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https://git.ffmpeg.org/ffmpeg.git
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77e6293735
Use "bx lr", or "pop {lr}", which do proper mode switching
between thumb and arm modes. A plain "mov pc, lr" does not switch
from thumb mode to arm mode (while in arm mode, it does switch
mode for a thumb caller).
This is normally not an issue, as CONFIG_THUMB only is enabled if
the C compiler defaults to thumb; but stick to patterns that can
do mode switching if needed, for consistency.
Signed-off-by: Martin Storsjö <martin@martin.st>
70 lines
5.2 KiB
ArmAsm
70 lines
5.2 KiB
ArmAsm
/*
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* Copyright (c) 2016 Clément Bœsch <clement stupeflix.com>
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* Copyright (c) 2016 Matthieu Bouron <matthieu.bouron stupeflix.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/arm/asm.S"
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function ff_hscale_8_to_15_neon, export=1
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push {r4-r12, lr}
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vpush {q4-q7}
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ldr r4, [sp, #104] @ filter
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ldr r5, [sp, #108] @ filterPos
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ldr r6, [sp, #112] @ filterSize
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add r10, r4, r6, lsl #1 @ filter2 = filter + filterSize * 2
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1: ldr r8, [r5], #4 @ filterPos[0]
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ldr r9, [r5], #4 @ filterPos[1]
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vmov.s32 q4, #0 @ val accumulator
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vmov.s32 q5, #0 @ val accumulator
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mov r7, r6 @ tmpfilterSize = filterSize
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mov r0, r3 @ srcp
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2: add r11, r0, r8 @ srcp + filterPos[0]
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add r12, r0, r9 @ srcp + filterPos[1]
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vld1.8 d0, [r11] @ srcp[filterPos[0] + {0..7}]
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vld1.8 d2, [r12] @ srcp[filterPos[1] + {0..7}]
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vld1.16 {q2}, [r4]! @ load 8x16-bit filter values
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vld1.16 {q3}, [r10]! @ load 8x16-bit filter values
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vmovl.u8 q0, d0 @ unpack src values to 16-bit
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vmovl.u8 q1, d2 @ unpack src values to 16-bit
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vmull.s16 q8, d0, d4 @ srcp[filterPos[0] + {0..7}] * filter[{0..7}] (part 1)
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vmull.s16 q9, d1, d5 @ srcp[filterPos[0] + {0..7}] * filter[{0..7}] (part 2)
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vmull.s16 q10, d2, d6 @ srcp[filterPos[1] + {0..7}] * filter[{0..7}] (part 1)
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vmull.s16 q11, d3, d7 @ srcp[filterPos[1] + {0..7}] * filter[{0..7}] (part 2)
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vpadd.s32 d16, d16, d17 @ horizontal pair adding of the 8x32-bit multiplied values into 4x32-bit (part 1)
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vpadd.s32 d17, d18, d19 @ horizontal pair adding of the 8x32-bit multiplied values into 4x32-bit (part 2)
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vpadd.s32 d20, d20, d21 @ horizontal pair adding of the 8x32-bit multiplied values into 4x32-bit (part 1)
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vpadd.s32 d21, d22, d23 @ horizontal pair adding of the 8x32-bit multiplied values into 4x32-bit (part 2)
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vadd.s32 q4, q8 @ update val accumulator
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vadd.s32 q5, q10 @ update val accumulator
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add r0, #8 @ srcp += 8
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subs r7, #8 @ tmpfilterSize -= 8
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bgt 2b @ loop until tmpfilterSize is consumed
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mov r4, r10 @ filter = filter2
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add r10, r10, r6, lsl #1 @ filter2 += filterSize * 2
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vpadd.s32 d8, d8, d9 @ horizontal pair adding of the 8x32-bit sums into 4x32-bit (part 1)
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vpadd.s32 d9, d10, d11 @ horizontal pair adding of the 8x32-bit sums into 4x32-bit (part 2)
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vpadd.s32 d8, d8, d9 @ horizontal pair adding of the 4x32-bit sums into 2x32-bit
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vqshrn.s32 d8, q4, #7 @ shift and clip the 2x16-bit final values
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vst1.32 {d8[0]},[r1]! @ write destination
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subs r2, #2 @ dstW -= 2
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bgt 1b @ loop until end of line
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vpop {q4-q7}
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pop {r4-r12, pc}
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endfunc
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