| /* |
| * 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/scale.h" |
| #include "libyuv/row.h" |
| #include "libyuv/scale_row.h" |
| |
| #ifdef __cplusplus |
| namespace libyuv { |
| extern "C" { |
| #endif |
| |
| // This module is for GCC Neon armv8 64 bit. |
| #if !defined(LIBYUV_DISABLE_NEON) && defined(__aarch64__) |
| |
| // 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 |
| "b.gt 1b \n" |
| : "+r"(src_ptr), // %0 |
| "+r"(dst), // %1 |
| "+r"(dst_width) // %2 |
| : |
| : "v0", "v1" // 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, %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" |
| "b.gt 1b \n" |
| : "+r"(src_ptr), // %0 |
| "+r"(src_stride), // %1 |
| "+r"(dst), // %2 |
| "+r"(dst_width) // %3 |
| : |
| : "v0", "v1", "v2", "v3" // Clobber List |
| ); |
| } |
| |
| 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,v1.8b,v2.8b,v3.8b}, [%0], #32 \n" // src line 0 |
| "subs %2, %2, #8 \n" // 8 processed per loop |
| MEMACCESS(1) |
| "st1 {v2.8b}, [%1], #8 \n" |
| "b.gt 1b \n" |
| : "+r"(src_ptr), // %0 |
| "+r"(dst_ptr), // %1 |
| "+r"(dst_width) // %2 |
| : |
| : "v0", "v1", "v2", "v3", "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 ( |
| "1: \n" |
| MEMACCESS(0) |
| "ld1 {v0.16b}, [%0], #16 \n" // load up 16x4 |
| MEMACCESS(3) |
| "ld1 {v1.16b}, [%2], #16 \n" |
| MEMACCESS(4) |
| "ld1 {v2.16b}, [%3], #16 \n" |
| MEMACCESS(5) |
| "ld1 {v3.16b}, [%4], #16 \n" |
| "subs %5, %5, #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" |
| "b.gt 1b \n" |
| : "+r"(src_ptr), // %0 |
| "+r"(dst_ptr), // %1 |
| "+r"(src_ptr1), // %2 |
| "+r"(src_ptr2), // %3 |
| "+r"(src_ptr3), // %4 |
| "+r"(dst_width) // %5 |
| : |
| : "v0", "v1", "v2", "v3", "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 ( |
| "1: \n" |
| MEMACCESS(0) |
| "ld4 {v0.8b,v1.8b,v2.8b,v3.8b}, [%0], #32 \n" // src line 0 |
| "subs %2, %2, #24 \n" |
| "orr v2.16b, v3.16b, v3.16b \n" // order v0, v1, v2 |
| MEMACCESS(1) |
| "st3 {v0.8b,v1.8b,v2.8b}, [%1], #24 \n" |
| "b.gt 1b \n" |
| : "+r"(src_ptr), // %0 |
| "+r"(dst_ptr), // %1 |
| "+r"(dst_width) // %2 |
| : |
| : "v0", "v1", "v2", "v3", "memory", "cc" |
| ); |
| } |
| |
| 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,v1.8b,v2.8b,v3.8b}, [%0], #32 \n" // src line 0 |
| MEMACCESS(3) |
| "ld4 {v4.8b,v5.8b,v6.8b,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,v1.8b,v2.8b}, [%1], #24 \n" |
| |
| "b.gt 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" |
| ); |
| } |
| |
| 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,v1.8b,v2.8b,v3.8b}, [%0], #32 \n" // src line 0 |
| MEMACCESS(3) |
| "ld4 {v4.8b,v5.8b,v6.8b,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,v1.8b,v2.8b}, [%1], #24 \n" |
| "b.gt 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" |
| ); |
| } |
| |
| 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" |
| "b.gt 1b \n" |
| : "+r"(src_ptr), // %0 |
| "+r"(dst_ptr), // %1 |
| "+r"(dst_width) // %2 |
| : "r"(&kShuf38) // %3 |
| : "v0", "v1", "v2", "v3", "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; |
| ptrdiff_t tmp_src_stride = src_stride; |
| |
| asm volatile ( |
| MEMACCESS(5) |
| "ld1 {v29.8h}, [%5] \n" |
| MEMACCESS(6) |
| "ld1 {v30.16b}, [%6] \n" |
| MEMACCESS(7) |
| "ld1 {v31.8h}, [%7] \n" |
| "add %2, %2, %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,v1.8b,v2.8b,v3.8b}, [%0], #32 \n" |
| MEMACCESS(3) |
| "ld4 {v4.8b,v5.8b,v6.8b,v7.8b}, [%2], #32 \n" |
| MEMACCESS(4) |
| "ld4 {v16.8b,v17.8b,v18.8b,v19.8b}, [%3], #32 \n" |
| "subs %4, %4, #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" |
| "b.gt 1b \n" |
| : "+r"(src_ptr), // %0 |
| "+r"(dst_ptr), // %1 |
| "+r"(tmp_src_stride), // %2 |
| "+r"(src_ptr1), // %3 |
| "+r"(dst_width) // %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" |
| ); |
| } |
| |
| // 32x2 -> 12x1 |
| void ScaleRowDown38_2_Box_NEON(const uint8* src_ptr, |
| ptrdiff_t src_stride, |
| uint8* dst_ptr, int dst_width) { |
| // TODO(fbarchard): use src_stride directly for clang 3.5+. |
| ptrdiff_t tmp_src_stride = src_stride; |
| asm volatile ( |
| MEMACCESS(4) |
| "ld1 {v30.8h}, [%4] \n" |
| MEMACCESS(5) |
| "ld1 {v31.16b}, [%5] \n" |
| "add %2, %2, %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,v1.8b,v2.8b,v3.8b}, [%0], #32 \n" |
| MEMACCESS(3) |
| "ld4 {v4.8b,v5.8b,v6.8b,v7.8b}, [%2], #32 \n" |
| "subs %3, %3, #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" |
| "b.gt 1b \n" |
| : "+r"(src_ptr), // %0 |
| "+r"(dst_ptr), // %1 |
| "+r"(tmp_src_stride), // %2 |
| "+r"(dst_width) // %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" |
| ); |
| } |
| |
| // 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" |
| "b.eq 100f \n" |
| "add %2, %2, %1 \n" |
| "cmp %4, #64 \n" |
| "b.eq 75f \n" |
| "cmp %4, #128 \n" |
| "b.eq 50f \n" |
| "cmp %4, #192 \n" |
| "b.eq 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" |
| "b.gt 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" |
| "b.gt 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" |
| "b.gt 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" |
| "b.gt 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" |
| "b.gt 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" |
| ); |
| } |
| |
| 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" |
| "b.gt 1b \n" |
| : "+r" (src_ptr), // %0 |
| "+r" (dst), // %1 |
| "+r" (dst_width) // %2 |
| : |
| : "memory", "cc", "v0", "v1", "v2", "v3" // 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" |
| "1: \n" |
| MEMACCESS (0) |
| "ld4 {v0.16b,v1.16b,v2.16b,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,v17.16b,v18.16b,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,v1.8b,v2.8b,v3.8b}, [%2], #32 \n" |
| "b.gt 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" |
| ); |
| } |
| |
| // 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" |
| "b.gt 1b \n" |
| : "+r"(src_argb), // %0 |
| "+r"(dst_argb), // %1 |
| "+r"(dst_width) // %2 |
| : "r"(src_stepx * 4) // %3 |
| : "memory", "cc", "v0" |
| ); |
| } |
| |
| // 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" |
| "b.gt 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 // !defined(LIBYUV_DISABLE_NEON) && defined(__aarch64__) |
| |
| #ifdef __cplusplus |
| } // extern "C" |
| } // namespace libyuv |
| #endif |
