ref: 4bbd95512afa1f8e202f25ca111e42d97a2cd3cf
dir: /third_party/libyuv/source/scale_neon.cc/
/*
* Copyright 2011 The LibYuv 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.
*/
#include "libyuv/row.h"
#ifdef __cplusplus
namespace libyuv {
extern "C" {
#endif
// This module is for GCC Neon.
#if !defined(LIBYUV_DISABLE_NEON) && defined(__ARM_NEON__) && \
!defined(__aarch64__)
// NEON downscalers with interpolation.
// Provided by Fritz Koenig
// Read 32x1 throw away even pixels, and write 16x1.
void ScaleRowDown2_NEON(const uint8* src_ptr, ptrdiff_t src_stride,
uint8* dst, int dst_width) {
asm volatile (
".p2align 2 \n"
"1: \n"
// load even pixels into q0, odd into q1
MEMACCESS(0)
"vld2.8 {q0, q1}, [%0]! \n"
"subs %2, %2, #16 \n" // 16 processed per loop
MEMACCESS(1)
"vst1.8 {q1}, [%1]! \n" // store odd pixels
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst), // %1
"+r"(dst_width) // %2
:
: "q0", "q1" // Clobber List
);
}
// Read 32x2 average down and write 16x1.
void ScaleRowDown2Box_NEON(const uint8* src_ptr, ptrdiff_t src_stride,
uint8* dst, int dst_width) {
asm volatile (
// change the stride to row 2 pointer
"add %1, %0 \n"
".p2align 2 \n"
"1: \n"
MEMACCESS(0)
"vld1.8 {q0, q1}, [%0]! \n" // load row 1 and post inc
MEMACCESS(1)
"vld1.8 {q2, q3}, [%1]! \n" // load row 2 and post inc
"subs %3, %3, #16 \n" // 16 processed per loop
"vpaddl.u8 q0, q0 \n" // row 1 add adjacent
"vpaddl.u8 q1, q1 \n"
"vpadal.u8 q0, q2 \n" // row 2 add adjacent + row1
"vpadal.u8 q1, q3 \n"
"vrshrn.u16 d0, q0, #2 \n" // downshift, round and pack
"vrshrn.u16 d1, q1, #2 \n"
MEMACCESS(2)
"vst1.8 {q0}, [%2]! \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(src_stride), // %1
"+r"(dst), // %2
"+r"(dst_width) // %3
:
: "q0", "q1", "q2", "q3" // Clobber List
);
}
void ScaleRowDown4_NEON(const uint8* src_ptr, ptrdiff_t src_stride,
uint8* dst_ptr, int dst_width) {
asm volatile (
".p2align 2 \n"
"1: \n"
MEMACCESS(0)
"vld4.8 {d0, d1, d2, d3}, [%0]! \n" // src line 0
"subs %2, %2, #8 \n" // 8 processed per loop
MEMACCESS(1)
"vst1.8 {d2}, [%1]! \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
"+r"(dst_width) // %2
:
: "q0", "q1", "memory", "cc"
);
}
void ScaleRowDown4Box_NEON(const uint8* src_ptr, ptrdiff_t src_stride,
uint8* dst_ptr, int dst_width) {
const uint8* src_ptr1 = src_ptr + src_stride;
const uint8* src_ptr2 = src_ptr + src_stride * 2;
const uint8* src_ptr3 = src_ptr + src_stride * 3;
asm volatile (
".p2align 2 \n"
"1: \n"
MEMACCESS(0)
"vld1.8 {q0}, [%0]! \n" // load up 16x4
MEMACCESS(3)
"vld1.8 {q1}, [%3]! \n"
MEMACCESS(4)
"vld1.8 {q2}, [%4]! \n"
MEMACCESS(5)
"vld1.8 {q3}, [%5]! \n"
"subs %2, %2, #4 \n"
"vpaddl.u8 q0, q0 \n"
"vpadal.u8 q0, q1 \n"
"vpadal.u8 q0, q2 \n"
"vpadal.u8 q0, q3 \n"
"vpaddl.u16 q0, q0 \n"
"vrshrn.u32 d0, q0, #4 \n" // divide by 16 w/rounding
"vmovn.u16 d0, q0 \n"
MEMACCESS(1)
"vst1.32 {d0[0]}, [%1]! \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
"+r"(dst_width), // %2
"+r"(src_ptr1), // %3
"+r"(src_ptr2), // %4
"+r"(src_ptr3) // %5
:
: "q0", "q1", "q2", "q3", "memory", "cc"
);
}
// Down scale from 4 to 3 pixels. Use the neon multilane read/write
// to load up the every 4th pixel into a 4 different registers.
// Point samples 32 pixels to 24 pixels.
void ScaleRowDown34_NEON(const uint8* src_ptr,
ptrdiff_t src_stride,
uint8* dst_ptr, int dst_width) {
asm volatile (
".p2align 2 \n"
"1: \n"
MEMACCESS(0)
"vld4.8 {d0, d1, d2, d3}, [%0]! \n" // src line 0
"subs %2, %2, #24 \n"
"vmov d2, d3 \n" // order d0, d1, d2
MEMACCESS(1)
"vst3.8 {d0, d1, d2}, [%1]! \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
"+r"(dst_width) // %2
:
: "d0", "d1", "d2", "d3", "memory", "cc"
);
}
void ScaleRowDown34_0_Box_NEON(const uint8* src_ptr,
ptrdiff_t src_stride,
uint8* dst_ptr, int dst_width) {
asm volatile (
"vmov.u8 d24, #3 \n"
"add %3, %0 \n"
".p2align 2 \n"
"1: \n"
MEMACCESS(0)
"vld4.8 {d0, d1, d2, d3}, [%0]! \n" // src line 0
MEMACCESS(3)
"vld4.8 {d4, d5, d6, d7}, [%3]! \n" // src line 1
"subs %2, %2, #24 \n"
// filter src line 0 with src line 1
// expand chars to shorts to allow for room
// when adding lines together
"vmovl.u8 q8, d4 \n"
"vmovl.u8 q9, d5 \n"
"vmovl.u8 q10, d6 \n"
"vmovl.u8 q11, d7 \n"
// 3 * line_0 + line_1
"vmlal.u8 q8, d0, d24 \n"
"vmlal.u8 q9, d1, d24 \n"
"vmlal.u8 q10, d2, d24 \n"
"vmlal.u8 q11, d3, d24 \n"
// (3 * line_0 + line_1) >> 2
"vqrshrn.u16 d0, q8, #2 \n"
"vqrshrn.u16 d1, q9, #2 \n"
"vqrshrn.u16 d2, q10, #2 \n"
"vqrshrn.u16 d3, q11, #2 \n"
// a0 = (src[0] * 3 + s[1] * 1) >> 2
"vmovl.u8 q8, d1 \n"
"vmlal.u8 q8, d0, d24 \n"
"vqrshrn.u16 d0, q8, #2 \n"
// a1 = (src[1] * 1 + s[2] * 1) >> 1
"vrhadd.u8 d1, d1, d2 \n"
// a2 = (src[2] * 1 + s[3] * 3) >> 2
"vmovl.u8 q8, d2 \n"
"vmlal.u8 q8, d3, d24 \n"
"vqrshrn.u16 d2, q8, #2 \n"
MEMACCESS(1)
"vst3.8 {d0, d1, d2}, [%1]! \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
"+r"(dst_width), // %2
"+r"(src_stride) // %3
:
: "q0", "q1", "q2", "q3", "q8", "q9", "q10", "q11", "d24", "memory", "cc"
);
}
void ScaleRowDown34_1_Box_NEON(const uint8* src_ptr,
ptrdiff_t src_stride,
uint8* dst_ptr, int dst_width) {
asm volatile (
"vmov.u8 d24, #3 \n"
"add %3, %0 \n"
".p2align 2 \n"
"1: \n"
MEMACCESS(0)
"vld4.8 {d0, d1, d2, d3}, [%0]! \n" // src line 0
MEMACCESS(3)
"vld4.8 {d4, d5, d6, d7}, [%3]! \n" // src line 1
"subs %2, %2, #24 \n"
// average src line 0 with src line 1
"vrhadd.u8 q0, q0, q2 \n"
"vrhadd.u8 q1, q1, q3 \n"
// a0 = (src[0] * 3 + s[1] * 1) >> 2
"vmovl.u8 q3, d1 \n"
"vmlal.u8 q3, d0, d24 \n"
"vqrshrn.u16 d0, q3, #2 \n"
// a1 = (src[1] * 1 + s[2] * 1) >> 1
"vrhadd.u8 d1, d1, d2 \n"
// a2 = (src[2] * 1 + s[3] * 3) >> 2
"vmovl.u8 q3, d2 \n"
"vmlal.u8 q3, d3, d24 \n"
"vqrshrn.u16 d2, q3, #2 \n"
MEMACCESS(1)
"vst3.8 {d0, d1, d2}, [%1]! \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
"+r"(dst_width), // %2
"+r"(src_stride) // %3
:
: "r4", "q0", "q1", "q2", "q3", "d24", "memory", "cc"
);
}
#define HAS_SCALEROWDOWN38_NEON
static uvec8 kShuf38 =
{ 0, 3, 6, 8, 11, 14, 16, 19, 22, 24, 27, 30, 0, 0, 0, 0 };
static uvec8 kShuf38_2 =
{ 0, 8, 16, 2, 10, 17, 4, 12, 18, 6, 14, 19, 0, 0, 0, 0 };
static vec16 kMult38_Div6 =
{ 65536 / 12, 65536 / 12, 65536 / 12, 65536 / 12,
65536 / 12, 65536 / 12, 65536 / 12, 65536 / 12 };
static vec16 kMult38_Div9 =
{ 65536 / 18, 65536 / 18, 65536 / 18, 65536 / 18,
65536 / 18, 65536 / 18, 65536 / 18, 65536 / 18 };
// 32 -> 12
void ScaleRowDown38_NEON(const uint8* src_ptr,
ptrdiff_t src_stride,
uint8* dst_ptr, int dst_width) {
asm volatile (
MEMACCESS(3)
"vld1.8 {q3}, [%3] \n"
".p2align 2 \n"
"1: \n"
MEMACCESS(0)
"vld1.8 {d0, d1, d2, d3}, [%0]! \n"
"subs %2, %2, #12 \n"
"vtbl.u8 d4, {d0, d1, d2, d3}, d6 \n"
"vtbl.u8 d5, {d0, d1, d2, d3}, d7 \n"
MEMACCESS(1)
"vst1.8 {d4}, [%1]! \n"
MEMACCESS(1)
"vst1.32 {d5[0]}, [%1]! \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
"+r"(dst_width) // %2
: "r"(&kShuf38) // %3
: "d0", "d1", "d2", "d3", "d4", "d5", "memory", "cc"
);
}
// 32x3 -> 12x1
void OMITFP ScaleRowDown38_3_Box_NEON(const uint8* src_ptr,
ptrdiff_t src_stride,
uint8* dst_ptr, int dst_width) {
const uint8* src_ptr1 = src_ptr + src_stride * 2;
asm volatile (
MEMACCESS(5)
"vld1.16 {q13}, [%5] \n"
MEMACCESS(6)
"vld1.8 {q14}, [%6] \n"
MEMACCESS(7)
"vld1.8 {q15}, [%7] \n"
"add %3, %0 \n"
".p2align 2 \n"
"1: \n"
// d0 = 00 40 01 41 02 42 03 43
// d1 = 10 50 11 51 12 52 13 53
// d2 = 20 60 21 61 22 62 23 63
// d3 = 30 70 31 71 32 72 33 73
MEMACCESS(0)
"vld4.8 {d0, d1, d2, d3}, [%0]! \n"
MEMACCESS(3)
"vld4.8 {d4, d5, d6, d7}, [%3]! \n"
MEMACCESS(4)
"vld4.8 {d16, d17, d18, d19}, [%4]! \n"
"subs %2, %2, #12 \n"
// Shuffle the input data around to get align the data
// so adjacent data can be added. 0,1 - 2,3 - 4,5 - 6,7
// d0 = 00 10 01 11 02 12 03 13
// d1 = 40 50 41 51 42 52 43 53
"vtrn.u8 d0, d1 \n"
"vtrn.u8 d4, d5 \n"
"vtrn.u8 d16, d17 \n"
// d2 = 20 30 21 31 22 32 23 33
// d3 = 60 70 61 71 62 72 63 73
"vtrn.u8 d2, d3 \n"
"vtrn.u8 d6, d7 \n"
"vtrn.u8 d18, d19 \n"
// d0 = 00+10 01+11 02+12 03+13
// d2 = 40+50 41+51 42+52 43+53
"vpaddl.u8 q0, q0 \n"
"vpaddl.u8 q2, q2 \n"
"vpaddl.u8 q8, q8 \n"
// d3 = 60+70 61+71 62+72 63+73
"vpaddl.u8 d3, d3 \n"
"vpaddl.u8 d7, d7 \n"
"vpaddl.u8 d19, d19 \n"
// combine source lines
"vadd.u16 q0, q2 \n"
"vadd.u16 q0, q8 \n"
"vadd.u16 d4, d3, d7 \n"
"vadd.u16 d4, d19 \n"
// dst_ptr[3] = (s[6 + st * 0] + s[7 + st * 0]
// + s[6 + st * 1] + s[7 + st * 1]
// + s[6 + st * 2] + s[7 + st * 2]) / 6
"vqrdmulh.s16 q2, q2, q13 \n"
"vmovn.u16 d4, q2 \n"
// Shuffle 2,3 reg around so that 2 can be added to the
// 0,1 reg and 3 can be added to the 4,5 reg. This
// requires expanding from u8 to u16 as the 0,1 and 4,5
// registers are already expanded. Then do transposes
// to get aligned.
// q2 = xx 20 xx 30 xx 21 xx 31 xx 22 xx 32 xx 23 xx 33
"vmovl.u8 q1, d2 \n"
"vmovl.u8 q3, d6 \n"
"vmovl.u8 q9, d18 \n"
// combine source lines
"vadd.u16 q1, q3 \n"
"vadd.u16 q1, q9 \n"
// d4 = xx 20 xx 30 xx 22 xx 32
// d5 = xx 21 xx 31 xx 23 xx 33
"vtrn.u32 d2, d3 \n"
// d4 = xx 20 xx 21 xx 22 xx 23
// d5 = xx 30 xx 31 xx 32 xx 33
"vtrn.u16 d2, d3 \n"
// 0+1+2, 3+4+5
"vadd.u16 q0, q1 \n"
// Need to divide, but can't downshift as the the value
// isn't a power of 2. So multiply by 65536 / n
// and take the upper 16 bits.
"vqrdmulh.s16 q0, q0, q15 \n"
// Align for table lookup, vtbl requires registers to
// be adjacent
"vmov.u8 d2, d4 \n"
"vtbl.u8 d3, {d0, d1, d2}, d28 \n"
"vtbl.u8 d4, {d0, d1, d2}, d29 \n"
MEMACCESS(1)
"vst1.8 {d3}, [%1]! \n"
MEMACCESS(1)
"vst1.32 {d4[0]}, [%1]! \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
"+r"(dst_width), // %2
"+r"(src_stride), // %3
"+r"(src_ptr1) // %4
: "r"(&kMult38_Div6), // %5
"r"(&kShuf38_2), // %6
"r"(&kMult38_Div9) // %7
: "q0", "q1", "q2", "q3", "q8", "q9", "q13", "q14", "q15", "memory", "cc"
);
}
// 32x2 -> 12x1
void ScaleRowDown38_2_Box_NEON(const uint8* src_ptr,
ptrdiff_t src_stride,
uint8* dst_ptr, int dst_width) {
asm volatile (
MEMACCESS(4)
"vld1.16 {q13}, [%4] \n"
MEMACCESS(5)
"vld1.8 {q14}, [%5] \n"
"add %3, %0 \n"
".p2align 2 \n"
"1: \n"
// d0 = 00 40 01 41 02 42 03 43
// d1 = 10 50 11 51 12 52 13 53
// d2 = 20 60 21 61 22 62 23 63
// d3 = 30 70 31 71 32 72 33 73
MEMACCESS(0)
"vld4.8 {d0, d1, d2, d3}, [%0]! \n"
MEMACCESS(3)
"vld4.8 {d4, d5, d6, d7}, [%3]! \n"
"subs %2, %2, #12 \n"
// Shuffle the input data around to get align the data
// so adjacent data can be added. 0,1 - 2,3 - 4,5 - 6,7
// d0 = 00 10 01 11 02 12 03 13
// d1 = 40 50 41 51 42 52 43 53
"vtrn.u8 d0, d1 \n"
"vtrn.u8 d4, d5 \n"
// d2 = 20 30 21 31 22 32 23 33
// d3 = 60 70 61 71 62 72 63 73
"vtrn.u8 d2, d3 \n"
"vtrn.u8 d6, d7 \n"
// d0 = 00+10 01+11 02+12 03+13
// d2 = 40+50 41+51 42+52 43+53
"vpaddl.u8 q0, q0 \n"
"vpaddl.u8 q2, q2 \n"
// d3 = 60+70 61+71 62+72 63+73
"vpaddl.u8 d3, d3 \n"
"vpaddl.u8 d7, d7 \n"
// combine source lines
"vadd.u16 q0, q2 \n"
"vadd.u16 d4, d3, d7 \n"
// dst_ptr[3] = (s[6] + s[7] + s[6+st] + s[7+st]) / 4
"vqrshrn.u16 d4, q2, #2 \n"
// Shuffle 2,3 reg around so that 2 can be added to the
// 0,1 reg and 3 can be added to the 4,5 reg. This
// requires expanding from u8 to u16 as the 0,1 and 4,5
// registers are already expanded. Then do transposes
// to get aligned.
// q2 = xx 20 xx 30 xx 21 xx 31 xx 22 xx 32 xx 23 xx 33
"vmovl.u8 q1, d2 \n"
"vmovl.u8 q3, d6 \n"
// combine source lines
"vadd.u16 q1, q3 \n"
// d4 = xx 20 xx 30 xx 22 xx 32
// d5 = xx 21 xx 31 xx 23 xx 33
"vtrn.u32 d2, d3 \n"
// d4 = xx 20 xx 21 xx 22 xx 23
// d5 = xx 30 xx 31 xx 32 xx 33
"vtrn.u16 d2, d3 \n"
// 0+1+2, 3+4+5
"vadd.u16 q0, q1 \n"
// Need to divide, but can't downshift as the the value
// isn't a power of 2. So multiply by 65536 / n
// and take the upper 16 bits.
"vqrdmulh.s16 q0, q0, q13 \n"
// Align for table lookup, vtbl requires registers to
// be adjacent
"vmov.u8 d2, d4 \n"
"vtbl.u8 d3, {d0, d1, d2}, d28 \n"
"vtbl.u8 d4, {d0, d1, d2}, d29 \n"
MEMACCESS(1)
"vst1.8 {d3}, [%1]! \n"
MEMACCESS(1)
"vst1.32 {d4[0]}, [%1]! \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
"+r"(dst_width), // %2
"+r"(src_stride) // %3
: "r"(&kMult38_Div6), // %4
"r"(&kShuf38_2) // %5
: "q0", "q1", "q2", "q3", "q13", "q14", "memory", "cc"
);
}
// 16x2 -> 16x1
void ScaleFilterRows_NEON(uint8* dst_ptr,
const uint8* src_ptr, ptrdiff_t src_stride,
int dst_width, int source_y_fraction) {
asm volatile (
"cmp %4, #0 \n"
"beq 100f \n"
"add %2, %1 \n"
"cmp %4, #64 \n"
"beq 75f \n"
"cmp %4, #128 \n"
"beq 50f \n"
"cmp %4, #192 \n"
"beq 25f \n"
"vdup.8 d5, %4 \n"
"rsb %4, #256 \n"
"vdup.8 d4, %4 \n"
// General purpose row blend.
"1: \n"
MEMACCESS(1)
"vld1.8 {q0}, [%1]! \n"
MEMACCESS(2)
"vld1.8 {q1}, [%2]! \n"
"subs %3, %3, #16 \n"
"vmull.u8 q13, d0, d4 \n"
"vmull.u8 q14, d1, d4 \n"
"vmlal.u8 q13, d2, d5 \n"
"vmlal.u8 q14, d3, d5 \n"
"vrshrn.u16 d0, q13, #8 \n"
"vrshrn.u16 d1, q14, #8 \n"
MEMACCESS(0)
"vst1.8 {q0}, [%0]! \n"
"bgt 1b \n"
"b 99f \n"
// Blend 25 / 75.
"25: \n"
MEMACCESS(1)
"vld1.8 {q0}, [%1]! \n"
MEMACCESS(2)
"vld1.8 {q1}, [%2]! \n"
"subs %3, %3, #16 \n"
"vrhadd.u8 q0, q1 \n"
"vrhadd.u8 q0, q1 \n"
MEMACCESS(0)
"vst1.8 {q0}, [%0]! \n"
"bgt 25b \n"
"b 99f \n"
// Blend 50 / 50.
"50: \n"
MEMACCESS(1)
"vld1.8 {q0}, [%1]! \n"
MEMACCESS(2)
"vld1.8 {q1}, [%2]! \n"
"subs %3, %3, #16 \n"
"vrhadd.u8 q0, q1 \n"
MEMACCESS(0)
"vst1.8 {q0}, [%0]! \n"
"bgt 50b \n"
"b 99f \n"
// Blend 75 / 25.
"75: \n"
MEMACCESS(1)
"vld1.8 {q1}, [%1]! \n"
MEMACCESS(2)
"vld1.8 {q0}, [%2]! \n"
"subs %3, %3, #16 \n"
"vrhadd.u8 q0, q1 \n"
"vrhadd.u8 q0, q1 \n"
MEMACCESS(0)
"vst1.8 {q0}, [%0]! \n"
"bgt 75b \n"
"b 99f \n"
// Blend 100 / 0 - Copy row unchanged.
"100: \n"
MEMACCESS(1)
"vld1.8 {q0}, [%1]! \n"
"subs %3, %3, #16 \n"
MEMACCESS(0)
"vst1.8 {q0}, [%0]! \n"
"bgt 100b \n"
"99: \n"
MEMACCESS(0)
"vst1.8 {d1[7]}, [%0] \n"
: "+r"(dst_ptr), // %0
"+r"(src_ptr), // %1
"+r"(src_stride), // %2
"+r"(dst_width), // %3
"+r"(source_y_fraction) // %4
:
: "q0", "q1", "d4", "d5", "q13", "q14", "memory", "cc"
);
}
void ScaleARGBRowDown2_NEON(const uint8* src_ptr, ptrdiff_t src_stride,
uint8* dst, int dst_width) {
asm volatile (
".p2align 2 \n"
"1: \n"
// load even pixels into q0, odd into q1
MEMACCESS(0)
"vld2.32 {q0, q1}, [%0]! \n"
MEMACCESS(0)
"vld2.32 {q2, q3}, [%0]! \n"
"subs %2, %2, #8 \n" // 8 processed per loop
MEMACCESS(1)
"vst1.8 {q1}, [%1]! \n" // store odd pixels
MEMACCESS(1)
"vst1.8 {q3}, [%1]! \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst), // %1
"+r"(dst_width) // %2
:
: "memory", "cc", "q0", "q1", "q2", "q3" // Clobber List
);
}
void ScaleARGBRowDown2Box_NEON(const uint8* src_ptr, ptrdiff_t src_stride,
uint8* dst, int dst_width) {
asm volatile (
// change the stride to row 2 pointer
"add %1, %1, %0 \n"
".p2align 2 \n"
"1: \n"
MEMACCESS(0)
"vld4.8 {d0, d2, d4, d6}, [%0]! \n" // load 8 ARGB pixels.
MEMACCESS(0)
"vld4.8 {d1, d3, d5, d7}, [%0]! \n" // load next 8 ARGB pixels.
"subs %3, %3, #8 \n" // 8 processed per loop.
"vpaddl.u8 q0, q0 \n" // B 16 bytes -> 8 shorts.
"vpaddl.u8 q1, q1 \n" // G 16 bytes -> 8 shorts.
"vpaddl.u8 q2, q2 \n" // R 16 bytes -> 8 shorts.
"vpaddl.u8 q3, q3 \n" // A 16 bytes -> 8 shorts.
MEMACCESS(1)
"vld4.8 {d16, d18, d20, d22}, [%1]! \n" // load 8 more ARGB pixels.
MEMACCESS(1)
"vld4.8 {d17, d19, d21, d23}, [%1]! \n" // load last 8 ARGB pixels.
"vpadal.u8 q0, q8 \n" // B 16 bytes -> 8 shorts.
"vpadal.u8 q1, q9 \n" // G 16 bytes -> 8 shorts.
"vpadal.u8 q2, q10 \n" // R 16 bytes -> 8 shorts.
"vpadal.u8 q3, q11 \n" // A 16 bytes -> 8 shorts.
"vrshrn.u16 d0, q0, #2 \n" // downshift, round and pack
"vrshrn.u16 d1, q1, #2 \n"
"vrshrn.u16 d2, q2, #2 \n"
"vrshrn.u16 d3, q3, #2 \n"
MEMACCESS(2)
"vst4.8 {d0, d1, d2, d3}, [%2]! \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(src_stride), // %1
"+r"(dst), // %2
"+r"(dst_width) // %3
:
: "memory", "cc", "q0", "q1", "q2", "q3", "q8", "q9", "q10", "q11"
);
}
// Reads 4 pixels at a time.
// Alignment requirement: src_argb 4 byte aligned.
void ScaleARGBRowDownEven_NEON(const uint8* src_argb, ptrdiff_t src_stride,
int src_stepx, uint8* dst_argb, int dst_width) {
asm volatile (
"mov r12, %3, lsl #2 \n"
".p2align 2 \n"
"1: \n"
MEMACCESS(0)
"vld1.32 {d0[0]}, [%0], r12 \n"
MEMACCESS(0)
"vld1.32 {d0[1]}, [%0], r12 \n"
MEMACCESS(0)
"vld1.32 {d1[0]}, [%0], r12 \n"
MEMACCESS(0)
"vld1.32 {d1[1]}, [%0], r12 \n"
"subs %2, %2, #4 \n" // 4 pixels per loop.
MEMACCESS(1)
"vst1.8 {q0}, [%1]! \n"
"bgt 1b \n"
: "+r"(src_argb), // %0
"+r"(dst_argb), // %1
"+r"(dst_width) // %2
: "r"(src_stepx) // %3
: "memory", "cc", "r12", "q0"
);
}
// Reads 4 pixels at a time.
// Alignment requirement: src_argb 4 byte aligned.
void ScaleARGBRowDownEvenBox_NEON(const uint8* src_argb, ptrdiff_t src_stride,
int src_stepx,
uint8* dst_argb, int dst_width) {
asm volatile (
"mov r12, %4, lsl #2 \n"
"add %1, %1, %0 \n"
".p2align 2 \n"
"1: \n"
MEMACCESS(0)
"vld1.8 {d0}, [%0], r12 \n" // Read 4 2x2 blocks -> 2x1
MEMACCESS(1)
"vld1.8 {d1}, [%1], r12 \n"
MEMACCESS(0)
"vld1.8 {d2}, [%0], r12 \n"
MEMACCESS(1)
"vld1.8 {d3}, [%1], r12 \n"
MEMACCESS(0)
"vld1.8 {d4}, [%0], r12 \n"
MEMACCESS(1)
"vld1.8 {d5}, [%1], r12 \n"
MEMACCESS(0)
"vld1.8 {d6}, [%0], r12 \n"
MEMACCESS(1)
"vld1.8 {d7}, [%1], r12 \n"
"vaddl.u8 q0, d0, d1 \n"
"vaddl.u8 q1, d2, d3 \n"
"vaddl.u8 q2, d4, d5 \n"
"vaddl.u8 q3, d6, d7 \n"
"vswp.8 d1, d2 \n" // ab_cd -> ac_bd
"vswp.8 d5, d6 \n" // ef_gh -> eg_fh
"vadd.u16 q0, q0, q1 \n" // (a+b)_(c+d)
"vadd.u16 q2, q2, q3 \n" // (e+f)_(g+h)
"vrshrn.u16 d0, q0, #2 \n" // first 2 pixels.
"vrshrn.u16 d1, q2, #2 \n" // next 2 pixels.
"subs %3, %3, #4 \n" // 4 pixels per loop.
MEMACCESS(2)
"vst1.8 {q0}, [%2]! \n"
"bgt 1b \n"
: "+r"(src_argb), // %0
"+r"(src_stride), // %1
"+r"(dst_argb), // %2
"+r"(dst_width) // %3
: "r"(src_stepx) // %4
: "memory", "cc", "r12", "q0", "q1", "q2", "q3"
);
}
#endif // defined(__ARM_NEON__) && !defined(__aarch64__)
#ifdef __cplusplus
} // extern "C"
} // namespace libyuv
#endif