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/*
* ARM NEON optimizations for libjpeg-turbo
*
* Copyright (C) 2009-2011 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* Contact: Alexander Bokovoy <alexander.bokovoy@nokia.com>
*
* 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
/*****************************************************************************/
/* Supplementary macro for setting function attributes */
.macro asm_function fname
#ifdef __APPLE__
.func _\fname
.globl _\fname
_\fname:
#else
.func \fname
.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
/*****************************************************************************/
/*
* 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_fast'
* function from jidctfst.c
*
* TODO: a bit better instructions scheduling is needed.
*/
#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 */
/* 1-D IDCT helper macro */
.macro idct_helper x0, x1, x2, x3, x4, x5, x6, x7, \
t10, t11, t12, t13, t14
vsub.s16 \t10, \x0, \x4
vadd.s16 \x4, \x0, \x4
vswp.s16 \t10, \x0
vsub.s16 \t11, \x2, \x6
vadd.s16 \x6, \x2, \x6
vswp.s16 \t11, \x2
vsub.s16 \t10, \x3, \x5
vadd.s16 \x5, \x3, \x5
vswp.s16 \t10, \x3
vsub.s16 \t11, \x1, \x7
vadd.s16 \x7, \x1, \x7
vswp.s16 \t11, \x1
vqdmulh.s16 \t13, \x2, d0[1]
vadd.s16 \t12, \x3, \x3
vadd.s16 \x2, \x2, \t13
vqdmulh.s16 \t13, \x3, d0[3]
vsub.s16 \t10, \x1, \x3
vadd.s16 \t12, \t12, \t13
vqdmulh.s16 \t13, \t10, d0[2]
vsub.s16 \t11, \x7, \x5
vadd.s16 \t10, \t10, \t13
vqdmulh.s16 \t13, \t11, d0[1]
vadd.s16 \t11, \t11, \t13
vqdmulh.s16 \t13, \x1, d0[0]
vsub.s16 \x2, \x6, \x2
vsub.s16 \t14, \x0, \x2
vadd.s16 \x2, \x0, \x2
vadd.s16 \x0, \x4, \x6
vsub.s16 \x4, \x4, \x6
vadd.s16 \x1, \x1, \t13
vadd.s16 \t13, \x7, \x5
vsub.s16 \t12, \t13, \t12
vsub.s16 \t12, \t12, \t10
vadd.s16 \t11, \t12, \t11
vsub.s16 \t10, \x1, \t10
vadd.s16 \t10, \t10, \t11
vsub.s16 \x7, \x0, \t13
vadd.s16 \x0, \x0, \t13
vadd.s16 \x6, \t14, \t12
vsub.s16 \x1, \t14, \t12
vsub.s16 \x5, \x2, \t11
vadd.s16 \x2, \x2, \t11
vsub.s16 \x3, \x4, \t10
vadd.s16 \x4, \x4, \t10
.endm
asm_function jsimd_idct_ifast_neon
DCT_TABLE .req r0
COEF_BLOCK .req r1
OUTPUT_BUF .req r2
OUTPUT_COL .req r3
TMP .req ip
vpush {d8-d15}
/* Load constants */
adr TMP, jsimd_idct_ifast_neon_consts
vld1.16 {d0}, [TMP, :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 | d8 | d9
* 3 | d10 | d11
* 4 | d12 | d13
* 5 | d14 | d15
* 6 | d16 | d17
* 7 | d18 | d19
*/
vld1.16 {d4, d5, d6, d7}, [COEF_BLOCK]!
vld1.16 {d8, d9, d10, d11}, [COEF_BLOCK]!
vld1.16 {d12, d13, d14, d15}, [COEF_BLOCK]!
vld1.16 {d16, d17, d18, d19}, [COEF_BLOCK]!
/* Dequantize */
vld1.16 {d20, d21, d22, d23}, [DCT_TABLE]!
vmul.s16 q2, q2, q10
vld1.16 {d24, d25, d26, d27}, [DCT_TABLE]!
vmul.s16 q3, q3, q11
vmul.s16 q4, q4, q12
vld1.16 {d28, d29, d30, d31}, [DCT_TABLE]!
vmul.s16 q5, q5, q13
vmul.s16 q6, q6, q14
vld1.16 {d20, d21, d22, d23}, [DCT_TABLE]!
vmul.s16 q7, q7, q15
vmul.s16 q8, q8, q10
vmul.s16 q9, q9, q11
/* Pass 1 */
idct_helper q2, q3, q4, q5, q6, q7, q8, q9, q10, q11, q12, q13, q14
/* Transpose */
transpose_4x4 d4, d6, d8, d10
transpose_4x4 d5, d7, d9, d11
transpose_4x4 d12, d14, d16, d18
transpose_4x4 d13, d15, d17, d19
vswp d12, d5
vswp d14, d7
vswp d16, d9
vswp d18, d11
/* Pass 2 */
idct_helper q2, q3, q4, q5, q6, q7, q8, q9, q10, q11, q12, q13, q14
/* Transpose */
transpose_4x4 d4, d6, d8, d10
transpose_4x4 d5, d7, d9, d11
transpose_4x4 d12, d14, d16, d18
transpose_4x4 d13, d15, d17, d19
vswp d12, d5
vswp d14, d7
vswp d16, d9
vswp d18, d11
/* Descale and range limit */
vmov.s16 q15, #(0x80 << 5)
vqadd.s16 q2, q2, q15
vqadd.s16 q3, q3, q15
vqadd.s16 q4, q4, q15
vqadd.s16 q5, q5, q15
vqadd.s16 q6, q6, q15
vqadd.s16 q7, q7, q15
vqadd.s16 q8, q8, q15
vqadd.s16 q9, q9, q15
vqshrun.s16 d4, q2, #5
vqshrun.s16 d6, q3, #5
vqshrun.s16 d8, q4, #5
vqshrun.s16 d10, q5, #5
vqshrun.s16 d12, q6, #5
vqshrun.s16 d14, q7, #5
vqshrun.s16 d16, q8, #5
vqshrun.s16 d18, q9, #5
/* Store results to the output buffer */
.irp x, d4, d6, d8, d10, d12, d14, d16, d18
ldr TMP, [OUTPUT_BUF], #4
add TMP, TMP, OUTPUT_COL
vst1.8 {\x}, [TMP]!
.endr
vpop {d8-d15}
bx lr
.unreq DCT_TABLE
.unreq COEF_BLOCK
.unreq OUTPUT_BUF
.unreq OUTPUT_COL
.unreq TMP
.endfunc
.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]!
vld1.8 {d5}, [V]!
vld1.8 {d0}, [Y]!
pld [Y, #64]
pld [U, #64]
pld [V, #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
.else
.error unsupported bpp
.endif
.endm
.macro generate_jsimd_ycc_rgb_convert_neon colorid, bpp, r_offs, g_offs, b_offs
.macro do_yuv_to_rgb
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 */
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 q10, q10, d0
vaddw.u8 q12, q12, d0
vaddw.u8 q14, q14, d0
vqmovun.s16 d1\g_offs, q10
vqmovun.s16 d1\r_offs, q12
vqmovun.s16 d1\b_offs, q14
.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 2f
1:
do_load 8
do_yuv_to_rgb
do_store \bpp, 8
subs N, N, #8
bge 1b
tst N, #7
beq 8f
2:
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
.endfunc
.purgem do_yuv_to_rgb
.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
.purgem do_load
.purgem do_store
/*****************************************************************************/
|
