mirror of https://github.com/encounter/SDL.git
ARM: SIMD assembly optimization for function BlitRGBtoRGBPixelAlpha
Much of the heavy lifting of this optimization is lifted from the Pixman project, which is distributed under an MIT-style license. As far as possible, these elements have been relicensed to the zlib license.
This commit is contained in:
Ben Avison
parent
6a6a05289e
commit
57723b83e8
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@ -389,6 +389,23 @@ BlitRGBtoRGBPixelAlphaMMX(SDL_BlitInfo * info)
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#endif /* __MMX__ */
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#if SDL_ARM_SIMD_BLITTERS
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void BlitRGBtoRGBPixelAlphaARMSIMDAsm(int32_t w, int32_t h, uint32_t *dst, int32_t dst_stride, uint32_t *src, int32_t src_stride);
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static void
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BlitRGBtoRGBPixelAlphaARMSIMD(SDL_BlitInfo * info)
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{
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int32_t width = info->dst_w;
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int32_t height = info->dst_h;
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uint32_t *dstp = (uint32_t *)info->dst;
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int32_t dststride = width + (info->dst_skip >> 2);
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uint32_t *srcp = (uint32_t *)info->src;
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int32_t srcstride = width + (info->src_skip >> 2);
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BlitRGBtoRGBPixelAlphaARMSIMDAsm(width, height, dstp, dststride, srcp, srcstride);
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}
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#endif
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/* fast RGB888->(A)RGB888 blending with surface alpha=128 special case */
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static void
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BlitRGBtoRGBSurfaceAlpha128(SDL_BlitInfo * info)
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@ -1315,6 +1332,10 @@ SDL_CalculateBlitA(SDL_Surface * surface)
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}
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#endif /* __MMX__ || __3dNOW__ */
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if (sf->Amask == 0xff000000) {
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#if SDL_ARM_SIMD_BLITTERS
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if (SDL_HasARMSIMD())
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return BlitRGBtoRGBPixelAlphaARMSIMD;
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#endif
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return BlitRGBtoRGBPixelAlpha;
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}
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}
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@ -0,0 +1,36 @@
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/*
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* Copyright © 2010 Nokia Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of Mozilla Corporation not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Mozilla Corporation makes no
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* representations about the suitability of this software for any purpose. It
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* is provided "as is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*
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* Author: Siarhei Siamashka (siarhei.siamashka@nokia.com)
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*
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*/
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/* Supplementary macro for setting function attributes */
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.macro pixman_asm_function fname
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.func fname
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.global fname
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#ifdef __ELF__
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.hidden fname
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.type fname, %function
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#endif
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fname:
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.endm
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@ -0,0 +1,168 @@
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/*
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* Copyright (c) 2016 RISC OS Open Ltd
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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/* Prevent the stack from becoming executable */
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#if defined(__linux__) && defined(__ELF__)
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.section .note.GNU-stack,"",%progbits
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#endif
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.text
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.arch armv6
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.object_arch armv4
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.arm
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.altmacro
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.p2align 2
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#include "pixman-arm-asm.h"
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#include "pixman-arm-simd-asm.h"
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/* A head macro should do all processing which results in an output of up to
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* 16 bytes, as far as the final load instruction. The corresponding tail macro
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* should complete the processing of the up-to-16 bytes. The calling macro will
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* sometimes choose to insert a preload or a decrement of X between them.
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* cond ARM condition code for code block
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* numbytes Number of output bytes that should be generated this time
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* firstreg First WK register in which to place output
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* unaligned_src Whether to use non-wordaligned loads of source image
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* unaligned_mask Whether to use non-wordaligned loads of mask image
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* preload If outputting 16 bytes causes 64 bytes to be read, whether an extra preload should be output
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*/
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/******************************************************************************/
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/* This differs from the over_8888_8888 routine in Pixman in that the destination
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* alpha component is always left unchanged, and RGB components are not
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* premultiplied by alpha. It differs from BlitRGBtoRGBPixelAlpha in that
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* renormalisation is done by multiplying by 257/256 (with rounding) rather than
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* simply shifting right by 8 bits - removing the need to special-case alpha=0xff.
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*/
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.macro RGBtoRGBPixelAlpha_init
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line_saved_regs STRIDE_S, ORIG_W
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mov MASK, #0x80
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.endm
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.macro RGBtoRGBPixelAlpha_1pixel_translucent s, d, tmp0, tmp1, tmp2, tmp3, half
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uxtb tmp3, s
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uxtb tmp0, d
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sub tmp0, tmp3, tmp0
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uxtb tmp3, s, ror #16
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uxtb tmp1, d, ror #16
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sub tmp1, tmp3, tmp1
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uxtb tmp3, s, ror #8
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mov s, s, lsr #24
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uxtb tmp2, d, ror #8
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sub tmp2, tmp3, tmp2
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smlabb tmp0, tmp0, s, half
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smlabb tmp1, tmp1, s, half
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smlabb tmp2, tmp2, s, half
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add tmp0, tmp0, asr #8
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add tmp1, tmp1, asr #8
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add tmp2, tmp2, asr #8
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pkhbt tmp0, tmp0, tmp1, lsl #16
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and tmp2, tmp2, #0xff00
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uxtb16 tmp0, tmp0, ror #8
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orr tmp0, tmp0, tmp2
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uadd8 d, d, tmp0
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.endm
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.macro RGBtoRGBPixelAlpha_1pixel_opaque s, d
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and d, d, #0xff000000
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bic s, s, #0xff000000
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orr d, d, s
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.endm
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.macro RGBtoRGBPixelAlpha_process_head cond, numbytes, firstreg, unaligned_src, unaligned_mask, preload
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.if numbytes == 16
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ldm SRC!, {WK0, WK1}
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ldm SRC!, {STRIDE_S, STRIDE_M}
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ldrd WK2, WK3, [DST], #16
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orr SCRATCH, WK0, WK1
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and ORIG_W, WK0, WK1
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orr SCRATCH, SCRATCH, STRIDE_S
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and ORIG_W, ORIG_W, STRIDE_S
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orr SCRATCH, SCRATCH, STRIDE_M
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and ORIG_W, ORIG_W, STRIDE_M
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tst SCRATCH, #0xff000000
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.elseif numbytes == 8
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ldm SRC!, {WK0, WK1}
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ldm DST!, {WK2, WK3}
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orr SCRATCH, WK0, WK1
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and ORIG_W, WK0, WK1
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tst SCRATCH, #0xff000000
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.else // numbytes == 4
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ldr WK0, [SRC], #4
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ldr WK2, [DST], #4
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tst WK0, #0xff000000
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.endif
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.endm
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.macro RGBtoRGBPixelAlpha_process_tail cond, numbytes, firstreg
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beq 20f @ all transparent
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.if numbytes == 16
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cmp ORIG_W, #0xff000000
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bhs 10f @ all opaque
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RGBtoRGBPixelAlpha_1pixel_translucent WK0, WK2, STRIDE_S, STRIDE_M, SCRATCH, ORIG_W, MASK
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RGBtoRGBPixelAlpha_1pixel_translucent WK1, WK3, STRIDE_S, STRIDE_M, SCRATCH, ORIG_W, MASK
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strd WK2, WK3, [DST, #-16]
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ldrd WK0, WK1, [SRC, #-8]
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ldrd WK2, WK3, [DST, #-8]
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RGBtoRGBPixelAlpha_1pixel_translucent WK0, WK2, STRIDE_S, STRIDE_M, SCRATCH, ORIG_W, MASK
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RGBtoRGBPixelAlpha_1pixel_translucent WK1, WK3, STRIDE_S, STRIDE_M, SCRATCH, ORIG_W, MASK
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b 19f
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10: RGBtoRGBPixelAlpha_1pixel_opaque WK0, WK2
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RGBtoRGBPixelAlpha_1pixel_opaque WK1, WK3
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strd WK2, WK3, [DST, #-16]
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ldrd WK0, WK1, [SRC, #-8]
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ldrd WK2, WK3, [DST, #-8]
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RGBtoRGBPixelAlpha_1pixel_opaque WK0, WK2
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RGBtoRGBPixelAlpha_1pixel_opaque WK1, WK3
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19: strd WK2, WK3, [DST, #-8]
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.elseif numbytes == 8
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cmp ORIG_W, #0xff000000
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bhs 10f @ all opaque
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RGBtoRGBPixelAlpha_1pixel_translucent WK0, WK2, STRIDE_S, STRIDE_M, SCRATCH, ORIG_W, MASK
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RGBtoRGBPixelAlpha_1pixel_translucent WK1, WK3, STRIDE_S, STRIDE_M, SCRATCH, ORIG_W, MASK
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b 19f
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10: RGBtoRGBPixelAlpha_1pixel_opaque WK0, WK2
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RGBtoRGBPixelAlpha_1pixel_opaque WK1, WK3
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19: strd WK2, WK3, [DST, #-8]
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.else // numbytes == 4
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cmp WK0, #0xff000000
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bhs 10f @ opaque
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RGBtoRGBPixelAlpha_1pixel_translucent WK0, WK2, STRIDE_S, STRIDE_M, SCRATCH, ORIG_W, MASK
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b 19f
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10: RGBtoRGBPixelAlpha_1pixel_opaque WK0, WK2
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19: str WK2, [DST, #-4]
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.endif
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20:
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.endm
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generate_composite_function \
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BlitRGBtoRGBPixelAlphaARMSIMDAsm, 32, 0, 32, \
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FLAG_DST_READWRITE | FLAG_BRANCH_OVER | FLAG_PROCESS_CORRUPTS_PSR | FLAG_PROCESS_DOES_STORE | FLAG_SPILL_LINE_VARS | FLAG_PROCESS_CORRUPTS_WK0, \
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2, /* prefetch distance */ \
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RGBtoRGBPixelAlpha_init, \
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nop_macro, /* newline */ \
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nop_macro, /* cleanup */ \
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RGBtoRGBPixelAlpha_process_head, \
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RGBtoRGBPixelAlpha_process_tail
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/******************************************************************************/
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