27[1]}, [r1]
-
-    ; 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[1]}, [r1], r2
-    vst1.32     {d27[0]}, [r1], r2
-    vst1.32     {d26[1]}, [r1], r2
-    vst1.32     {d26[0]}, [r1]  ; no post-increment
-    bx          lr
-    ENDP  ; |vp9_iht4x4_16_add_neon|
-
-    END