/*
* ARMv7 NEON optimizations for libjpeg-turbo
*
* Copyright (C) 2009-2011 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* Author: Siarhei Siamashka <siarhei.siamashka@nokia.com>
* Copyright (C) 2014 Siarhei Siamashka. All Rights Reserved.
* Copyright (C) 2014 Linaro Limited. All Rights Reserved.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#if defined(__linux__) && defined(__ELF__)
.section .note.GNU-stack,"",%progbits /* mark stack as non-executable */
#endif
.text
.fpu neon
.arch armv7a
.object_arch armv4
.arm
#define RESPECT_STRICT_ALIGNMENT 1
/*****************************************************************************/
/* Supplementary macro for setting function attributes */
.macro asm_function fname
#ifdef __APPLE__
.globl _\fname
_\fname:
#else
.global \fname
#ifdef __ELF__
.hidden \fname
.type \fname, %function
#endif
\fname:
#endif
.endm
/* Transpose a block of 4x4 coefficients in four 64-bit registers */
.macro transpose_4x4 x0, x1, x2, x3
vtrn.16 \x0, \x1
vtrn.16 \x2, \x3
vtrn.32 \x0, \x2
vtrn.32 \x1, \x3
.endm
#define CENTERJSAMPLE 128
/*****************************************************************************/
/*
* Perform dequantization and inverse DCT on one block of coefficients.
*
* GLOBAL(void)
* jsimd_idct_islow_neon (void * dct_table, JCOEFPTR coef_block,
* JSAMPARRAY output_buf, JDIMENSION output_col)
*/
#define FIX_0_298631336 (2446)
#define FIX_0_390180644 (3196)
#define FIX_0_541196100 (4433)
#define FIX_0_765366865 (6270)
#define FIX_0_899976223 (7373)
#define FIX_1_175875602 (9633)
#define FIX_1_501321110 (12299)
#define FIX_1_847759065 (15137)
#define FIX_1_961570560 (16069)
#define FIX_2_053119869 (16819)
#define FIX_2_562915447 (20995)
#define FIX_3_072711026 (25172)
#define FIX_1_175875602_MINUS_1_961570560 (FIX_1_175875602 - FIX_1_961570560)
#define FIX_1_175875602_MINUS_0_390180644 (FIX_1_175875602 - FIX_0_390180644)
#define FIX_0_541196100_MINUS_1_847759065 (FIX_0_541196100 - FIX_1_847759065)
#define FIX_3_072711026_MINUS_2_562915447 (FIX_3_072711026 - FIX_2_562915447)
#define FIX_0_298631336_MINUS_0_899976223 (FIX_0_298631336 - FIX_0_899976223)
#define FIX_1_501321110_MINUS_0_899976223 (FIX_1_501321110 - FIX_0_899976223)
#define FIX_2_053119869_MINUS_2_562915447 (FIX_2_053119869 - FIX_2_562915447)
#define FIX_0_541196100_PLUS_0_765366865 (FIX_0_541196100 + FIX_0_765366865)
/*
* Reference SIMD-friendly 1-D ISLOW iDCT C implementation.
* Uses some ideas from the comments in 'simd/jiss2int-64.asm'
*/
#define REF_1D_IDCT(xrow0, xrow1, xrow2, xrow3, xrow4, xrow5, xrow6, xrow7) \
{ \
DCTELEM row0, row1, row2, row3, row4, row5, row6, row7; \
INT32 q1, q2, q3, q4, q5, q6, q7; \
INT32 tmp11_plus_tmp2, tmp11_minus_tmp2; \
\
/* 1-D iDCT input data */ \
row0 = xrow0; \
row1 = xrow1; \
row2 = xrow2; \
row3 = xrow3; \
row4 = xrow4; \
row5 = xrow5; \
row6 = xrow6; \
row7 = xrow7; \
\
q5 = row7 + row3; \
q4 = row5 + row1; \
q6 = MULTIPLY(q5, FIX_1_175875602_MINUS_1_961570560) + \
MULTIPLY(q4, FIX_1_175875602); \
q7 = MULTIPLY(q5, FIX_1_175875602) + \
MULTIPLY(q4, FIX_1_175875602_MINUS_0_390180644); \
q2 = MULTIPLY(row2, FIX_0_541196100) + \
MULTIPLY(row6, FIX_0_541196100_MINUS_1_847759065); \
q4 = q6; \
q3 = ((INT32) row0 - (INT32) row4) << 13; \
q6 += MULTIPLY(row5, -FIX_2_562915447) + \
MULTIPLY(row3, FIX_3_072711026_MINUS_2_562915447); \
/* now we can use q1 (reloadable constants have been used up) */ \
q1 = q3 + q2; \
q4 += MULTIPLY(row7, FIX_0_298631336_MINUS_0_899976223) + \
MULTIPLY(row1, -FIX_0_899976223); \
q5 = q7; \
q1 = q1 + q6; \
q7 += MULTIPLY(row7, -FIX_0_899976223) + \
MULTIPLY(row1, FIX_1_501321110_MINUS_0_899976223); \
\
/* (tmp11 + tmp2) has been calculated (out_row1 before descale) */ \
tmp11_plus_tmp2 = q1; \
row1 = 0; \
\
q1 = q1 - q6; \
q5 += MULTIPLY(row5, FIX_2_053119869_MINUS_2_562915447) + \
MULTIPLY(row3, -FIX_2_562915447); \
q1 = q1 - q6; \
q6 = MULTIPLY(row2, FIX_0_541196100_PLUS_0_765366865) + \
MULTIPLY(row6, FIX_0_541196100); \
q3 = q3 - q2; \
\
/* (tmp11 - tmp2) has been calculated (out_row6 before descale) */ \
tmp11_minus_tmp2 = q1; \
\
q1 = ((INT32) row0 + (INT32) row4) << 13; \
q2 = q1 + q6; \
q1 = q1 - q6; \
\
/* pick up the results */ \
tmp0 = q4; \
tmp1 = q5; \
tmp2 = (tmp11_plus_tmp2 - tmp11_minus_tmp2) / 2; \
tmp3 = q7; \
tmp10 = q2; \
tmp11 = (tmp11_plus_tmp2 + tmp11_minus_tmp2) / 2; \
tmp12 = q3; \
tmp13 = q1; \
}
#define XFIX_0_899976223 d0[0]
#define XFIX_0_541196100 d0[1]
#define XFIX_2_562915447 d0[2]
#define XFIX_0_298631336_MINUS_0_899976223 d0[3]
#define XFIX_1_501321110_MINUS_0_899976223 d1[0]
#define XFIX_2_053119869_MINUS_2_562915447 d1[1]
#define XFIX_0_541196100_PLUS_0_765366865 d1[2]
#define XFIX_1_175875602 d1[3]
#define XFIX_1_175875602_MINUS_0_390180644 d2[0]
#define XFIX_0_541196100_MINUS_1_847759065 d2[1]
#define XFIX_3_072711026_MINUS_2_562915447 d2[2]
#define XFIX_1_175875602_MINUS_1_961570560 d2[3]
.balign 16
jsimd_idct_islow_neon_consts:
.short FIX_0_899976223 /* d0[0] */
.short FIX_0_541196100 /* d0[1] */
.short FIX_2_562915447 /* d0[2] */
.short FIX_0_298631336_MINUS_0_899976223 /* d0[3] */
.short FIX_1_501321110_MINUS_0_899976223 /* d1[0] */
.short FIX_2_053119869_MINUS_2_562915447 /* d1[1] */
.short FIX_0_541196100_PLUS_0_765366865 /* d1[2] */
.short FIX_1_175875602 /* d1[3] */
/* reloadable constants */
.short FIX_1_175875602_MINUS_0_390180644 /* d2[0] */
.short FIX_0_541196100_MINUS_1_847759065 /* d2[1] */
.short FIX_3_072711026_MINUS_2_562915447 /* d2[2] */
.short FIX_1_175875602_MINUS_1_961570560 /* d2[3] */
asm_function jsimd_idct_islow_neon
DCT_TABLE .req r0
COEF_BLOCK .req r1
OUTPUT_BUF .req r2
OUTPUT_COL .req r3
TMP1 .req r0
TMP2 .req r1
TMP3 .req r2
TMP4 .req ip
ROW0L .req d16
ROW0R .req d17
ROW1L .req d18
ROW1R .req d19
ROW2L .req d20
ROW2R .req d21
ROW3L .req d22
ROW3R .req d23
ROW4L .req d24
ROW4R .req d25
ROW5L .req d26
ROW5R .req d27
ROW6L .req d28
ROW6R .req d29
ROW7L .req d30
ROW7R .req d31
/* Load and dequantize coefficients into NEON registers
* with the following allocation:
* 0 1 2 3 | 4 5 6 7
* ---------+--------
* 0 | d16 | d17 ( q8 )
* 1 | d18 | d19 ( q9 )
* 2 | d20 | d21 ( q10 )
* 3 | d22 | d23 ( q11 )
* 4 | d24 | d25 ( q12 )
* 5 | d26 | d27 ( q13 )
* 6 | d28 | d29 ( q14 )
* 7 | d30 | d31 ( q15 )
*/
adr ip, jsimd_idct_islow_neon_consts
vld1.16 {d16, d17, d18, d19}, [COEF_BLOCK, :128]!
vld1.16 {d0, d1, d2, d3}, [DCT_TABLE, :128]!
vld1.16 {d20, d21, d22, d23}, [COEF_BLOCK, :128]!
vmul.s16 q8, q8, q0
vld1.16 {d4, d5, d6, d7}, [DCT_TABLE, :128]!
vmul.s16 q9, q9, q1
vld1.16 {d24, d25, d26, d27}, [COEF_BLOCK, :128]!
vmul.s16 q10, q10, q2
vld1.16 {d0, d1, d2, d3}, [DCT_TABLE, :128]!
vmul.s16 q11, q11, q3
vld1.16 {d28, d29, d30, d31}, [COEF_BLOCK, :128]
vmul.s16 q12, q12, q0
vld1.16 {d4, d5, d6, d7}, [DCT_TABLE, :128]!
vmul.s16 q14, q14, q2
vmul.s16 q13, q13, q1
vld1.16 {d0, d1, d2, d3}, [ip, :128] /* load constants */
add ip, ip, #16
vmul.s16 q15, q15, q3
vpush {d8-d15} /* save NEON registers */
/* 1-D IDCT, pass 1, left 4x8 half */
vadd.s16 d4, ROW7L, ROW3L
vadd.s16 d5, ROW5L, ROW1L
vmull.s16 q6, d4, XFIX_1_175875602_MINUS_1_961570560
vmlal.s16 q6, d5, XFIX_1_175875602
vmull.s16 q7, d4, XFIX_1_175875602
/* Check for the zero coefficients in the right 4x8 half */
push {r4, r5}
vmlal.s16 q7, d5, XFIX_1_175875602_MINUS_0_390180644
vsubl.s16 q3, ROW0L, ROW4L
ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 1 * 8))]
vmull.s16 q2, ROW2L, XFIX_0_541196100
vmlal.s16 q2, ROW6L, XFIX_0_541196100_MINUS_1_847759065
orr r0, r4, r5
vmov q4, q6
vmlsl.s16 q6, ROW5L, XFIX_2_562915447
ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 2 * 8))]
vmlal.s16 q6, ROW3L, XFIX_3_072711026_MINUS_2_562915447
vshl.s32 q3, q3, #13
orr r0, r0, r4
vmlsl.s16 q4, ROW1L, XFIX_0_899976223
orr r0, r0, r5
vadd.s32 q1, q3, q2
ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 3 * 8))]
vmov q5, q7
vadd.s32 q1, q1, q6
orr r0, r0, r4
vmlsl.s16 q7, ROW7L, XFIX_0_899976223
orr r0, r0, r5
vmlal.s16 q7, ROW1L, XFIX_1_501321110_MINUS_0_899976223
vrshrn.s32 ROW1L, q1, #11
ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 4 * 8))]
vsub.s32 q1, q1, q6
vmlal.s16 q5, ROW5L, XFIX_2_053119869_MINUS_2_562915447
orr r0, r0, r4
vmlsl.s16 q5, ROW3L, XFIX_2_562915447
orr r0, r0, r5
vsub.s32 q1, q1, q6
vmull.s16 q6, ROW2L, XFIX_0_541196100_PLUS_0_765366865
ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 5 * 8))]
vmlal.s16 q6, ROW6L, XFIX_0_541196100
vsub.s32 q3, q3, q2
orr r0, r0, r4
vrshrn.s32 ROW6L, q1, #11
orr r0, r0, r5
vadd.s32 q1, q3, q5
ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 6 * 8))]
vsub.s32 q3, q3, q5
vaddl.s16 q5, ROW0L, ROW4L
orr r0, r0, r4
vrshrn.s32 ROW2L, q1, #11
orr r0, r0, r5
vrshrn.s32 ROW5L, q3, #11
ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 7 * 8))]
vshl.s32 q5, q5, #13
vmlal.s16 q4, ROW7L, XFIX_0_298631336_MINUS_0_899976223
orr r0, r0, r4
vadd.s32 q2, q5, q6
orrs r0, r0, r5
vsub.s32 q1, q5, q6
vadd.s32 q6, q2, q7
ldrd r4, [COEF_BLOCK, #(-96 + 2 * (4 + 0 * 8))]
vsub.s32 q2, q2, q7
vadd.s32 q5, q1, q4
orr r0, r4, r5
vsub.s32 q3, q1, q4
pop {r4, r5}
vrshrn.s32 ROW7L, q2, #11
vrshrn.s32 ROW3L, q5, #11
vrshrn.s32 ROW0L, q6, #11
vrshrn.s32 ROW4L, q3, #11
beq 3f /* Go to do some special handling for the sparse right 4x8 half */
/* 1-D IDCT, pass 1, right 4x8 half */
vld1.s16 {d2}, [ip, :64] /* reload constants */
vadd.s16 d10, ROW7R, ROW3R
vadd.s16 d8, ROW5R, ROW1R
/* Transpose left 4x8 half */
vtrn.16 ROW6L, ROW7L
vmull.s16 q6, d10, XFIX_1_175875602_MINUS_1_961570560
vmlal.s16 q6, d8, XFIX_1_175875602
vtrn.16 ROW2L, ROW3L
vmull.s16 q7, d10, XFIX_1_175875602
vmlal.s16 q7, d8, XFIX_1_175875602_MINUS_0_390180644
vtrn.16 ROW0L, ROW1L
vsubl.s16 q3, ROW0R, ROW4R
vmull.s16 q2, ROW2R, XFIX_0_541196100
vmlal.s16 q2, ROW6R, XFIX_0_541196100_MINUS_1_847759065
vtrn.16 ROW4L, ROW5L
vmov q4, q6
vmlsl.s16 q6, ROW5R, XFIX_2_562915447
vmlal.s16 q6, ROW3R, XFIX_3_072711026_MINUS_2_562915447
vtrn.32 ROW1L, ROW3L
vshl.s32 q3, q3, #13
vmlsl.s16 q4, ROW1R, XFIX_0_899976223
vtrn.32 ROW4L, ROW6L
vadd.s32 q1, q3, q2
vmov q5, q7
vadd.s32 q1, q1, q6
vtrn.32 ROW0L, ROW2L
vmlsl.s16 q7, ROW7R, XFIX_0_899976223
vmlal.s16 q7, ROW1R, XFIX_1_501321110_MINUS_0_899976223
vrshrn.s32 ROW1R, q1, #11
vtrn.32 ROW5L, ROW7L
vsub.s32 q1, q1, q6
vmlal.s16 q5, ROW5R, XFIX_2_053119869_MINUS_2_562915447
vmlsl.s16 q5, ROW3R, XFIX_2_562915447
vsub.s32 q1, q1, q6
vmull.s16 q6, ROW2R, XFIX_0_541196100_PLUS_0_765366865
vmlal.s16 q6, ROW6R, XFIX_0_541196100
vsub.s32 q3, q3, q2
vrshrn.s32 ROW6R, q1, #11
vadd.s32 q1, q3, q5
vsub.s32 q3, q3, q5
vaddl.s16 q5, ROW0R, ROW4R
vrshrn.s32 ROW2R, q1, #11
vrshrn.s32 ROW5R, q3, #11
vshl.s32 q5, q5, #13
vmlal.s16 q4, ROW7R, XFIX_0_298631336_MINUS_0_899976223
vadd.s32 q2, q5, q6
vsub.s32 q1, q5, q6
vadd.s32 q6, q2, q7
vsub.s32 q2, q2, q7
vadd.s32 q5, q1, q4
vsub.s32 q3, q1, q4
vrshrn.s32 ROW7R, q2, #11
vrshrn.s32 ROW3R, q5, #11
vrshrn.s32 ROW0R, q6, #11
vrshrn.s32 ROW4R, q3, #11
/* Transpose right 4x8 half */
vtrn.16 ROW6R, ROW7R
vtrn.16 ROW2R, ROW3R
vtrn.16 ROW0R, ROW1R
vtrn.16 ROW4R, ROW5R
vtrn.32 ROW1R, ROW3R
vtrn.32 ROW4R, ROW6R
vtrn.32 ROW0R, ROW2R
vtrn.32 ROW5R, ROW7R
1: /* 1-D IDCT, pass 2 (normal variant), left 4x8 half */
vld1.s16 {d2}, [ip, :64] /* reload constants */
vmull.s16 q6, ROW1R, XFIX_1_175875602 /* ROW5L <-> ROW1R */
vmlal.s16 q6, ROW1L, XFIX_1_175875602
vmlal.s16 q6, ROW3R, XFIX_1_175875602_MINUS_1_961570560 /* ROW7L <-> ROW3R */
vmlal.s16 q6, ROW3L, XFIX_1_175875602_MINUS_1_961570560
vmull.s16 q7, ROW3R, XFIX_1_175875602 /* ROW7L <-> ROW3R */
vmlal.s16 q7, ROW3L, XFIX_1_175875602
vmlal.s16 q7, ROW1R, XFIX_1_175875602_MINUS_0_390180644 /* ROW5L <-> ROW1R */
vmlal.s16 q7, ROW1L, XFIX_1_175875602_MINUS_0_390180644
vsubl.s16 q3, ROW0L, ROW0R /* ROW4L <-> ROW0R */
vmull.s16 q2, ROW2L, XFIX_0_541196100
vmlal.s16 q2, ROW2R, XFIX_0_541196100_MINUS_1_847759065 /* ROW6L <-> ROW2R */
vmov q4, q6
vmlsl.s16 q6, ROW1R, XFIX_2_562915447 /* ROW5L <-> ROW1R */
vmlal.s16 q6, ROW3L, XFIX_3_072711026_MINUS_2_562915447
vshl.s32 q3, q3, #13
vmlsl.s16 q4, ROW1L, XFIX_0_899976223
vadd.s32 q1, q3, q2
vmov q5, q7
vadd.s32 q1, q1, q6
vmlsl.s16 q7, ROW3R, XFIX_0_899976223 /* ROW7L <-> ROW3R */
vmlal.s16 q7, ROW1L, XFIX_1_501321110_MINUS_0_899976223
vshrn.s32 ROW1L, q1, #16
vsub.s32 q1, q1, q6
vmlal.s16 q5, ROW1R, XFIX_2_053119869_MINUS_2_562915447 /* ROW5L <-> ROW1R */
vmlsl.s16 q5, ROW3L, XFIX_2_562915447
vsub.s32 q1, q1, q6
vmull.s16 q6, ROW2L, XFIX_0_541196100_PLUS_0_765366865
vmlal.s16 q6, ROW2R, XFIX_0_541196100 /* ROW6L <-> ROW2R */
vsub.s32 q3, q3, q2
vshrn.s32 ROW2R, q1, #16 /* ROW6L <-> ROW2R */
vadd.s32 q1, q3, q5
vsub.s32 q3, q3, q5
vaddl.s16 q5, ROW0L, ROW0R /* ROW4L <-> ROW0R */
vshrn.s32 ROW2L, q1, #16
vshrn.s32 ROW1R, q3, #16 /* ROW5L <-> ROW1R */
vshl.s32 q5, q5, #13
vmlal.s16 q4, ROW3R, XFIX_0_298631336_MINUS_0_899976223 /* ROW7L <-> ROW3R */
vadd.s32 q2, q5, q6
vsub.s32 q1, q5, q6
vadd.s32 q6, q2, q7
vsub.s32 q2, q2, q7
vadd.s32 q5, q1, q4
vsub.s32 q3, q1, q4
vshrn.s32 ROW3R, q2, #16 /* ROW7L <-> ROW3R */
vshrn.s32 ROW3L, q5, #16
vshrn.s32 ROW0L, q6, #16
vshrn.s32 ROW0R, q3, #16 /* ROW4L <-> ROW0R */
/* 1-D IDCT, pass 2, right 4x8 half */
vld1.s16 {d2}, [ip, :64] /* reload constants */
vmull.s16 q6, ROW5R, XFIX_1_175875602
vmlal.s16 q6, ROW5L, XFIX_1_175875602 /* ROW5L <-> ROW1R */
vmlal.s16 q6, ROW7R, XFIX_1_175875602_MINUS_1_961570560
vmlal.s16 q6, ROW7L, XFIX_1_175875602_MINUS_1_961570560 /* ROW7L <-> ROW3R */
vmull.s16 q7, ROW7R, XFIX_1_175875602
vmlal.s16 q7, ROW7L, XFIX_1_175875602 /* ROW7L <-> ROW3R */
vmlal.s16 q7, ROW5R, XFIX_1_175875602_MINUS_0_390180644
vmlal.s16 q7, ROW5L, XFIX_1_175875602_MINUS_0_390180644 /* ROW5L <-> ROW1R */
vsubl.s16 q3, ROW4L, ROW4R /* ROW4L <-> ROW0R */
vmull.s16 q2, ROW6L, XFIX_0_541196100 /* ROW6L <-> ROW2R */
vmlal.s16 q2, ROW6R, XFIX_0_541196100_MINUS_1_847759065
vmov q4, q6
vmlsl.s16 q6, ROW5R, XFIX_2_562915447
vmlal.s16 q6, ROW7L, XFIX_3_072711026_MINUS_2_562915447 /* ROW7L <-> ROW3R */
vshl.s32 q3, q3, #13
vmlsl.s16 q4, ROW5L, XFIX_0_899976223 /* ROW5L <-> ROW1R */
vadd.s32 q1, q3, q2
vmov q5, q7
vadd.s32 q1, q1, q6
vmlsl.s16 q7, ROW7R, XFIX_0_899976223
vmlal.s16 q7, ROW5L, XFIX_1_501321110_MINUS_0_899976223 /* ROW5L <-> ROW1R */
vshrn.s32 ROW5L, q1, #16 /* ROW5L <-> ROW1R */
vsub.s32 q1, q1, q6
vmlal.s16 q5, ROW5R, XFIX_2_053119869_MINUS_2_562915447
vmlsl.s16 q5, ROW7L, XFIX_2_562915447 /* ROW7L <-> ROW3R */
vsub.s32 q1, q1, q6
vmull.s16 q6, ROW6L, XFIX_0_541196100_PLUS_0_765366865 /* ROW6L <-> ROW2R */
vmlal.s16 q6, ROW6R, XFIX_0_541196100
vsub.s32 q3, q3, q2
vshrn.s32 ROW6R, q1, #16
vadd.s32 q1, q3, q5
vsub.s32 q3, q3, q5
vaddl.s16 q5, ROW4L, ROW4R /* ROW4L <-> ROW0R */
vshrn.s32 ROW6L, q1, #16 /* ROW6L <-> ROW2R */
vshrn.s32 ROW5R, q3, #16
vshl.s32 q5, q5, #13
vmlal.s16 q4, ROW7R, XFIX_0_298631336_MINUS_0_899976223
vadd.s32 q2, q5, q6
vsub.s32 q1, q5, q6
vadd.s32 q6, q2, q7
vsub.s32 q2, q2, q7
vadd.s32 q5, q1, q4
vsub.s32 q3, q1, q4
vshrn.s32 ROW7R, q2, #16
vshrn.s32 ROW7L, q5, #16 /* ROW7L <-> ROW3R */
vshrn.s32 ROW4L, q6, #16 /* ROW4L <-> ROW0R */
vshrn.s32 ROW4R, q3, #16
2: /* Descale to 8-bit and range limit */
vqrshrn.s16 d16, q8, #2
vqrshrn.s16 d17, q9, #2
vqrshrn.s16 d18, q10, #2
vqrshrn.s16 d19, q11, #2
vpop {d8-d15} /* restore NEON registers */
vqrshrn.s16 d20, q12, #2
/* Transpose the final 8-bit samples and do signed->unsigned conversion */
vtrn.16 q8, q9
vqrshrn.s16 d21, q13, #2
vqrshrn.s16 d22, q14, #2
vmov.u8 q0, #(CENTERJSAMPLE)
vqrshrn.s16 d23, q15, #2
vtrn.8 d16, d17
vtrn.8 d18, d19
vadd.u8 q8, q8, q0
vadd.u8 q9, q9, q0
vtrn.16 q10, q11
/* Store results to the output buffer */
ldmia OUTPUT_BUF!, {TMP1, TMP2}
add TMP1, TMP1, OUTPUT_COL
add TMP2, TMP2, OUTPUT_COL
vst1.8 {d16}, [TMP1]
vtrn.8 d20, d21
vst1.8 {d17}, [TMP2]
ldmia OUTPUT_BUF!, {TMP1, TMP2}
add TMP1, TMP1, OUTPUT_COL
add TMP2, TMP2, OUTPUT_COL
vst1.8 {d18}, [TMP1]
vadd.u8 q10, q10, q0
vst1.8 {d19}, [TMP2]
ldmia OUTPUT_BUF, {TMP1, TMP2, TMP3, TMP4}
add TMP1, TMP1, OUTPUT_COL
add TMP2, TMP2, OUTPUT_COL
add TMP3, TMP3, OUTPUT_COL
add TMP4, TMP4, OUTPUT_COL
vtrn.8 d22, d23
vst1.8 {d20}, [TMP1]
vadd.u8 q11, q11, q0
vst1.8 {d21}, [TMP2]
vst1.8 {d22}, [TMP3]
vst1.8 {d23}, [TMP4]
bx lr
3: /* Left 4x8 half is done, right 4x8 half contains mostly zeros */
/* Transpose left 4x8 half */
vtrn.16 ROW6L, ROW7L
vtrn.16 ROW2L, ROW3L
vtrn.16 ROW0L, ROW1L
vtrn.16 ROW4L, ROW5L
vshl.s16 ROW0R, ROW0R, #2 /* PASS1_BITS */
vtrn.32 ROW1L, ROW3L
vtrn.32 ROW4L, ROW6L
vtrn.32 ROW0L, ROW2L
vtrn.32 ROW5L, ROW7L
cmp r0, #0
beq 4f /* Right 4x8 half has all zeros, go to 'sparse' second pass */
/* Only row 0 is non-zero for the right 4x8 half */
vdup.s16 ROW1R, ROW0R[1]
vdup.s16 ROW2R, ROW0R[2]
vdup.s16 ROW3R, ROW0R[3]
vdup.s16 ROW4R, ROW0R[0]
vdup.s16 ROW5R, ROW0R[1]
vdup.s16 ROW6R, ROW0R[2]
vdup.s16 ROW7R, ROW0R[3]
vdup.s16 ROW0R, ROW0R[0]
b 1b /* Go to 'normal' second pass */
4: /* 1-D IDCT, pass 2 (sparse variant with zero rows 4-7), left 4x8 half */
vld1.s16 {d2}, [ip, :64] /* reload constants */
vmull.s16 q6, ROW1L, XFIX_1_175875602
vmlal.s16 q6, ROW3L, XFIX_1_175875602_MINUS_1_961570560
vmull.s16 q7, ROW3L, XFIX_1_175875602
vmlal.s16 q7, ROW1L, XFIX_1_175875602_MINUS_0_390180644
vmull.s16 q2, ROW2L, XFIX_0_541196100
vshll.s16 q3, ROW0L, #13
vmov q4, q6
vmlal.s16 q6, ROW3L, XFIX_3_072711026_MINUS_2_562915447
vmlsl.s16 q4, ROW1L, XFIX_0_899976223
vadd.s32 q1, q3, q2
vmov q5, q7
vmlal.s16 q7, ROW1L, XFIX_1_501321110_MINUS_0_899976223
vadd.s32 q1, q1, q6
vadd.s32 q6, q6, q6
vmlsl.s16 q5, ROW3L, XFIX_2_562915447
vshrn.s32 ROW1L, q1, #16
vsub.s32 q1, q1, q6
vmull.s16 q6, ROW2L, XFIX_0_541196100_PLUS_0_765366865
vsub.s32 q3, q3, q2
vshrn.s32 ROW2R, q1, #16 /* ROW6L <-> ROW2R */
vadd.s32 q1, q3, q5
vsub.s32 q3, q3, q5
vshll.s16 q5, ROW0L, #13
vshrn.s32 ROW2L, q1, #16
vshrn.s32 ROW1R, q3, #16 /* ROW5L <-> ROW1R */
vadd.s32 q2, q5, q6
vsub.s32 q1, q5, q6
vadd.s32 q6, q2, q7
vsub.s32 q2, q2, q7
vadd.s32 q5, q1, q4
vsub.s32 q3, q1, q4
vshrn.s32 ROW3R, q2, #16 /* ROW7L <-> ROW3R */
vshrn.s32 ROW3L, q5, #16
vshrn.s32 ROW0L, q6, #16
vshrn.s32 ROW0R, q3, #16 /* ROW4L <-> ROW0R */
/* 1-D IDCT, pass 2 (sparse variant with zero rows 4-7), right 4x8 half */
vld1.s16 {d2}, [ip, :64] /* reload constants */
vmull.s16 q6, ROW5L, XFIX_1_175875602
vmlal.s16 q6, ROW7L, XFIX_1_175875602_MINUS_1_961570560
vmull.s16 q7, ROW7L, XFIX_1_175875602
vmlal.s16 q7, ROW5L, XFIX_1_175875602_MINUS_0_390180644
vmull.s16 q2, ROW6L, XFIX_0_541196100
vshll.s16 q3, ROW4L, #13
vmov q4, q6
vmlal.s16 q6, ROW7L, XFIX_3_072711026_MINUS_2_562915447
vmlsl.s16 q4, ROW5L, XFIX_0_899976223
vadd.s32 q1, q3, q2
vmov q5, q7
vmlal.s16 q7, ROW5L, XFIX_1_501321110_MINUS_0_899976223
vadd.s32 q1, q1, q6
vadd.s32 q6, q6, q6
vmlsl.s16 q5, ROW7L, XFIX_2_562915447
vshrn.s32 ROW5L, q1, #16 /* ROW5L <-> ROW1R */
vsub.s32 q1, q1, q6
vmull.s16 q6, ROW6L, XFIX_0_541196100_PLUS_0_765366865
vsub.s32 q3, q3, q2
vshrn.s32 ROW6R, q1, #16
vadd.s32 q1, q3, q5
vsub.s32 q3, q3, q5
vshll.s16 q5, ROW4L, #13
vshrn.s32 ROW6L, q1, #16 /* ROW6L <-> ROW2R */
vshrn.s32 ROW5R, q3, #16
vadd.s32 q2, q5, q6
vsub.s32 q1, q5, q6
vadd.s32 q6, q2, q7
vsub.s32 q2, q2, q7
vadd.s32 q5, q1, q4
vsub.s32 q3, q1, q4
vshrn.s32 ROW7R, q2, #16
vshrn.s32 ROW7L, q5, #16 /* ROW7L <-> ROW3R */
vshrn.s32 ROW4L, q6, #16 /* ROW4L <-> ROW0R */
vshrn.s32 ROW4R, q3, #16
b 2b /* Go to epilogue */
.unreq DCT_TABLE
.unreq COEF_BLOCK
.unreq OUTPUT_BUF
.unreq OUTPUT_COL
.unreq TMP1
.unreq TMP2
.unreq TMP3
.unreq TMP4
.unreq ROW0L
.unreq ROW0R
.unreq ROW1L
.unreq ROW1R
.unreq ROW2L
.unreq ROW2R
.unreq ROW3L
.unreq ROW3R
.unreq ROW4L
.unreq ROW4R
.unreq ROW5L
.unreq ROW5R
.unreq ROW6L
.unreq ROW6R
.unreq ROW7L
.unreq ROW7R
/*****************************************************************************/
/*
* jsimd_idct_ifast_neon
*
* This function contains a fast, not so accurate integer implementation of
* the inverse DCT (Discrete Cosine Transform). It uses the same calculations
* and produces exactly the same output as IJG's original 'jpeg_idct_ifast'
* function from jidctfst.c
*
* Normally 1-D AAN DCT needs 5 multiplications and 29 additions.
* But in ARM NEON case some extra additions are required because VQDMULH
* instruction can't handle the constants larger than 1. So the expressions
* like "x * 1.082392200" have to be converted to "x * 0.082392200 + x",
* which introduces an extra addition. Overall, there are 6 extra additions
* per 1-D IDCT pass, totalling to 5 VQDMULH and 35 VADD/VSUB instructions.
*/
#define XFIX_1_082392200 d0[0]
#define XFIX_1_414213562 d0[1]
#define XFIX_1_847759065 d0[2]
#define XFIX_2_613125930 d0[3]
.balign 16
jsimd_idct_ifast_neon_consts:
.short (277 * 128 - 256 * 128) /* XFIX_1_082392200 */
.short (362 * 128 - 256 * 128) /* XFIX_1_414213562 */
.short (473 * 128 - 256 * 128) /* XFIX_1_847759065 */
.short (669 * 128 - 512 * 128) /* XFIX_2_613125930 */
asm_function jsimd_idct_ifast_neon
DCT_TABLE .req r0
COEF_BLOCK .req r1
OUTPUT_BUF .req r2
OUTPUT_COL .req r3
TMP1 .req r0
TMP2 .req r1
TMP3 .req r2
TMP4 .req ip
/* Load and dequantize coefficients into NEON registers
* with the following allocation:
* 0 1 2 3 | 4 5 6 7
* ---------+--------
* 0 | d16 | d17 ( q8 )
* 1 | d18 | d19 ( q9 )
* 2 | d20 | d21 ( q10 )
* 3 | d22 | d23 ( q11 )
* 4 | d24 | d25 ( q12 )
* 5 | d26 | d27 ( q13 )
* 6 | d28 | d29 ( q14 )
* 7 | d30 | d31 ( q15 )
*/
adr ip, jsimd_idct_ifast_neon_consts
vld1.16 {d16, d17, d18, d19}, [COEF_BLOCK, :128]!
vld1.16 {d0, d1, d2, d3}, [DCT_TABLE, :128]!
vld1.16 {d20, d21, d22, d23}, [COEF_BLOCK, :128]!
vmul.s16 q8, q8, q0
vld1.16 {d4, d5, d6, d7}, [DCT_TABLE, :128]!
vmul.s16 q9, q9, q1
vld1.16 {d24, d25, d26, d27}, [COEF_BLOCK, :128]!
vmul.s16 q10, q10, q2
vld1.16 {d0, d1, d2, d3}, [DCT_TABLE, :128]!
vmul.s16 q11, q11, q3
vld1.16 {d28, d29, d30, d31}, [COEF_BLOCK, :128]
vmul.s16 q12, q12, q0
vld1.16 {d4, d5, d6, d7}, [DCT_TABLE, :128]!
vmul.s16 q14, q14, q2
vmul.s16 q13, q13, q1
vld1.16 {d0}, [ip, :64] /* load constants */
vmul.s16 q15, q15, q3
vpush {d8-d13} /* save NEON registers */
/* 1-D IDCT, pass 1 */
vsub.s16 q2, q10, q14
vadd.s16 q14, q10, q14
vsub.s16 q1, q11, q13
vadd.s16 q13, q11, q13
vsub.s16 q5, q9, q15
vadd.s16 q15, q9, q15
vqdmulh.s16 q4, q2, XFIX_1_414213562
vqdmulh.s16 q6, q1, XFIX_2_613125930
vadd.s16 q3, q1, q1
vsub.s16 q1, q5, q1
vadd.s16 q10, q2, q4
vqdmulh.s16 q4, q1, XFIX_1_847759065
vsub.s16 q2, q15, q13
vadd.s16 q3, q3, q6
vqdmulh.s16 q6, q2, XFIX_1_414213562
vadd.s16 q1, q1, q4
vqdmulh.s16 q4, q5, XFIX_1_082392200
vsub.s16 q10, q10, q14
vadd.s16 q2, q2, q6
vsub.s16 q6, q8, q12
vadd.s16 q12, q8, q12
vadd.s16 q9, q5, q4
vadd.s16 q5, q6, q10
vsub.s16 q10, q6, q10
vadd.s16 q6, q15, q13
vadd.s16 q8, q12, q14
vsub.s16 q3, q6, q3
vsub.s16 q12, q12, q14
vsub.s16 q3, q3, q1
vsub.s16 q1, q9, q1
vadd.s16 q2, q3, q2
vsub.s16 q15, q8, q6
vadd.s16 q1, q1, q2
vadd.s16 q8, q8, q6
vadd.s16 q14, q5, q3
vsub.s16 q9, q5, q3
vsub.s16 q13, q10, q2
vadd.s16 q10, q10, q2
/* Transpose */
vtrn.16 q8, q9
vsub.s16 q11, q12, q1
vtrn.16 q14, q15
vadd.s16 q12, q12, q1
vtrn.16 q10, q11
vtrn.16 q12, q13
vtrn.32 q9, q11
vtrn.32 q12, q14
vtrn.32 q8, q10
vtrn.32 q13, q15
vswp d28, d21
vswp d26, d19
/* 1-D IDCT, pass 2 */
vsub.s16 q2, q10, q14
vswp d30, d23
vadd.s16 q14, q10, q14
vswp d24, d17
vsub.s16 q1, q11, q13
vadd.s16 q13, q11, q13
vsub.s16 q5, q9, q15
vadd.s16 q15, q9, q15
vqdmulh.s16 q4, q2, XFIX_1_414213562
vqdmulh.s16 q6, q1, XFIX_2_613125930
vadd.s16 q3, q1, q1
vsub.s16 q1, q5, q1
vadd.s16 q10, q2, q4
vqdmulh.s16 q4, q1, XFIX_1_847759065
vsub.s16 q2, q15, q13
vadd.s16 q3, q3, q6
vqdmulh.s16 q6, q2, XFIX_1_414213562
vadd.s16 q1, q1, q4
vqdmulh.s16 q4, q5, XFIX_1_082392200
vsub.s16 q10, q10, q14
vadd.s16 q2, q2, q6
vsub.s16 q6, q8, q12
vadd.s16 q12, q8, q12
vadd.s16 q9, q5, q4
vadd.s16 q5, q6, q10
vsub.s16 q10, q6, q10
vadd.s16 q6, q15, q13
vadd.s16 q8, q12, q14
vsub.s16 q3, q6, q3
vsub.s16 q12, q12, q14
vsub.s16 q3, q3, q1
vsub.s16 q1, q9, q1
vadd.s16 q2, q3, q2
vsub.s16 q15, q8, q6
vadd.s16 q1, q1, q2
vadd.s16 q8, q8, q6
vadd.s16 q14, q5, q3
vsub.s16 q9, q5, q3
vsub.s16 q13, q10, q2
vpop {d8-d13} /* restore NEON registers */
vadd.s16 q10, q10, q2
vsub.s16 q11, q12, q1
vadd.s16 q12, q12, q1
/* Descale to 8-bit and range limit */
vmov.u8 q0, #0x80
vqshrn.s16 d16, q8, #5
vqshrn.s16 d17, q9, #5
vqshrn.s16 d18, q10, #5
vqshrn.s16 d19, q11, #5
vqshrn.s16 d20, q12, #5
vqshrn.s16 d21, q13, #5
vqshrn.s16 d22, q14, #5
vqshrn.s16 d23, q15, #5
vadd.u8 q8, q8, q0
vadd.u8 q9, q9, q0
vadd.u8 q10, q10, q0
vadd.u8 q11, q11, q0
/* Transpose the final 8-bit samples */
vtrn.16 q8, q9
vtrn.16 q10, q11
vtrn.32 q8, q10
vtrn.32 q9, q11
vtrn.8 d16, d17
vtrn.8 d18, d19
/* Store results to the output buffer */
ldmia OUTPUT_BUF!, {TMP1, TMP2}
add TMP1, TMP1, OUTPUT_COL
add TMP2, TMP2, OUTPUT_COL
vst1.8 {d16}, [TMP1]
vst1.8 {d17}, [TMP2]
ldmia OUTPUT_BUF!, {TMP1, TMP2}
add TMP1, TMP1, OUTPUT_COL
add TMP2, TMP2, OUTPUT_COL
vst1.8 {d18}, [TMP1]
vtrn.8 d20, d21
vst1.8 {d19}, [TMP2]
ldmia OUTPUT_BUF, {TMP1, TMP2, TMP3, TMP4}
add TMP1, TMP1, OUTPUT_COL
add TMP2, TMP2, OUTPUT_COL
add TMP3, TMP3, OUTPUT_COL
add TMP4, TMP4, OUTPUT_COL
vst1.8 {d20}, [TMP1]
vtrn.8 d22, d23
vst1.8 {d21}, [TMP2]
vst1.8 {d22}, [TMP3]
vst1.8 {d23}, [TMP4]
bx lr
.unreq DCT_TABLE
.unreq COEF_BLOCK
.unreq OUTPUT_BUF
.unreq OUTPUT_COL
.unreq TMP1
.unreq TMP2
.unreq TMP3
.unreq TMP4
/*****************************************************************************/
/*
* jsimd_idct_4x4_neon
*
* This function contains inverse-DCT code for getting reduced-size
* 4x4 pixels output from an 8x8 DCT block. It uses the same calculations
* and produces exactly the same output as IJG's original 'jpeg_idct_4x4'
* function from jpeg-6b (jidctred.c).
*
* NOTE: jpeg-8 has an improved implementation of 4x4 inverse-DCT, which
* requires much less arithmetic operations and hence should be faster.
* The primary purpose of this particular NEON optimized function is
* bit exact compatibility with jpeg-6b.
*
* TODO: a bit better instructions scheduling can be achieved by expanding
* idct_helper/transpose_4x4 macros and reordering instructions,
* but readability will suffer somewhat.
*/
#define CONST_BITS 13
#define FIX_0_211164243 (1730) /* FIX(0.211164243) */
#define FIX_0_509795579 (4176) /* FIX(0.509795579) */
#define FIX_0_601344887 (4926) /* FIX(0.601344887) */
#define FIX_0_720959822 (5906) /* FIX(0.720959822) */
#define FIX_0_765366865 (6270) /* FIX(0.765366865) */
#define FIX_0_850430095 (6967) /* FIX(0.850430095) */
#define FIX_0_899976223 (7373) /* FIX(0.899976223) */
#define FIX_1_061594337 (8697) /* FIX(1.061594337) */
#define FIX_1_272758580 (10426) /* FIX(1.272758580) */
#define FIX_1_451774981 (11893) /* FIX(1.451774981) */
#define FIX_1_847759065 (15137) /* FIX(1.847759065) */
#define FIX_2_172734803 (17799) /* FIX(2.172734803) */
#define FIX_2_562915447 (20995) /* FIX(2.562915447) */
#define FIX_3_624509785 (29692) /* FIX(3.624509785) */
.balign 16
jsimd_idct_4x4_neon_consts:
.short FIX_1_847759065 /* d0[0] */
.short -FIX_0_765366865 /* d0[1] */
.short -FIX_0_211164243 /* d0[2] */
.short FIX_1_451774981 /* d0[3] */
.short -FIX_2_172734803 /* d1[0] */
.short FIX_1_061594337 /* d1[1] */
.short -FIX_0_509795579 /* d1[2] */
.short -FIX_0_601344887 /* d1[3] */
.short FIX_0_899976223 /* d2[0] */
.short FIX_2_562915447 /* d2[1] */
.short 1 << (CONST_BITS+1) /* d2[2] */
.short 0 /* d2[3] */
.macro idct_helper x4, x6, x8, x10, x12, x14, x16, shift, y26, y27, y28, y29
vmull.s16 q14, \x4, d2[2]
vmlal.s16 q14, \x8, d0[0]
vmlal.s16 q14, \x14, d0[1]
vmull.s16 q13, \x16, d1[2]
vmlal.s16 q13, \x12, d1[3]
vmlal.s16 q13, \x10, d2[0]
vmlal.s16 q13, \x6, d2[1]
vmull.s16 q15, \x4, d2[2]
vmlsl.s16 q15, \x8, d0[0]
vmlsl.s16 q15, \x14, d0[1]
vmull.s16 q12, \x16, d0[2]
vmlal.s16 q12, \x12, d0[3]
vmlal.s16 q12, \x10, d1[0]
vmlal.s16 q12, \x6, d1[1]
vadd.s32 q10, q14, q13
vsub.s32 q14, q14, q13
.if \shift > 16
vrshr.s32 q10, q10, #\shift
vrshr.s32 q14, q14, #\shift
vmovn.s32 \y26, q10
vmovn.s32 \y29, q14
.else
vrshrn.s32 \y26, q10, #\shift
vrshrn.s32 \y29, q14, #\shift
.endif
vadd.s32 q10, q15, q12
vsub.s32 q15, q15, q12
.if \shift > 16
vrshr.s32 q10, q10, #\shift
vrshr.s32 q15, q15, #\shift
vmovn.s32 \y27, q10
vmovn.s32 \y28, q15
.else
vrshrn.s32 \y27, q10, #\shift
vrshrn.s32 \y28, q15, #\shift
.endif
.endm
asm_function jsimd_idct_4x4_neon
DCT_TABLE .req r0
COEF_BLOCK .req r1
OUTPUT_BUF .req r2
OUTPUT_COL .req r3
TMP1 .req r0
TMP2 .req r1
TMP3 .req r2
TMP4 .req ip
vpush {d8-d15}
/* Load constants (d3 is just used for padding) */
adr TMP4, jsimd_idct_4x4_neon_consts
vld1.16 {d0, d1, d2, d3}, [TMP4, :128]
/* Load all COEF_BLOCK into NEON registers with the following allocation:
* 0 1 2 3 | 4 5 6 7
* ---------+--------
* 0 | d4 | d5
* 1 | d6 | d7
* 2 | d8 | d9
* 3 | d10 | d11
* 4 | - | -
* 5 | d12 | d13
* 6 | d14 | d15
* 7 | d16 | d17
*/
vld1.16 {d4, d5, d6, d7}, [COEF_BLOCK, :128]!
vld1.16 {d8, d9, d10, d11}, [COEF_BLOCK, :128]!
add COEF_BLOCK, COEF_BLOCK, #16
vld1.16 {d12, d13, d14, d15}, [COEF_BLOCK, :128]!
vld1.16 {d16, d17}, [COEF_BLOCK, :128]!
/* dequantize */
vld1.16 {d18, d19, d20, d21}, [DCT_TABLE, :128]!
vmul.s16 q2, q2, q9
vld1.16 {d22, d23, d24, d25}, [DCT_TABLE, :128]!
vmul.s16 q3, q3, q10
vmul.s16 q4, q4, q11
add DCT_TABLE, DCT_TABLE, #16
vld1.16 {d26, d27, d28, d29}, [DCT_TABLE, :128]!
vmul.s16 q5, q5, q12
vmul.s16 q6, q6, q13
vld1.16 {d30, d31}, [DCT_TABLE, :128]!
vmul.s16 q7, q7, q14
vmul.s16 q8, q8, q15
/* Pass 1 */
idct_helper d4, d6, d8, d10, d12, d14, d16, 12, d4, d6, d8, d10
transpose_4x4 d4, d6, d8, d10
idct_helper d5, d7, d9, d11, d13, d15, d17, 12, d5, d7, d9, d11
transpose_4x4 d5, d7, d9, d11
/* Pass 2 */
idct_helper d4, d6, d8, d10, d7, d9, d11, 19, d26, d27, d28, d29
transpose_4x4 d26, d27, d28, d29
/* Range limit */
vmov.u16 q15, #0x80
vadd.s16 q13, q13, q15
vadd.s16 q14, q14, q15
vqmovun.s16 d26, q13
vqmovun.s16 d27, q14
/* Store results to the output buffer */
ldmia OUTPUT_BUF, {TMP1, TMP2, TMP3, TMP4}
add TMP1, TMP1, OUTPUT_COL
add TMP2, TMP2, OUTPUT_COL
add TMP3, TMP3, OUTPUT_COL
add TMP4, TMP4, OUTPUT_COL
#if defined(__ARMEL__) && !RESPECT_STRICT_ALIGNMENT
/* We can use much less instructions on little endian systems if the
* OS kernel is not configured to trap unaligned memory accesses
*/
vst1.32 {d26[0]}, [TMP1]!
vst1.32 {d27[0]}, [TMP3]!
vst1.32 {d26[1]}, [TMP2]!
vst1.32 {d27[1]}, [TMP4]!
#else
vst1.8 {d26[0]}, [TMP1]!
vst1.8 {d27[0]}, [TMP3]!
vst1.8 {d26[1]}, [TMP1]!
vst1.8 {d27[1]}, [TMP3]!
vst1.8 {d26[2]}, [TMP1]!
vst1.8 {d27[2]}, [TMP3]!
vst1.8 {d26[3]}, [TMP1]!
vst1.8 {d27[3]}, [TMP3]!
vst1.8 {d26[4]}, [TMP2]!
vst1.8 {d27[4]}, [TMP4]!
vst1.8 {d26[5]}, [TMP2]!
vst1.8 {d27[5]}, [TMP4]!
vst1.8 {d26[6]}, [TMP2]!
vst1.8 {d27[6]}, [TMP4]!
vst1.8 {d26[7]}, [TMP2]!
vst1.8 {d27[7]}, [TMP4]!
#endif
vpop {d8-d15}
bx lr
.unreq DCT_TABLE
.unreq COEF_BLOCK
.unreq OUTPUT_BUF
.unreq OUTPUT_COL
.unreq TMP1
.unreq TMP2
.unreq TMP3
.unreq TMP4
.purgem idct_helper
/*****************************************************************************/
/*
* jsimd_idct_2x2_neon
*
* This function contains inverse-DCT code for getting reduced-size
* 2x2 pixels output from an 8x8 DCT block. It uses the same calculations
* and produces exactly the same output as IJG's original 'jpeg_idct_2x2'
* function from jpeg-6b (jidctred.c).
*
* NOTE: jpeg-8 has an improved implementation of 2x2 inverse-DCT, which
* requires much less arithmetic operations and hence should be faster.
* The primary purpose of this particular NEON optimized function is
* bit exact compatibility with jpeg-6b.
*/
.balign 8
jsimd_idct_2x2_neon_consts:
.short -FIX_0_720959822 /* d0[0] */
.short FIX_0_850430095 /* d0[1] */
.short -FIX_1_272758580 /* d0[2] */
.short FIX_3_624509785 /* d0[3] */
.macro idct_helper x4, x6, x10, x12, x16, shift, y26, y27
vshll.s16 q14, \x4, #15
vmull.s16 q13, \x6, d0[3]
vmlal.s16 q13, \x10, d0[2]
vmlal.s16 q13, \x12, d0[1]
vmlal.s16 q13, \x16, d0[0]
vadd.s32 q10, q14, q13
vsub.s32 q14, q14, q13
.if \shift > 16
vrshr.s32 q10, q10, #\shift
vrshr.s32 q14, q14, #\shift
vmovn.s32 \y26, q10
vmovn.s32 \y27, q14
.else
vrshrn.s32 \y26, q10, #\shift
vrshrn.s32 \y27, q14, #\shift
.endif
.endm
asm_function jsimd_idct_2x2_neon
DCT_TABLE .req r0
COEF_BLOCK .req r1
OUTPUT_BUF .req r2
OUTPUT_COL .req r3
TMP1 .req r0
TMP2 .req ip
vpush {d8-d15}
/* Load constants */
adr TMP2, jsimd_idct_2x2_neon_consts
vld1.16 {d0}, [TMP2, :64]
/* Load all COEF_BLOCK into NEON registers with the following allocation:
* 0 1 2 3 | 4 5 6 7
* ---------+--------
* 0 | d4 | d5
* 1 | d6 | d7
* 2 | - | -
* 3 | d10 | d11
* 4 | - | -
* 5 | d12 | d13
* 6 | - | -
* 7 | d16 | d17
*/
vld1.16 {d4, d5, d6, d7}, [COEF_BLOCK, :128]!
add COEF_BLOCK, COEF_BLOCK, #16
vld1.16 {d10, d11}, [COEF_BLOCK, :128]!
add COEF_BLOCK, COEF_BLOCK, #16
vld1.16 {d12, d13}, [COEF_BLOCK, :128]!
add COEF_BLOCK, COEF_BLOCK, #16
vld1.16 {d16, d17}, [COEF_BLOCK, :128]!
/* Dequantize */
vld1.16 {d18, d19, d20, d21}, [DCT_TABLE, :128]!
vmul.s16 q2, q2, q9
vmul.s16 q3, q3, q10
add DCT_TABLE, DCT_TABLE, #16
vld1.16 {d24, d25}, [DCT_TABLE, :128]!
vmul.s16 q5, q5, q12
add DCT_TABLE, DCT_TABLE, #16
vld1.16 {d26, d27}, [DCT_TABLE, :128]!
vmul.s16 q6, q6, q13
add DCT_TABLE, DCT_TABLE, #16
vld1.16 {d30, d31}, [DCT_TABLE, :128]!
vmul.s16 q8, q8, q15
/* Pass 1 */
#if 0
idct_helper d4, d6, d10, d12, d16, 13, d4, d6
transpose_4x4 d4, d6, d8, d10
idct_helper d5, d7, d11, d13, d17, 13, d5, d7
transpose_4x4 d5, d7, d9, d11
#else
vmull.s16 q13, d6, d0[3]
vmlal.s16 q13, d10, d0[2]
vmlal.s16 q13, d12, d0[1]
vmlal.s16 q13, d16, d0[0]
vmull.s16 q12, d7, d0[3]
vmlal.s16 q12, d11, d0[2]
vmlal.s16 q12, d13, d0[1]
vmlal.s16 q12, d17, d0[0]
vshll.s16 q14, d4, #15
vshll.s16 q15, d5, #15
vadd.s32 q10, q14, q13
vsub.s32 q14, q14, q13
vrshrn.s32 d4, q10, #13
vrshrn.s32 d6, q14, #13
vadd.s32 q10, q15, q12
vsub.s32 q14, q15, q12
vrshrn.s32 d5, q10, #13
vrshrn.s32 d7, q14, #13
vtrn.16 q2, q3
vtrn.32 q3, q5
#endif
/* Pass 2 */
idct_helper d4, d6, d10, d7, d11, 20, d26, d27
/* Range limit */
vmov.u16 q15, #0x80
vadd.s16 q13, q13, q15
vqmovun.s16 d26, q13
vqmovun.s16 d27, q13
/* Store results to the output buffer */
ldmia OUTPUT_BUF, {TMP1, TMP2}
add TMP1, TMP1, OUTPUT_COL
add TMP2, TMP2, OUTPUT_COL
vst1.8 {d26[0]}, [TMP1]!
vst1.8 {d27[4]}, [TMP1]!
vst1.8 {d26[1]}, [TMP2]!
vst1.8 {d27[5]}, [TMP2]!
vpop {d8-d15}
bx lr
.unreq DCT_TABLE
.unreq COEF_BLOCK
.unreq OUTPUT_BUF
.unreq OUTPUT_COL
.unreq TMP1
.unreq TMP2
.purgem idct_helper
/*****************************************************************************/
/*
* jsimd_ycc_extrgb_convert_neon
* jsimd_ycc_extbgr_convert_neon
* jsimd_ycc_extrgbx_convert_neon
* jsimd_ycc_extbgrx_convert_neon
* jsimd_ycc_extxbgr_convert_neon
* jsimd_ycc_extxrgb_convert_neon
*
* Colorspace conversion YCbCr -> RGB
*/
.macro do_load size
.if \size == 8
vld1.8 {d4}, [U, :64]!
vld1.8 {d5}, [V, :64]!
vld1.8 {d0}, [Y, :64]!
pld [U, #64]
pld [V, #64]
pld [Y, #64]
.elseif \size == 4
vld1.8 {d4[0]}, [U]!
vld1.8 {d4[1]}, [U]!
vld1.8 {d4[2]}, [U]!
vld1.8 {d4[3]}, [U]!
vld1.8 {d5[0]}, [V]!
vld1.8 {d5[1]}, [V]!
vld1.8 {d5[2]}, [V]!
vld1.8 {d5[3]}, [V]!
vld1.8 {d0[0]}, [Y]!
vld1.8 {d0[1]}, [Y]!
vld1.8 {d0[2]}, [Y]!
vld1.8 {d0[3]}, [Y]!
.elseif \size == 2
vld1.8 {d4[4]}, [U]!
vld1.8 {d4[5]}, [U]!
vld1.8 {d5[4]}, [V]!
vld1.8 {d5[5]}, [V]!
vld1.8 {d0[4]}, [Y]!
vld1.8 {d0[5]}, [Y]!
.elseif \size == 1
vld1.8 {d4[6]}, [U]!
vld1.8 {d5[6]}, [V]!
vld1.8 {d0[6]}, [Y]!
.else
.error unsupported macroblock size
.endif
.endm
.macro do_store bpp, size
.if \bpp == 24
.if \size == 8
vst3.8 {d10, d11, d12}, [RGB]!
.elseif \size == 4
vst3.8 {d10[0], d11[0], d12[0]}, [RGB]!
vst3.8 {d10[1], d11[1], d12[1]}, [RGB]!
vst3.8 {d10[2], d11[2], d12[2]}, [RGB]!
vst3.8 {d10[3], d11[3], d12[3]}, [RGB]!
.elseif \size == 2
vst3.8 {d10[4], d11[4], d12[4]}, [RGB]!
vst3.8 {d10[5], d11[5], d12[5]}, [RGB]!
.elseif \size == 1
vst3.8 {d10[6], d11[6], d12[6]}, [RGB]!
.else
.error unsupported macroblock size
.endif
.elseif \bpp == 32
.if \size == 8
vst4.8 {d10, d11, d12, d13}, [RGB]!
.elseif \size == 4
vst4.8 {d10[0], d11[0], d12[0], d13[0]}, [RGB]!
vst4.8 {d10[1], d11[1], d12[1], d13[1]}, [RGB]!
vst4.8 {d10[2], d11[2], d12[2], d13[2]}, [RGB]!
vst4.8 {d10[3], d11[3], d12[3], d13[3]}, [RGB]!
.elseif \size == 2
vst4.8 {d10[4], d11[4], d12[4], d13[4]}, [RGB]!
vst4.8 {d10[5], d11[5], d12[5], d13[5]}, [RGB]!
.elseif \size == 1
vst4.8 {d10[6], d11[6], d12[6], d13[6]}, [RGB]!
.else
.error unsupported macroblock size
.endif
.elseif \bpp == 16
.if \size == 8
vst1.16 {q15}, [RGB]!
.elseif \size == 4
vst1.16 {d30}, [RGB]!
.elseif \size == 2
vst1.16 {d31[0]}, [RGB]!
vst1.16 {d31[1]}, [RGB]!
.elseif \size == 1
vst1.16 {d31[2]}, [RGB]!
.else
.error unsupported macroblock size
.endif
.else
.error unsupported bpp
.endif
.endm
.macro generate_jsimd_ycc_rgb_convert_neon colorid, bpp, r_offs, g_offs, b_offs
/*
* 2 stage pipelined YCbCr->RGB conversion
*/
.macro do_yuv_to_rgb_stage1
vaddw.u8 q3, q1, d4 /* q3 = u - 128 */
vaddw.u8 q4, q1, d5 /* q2 = v - 128 */
vmull.s16 q10, d6, d1[1] /* multiply by -11277 */
vmlal.s16 q10, d8, d1[2] /* multiply by -23401 */
vmull.s16 q11, d7, d1[1] /* multiply by -11277 */
vmlal.s16 q11, d9, d1[2] /* multiply by -23401 */
vmull.s16 q12, d8, d1[0] /* multiply by 22971 */
vmull.s16 q13, d9, d1[0] /* multiply by 22971 */
vmull.s16 q14, d6, d1[3] /* multiply by 29033 */
vmull.s16 q15, d7, d1[3] /* multiply by 29033 */
.endm
.macro do_yuv_to_rgb_stage2
vrshrn.s32 d20, q10, #15
vrshrn.s32 d21, q11, #15
vrshrn.s32 d24, q12, #14
vrshrn.s32 d25, q13, #14
vrshrn.s32 d28, q14, #14
vrshrn.s32 d29, q15, #14
vaddw.u8 q11, q10, d0
vaddw.u8 q12, q12, d0
vaddw.u8 q14, q14, d0
.if \bpp != 16
vqmovun.s16 d1\g_offs, q11
vqmovun.s16 d1\r_offs, q12
vqmovun.s16 d1\b_offs, q14
.else /* rgb565 */
vqshlu.s16 q13, q11, #8
vqshlu.s16 q15, q12, #8
vqshlu.s16 q14, q14, #8
vsri.u16 q15, q13, #5
vsri.u16 q15, q14, #11
.endif
.endm
.macro do_yuv_to_rgb_stage2_store_load_stage1
/* "do_yuv_to_rgb_stage2" and "store" */
vrshrn.s32 d20, q10, #15
/* "load" and "do_yuv_to_rgb_stage1" */
pld [U, #64]
vrshrn.s32 d21, q11, #15
pld [V, #64]
vrshrn.s32 d24, q12, #14
vrshrn.s32 d25, q13, #14
vld1.8 {d4}, [U, :64]!
vrshrn.s32 d28, q14, #14
vld1.8 {d5}, [V, :64]!
vrshrn.s32 d29, q15, #14
vaddw.u8 q3, q1, d4 /* q3 = u - 128 */
vaddw.u8 q4, q1, d5 /* q2 = v - 128 */
vaddw.u8 q11, q10, d0
vmull.s16 q10, d6, d1[1] /* multiply by -11277 */
vmlal.s16 q10, d8, d1[2] /* multiply by -23401 */
vaddw.u8 q12, q12, d0
vaddw.u8 q14, q14, d0
.if \bpp != 16 /**************** rgb24/rgb32 *********************************/
vqmovun.s16 d1\g_offs, q11
pld [Y, #64]
vqmovun.s16 d1\r_offs, q12
vld1.8 {d0}, [Y, :64]!
vqmovun.s16 d1\b_offs, q14
vmull.s16 q11, d7, d1[1] /* multiply by -11277 */
vmlal.s16 q11, d9, d1[2] /* multiply by -23401 */
do_store \bpp, 8
vmull.s16 q12, d8, d1[0] /* multiply by 22971 */
vmull.s16 q13, d9, d1[0] /* multiply by 22971 */
vmull.s16 q14, d6, d1[3] /* multiply by 29033 */
vmull.s16 q15, d7, d1[3] /* multiply by 29033 */
.else /**************************** rgb565 ***********************************/
vqshlu.s16 q13, q11, #8
pld [Y, #64]
vqshlu.s16 q15, q12, #8
vqshlu.s16 q14, q14, #8
vld1.8 {d0}, [Y, :64]!
vmull.s16 q11, d7, d1[1]
vmlal.s16 q11, d9, d1[2]
vsri.u16 q15, q13, #5
vmull.s16 q12, d8, d1[0]
vsri.u16 q15, q14, #11
vmull.s16 q13, d9, d1[0]
vmull.s16 q14, d6, d1[3]
do_store \bpp, 8
vmull.s16 q15, d7, d1[3]
.endif
.endm
.macro do_yuv_to_rgb
do_yuv_to_rgb_stage1
do_yuv_to_rgb_stage2
.endm
/* Apple gas crashes on adrl, work around that by using adr.
* But this requires a copy of these constants for each function.
*/
.balign 16
jsimd_ycc_\colorid\()_neon_consts:
.short 0, 0, 0, 0
.short 22971, -11277, -23401, 29033
.short -128, -128, -128, -128
.short -128, -128, -128, -128
asm_function jsimd_ycc_\colorid\()_convert_neon
OUTPUT_WIDTH .req r0
INPUT_BUF .req r1
INPUT_ROW .req r2
OUTPUT_BUF .req r3
NUM_ROWS .req r4
INPUT_BUF0 .req r5
INPUT_BUF1 .req r6
INPUT_BUF2 .req INPUT_BUF
RGB .req r7
Y .req r8
U .req r9
V .req r10
N .req ip
/* Load constants to d1, d2, d3 (d0 is just used for padding) */
adr ip, jsimd_ycc_\colorid\()_neon_consts
vld1.16 {d0, d1, d2, d3}, [ip, :128]
/* Save ARM registers and handle input arguments */
push {r4, r5, r6, r7, r8, r9, r10, lr}
ldr NUM_ROWS, [sp, #(4 * 8)]
ldr INPUT_BUF0, [INPUT_BUF]
ldr INPUT_BUF1, [INPUT_BUF, #4]
ldr INPUT_BUF2, [INPUT_BUF, #8]
.unreq INPUT_BUF
/* Save NEON registers */
vpush {d8-d15}
/* Initially set d10, d11, d12, d13 to 0xFF */
vmov.u8 q5, #255
vmov.u8 q6, #255
/* Outer loop over scanlines */
cmp NUM_ROWS, #1
blt 9f
0:
ldr Y, [INPUT_BUF0, INPUT_ROW, lsl #2]
ldr U, [INPUT_BUF1, INPUT_ROW, lsl #2]
mov N, OUTPUT_WIDTH
ldr V, [INPUT_BUF2, INPUT_ROW, lsl #2]
add INPUT_ROW, INPUT_ROW, #1
ldr RGB, [OUTPUT_BUF], #4
/* Inner loop over pixels */
subs N, N, #8
blt 3f
do_load 8
do_yuv_to_rgb_stage1
subs N, N, #8
blt 2f
1:
do_yuv_to_rgb_stage2_store_load_stage1
subs N, N, #8
bge 1b
2:
do_yuv_to_rgb_stage2
do_store \bpp, 8
tst N, #7
beq 8f
3:
tst N, #4
beq 3f
do_load 4
3:
tst N, #2
beq 4f
do_load 2
4:
tst N, #1
beq 5f
do_load 1
5:
do_yuv_to_rgb
tst N, #4
beq 6f
do_store \bpp, 4
6:
tst N, #2
beq 7f
do_store \bpp, 2
7:
tst N, #1
beq 8f
do_store \bpp, 1
8:
subs NUM_ROWS, NUM_ROWS, #1
bgt 0b
9:
/* Restore all registers and return */
vpop {d8-d15}
pop {r4, r5, r6, r7, r8, r9, r10, pc}
.unreq OUTPUT_WIDTH
.unreq INPUT_ROW
.unreq OUTPUT_BUF
.unreq NUM_ROWS
.unreq INPUT_BUF0
.unreq INPUT_BUF1
.unreq INPUT_BUF2
.unreq RGB
.unreq Y
.unreq U
.unreq V
.unreq N
.purgem do_yuv_to_rgb
.purgem do_yuv_to_rgb_stage1
.purgem do_yuv_to_rgb_stage2
.purgem do_yuv_to_rgb_stage2_store_load_stage1
.endm
/*--------------------------------- id ----- bpp R G B */
generate_jsimd_ycc_rgb_convert_neon extrgb, 24, 0, 1, 2
generate_jsimd_ycc_rgb_convert_neon extbgr, 24, 2, 1, 0
generate_jsimd_ycc_rgb_convert_neon extrgbx, 32, 0, 1, 2
generate_jsimd_ycc_rgb_convert_neon extbgrx, 32, 2, 1, 0
generate_jsimd_ycc_rgb_convert_neon extxbgr, 32, 3, 2, 1
generate_jsimd_ycc_rgb_convert_neon extxrgb, 32, 1, 2, 3
generate_jsimd_ycc_rgb_convert_neon rgb565, 16, 0, 0, 0
.purgem do_load
.purgem do_store
/*****************************************************************************/
/*
* jsimd_extrgb_ycc_convert_neon
* jsimd_extbgr_ycc_convert_neon
* jsimd_extrgbx_ycc_convert_neon
* jsimd_extbgrx_ycc_convert_neon
* jsimd_extxbgr_ycc_convert_neon
* jsimd_extxrgb_ycc_convert_neon
*
* Colorspace conversion RGB -> YCbCr
*/
.macro do_store size
.if \size == 8
vst1.8 {d20}, [Y]!
vst1.8 {d21}, [U]!
vst1.8 {d22}, [V]!
.elseif \size == 4
vst1.8 {d20[0]}, [Y]!
vst1.8 {d20[1]}, [Y]!
vst1.8 {d20[2]}, [Y]!
vst1.8 {d20[3]}, [Y]!
vst1.8 {d21[0]}, [U]!
vst1.8 {d21[1]}, [U]!
vst1.8 {d21[2]}, [U]!
vst1.8 {d21[3]}, [U]!
vst1.8 {d22[0]}, [V]!
vst1.8 {d22[1]}, [V]!
vst1.8 {d22[2]}, [V]!
vst1.8 {d22[3]}, [V]!
.elseif \size == 2
vst1.8 {d20[4]}, [Y]!
vst1.8 {d20[5]}, [Y]!
vst1.8 {d21[4]}, [U]!
vst1.8 {d21[5]}, [U]!
vst1.8 {d22[4]}, [V]!
vst1.8 {d22[5]}, [V]!
.elseif \size == 1
vst1.8 {d20[6]}, [Y]!
vst1.8 {d21[6]}, [U]!
vst1.8 {d22[6]}, [V]!
.else
.error unsupported macroblock size
.endif
.endm
.macro do_load bpp, size
.if \bpp == 24
.if \size == 8
vld3.8 {d10, d11, d12}, [RGB]!
pld [RGB, #128]
.elseif \size == 4
vld3.8 {d10[0], d11[0], d12[0]}, [RGB]!
vld3.8 {d10[1], d11[1], d12[1]}, [RGB]!
vld3.8 {d10[2], d11[2], d12[2]}, [RGB]!
vld3.8 {d10[3], d11[3], d12[3]}, [RGB]!
.elseif \size == 2
vld3.8 {d10[4], d11[4], d12[4]}, [RGB]!
vld3.8 {d10[5], d11[5], d12[5]}, [RGB]!
.elseif \size == 1
vld3.8 {d10[6], d11[6], d12[6]}, [RGB]!
.else
.error unsupported macroblock size
.endif
.elseif \bpp == 32
.if \size == 8
vld4.8 {d10, d11, d12, d13}, [RGB]!
pld [RGB, #128]
.elseif \size == 4
vld4.8 {d10[0], d11[0], d12[0], d13[0]}, [RGB]!
vld4.8 {d10[1], d11[1], d12[1], d13[1]}, [RGB]!
vld4.8 {d10[2], d11[2], d12[2], d13[2]}, [RGB]!
vld4.8 {d10[3], d11[3], d12[3], d13[3]}, [RGB]!
.elseif \size == 2
vld4.8 {d10[4], d11[4], d12[4], d13[4]}, [RGB]!
vld4.8 {d10[5], d11[5], d12[5], d13[5]}, [RGB]!
.elseif \size == 1
vld4.8 {d10[6], d11[6], d12[6], d13[6]}, [RGB]!
.else
.error unsupported macroblock size
.endif
.else
.error unsupported bpp
.endif
.endm
.macro generate_jsimd_rgb_ycc_convert_neon colorid, bpp, r_offs, g_offs, b_offs
/*
* 2 stage pipelined RGB->YCbCr conversion
*/
.macro do_rgb_to_yuv_stage1
vmovl.u8 q2, d1\r_offs /* r = { d4, d5 } */
vmovl.u8 q3, d1\g_offs /* g = { d6, d7 } */
vmovl.u8 q4, d1\b_offs /* b = { d8, d9 } */
vmull.u16 q7, d4, d0[0]
vmlal.u16 q7, d6, d0[1]
vmlal.u16 q7, d8, d0[2]
vmull.u16 q8, d5, d0[0]
vmlal.u16 q8, d7, d0[1]
vmlal.u16 q8, d9, d0[2]
vrev64.32 q9, q1
vrev64.32 q13, q1
vmlsl.u16 q9, d4, d0[3]
vmlsl.u16 q9, d6, d1[0]
vmlal.u16 q9, d8, d1[1]
vmlsl.u16 q13, d5, d0[3]
vmlsl.u16 q13, d7, d1[0]
vmlal.u16 q13, d9, d1[1]
vrev64.32 q14, q1
vrev64.32 q15, q1
vmlal.u16 q14, d4, d1[1]
vmlsl.u16 q14, d6, d1[2]
vmlsl.u16 q14, d8, d1[3]
vmlal.u16 q15, d5, d1[1]
vmlsl.u16 q15, d7, d1[2]
vmlsl.u16 q15, d9, d1[3]
.endm
.macro do_rgb_to_yuv_stage2
vrshrn.u32 d20, q7, #16
vrshrn.u32 d21, q8, #16
vshrn.u32 d22, q9, #16
vshrn.u32 d23, q13, #16
vshrn.u32 d24, q14, #16
vshrn.u32 d25, q15, #16
vmovn.u16 d20, q10 /* d20 = y */
vmovn.u16 d21, q11 /* d21 = u */
vmovn.u16 d22, q12 /* d22 = v */
.endm
.macro do_rgb_to_yuv
do_rgb_to_yuv_stage1
do_rgb_to_yuv_stage2
.endm
.macro do_rgb_to_yuv_stage2_store_load_stage1
vrshrn.u32 d20, q7, #16
vrshrn.u32 d21, q8, #16
vshrn.u32 d22, q9, #16
vrev64.32 q9, q1
vshrn.u32 d23, q13, #16
vrev64.32 q13, q1
vshrn.u32 d24, q14, #16
vshrn.u32 d25, q15, #16
do_load \bpp, 8
vmovn.u16 d20, q10 /* d20 = y */
vmovl.u8 q2, d1\r_offs /* r = { d4, d5 } */
vmovn.u16 d21, q11 /* d21 = u */
vmovl.u8 q3, d1\g_offs /* g = { d6, d7 } */
vmovn.u16 d22, q12 /* d22 = v */
vmovl.u8 q4, d1\b_offs /* b = { d8, d9 } */
vmull.u16 q7, d4, d0[0]
vmlal.u16 q7, d6, d0[1]
vmlal.u16 q7, d8, d0[2]
vst1.8 {d20}, [Y]!
vmull.u16 q8, d5, d0[0]
vmlal.u16 q8, d7, d0[1]
vmlal.u16 q8, d9, d0[2]
vmlsl.u16 q9, d4, d0[3]
vmlsl.u16 q9, d6, d1[0]
vmlal.u16 q9, d8, d1[1]
vst1.8 {d21}, [U]!
vmlsl.u16 q13, d5, d0[3]
vmlsl.u16 q13, d7, d1[0]
vmlal.u16 q13, d9, d1[1]
vrev64.32 q14, q1
vrev64.32 q15, q1
vmlal.u16 q14, d4, d1[1]
vmlsl.u16 q14, d6, d1[2]
vmlsl.u16 q14, d8, d1[3]
vst1.8 {d22}, [V]!
vmlal.u16 q15, d5, d1[1]
vmlsl.u16 q15, d7, d1[2]
vmlsl.u16 q15, d9, d1[3]
.endm
.balign 16
jsimd_\colorid\()_ycc_neon_consts:
.short 19595, 38470, 7471, 11059
.short 21709, 32768, 27439, 5329
.short 32767, 128, 32767, 128
.short 32767, 128, 32767, 128
asm_function jsimd_\colorid\()_ycc_convert_neon
OUTPUT_WIDTH .req r0
INPUT_BUF .req r1
OUTPUT_BUF .req r2
OUTPUT_ROW .req r3
NUM_ROWS .req r4
OUTPUT_BUF0 .req r5
OUTPUT_BUF1 .req r6
OUTPUT_BUF2 .req OUTPUT_BUF
RGB .req r7
Y .req r8
U .req r9
V .req r10
N .req ip
/* Load constants to d0, d1, d2, d3 */
adr ip, jsimd_\colorid\()_ycc_neon_consts
vld1.16 {d0, d1, d2, d3}, [ip, :128]
/* Save ARM registers and handle input arguments */
push {r4, r5, r6, r7, r8, r9, r10, lr}
ldr NUM_ROWS, [sp, #(4 * 8)]
ldr OUTPUT_BUF0, [OUTPUT_BUF]
ldr OUTPUT_BUF1, [OUTPUT_BUF, #4]
ldr OUTPUT_BUF2, [OUTPUT_BUF, #8]
.unreq OUTPUT_BUF
/* Save NEON registers */
vpush {d8-d15}
/* Outer loop over scanlines */
cmp NUM_ROWS, #1
blt 9f
0:
ldr Y, [OUTPUT_BUF0, OUTPUT_ROW, lsl #2]
ldr U, [OUTPUT_BUF1, OUTPUT_ROW, lsl #2]
mov N, OUTPUT_WIDTH
ldr V, [OUTPUT_BUF2, OUTPUT_ROW, lsl #2]
add OUTPUT_ROW, OUTPUT_ROW, #1
ldr RGB, [INPUT_BUF], #4
/* Inner loop over pixels */
subs N, N, #8
blt 3f
do_load \bpp, 8
do_rgb_to_yuv_stage1
subs N, N, #8
blt 2f
1:
do_rgb_to_yuv_stage2_store_load_stage1
subs N, N, #8
bge 1b
2:
do_rgb_to_yuv_stage2
do_store 8
tst N, #7
beq 8f
3:
tst N, #4
beq 3f
do_load \bpp, 4
3:
tst N, #2
beq 4f
do_load \bpp, 2
4:
tst N, #1
beq 5f
do_load \bpp, 1
5:
do_rgb_to_yuv
tst N, #4
beq 6f
do_store 4
6:
tst N, #2
beq 7f
do_store 2
7:
tst N, #1
beq 8f
do_store 1
8:
subs NUM_ROWS, NUM_ROWS, #1
bgt 0b
9:
/* Restore all registers and return */
vpop {d8-d15}
pop {r4, r5, r6, r7, r8, r9, r10, pc}
.unreq OUTPUT_WIDTH
.unreq OUTPUT_ROW
.unreq INPUT_BUF
.unreq NUM_ROWS
.unreq OUTPUT_BUF0
.unreq OUTPUT_BUF1
.unreq OUTPUT_BUF2
.unreq RGB
.unreq Y
.unreq U
.unreq V
.unreq N
.purgem do_rgb_to_yuv
.purgem do_rgb_to_yuv_stage1
.purgem do_rgb_to_yuv_stage2
.purgem do_rgb_to_yuv_stage2_store_load_stage1
.endm
/*--------------------------------- id ----- bpp R G B */
generate_jsimd_rgb_ycc_convert_neon extrgb, 24, 0, 1, 2
generate_jsimd_rgb_ycc_convert_neon extbgr, 24, 2, 1, 0
generate_jsimd_rgb_ycc_convert_neon extrgbx, 32, 0, 1, 2
generate_jsimd_rgb_ycc_convert_neon extbgrx, 32, 2, 1, 0
generate_jsimd_rgb_ycc_convert_neon extxbgr, 32, 3, 2, 1
generate_jsimd_rgb_ycc_convert_neon extxrgb, 32, 1, 2, 3
.purgem do_load
.purgem do_store
/*****************************************************************************/
/*
* Load data into workspace, applying unsigned->signed conversion
*
* TODO: can be combined with 'jsimd_fdct_ifast_neon' to get
* rid of VST1.16 instructions
*/
asm_function jsimd_convsamp_neon
SAMPLE_DATA .req r0
START_COL .req r1
WORKSPACE .req r2
TMP1 .req r3
TMP2 .req r4
TMP3 .req r5
TMP4 .req ip
push {r4, r5}
vmov.u8 d0, #128
ldmia SAMPLE_DATA!, {TMP1, TMP2, TMP3, TMP4}
add TMP1, TMP1, START_COL
add TMP2, TMP2, START_COL
add TMP3, TMP3, START_COL
add TMP4, TMP4, START_COL
vld1.8 {d16}, [TMP1]
vsubl.u8 q8, d16, d0
vld1.8 {d18}, [TMP2]
vsubl.u8 q9, d18, d0
vld1.8 {d20}, [TMP3]
vsubl.u8 q10, d20, d0
vld1.8 {d22}, [TMP4]
ldmia SAMPLE_DATA!, {TMP1, TMP2, TMP3, TMP4}
vsubl.u8 q11, d22, d0
vst1.16 {d16, d17, d18, d19}, [WORKSPACE, :128]!
add TMP1, TMP1, START_COL
add TMP2, TMP2, START_COL
vst1.16 {d20, d21, d22, d23}, [WORKSPACE, :128]!
add TMP3, TMP3, START_COL
add TMP4, TMP4, START_COL
vld1.8 {d24}, [TMP1]
vsubl.u8 q12, d24, d0
vld1.8 {d26}, [TMP2]
vsubl.u8 q13, d26, d0
vld1.8 {d28}, [TMP3]
vsubl.u8 q14, d28, d0
vld1.8 {d30}, [TMP4]
vsubl.u8 q15, d30, d0
vst1.16 {d24, d25, d26, d27}, [WORKSPACE, :128]!
vst1.16 {d28, d29, d30, d31}, [WORKSPACE, :128]!
pop {r4, r5}
bx lr
.unreq SAMPLE_DATA
.unreq START_COL
.unreq WORKSPACE
.unreq TMP1
.unreq TMP2
.unreq TMP3
.unreq TMP4
/*****************************************************************************/
/*
* jsimd_fdct_ifast_neon
*
* This function contains a fast, not so accurate integer implementation of
* the forward DCT (Discrete Cosine Transform). It uses the same calculations
* and produces exactly the same output as IJG's original 'jpeg_fdct_ifast'
* function from jfdctfst.c
*
* TODO: can be combined with 'jsimd_convsamp_neon' to get
* rid of a bunch of VLD1.16 instructions
*/
#define XFIX_0_382683433 d0[0]
#define XFIX_0_541196100 d0[1]
#define XFIX_0_707106781 d0[2]
#define XFIX_1_306562965 d0[3]
.balign 16
jsimd_fdct_ifast_neon_consts:
.short (98 * 128) /* XFIX_0_382683433 */
.short (139 * 128) /* XFIX_0_541196100 */
.short (181 * 128) /* XFIX_0_707106781 */
.short (334 * 128 - 256 * 128) /* XFIX_1_306562965 */
asm_function jsimd_fdct_ifast_neon
DATA .req r0
TMP .req ip
vpush {d8-d15}
/* Load constants */
adr TMP, jsimd_fdct_ifast_neon_consts
vld1.16 {d0}, [TMP, :64]
/* Load all DATA into NEON registers with the following allocation:
* 0 1 2 3 | 4 5 6 7
* ---------+--------
* 0 | d16 | d17 | q8
* 1 | d18 | d19 | q9
* 2 | d20 | d21 | q10
* 3 | d22 | d23 | q11
* 4 | d24 | d25 | q12
* 5 | d26 | d27 | q13
* 6 | d28 | d29 | q14
* 7 | d30 | d31 | q15
*/
vld1.16 {d16, d17, d18, d19}, [DATA, :128]!
vld1.16 {d20, d21, d22, d23}, [DATA, :128]!
vld1.16 {d24, d25, d26, d27}, [DATA, :128]!
vld1.16 {d28, d29, d30, d31}, [DATA, :128]
sub DATA, DATA, #(128 - 32)
mov TMP, #2
1:
/* Transpose */
vtrn.16 q12, q13
vtrn.16 q10, q11
vtrn.16 q8, q9
vtrn.16 q14, q15
vtrn.32 q9, q11
vtrn.32 q13, q15
vtrn.32 q8, q10
vtrn.32 q12, q14
vswp d30, d23
vswp d24, d17
vswp d26, d19
/* 1-D FDCT */
vadd.s16 q2, q11, q12
vswp d28, d21
vsub.s16 q12, q11, q12
vsub.s16 q6, q10, q13
vadd.s16 q10, q10, q13
vsub.s16 q7, q9, q14
vadd.s16 q9, q9, q14
vsub.s16 q1, q8, q15
vadd.s16 q8, q8, q15
vsub.s16 q4, q9, q10
vsub.s16 q5, q8, q2
vadd.s16 q3, q9, q10
vadd.s16 q4, q4, q5
vadd.s16 q2, q8, q2
vqdmulh.s16 q4, q4, XFIX_0_707106781
vadd.s16 q11, q12, q6
vadd.s16 q8, q2, q3
vsub.s16 q12, q2, q3
vadd.s16 q3, q6, q7
vadd.s16 q7, q7, q1
vqdmulh.s16 q3, q3, XFIX_0_707106781
vsub.s16 q6, q11, q7
vadd.s16 q10, q5, q4
vqdmulh.s16 q6, q6, XFIX_0_382683433
vsub.s16 q14, q5, q4
vqdmulh.s16 q11, q11, XFIX_0_541196100
vqdmulh.s16 q5, q7, XFIX_1_306562965
vadd.s16 q4, q1, q3
vsub.s16 q3, q1, q3
vadd.s16 q7, q7, q6
vadd.s16 q11, q11, q6
vadd.s16 q7, q7, q5
vadd.s16 q13, q3, q11
vsub.s16 q11, q3, q11
vadd.s16 q9, q4, q7
vsub.s16 q15, q4, q7
subs TMP, TMP, #1
bne 1b
/* store results */
vst1.16 {d16, d17, d18, d19}, [DATA, :128]!
vst1.16 {d20, d21, d22, d23}, [DATA, :128]!
vst1.16 {d24, d25, d26, d27}, [DATA, :128]!
vst1.16 {d28, d29, d30, d31}, [DATA, :128]
vpop {d8-d15}
bx lr
.unreq DATA
.unreq TMP
/*****************************************************************************/
/*
* GLOBAL(void)
* jsimd_quantize_neon (JCOEFPTR coef_block, DCTELEM * divisors,
* DCTELEM * workspace);
*
* Note: the code uses 2 stage pipelining in order to improve instructions
* scheduling and eliminate stalls (this provides ~15% better
* performance for this function on both ARM Cortex-A8 and
* ARM Cortex-A9 when compared to the non-pipelined variant).
* The instructions which belong to the second stage use different
* indentation for better readiability.
*/
asm_function jsimd_quantize_neon
COEF_BLOCK .req r0
DIVISORS .req r1
WORKSPACE .req r2
RECIPROCAL .req DIVISORS
CORRECTION .req r3
SHIFT .req ip
LOOP_COUNT .req r4
vld1.16 {d0, d1, d2, d3}, [WORKSPACE, :128]!
vabs.s16 q12, q0
add CORRECTION, DIVISORS, #(64 * 2)
add SHIFT, DIVISORS, #(64 * 6)
vld1.16 {d20, d21, d22, d23}, [CORRECTION, :128]!
vabs.s16 q13, q1
vld1.16 {d16, d17, d18, d19}, [RECIPROCAL, :128]!
vadd.u16 q12, q12, q10 /* add correction */
vadd.u16 q13, q13, q11
vmull.u16 q10, d24, d16 /* multiply by reciprocal */
vmull.u16 q11, d25, d17
vmull.u16 q8, d26, d18
vmull.u16 q9, d27, d19
vld1.16 {d24, d25, d26, d27}, [SHIFT, :128]!
vshrn.u32 d20, q10, #16
vshrn.u32 d21, q11, #16
vshrn.u32 d22, q8, #16
vshrn.u32 d23, q9, #16
vneg.s16 q12, q12
vneg.s16 q13, q13
vshr.s16 q2, q0, #15 /* extract sign */
vshr.s16 q3, q1, #15
vshl.u16 q14, q10, q12 /* shift */
vshl.u16 q15, q11, q13
push {r4, r5}
mov LOOP_COUNT, #3
1:
vld1.16 {d0, d1, d2, d3}, [WORKSPACE, :128]!
veor.u16 q14, q14, q2 /* restore sign */
vabs.s16 q12, q0
vld1.16 {d20, d21, d22, d23}, [CORRECTION, :128]!
vabs.s16 q13, q1
veor.u16 q15, q15, q3
vld1.16 {d16, d17, d18, d19}, [RECIPROCAL, :128]!
vadd.u16 q12, q12, q10 /* add correction */
vadd.u16 q13, q13, q11
vmull.u16 q10, d24, d16 /* multiply by reciprocal */
vmull.u16 q11, d25, d17
vmull.u16 q8, d26, d18
vmull.u16 q9, d27, d19
vsub.u16 q14, q14, q2
vld1.16 {d24, d25, d26, d27}, [SHIFT, :128]!
vsub.u16 q15, q15, q3
vshrn.u32 d20, q10, #16
vshrn.u32 d21, q11, #16
vst1.16 {d28, d29, d30, d31}, [COEF_BLOCK, :128]!
vshrn.u32 d22, q8, #16
vshrn.u32 d23, q9, #16
vneg.s16 q12, q12
vneg.s16 q13, q13
vshr.s16 q2, q0, #15 /* extract sign */
vshr.s16 q3, q1, #15
vshl.u16 q14, q10, q12 /* shift */
vshl.u16 q15, q11, q13
subs LOOP_COUNT, LOOP_COUNT, #1
bne 1b
pop {r4, r5}
veor.u16 q14, q14, q2 /* restore sign */
veor.u16 q15, q15, q3
vsub.u16 q14, q14, q2
vsub.u16 q15, q15, q3
vst1.16 {d28, d29, d30, d31}, [COEF_BLOCK, :128]!
bx lr /* return */
.unreq COEF_BLOCK
.unreq DIVISORS
.unreq WORKSPACE
.unreq RECIPROCAL
.unreq CORRECTION
.unreq SHIFT
.unreq LOOP_COUNT
/*****************************************************************************/
/*
* GLOBAL(void)
* jsimd_h2v1_fancy_upsample_neon (int max_v_samp_factor,
* JDIMENSION downsampled_width,
* JSAMPARRAY input_data,
* JSAMPARRAY * output_data_ptr);
*
* Note: the use of unaligned writes is the main remaining bottleneck in
* this code, which can be potentially solved to get up to tens
* of percents performance improvement on Cortex-A8/Cortex-A9.
*/
/*
* Upsample 16 source pixels to 32 destination pixels. The new 16 source
* pixels are loaded to q0. The previous 16 source pixels are in q1. The
* shifted-by-one source pixels are constructed in q2 by using q0 and q1.
* Register d28 is used for multiplication by 3. Register q15 is used
* for adding +1 bias.
*/
.macro upsample16 OUTPTR, INPTR
vld1.8 {q0}, [\INPTR]!
vmovl.u8 q8, d0
vext.8 q2, q1, q0, #15
vmovl.u8 q9, d1
vaddw.u8 q10, q15, d4
vaddw.u8 q11, q15, d5
vmlal.u8 q8, d4, d28
vmlal.u8 q9, d5, d28
vmlal.u8 q10, d0, d28
vmlal.u8 q11, d1, d28
vmov q1, q0 /* backup source pixels to q1 */
vrshrn.u16 d6, q8, #2
vrshrn.u16 d7, q9, #2
vshrn.u16 d8, q10, #2
vshrn.u16 d9, q11, #2
vst2.8 {d6, d7, d8, d9}, [\OUTPTR]!
.endm
/*
* Upsample 32 source pixels to 64 destination pixels. Compared to 'usample16'
* macro, the roles of q0 and q1 registers are reversed for even and odd
* groups of 16 pixels, that's why "vmov q1, q0" instructions are not needed.
* Also this unrolling allows to reorder loads and stores to compensate
* multiplication latency and reduce stalls.
*/
.macro upsample32 OUTPTR, INPTR
/* even 16 pixels group */
vld1.8 {q0}, [\INPTR]!
vmovl.u8 q8, d0
vext.8 q2, q1, q0, #15
vmovl.u8 q9, d1
vaddw.u8 q10, q15, d4
vaddw.u8 q11, q15, d5
vmlal.u8 q8, d4, d28
vmlal.u8 q9, d5, d28
vmlal.u8 q10, d0, d28
vmlal.u8 q11, d1, d28
/* odd 16 pixels group */
vld1.8 {q1}, [\INPTR]!
vrshrn.u16 d6, q8, #2
vrshrn.u16 d7, q9, #2
vshrn.u16 d8, q10, #2
vshrn.u16 d9, q11, #2
vmovl.u8 q8, d2
vext.8 q2, q0, q1, #15
vmovl.u8 q9, d3
vaddw.u8 q10, q15, d4
vaddw.u8 q11, q15, d5
vmlal.u8 q8, d4, d28
vmlal.u8 q9, d5, d28
vmlal.u8 q10, d2, d28
vmlal.u8 q11, d3, d28
vst2.8 {d6, d7, d8, d9}, [\OUTPTR]!
vrshrn.u16 d6, q8, #2
vrshrn.u16 d7, q9, #2
vshrn.u16 d8, q10, #2
vshrn.u16 d9, q11, #2
vst2.8 {d6, d7, d8, d9}, [\OUTPTR]!
.endm
/*
* Upsample a row of WIDTH pixels from INPTR to OUTPTR.
*/
.macro upsample_row OUTPTR, INPTR, WIDTH, TMP1
/* special case for the first and last pixels */
sub \WIDTH, \WIDTH, #1
add \OUTPTR, \OUTPTR, #1
ldrb \TMP1, [\INPTR, \WIDTH]
strb \TMP1, [\OUTPTR, \WIDTH, asl #1]
ldrb \TMP1, [\INPTR], #1
strb \TMP1, [\OUTPTR, #-1]
vmov.8 d3[7], \TMP1
subs \WIDTH, \WIDTH, #32
blt 5f
0: /* process 32 pixels per iteration */
upsample32 \OUTPTR, \INPTR
subs \WIDTH, \WIDTH, #32
bge 0b
5:
adds \WIDTH, \WIDTH, #16
blt 1f
0: /* process 16 pixels if needed */
upsample16 \OUTPTR, \INPTR
subs \WIDTH, \WIDTH, #16
1:
adds \WIDTH, \WIDTH, #16
beq 9f
/* load the remaining 1-15 pixels */
add \INPTR, \INPTR, \WIDTH
tst \WIDTH, #1
beq 2f
sub \INPTR, \INPTR, #1
vld1.8 {d0[0]}, [\INPTR]
2:
tst \WIDTH, #2
beq 2f
vext.8 d0, d0, d0, #6
sub \INPTR, \INPTR, #1
vld1.8 {d0[1]}, [\INPTR]
sub \INPTR, \INPTR, #1
vld1.8 {d0[0]}, [\INPTR]
2:
tst \WIDTH, #4
beq 2f
vrev64.32 d0, d0
sub \INPTR, \INPTR, #1
vld1.8 {d0[3]}, [\INPTR]
sub \INPTR, \INPTR, #1
vld1.8 {d0[2]}, [\INPTR]
sub \INPTR, \INPTR, #1
vld1.8 {d0[1]}, [\INPTR]
sub \INPTR, \INPTR, #1
vld1.8 {d0[0]}, [\INPTR]
2:
tst \WIDTH, #8
beq 2f
vmov d1, d0
sub \INPTR, \INPTR, #8
vld1.8 {d0}, [\INPTR]
2: /* upsample the remaining pixels */
vmovl.u8 q8, d0
vext.8 q2, q1, q0, #15
vmovl.u8 q9, d1
vaddw.u8 q10, q15, d4
vaddw.u8 q11, q15, d5
vmlal.u8 q8, d4, d28
vmlal.u8 q9, d5, d28
vmlal.u8 q10, d0, d28
vmlal.u8 q11, d1, d28
vrshrn.u16 d10, q8, #2
vrshrn.u16 d12, q9, #2
vshrn.u16 d11, q10, #2
vshrn.u16 d13, q11, #2
vzip.8 d10, d11
vzip.8 d12, d13
/* store the remaining pixels */
tst \WIDTH, #8
beq 2f
vst1.8 {d10, d11}, [\OUTPTR]!
vmov q5, q6
2:
tst \WIDTH, #4
beq 2f
vst1.8 {d10}, [\OUTPTR]!
vmov d10, d11
2:
tst \WIDTH, #2
beq 2f
vst1.8 {d10[0]}, [\OUTPTR]!
vst1.8 {d10[1]}, [\OUTPTR]!
vst1.8 {d10[2]}, [\OUTPTR]!
vst1.8 {d10[3]}, [\OUTPTR]!
vext.8 d10, d10, d10, #4
2:
tst \WIDTH, #1
beq 2f
vst1.8 {d10[0]}, [\OUTPTR]!
vst1.8 {d10[1]}, [\OUTPTR]!
2:
9:
.endm
asm_function jsimd_h2v1_fancy_upsample_neon
MAX_V_SAMP_FACTOR .req r0
DOWNSAMPLED_WIDTH .req r1
INPUT_DATA .req r2
OUTPUT_DATA_PTR .req r3
OUTPUT_DATA .req OUTPUT_DATA_PTR
OUTPTR .req r4
INPTR .req r5
WIDTH .req ip
TMP .req lr
push {r4, r5, r6, lr}
vpush {d8-d15}
ldr OUTPUT_DATA, [OUTPUT_DATA_PTR]
cmp MAX_V_SAMP_FACTOR, #0
ble 99f
/* initialize constants */
vmov.u8 d28, #3
vmov.u16 q15, #1
11:
ldr INPTR, [INPUT_DATA], #4
ldr OUTPTR, [OUTPUT_DATA], #4
mov WIDTH, DOWNSAMPLED_WIDTH
upsample_row OUTPTR, INPTR, WIDTH, TMP
subs MAX_V_SAMP_FACTOR, MAX_V_SAMP_FACTOR, #1
bgt 11b
99:
vpop {d8-d15}
pop {r4, r5, r6, pc}
.unreq MAX_V_SAMP_FACTOR
.unreq DOWNSAMPLED_WIDTH
.unreq INPUT_DATA
.unreq OUTPUT_DATA_PTR
.unreq OUTPUT_DATA
.unreq OUTPTR
.unreq INPTR
.unreq WIDTH
.unreq TMP
.purgem upsample16
.purgem upsample32
.purgem upsample_row