mirror of https://github.com/FFmpeg/FFmpeg.git
~25% faster dts decoding overall. The checkasm CPU cycles numbers are not that useful since synth_filter_float() calls FFTContext.imdct_half(). cortex-a57 cortex-a53 synth_filter_float_c: 1866.2 3490.9 synth_filter_float_neon: 915.0 1531.5 With fftc.imdct_half forced to imdct_half_neon: cortex-a57 cortex-a53 synth_filter_float_c: 1718.4 3025.3 synth_filter_float_neon: 926.2 1530.1pull/172/head
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/* |
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* Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
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* Copyright (c) 2015 Janne Grunau <janne-libav@jannau.net>
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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 "asm-offsets.h" |
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#include "libavutil/aarch64/asm.S" |
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.macro inner_loop
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ld1 {v29.4s}, [x9], x15 |
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ld1 {v28.4s}, [x8], x15 |
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ld1 {v30.4s}, [x10], x15 |
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ld1 {v31.4s}, [x11], x15 |
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rev64 v28.4s, v28.4s |
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ld1 {v24.4s}, [x4], x15 |
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ld1 {v25.4s}, [x5], x15 |
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rev64 v31.4s, v31.4s |
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ld1 {v26.4s}, [x6], x15 |
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fmla v5.4s, v25.4s, v29.4s |
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ld1 {v27.4s}, [x7], x15 |
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ext v28.16b, v28.16b, v28.16b, #8 |
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ext v31.16b, v31.16b, v31.16b, #8 |
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fmla v6.4s, v26.4s, v30.4s |
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fmls v4.4s, v24.4s, v28.4s |
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fmla v7.4s, v27.4s, v31.4s |
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.endm |
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function ff_synth_filter_float_neon, export=1 |
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ldr w7, [x2] // *synth_buf_offset |
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ldr x9, [x0, #IMDCT_HALF] // imdct_half function pointer |
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sxtw x7, w7 |
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stp x3, x4, [sp, #-64]! |
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add x1, x1, x7, lsl #2 // synth_buf |
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sub w8, w7, #32 |
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stp x5, x1, [sp, #16] |
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bic x7, x7, #63 |
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and w8, w8, #511 |
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stp x7, x30, [sp, #32] |
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str w8, [x2] |
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str s0, [sp, #48] |
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mov x2, x6 // in |
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blr x9 |
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ldp x2, x4, [sp] // synct_buf_2, window |
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ldp x13, x9, [sp, #16] // out, synth_buf |
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ldp x0, x30, [sp, #32] // *synth_buf_offset |
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ldr s0, [sp, #48] |
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add x3, x2, #16*4 // synct_buf_2 + 16 |
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add x14, x13, #16*4 // out + 16 |
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add x8, x9, #12*4 |
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mov x15, #64*4 |
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mov x1, #4 |
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1: |
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add x10, x9, #16*4 // synth_buf |
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add x11, x8, #16*4 |
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add x5, x4, #16*4 // window |
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add x6, x4, #32*4 |
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add x7, x4, #48*4 |
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ld1 {v4.4s}, [x2] // a |
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ld1 {v5.4s}, [x3] // b |
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movi v6.4s, #0 // c |
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movi v7.4s, #0 // d |
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mov x12, #512 |
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2: |
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sub x12, x12, #64 |
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cmp x12, x0 |
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inner_loop |
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b.gt 2b |
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sub x8, x8, #512*4 |
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sub x9, x9, #512*4 |
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cbz x12, 4f |
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sub x10, x10, #512*4 |
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sub x11, x11, #512*4 |
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3: |
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subs x12, x12, #64 |
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inner_loop |
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b.gt 3b |
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4: |
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subs x1, x1, #1 |
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fmul v4.4s, v4.4s, v0.s[0] |
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fmul v5.4s, v5.4s, v0.s[0] |
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st1 {v6.4s}, [x2], #16 |
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st1 {v7.4s}, [x3], #16 |
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st1 {v4.4s}, [x13], #16 |
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st1 {v5.4s}, [x14], #16 |
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b.le 10f |
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sub x4, x4, #508*4 // window |
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add x9, x9, #4*4 // synth_buf |
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sub x8, x8, #4*4 // synth_buf |
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b 1b |
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10: |
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add sp, sp, #64 |
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ret |
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endfunc |
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