Osmocom GSM/GPRS/EGPRS transceiver, originally forked from OpenBTS transceiver. For building SDR based GSM BTS with osmo-bts-trx.
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osmo-trx/Transceiver52M/arch/arm/scale_neon.S

48 lines
1.3 KiB

/*
* ARM NEON Scaling
* Copyright (C) 2013 Thomas Tsou <tom@tsou.cc>
*
* SPDX-License-Identifier: LGPL-2.1+
*
* This library 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.
*
* This library 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.
*/
.syntax unified
.text
.align 2
.global neon_scale_4n
.type neon_scale_4n, %function
neon_scale_4n:
push {r4, lr}
ldr r4, =32
vld1.64 d0, [r1]
vmov.32 s4, s1
vmov.32 s1, s0
vmov.64 d1, d0
vmov.32 s5, s4
vmov.64 d3, d2
.loop_mul_const:
vld2.32 {q2-q3}, [r0], r4
vmul.f32 q8, q0, q2
vmul.f32 q9, q1, q3
vmul.f32 q10, q0, q3
vmul.f32 q11, q1, q2
vsub.f32 q8, q8, q9
vadd.f32 q9, q10, q11
vst2.32 {q8-q9}, [r2]!
subs r3, #1
bne .loop_mul_const
pop {r4, pc}
.size neon_scale_4n, .-neon_scale_4n
.section .note.GNU-stack,"",%progbits