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FFmpeg/libavcodec/arm/fmtconvert_vfp.S

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/*
* Copyright (c) 2013 RISC OS Open Ltd <bavison@riscosopen.org>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "libavutil/arm/asm.S"
/**
* ARM VFP optimised int32 to float conversion.
* Assume len is a multiple of 8, destination buffer is at least 4 bytes aligned
* (16 bytes alignment is best for BCM2835), little-endian.
*/
@ void ff_int32_to_float_fmul_array8_vfp(FmtConvertContext *c, float *dst, const int32_t *src, const float *mul, int len)
function ff_int32_to_float_fmul_array8_vfp, export=1
push {lr}
ldr a1, [sp, #4]
subs lr, a1, #3*8
bcc 50f @ too short to pipeline
@ Now need to find (len / 8) % 3. The approximation
@ x / 24 = (x * 0xAB) >> 12
@ is good for x < 4096, which is true for both AC3 and DCA.
mov a1, #0xAB
ldr ip, =0x03070000 @ RunFast mode, short vectors of length 8, stride 1
mul a1, lr, a1
vpush {s16-s31}
mov a1, a1, lsr #12
add a1, a1, a1, lsl #1
rsb a1, a1, lr, lsr #3
cmp a1, #1
fmrx a1, FPSCR
fmxr FPSCR, ip
beq 11f
blo 10f
@ Array is (2 + multiple of 3) x 8 floats long
@ drop through...
vldmia a3!, {s16-s23}
vldmia a4!, {s2,s3}
vldmia a3!, {s24-s31}
vcvt.f32.s32 s16, s16
vcvt.f32.s32 s17, s17
vcvt.f32.s32 s18, s18
vcvt.f32.s32 s19, s19
vcvt.f32.s32 s20, s20
vcvt.f32.s32 s21, s21
vcvt.f32.s32 s22, s22
vcvt.f32.s32 s23, s23
vmul.f32 s16, s16, s2
@ drop through...
3:
vldmia a3!, {s8-s15}
vldmia a4!, {s1}
vcvt.f32.s32 s24, s24
vcvt.f32.s32 s25, s25
vcvt.f32.s32 s26, s26
vcvt.f32.s32 s27, s27
vcvt.f32.s32 s28, s28
vcvt.f32.s32 s29, s29
vcvt.f32.s32 s30, s30
vcvt.f32.s32 s31, s31
vmul.f32 s24, s24, s3
vstmia a2!, {s16-s19}
vstmia a2!, {s20-s23}
2:
vldmia a3!, {s16-s23}
vldmia a4!, {s2}
vcvt.f32.s32 s8, s8
vcvt.f32.s32 s9, s9
vcvt.f32.s32 s10, s10
vcvt.f32.s32 s11, s11
vcvt.f32.s32 s12, s12
vcvt.f32.s32 s13, s13
vcvt.f32.s32 s14, s14
vcvt.f32.s32 s15, s15
vmul.f32 s8, s8, s1
vstmia a2!, {s24-s27}
vstmia a2!, {s28-s31}
1:
vldmia a3!, {s24-s31}
vldmia a4!, {s3}
vcvt.f32.s32 s16, s16
vcvt.f32.s32 s17, s17
vcvt.f32.s32 s18, s18
vcvt.f32.s32 s19, s19
vcvt.f32.s32 s20, s20
vcvt.f32.s32 s21, s21
vcvt.f32.s32 s22, s22
vcvt.f32.s32 s23, s23
vmul.f32 s16, s16, s2
vstmia a2!, {s8-s11}
vstmia a2!, {s12-s15}
subs lr, lr, #8*3
bpl 3b
vcvt.f32.s32 s24, s24
vcvt.f32.s32 s25, s25
vcvt.f32.s32 s26, s26
vcvt.f32.s32 s27, s27
vcvt.f32.s32 s28, s28
vcvt.f32.s32 s29, s29
vcvt.f32.s32 s30, s30
vcvt.f32.s32 s31, s31
vmul.f32 s24, s24, s3
vstmia a2!, {s16-s19}
vstmia a2!, {s20-s23}
vstmia a2!, {s24-s27}
vstmia a2!, {s28-s31}
fmxr FPSCR, a1
vpop {s16-s31}
pop {pc}
10: @ Array is (multiple of 3) x 8 floats long
vldmia a3!, {s8-s15}
vldmia a4!, {s1,s2}
vldmia a3!, {s16-s23}
vcvt.f32.s32 s8, s8
vcvt.f32.s32 s9, s9
vcvt.f32.s32 s10, s10
vcvt.f32.s32 s11, s11
vcvt.f32.s32 s12, s12
vcvt.f32.s32 s13, s13
vcvt.f32.s32 s14, s14
vcvt.f32.s32 s15, s15
vmul.f32 s8, s8, s1
b 1b
11: @ Array is (1 + multiple of 3) x 8 floats long
vldmia a3!, {s24-s31}
vldmia a4!, {s3}
vldmia a3!, {s8-s15}
vldmia a4!, {s1}
vcvt.f32.s32 s24, s24
vcvt.f32.s32 s25, s25
vcvt.f32.s32 s26, s26
vcvt.f32.s32 s27, s27
vcvt.f32.s32 s28, s28
vcvt.f32.s32 s29, s29
vcvt.f32.s32 s30, s30
vcvt.f32.s32 s31, s31
vmul.f32 s24, s24, s3
b 2b
50:
ldr lr, =0x03070000 @ RunFast mode, short vectors of length 8, stride 1
fmrx ip, FPSCR
fmxr FPSCR, lr
51:
vldmia a3!, {s8-s15}
vldmia a4!, {s0}
vcvt.f32.s32 s8, s8
vcvt.f32.s32 s9, s9
vcvt.f32.s32 s10, s10
vcvt.f32.s32 s11, s11
vcvt.f32.s32 s12, s12
vcvt.f32.s32 s13, s13
vcvt.f32.s32 s14, s14
vcvt.f32.s32 s15, s15
vmul.f32 s8, s8, s0
subs a1, a1, #8
vstmia a2!, {s8-s11}
vstmia a2!, {s12-s15}
bne 51b
fmxr FPSCR, ip
pop {pc}
endfunc
/**
* ARM VFP optimised int32 to float conversion.
* Assume len is a multiple of 8, destination buffer is at least 4 bytes aligned
* (16 bytes alignment is best for BCM2835), little-endian.
* TODO: could be further optimised by unrolling and interleaving, as above
*/
@ void ff_int32_to_float_fmul_scalar_vfp(float *dst, const int32_t *src, float mul, int len)
function ff_int32_to_float_fmul_scalar_vfp, export=1
VFP tmp .req a4
VFP len .req a3
NOVFP tmp .req a3
NOVFP len .req a4
NOVFP vmov s0, a3
ldr tmp, =0x03070000 @ RunFast mode, short vectors of length 8, stride 1
fmrx ip, FPSCR
fmxr FPSCR, tmp
1:
vldmia a2!, {s8-s15}
vcvt.f32.s32 s8, s8
vcvt.f32.s32 s9, s9
vcvt.f32.s32 s10, s10
vcvt.f32.s32 s11, s11
vcvt.f32.s32 s12, s12
vcvt.f32.s32 s13, s13
vcvt.f32.s32 s14, s14
vcvt.f32.s32 s15, s15
vmul.f32 s8, s8, s0
subs len, len, #8
vstmia a1!, {s8-s11}
vstmia a1!, {s12-s15}
bne 1b
fmxr FPSCR, ip
bx lr
endfunc
.unreq tmp
.unreq len