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|
/*
* Copyright 2014 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(__aarch64__)
#ifdef HAS_SCALEROWDOWN2_NEON
// 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 (
"1: \n"
// load even pixels into v0, odd into v1
MEMACCESS(0)
"ld2 {v0.16b, v1.16b}, [%0], #32 \n"
"subs %2, %2, #16 \n" // 16 processed per loop
MEMACCESS(1)
"st1 {v1.16b}, [%1], #16 \n" // store odd pixels
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst), // %1
"+r"(dst_width) // %2
:
: "v0", "v1" // Clobber List
);
}
#endif //HAS_SCALEROWDOWN2_NEON
#ifdef HAS_SCALEROWDOWN2_NEON
// 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, %1, %0 \n"
"1: \n"
MEMACCESS(0)
"ld1 {v0.16b, v1.16b}, [%0], #32 \n" // load row 1 and post inc
MEMACCESS(1)
"ld1 {v2.16b, v3.16b}, [%1], #32 \n" // load row 2 and post inc
"subs %3, %3, #16 \n" // 16 processed per loop
"uaddlp v0.8h, v0.16b \n" // row 1 add adjacent
"uaddlp v1.8h, v1.16b \n"
"uadalp v0.8h, v2.16b \n" // row 2 add adjacent + row1
"uadalp v1.8h, v3.16b \n"
"rshrn v0.8b, v0.8h, #2 \n" // downshift, round and pack
"rshrn2 v0.16b, v1.8h, #2 \n"
MEMACCESS(2)
"st1 {v0.16b}, [%2], #16 \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(src_stride), // %1
"+r"(dst), // %2
"+r"(dst_width) // %3
:
: "v0", "v1", "v2", "v3" // Clobber List
);
}
#endif //HAS_SCALEROWDOWN2_NEON
#ifdef HAS_SCALEROWDOWN4_NEON
void ScaleRowDown4_NEON(const uint8* src_ptr, ptrdiff_t src_stride,
uint8* dst_ptr, int dst_width) {
asm volatile (
"1: \n"
MEMACCESS(0)
"ld4 {v0.8b-3.8b}, [%0], #32 \n" // src line 0
"subs %2, %2, #8 \n" // 8 processed per loop
MEMACCESS(1)
"st1 {v2.8b}, [%1], #8 \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
"+r"(dst_width) // %2
:
: "v0", "v1", "v2", "v3", "memory", "cc"
);
}
#endif //HAS_SCALEROWDOWN4_NEON
#ifdef HAS_SCALEROWDOWN4_NEON
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 (
"1: \n"
MEMACCESS(0)
"ld1 {v0.16b}, [%0], #16 \n" // load up 16x4
MEMACCESS(3)
"ld1 {v1.16b}, [%3], #16 \n"
MEMACCESS(4)
"ld1 {v2.16b}, [%4], #16 \n"
MEMACCESS(5)
"ld1 {v3.16b}, [%5], #16 \n"
"subs %2, %2, #4 \n"
"uaddlp v0.8h, v0.16b \n"
"uadalp v0.8h, v1.16b \n"
"uadalp v0.8h, v2.16b \n"
"uadalp v0.8h, v3.16b \n"
"addp v0.8h, v0.8h, v0.8h \n"
"rshrn v0.8b, v0.8h, #4 \n" // divide by 16 w/rounding
MEMACCESS(1)
"st1 {v0.s}[0], [%1], #4 \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
:
: "v0", "v1", "v2", "v3", "memory", "cc"
);
}
#endif //HAS_SCALEROWDOWN4_NEON
#ifdef HAS_SCALEROWDOWN34_NEON
// 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 (
"1: \n"
MEMACCESS(0)
"ld4 {v0.8b-v3.8b}, [%0], #32 \n" // src line 0
"subs %2, %2, #24 \n"
"mov v2.8b, v3.8b \n" // order v0, v1, v2
MEMACCESS(1)
"st3 {v0.8b-v2.8b}, [%1], #24 \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
"+r"(dst_width) // %2
:
: "v0", "v1", "v2", "v3", "memory", "cc"
);
}
#endif //HAS_SCALEROWDOWN34_NEON
#ifdef HAS_SCALEROWDOWN34_NEON
void ScaleRowDown34_0_Box_NEON(const uint8* src_ptr,
ptrdiff_t src_stride,
uint8* dst_ptr, int dst_width) {
asm volatile (
"movi v20.8b, #3 \n"
"add %3, %3, %0 \n"
"1: \n"
MEMACCESS(0)
"ld4 {v0.8b-v3.8b}, [%0], #32 \n" // src line 0
MEMACCESS(3)
"ld4 {v4.8b-v7.8b}, [%3], #32 \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
"ushll v16.8h, v4.8b, #0 \n"
"ushll v17.8h, v5.8b, #0 \n"
"ushll v18.8h, v6.8b, #0 \n"
"ushll v19.8h, v7.8b, #0 \n"
// 3 * line_0 + line_1
"umlal v16.8h, v0.8b, v20.8b \n"
"umlal v17.8h, v1.8b, v20.8b \n"
"umlal v18.8h, v2.8b, v20.8b \n"
"umlal v19.8h, v3.8b, v20.8b \n"
// (3 * line_0 + line_1) >> 2
"uqrshrn v0.8b, v16.8h, #2 \n"
"uqrshrn v1.8b, v17.8h, #2 \n"
"uqrshrn v2.8b, v18.8h, #2 \n"
"uqrshrn v3.8b, v19.8h, #2 \n"
// a0 = (src[0] * 3 + s[1] * 1) >> 2
"ushll v16.8h, v1.8b, #0 \n"
"umlal v16.8h, v0.8b, v20.8b \n"
"uqrshrn v0.8b, v16.8h, #2 \n"
// a1 = (src[1] * 1 + s[2] * 1) >> 1
"urhadd v1.8b, v1.8b, v2.8b \n"
// a2 = (src[2] * 1 + s[3] * 3) >> 2
"ushll v16.8h, v2.8b, #0 \n"
"umlal v16.8h, v3.8b, v20.8b \n"
"uqrshrn v2.8b, v16.8h, #2 \n"
MEMACCESS(1)
"st3 {v0.8b-v2.8b}, [%1], #24 \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
"+r"(dst_width), // %2
"+r"(src_stride) // %3
:
: "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v16", "v17", "v18", "v19",
"v20", "memory", "cc"
);
}
#endif //ScaleRowDown34_0_Box_NEON
#ifdef HAS_SCALEROWDOWN34_NEON
void ScaleRowDown34_1_Box_NEON(const uint8* src_ptr,
ptrdiff_t src_stride,
uint8* dst_ptr, int dst_width) {
asm volatile (
"movi v20.8b, #3 \n"
"add %3, %3, %0 \n"
"1: \n"
MEMACCESS(0)
"ld4 {v0.8b-v3.8b}, [%0], #32 \n" // src line 0
MEMACCESS(3)
"ld4 {v4.8b-v7.8b}, [%3], #32 \n" // src line 1
"subs %2, %2, #24 \n"
// average src line 0 with src line 1
"urhadd v0.8b, v0.8b, v4.8b \n"
"urhadd v1.8b, v1.8b, v5.8b \n"
"urhadd v2.8b, v2.8b, v6.8b \n"
"urhadd v3.8b, v3.8b, v7.8b \n"
// a0 = (src[0] * 3 + s[1] * 1) >> 2
"ushll v4.8h, v1.8b, #0 \n"
"umlal v4.8h, v0.8b, v20.8b \n"
"uqrshrn v0.8b, v4.8h, #2 \n"
// a1 = (src[1] * 1 + s[2] * 1) >> 1
"urhadd v1.8b, v1.8b, v2.8b \n"
// a2 = (src[2] * 1 + s[3] * 3) >> 2
"ushll v4.8h, v2.8b, #0 \n"
"umlal v4.8h, v3.8b, v20.8b \n"
"uqrshrn v2.8b, v4.8h, #2 \n"
MEMACCESS(1)
"st3 {v0.8b-v2.8b}, [%1], #24 \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
"+r"(dst_width), // %2
"+r"(src_stride) // %3
:
: "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v20", "memory", "cc"
);
}
#endif //HAS_SCALEROWDOWN34_NEON
#ifdef 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, 16, 32, 2, 18, 33, 4, 20, 34, 6, 22, 35, 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)
"ld1 {v3.16b}, [%3] \n"
"1: \n"
MEMACCESS(0)
"ld1 {v0.16b, v1.16b}, [%0], #32 \n"
"subs %2, %2, #12 \n"
"tbl v2.16b, {v0.16b, v1.16b}, v3.16b \n"
MEMACCESS(1)
"st1 {v2.8b}, [%1], #8 \n"
MEMACCESS(1)
"st1 {v2.s}[2], [%1], #4 \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
"+r"(dst_width) // %2
: "r"(&kShuf38) // %3
: "v0", "v1", "v2", "v3", "memory", "cc"
);
}
#endif //HAS_SCALEROWDOWN38_NEON
#ifdef HAS_SCALEROWDOWN38_NEON
// 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)
"ld1 {v29.8h}, [%5] \n"
MEMACCESS(6)
"ld1 {v30.16b}, [%6] \n"
MEMACCESS(7)
"ld1 {v31.8h}, [%7] \n"
"add %3, %3, %0 \n"
"1: \n"
// 00 40 01 41 02 42 03 43
// 10 50 11 51 12 52 13 53
// 20 60 21 61 22 62 23 63
// 30 70 31 71 32 72 33 73
MEMACCESS(0)
"ld4 {v0.8b-v3.8b}, [%0], #32 \n"
MEMACCESS(3)
"ld4 {v4.8b-v7.8b}, [%3], #32 \n"
MEMACCESS(4)
"ld4 {v16.8b-v19.8b}, [%4], #32 \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
// 00 10 01 11 02 12 03 13
// 40 50 41 51 42 52 43 53
"trn1 v20.8b, v0.8b, v1.8b \n"
"trn2 v21.8b, v0.8b, v1.8b \n"
"trn1 v22.8b, v4.8b, v5.8b \n"
"trn2 v23.8b, v4.8b, v5.8b \n"
"trn1 v24.8b, v16.8b, v17.8b \n"
"trn2 v25.8b, v16.8b, v17.8b \n"
// 20 30 21 31 22 32 23 33
// 60 70 61 71 62 72 63 73
"trn1 v0.8b, v2.8b, v3.8b \n"
"trn2 v1.8b, v2.8b, v3.8b \n"
"trn1 v4.8b, v6.8b, v7.8b \n"
"trn2 v5.8b, v6.8b, v7.8b \n"
"trn1 v16.8b, v18.8b, v19.8b \n"
"trn2 v17.8b, v18.8b, v19.8b \n"
// 00+10 01+11 02+12 03+13
// 40+50 41+51 42+52 43+53
"uaddlp v20.4h, v20.8b \n"
"uaddlp v21.4h, v21.8b \n"
"uaddlp v22.4h, v22.8b \n"
"uaddlp v23.4h, v23.8b \n"
"uaddlp v24.4h, v24.8b \n"
"uaddlp v25.4h, v25.8b \n"
// 60+70 61+71 62+72 63+73
"uaddlp v1.4h, v1.8b \n"
"uaddlp v5.4h, v5.8b \n"
"uaddlp v17.4h, v17.8b \n"
// combine source lines
"add v20.4h, v20.4h, v22.4h \n"
"add v21.4h, v21.4h, v23.4h \n"
"add v20.4h, v20.4h, v24.4h \n"
"add v21.4h, v21.4h, v25.4h \n"
"add v2.4h, v1.4h, v5.4h \n"
"add v2.4h, v2.4h, v17.4h \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
"sqrdmulh v2.8h, v2.8h, v29.8h \n"
"xtn v2.8b, v2.8h \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.
// xx 20 xx 30 xx 21 xx 31 xx 22 xx 32 xx 23 xx 33
"ushll v16.8h, v16.8b, #0 \n"
"uaddl v0.8h, v0.8b, v4.8b \n"
// combine source lines
"add v0.8h, v0.8h, v16.8h \n"
// xx 20 xx 21 xx 22 xx 23
// xx 30 xx 31 xx 32 xx 33
"trn1 v1.8h, v0.8h, v0.8h \n"
"trn2 v4.8h, v0.8h, v0.8h \n"
"xtn v0.4h, v1.4s \n"
"xtn v4.4h, v4.4s \n"
// 0+1+2, 3+4+5
"add v20.8h, v20.8h, v0.8h \n"
"add v21.8h, v21.8h, v4.8h \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.
"sqrdmulh v0.8h, v20.8h, v31.8h \n"
"sqrdmulh v1.8h, v21.8h, v31.8h \n"
// Align for table lookup, vtbl requires registers to
// be adjacent
"tbl v3.16b, {v0.16b, v1.16b, v2.16b}, v30.16b \n"
MEMACCESS(1)
"st1 {v3.8b}, [%1], #8 \n"
MEMACCESS(1)
"st1 {v3.s}[2], [%1], #4 \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
: "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v16", "v17",
"v18", "v19", "v20", "v21", "v22", "v23", "v24", "v25", "v29",
"v30", "v31", "memory", "cc"
);
}
#endif //HAS_SCALEROWDOWN38_NEON
#ifdef HAS_SCALEROWDOWN38_NEON
// 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)
"ld1 {v30.8h}, [%4] \n"
MEMACCESS(5)
"ld1 {v31.16b}, [%5] \n"
"add %3, %3, %0 \n"
"1: \n"
// 00 40 01 41 02 42 03 43
// 10 50 11 51 12 52 13 53
// 20 60 21 61 22 62 23 63
// 30 70 31 71 32 72 33 73
MEMACCESS(0)
"ld4 {v0.8b-v3.8b}, [%0], #32 \n"
MEMACCESS(3)
"ld4 {v4.8b-v7.8b}, [%3], #32 \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
// 00 10 01 11 02 12 03 13
// 40 50 41 51 42 52 43 53
"trn1 v16.8b, v0.8b, v1.8b \n"
"trn2 v17.8b, v0.8b, v1.8b \n"
"trn1 v18.8b, v4.8b, v5.8b \n"
"trn2 v19.8b, v4.8b, v5.8b \n"
// 20 30 21 31 22 32 23 33
// 60 70 61 71 62 72 63 73
"trn1 v0.8b, v2.8b, v3.8b \n"
"trn2 v1.8b, v2.8b, v3.8b \n"
"trn1 v4.8b, v6.8b, v7.8b \n"
"trn2 v5.8b, v6.8b, v7.8b \n"
// 00+10 01+11 02+12 03+13
// 40+50 41+51 42+52 43+53
"uaddlp v16.4h, v16.8b \n"
"uaddlp v17.4h, v17.8b \n"
"uaddlp v18.4h, v18.8b \n"
"uaddlp v19.4h, v19.8b \n"
// 60+70 61+71 62+72 63+73
"uaddlp v1.4h, v1.8b \n"
"uaddlp v5.4h, v5.8b \n"
// combine source lines
"add v16.4h, v16.4h, v18.4h \n"
"add v17.4h, v17.4h, v19.4h \n"
"add v2.4h, v1.4h, v5.4h \n"
// dst_ptr[3] = (s[6] + s[7] + s[6+st] + s[7+st]) / 4
"uqrshrn v2.8b, v2.8h, #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.
// xx 20 xx 30 xx 21 xx 31 xx 22 xx 32 xx 23 xx 33
// combine source lines
"uaddl v0.8h, v0.8b, v4.8b \n"
// xx 20 xx 21 xx 22 xx 23
// xx 30 xx 31 xx 32 xx 33
"trn1 v1.8h, v0.8h, v0.8h \n"
"trn2 v4.8h, v0.8h, v0.8h \n"
"xtn v0.4h, v1.4s \n"
"xtn v4.4h, v4.4s \n"
// 0+1+2, 3+4+5
"add v16.8h, v16.8h, v0.8h \n"
"add v17.8h, v17.8h, v4.8h \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.
"sqrdmulh v0.8h, v16.8h, v30.8h \n"
"sqrdmulh v1.8h, v17.8h, v30.8h \n"
// Align for table lookup, vtbl requires registers to
// be adjacent
"tbl v3.16b, {v0.16b, v1.16b, v2.16b}, v31.16b \n"
MEMACCESS(1)
"st1 {v3.8b}, [%1], #8 \n"
MEMACCESS(1)
"st1 {v3.s}[2], [%1], #4 \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
: "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v16", "v17",
"v18", "v19", "v30", "v31", "memory", "cc"
);
}
#endif //HAS_SCALEROWDOWN38_NEON
// 16x2 -> 16x1
void ScaleFilterRows_NEON(uint8* dst_ptr,
const uint8* src_ptr, ptrdiff_t src_stride,
int dst_width, int source_y_fraction) {
int y_fraction = 256 - source_y_fraction;
asm volatile (
"cmp %4, #0 \n"
"beq 100f \n"
"add %2, %2, %1 \n"
"cmp %4, #64 \n"
"beq 75f \n"
"cmp %4, #128 \n"
"beq 50f \n"
"cmp %4, #192 \n"
"beq 25f \n"
"dup v5.8b, %w4 \n"
"dup v4.8b, %w5 \n"
// General purpose row blend.
"1: \n"
MEMACCESS(1)
"ld1 {v0.16b}, [%1], #16 \n"
MEMACCESS(2)
"ld1 {v1.16b}, [%2], #16 \n"
"subs %3, %3, #16 \n"
"umull v6.8h, v0.8b, v4.8b \n"
"umull2 v7.8h, v0.16b, v4.16b \n"
"umlal v6.8h, v1.8b, v5.8b \n"
"umlal2 v7.8h, v1.16b, v5.16b \n"
"rshrn v0.8b, v6.8h, #8 \n"
"rshrn2 v0.16b, v7.8h, #8 \n"
MEMACCESS(0)
"st1 {v0.16b}, [%0], #16 \n"
"bgt 1b \n"
"b 99f \n"
// Blend 25 / 75.
"25: \n"
MEMACCESS(1)
"ld1 {v0.16b}, [%1], #16 \n"
MEMACCESS(2)
"ld1 {v1.16b}, [%2], #16 \n"
"subs %3, %3, #16 \n"
"urhadd v0.16b, v0.16b, v1.16b \n"
"urhadd v0.16b, v0.16b, v1.16b \n"
MEMACCESS(0)
"st1 {v0.16b}, [%0], #16 \n"
"bgt 25b \n"
"b 99f \n"
// Blend 50 / 50.
"50: \n"
MEMACCESS(1)
"ld1 {v0.16b}, [%1], #16 \n"
MEMACCESS(2)
"ld1 {v1.16b}, [%2], #16 \n"
"subs %3, %3, #16 \n"
"urhadd v0.16b, v0.16b, v1.16b \n"
MEMACCESS(0)
"st1 {v0.16b}, [%0], #16 \n"
"bgt 50b \n"
"b 99f \n"
// Blend 75 / 25.
"75: \n"
MEMACCESS(1)
"ld1 {v1.16b}, [%1], #16 \n"
MEMACCESS(2)
"ld1 {v0.16b}, [%2], #16 \n"
"subs %3, %3, #16 \n"
"urhadd v0.16b, v0.16b, v1.16b \n"
"urhadd v0.16b, v0.16b, v1.16b \n"
MEMACCESS(0)
"st1 {v0.16b}, [%0], #16 \n"
"bgt 75b \n"
"b 99f \n"
// Blend 100 / 0 - Copy row unchanged.
"100: \n"
MEMACCESS(1)
"ld1 {v0.16b}, [%1], #16 \n"
"subs %3, %3, #16 \n"
MEMACCESS(0)
"st1 {v0.16b}, [%0], #16 \n"
"bgt 100b \n"
"99: \n"
MEMACCESS(0)
"st1 {v0.b}[15], [%0] \n"
: "+r"(dst_ptr), // %0
"+r"(src_ptr), // %1
"+r"(src_stride), // %2
"+r"(dst_width), // %3
"+r"(source_y_fraction),// %4
"+r"(y_fraction) // %5
:
: "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "memory", "cc"
);
}
#ifdef HAS_SCALEARGBROWDOWN2_NEON
void ScaleARGBRowDown2_NEON(const uint8* src_ptr, ptrdiff_t src_stride,
uint8* dst, int dst_width) {
asm volatile (
"1: \n"
// load even pixels into q0, odd into q1
MEMACCESS (0)
"ld2 {v0.4s, v1.4s}, [%0], #32 \n"
MEMACCESS (0)
"ld2 {v2.4s, v3.4s}, [%0], #32 \n"
"subs %2, %2, #8 \n" // 8 processed per loop
MEMACCESS (1)
"st1 {v1.16b}, [%1], #16 \n" // store odd pixels
MEMACCESS (1)
"st1 {v3.16b}, [%1], #16 \n"
"bgt 1b \n"
: "+r" (src_ptr), // %0
"+r" (dst), // %1
"+r" (dst_width) // %2
:
: "memory", "cc", "v0", "v1", "v2", "v3" // Clobber List
);
}
#endif //HAS_SCALEARGBROWDOWN2_NEON
#ifdef HAS_SCALEARGBROWDOWN2_NEON
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"
"1: \n"
MEMACCESS (0)
"ld4 {v0.16b - v3.16b}, [%0], #64 \n" // load 8 ARGB pixels.
"subs %3, %3, #8 \n" // 8 processed per loop.
"uaddlp v0.8h, v0.16b \n" // B 16 bytes -> 8 shorts.
"uaddlp v1.8h, v1.16b \n" // G 16 bytes -> 8 shorts.
"uaddlp v2.8h, v2.16b \n" // R 16 bytes -> 8 shorts.
"uaddlp v3.8h, v3.16b \n" // A 16 bytes -> 8 shorts.
MEMACCESS (1)
"ld4 {v16.16b - v19.16b}, [%1], #64 \n" // load 8 more ARGB pixels.
"uadalp v0.8h, v16.16b \n" // B 16 bytes -> 8 shorts.
"uadalp v1.8h, v17.16b \n" // G 16 bytes -> 8 shorts.
"uadalp v2.8h, v18.16b \n" // R 16 bytes -> 8 shorts.
"uadalp v3.8h, v19.16b \n" // A 16 bytes -> 8 shorts.
"rshrn v0.8b, v0.8h, #2 \n" // downshift, round and pack
"rshrn v1.8b, v1.8h, #2 \n"
"rshrn v2.8b, v2.8h, #2 \n"
"rshrn v3.8b, v3.8h, #2 \n"
MEMACCESS (2)
"st4 {v0.8b - v3.8b}, [%2], #32 \n"
"bgt 1b \n"
: "+r" (src_ptr), // %0
"+r" (src_stride), // %1
"+r" (dst), // %2
"+r" (dst_width) // %3
:
: "memory", "cc", "v0", "v1", "v2", "v3", "v16", "v17", "v18", "v19"
);
}
#endif //HAS_SCALEARGBROWDOWN2_NEON
#ifdef HAS_SCALEARGBROWDOWNEVEN_NEON
// 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 (
"1: \n"
MEMACCESS(0)
"ld1 {v0.s}[0], [%0], %3 \n"
MEMACCESS(0)
"ld1 {v0.s}[1], [%0], %3 \n"
MEMACCESS(0)
"ld1 {v0.s}[2], [%0], %3 \n"
MEMACCESS(0)
"ld1 {v0.s}[3], [%0], %3 \n"
"subs %2, %2, #4 \n" // 4 pixels per loop.
MEMACCESS(1)
"st1 {v0.16b}, [%1], #16 \n"
"bgt 1b \n"
: "+r"(src_argb), // %0
"+r"(dst_argb), // %1
"+r"(dst_width) // %2
: "r"(src_stepx * 4) // %3
: "memory", "cc", "v0"
);
}
#endif //HAS_SCALEARGBROWDOWNEVEN_NEON
#ifdef HAS_SCALEARGBROWDOWNEVEN_NEON
// Reads 4 pixels at a time.
// Alignment requirement: src_argb 4 byte aligned.
// TODO, might be worth another optimization pass in future.
// It could be upgraded to 8 pixels at a time to start with.
void ScaleARGBRowDownEvenBox_NEON(const uint8* src_argb, ptrdiff_t src_stride,
int src_stepx,
uint8* dst_argb, int dst_width) {
asm volatile (
"add %1, %1, %0 \n"
"1: \n"
MEMACCESS(0)
"ld1 {v0.8b}, [%0], %4 \n" // Read 4 2x2 blocks -> 2x1
MEMACCESS(1)
"ld1 {v1.8b}, [%1], %4 \n"
MEMACCESS(0)
"ld1 {v2.8b}, [%0], %4 \n"
MEMACCESS(1)
"ld1 {v3.8b}, [%1], %4 \n"
MEMACCESS(0)
"ld1 {v4.8b}, [%0], %4 \n"
MEMACCESS(1)
"ld1 {v5.8b}, [%1], %4 \n"
MEMACCESS(0)
"ld1 {v6.8b}, [%0], %4 \n"
MEMACCESS(1)
"ld1 {v7.8b}, [%1], %4 \n"
"uaddl v0.8h, v0.8b, v1.8b \n"
"uaddl v2.8h, v2.8b, v3.8b \n"
"uaddl v4.8h, v4.8b, v5.8b \n"
"uaddl v6.8h, v6.8b, v7.8b \n"
"mov v16.d[1], v0.d[1] \n" // ab_cd -> ac_bd
"mov v0.d[1], v2.d[0] \n"
"mov v2.d[0], v16.d[1] \n"
"mov v16.d[1], v4.d[1] \n" // ef_gh -> eg_fh
"mov v4.d[1], v6.d[0] \n"
"mov v6.d[0], v16.d[1] \n"
"add v0.8h, v0.8h, v2.8h \n" // (a+b)_(c+d)
"add v4.8h, v4.8h, v6.8h \n" // (e+f)_(g+h)
"rshrn v0.8b, v0.8h, #2 \n" // first 2 pixels.
"rshrn2 v0.16b, v4.8h, #2 \n" // next 2 pixels.
"subs %3, %3, #4 \n" // 4 pixels per loop.
MEMACCESS(2)
"st1 {v0.16b}, [%2], #16 \n"
"bgt 1b \n"
: "+r"(src_argb), // %0
"+r"(src_stride), // %1
"+r"(dst_argb), // %2
"+r"(dst_width) // %3
: "r"(src_stepx * 4) // %4
: "memory", "cc", "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v16"
);
}
#endif // HAS_SCALEARGBROWDOWNEVEN_NEON
#endif // __aarch64__
#ifdef __cplusplus
} // extern "C"
} // namespace libyuv
#endif
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