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ARM: NEON assembly optimization for function BlitRGBtoRGBPixelAlpha
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/* | ||
* Copyright © 2009 Nokia Corporation | ||
* | ||
* Permission is hereby granted, free of charge, to any person obtaining a | ||
* copy of this software and associated documentation files (the "Software"), | ||
* to deal in the Software without restriction, including without limitation | ||
* the rights to use, copy, modify, merge, publish, distribute, sublicense, | ||
* and/or sell copies of the Software, and to permit persons to whom the | ||
* Software is furnished to do so, subject to the following conditions: | ||
* | ||
* The above copyright notice and this permission notice (including the next | ||
* paragraph) shall be included in all copies or substantial portions of the | ||
* Software. | ||
* | ||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | ||
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | ||
* DEALINGS IN THE SOFTWARE. | ||
* | ||
* Author: Siarhei Siamashka (siarhei.siamashka@nokia.com) | ||
*/ | ||
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/* | ||
* Copyright (c) 2018 RISC OS Open Ltd | ||
* | ||
* 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. | ||
*/ | ||
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/* Prevent the stack from becoming executable for no reason... */ | ||
#if defined(__linux__) && defined(__ELF__) | ||
.section .note.GNU-stack,"",%progbits | ||
#endif | ||
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.text | ||
.fpu neon | ||
.arch armv7a | ||
.object_arch armv4 | ||
.eabi_attribute 10, 0 /* suppress Tag_FP_arch */ | ||
.eabi_attribute 12, 0 /* suppress Tag_Advanced_SIMD_arch */ | ||
.arm | ||
.altmacro | ||
.p2align 2 | ||
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#include "pixman-arm-asm.h" | ||
#include "pixman-arm-neon-asm.h" | ||
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/* Global configuration options and preferences */ | ||
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/* | ||
* The code can optionally make use of unaligned memory accesses to improve | ||
* performance of handling leading/trailing pixels for each scanline. | ||
* Configuration variable RESPECT_STRICT_ALIGNMENT can be set to 0 for | ||
* example in linux if unaligned memory accesses are not configured to | ||
* generate.exceptions. | ||
*/ | ||
.set RESPECT_STRICT_ALIGNMENT, 1 | ||
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/* | ||
* Set default prefetch type. There is a choice between the following options: | ||
* | ||
* PREFETCH_TYPE_NONE (may be useful for the ARM cores where PLD is set to work | ||
* as NOP to workaround some HW bugs or for whatever other reason) | ||
* | ||
* PREFETCH_TYPE_SIMPLE (may be useful for simple single-issue ARM cores where | ||
* advanced prefetch intruduces heavy overhead) | ||
* | ||
* PREFETCH_TYPE_ADVANCED (useful for superscalar cores such as ARM Cortex-A8 | ||
* which can run ARM and NEON instructions simultaneously so that extra ARM | ||
* instructions do not add (many) extra cycles, but improve prefetch efficiency) | ||
* | ||
* Note: some types of function can't support advanced prefetch and fallback | ||
* to simple one (those which handle 24bpp pixels) | ||
*/ | ||
.set PREFETCH_TYPE_DEFAULT, PREFETCH_TYPE_ADVANCED | ||
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/* Prefetch distance in pixels for simple prefetch */ | ||
.set PREFETCH_DISTANCE_SIMPLE, 64 | ||
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/******************************************************************************/ | ||
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.macro RGBtoRGBPixelAlpha_process_pixblock_head | ||
vmvn d30, d3 /* get inverted source alpha */ | ||
vmov d31, d7 /* dest alpha is always unchanged */ | ||
vmull.u8 q14, d0, d3 | ||
vmlal.u8 q14, d4, d30 | ||
vmull.u8 q0, d1, d3 | ||
vmlal.u8 q0, d5, d30 | ||
vmull.u8 q1, d2, d3 | ||
vmlal.u8 q1, d6, d30 | ||
vrshr.u16 q2, q14, #8 | ||
vrshr.u16 q3, q0, #8 | ||
vraddhn.u16 d28, q14, q2 | ||
vrshr.u16 q2, q1, #8 | ||
vraddhn.u16 d29, q0, q3 | ||
vraddhn.u16 d30, q1, q2 | ||
.endm | ||
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.macro RGBtoRGBPixelAlpha_process_pixblock_tail | ||
/* nothing */ | ||
.endm | ||
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.macro RGBtoRGBPixelAlpha_process_pixblock_tail_head | ||
vld4.8 {d0-d3}, [SRC]! | ||
PF add PF_X, PF_X, #8 | ||
vst4.8 {d28-d31}, [DST_W :128]! | ||
PF tst PF_CTL, #0xF | ||
vld4.8 {d4-d7}, [DST_R :128]! | ||
PF addne PF_X, PF_X, #8 | ||
vmvn d30, d3 /* get inverted source alpha */ | ||
vmov d31, d7 /* dest alpha is always unchanged */ | ||
vmull.u8 q14, d0, d3 | ||
PF subne PF_CTL, PF_CTL, #1 | ||
vmlal.u8 q14, d4, d30 | ||
PF cmp PF_X, ORIG_W | ||
vmull.u8 q0, d1, d3 | ||
PF pld, [PF_SRC, PF_X, lsl #src_bpp_shift] | ||
vmlal.u8 q0, d5, d30 | ||
PF pld, [PF_DST, PF_X, lsl #dst_bpp_shift] | ||
vmull.u8 q1, d2, d3 | ||
PF subge PF_X, PF_X, ORIG_W | ||
vmlal.u8 q1, d6, d30 | ||
PF subges PF_CTL, PF_CTL, #0x10 | ||
vrshr.u16 q2, q14, #8 | ||
PF ldrgeb DUMMY, [PF_SRC, SRC_STRIDE, lsl #src_bpp_shift]! | ||
vrshr.u16 q3, q0, #8 | ||
PF ldrgeb DUMMY, [PF_DST, DST_STRIDE, lsl #dst_bpp_shift]! | ||
vraddhn.u16 d28, q14, q2 | ||
vrshr.u16 q2, q1, #8 | ||
vraddhn.u16 d29, q0, q3 | ||
vraddhn.u16 d30, q1, q2 | ||
.endm | ||
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generate_composite_function \ | ||
BlitRGBtoRGBPixelAlphaARMNEONAsm, 32, 0, 32, \ | ||
FLAG_DST_READWRITE | FLAG_DEINTERLEAVE_32BPP, \ | ||
8, /* number of pixels, processed in a single block */ \ | ||
5, /* prefetch distance */ \ | ||
default_init, \ | ||
default_cleanup, \ | ||
RGBtoRGBPixelAlpha_process_pixblock_head, \ | ||
RGBtoRGBPixelAlpha_process_pixblock_tail, \ | ||
RGBtoRGBPixelAlpha_process_pixblock_tail_head |
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