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/mult_neon.S

40 lines
1.2 KiB

/*
* NEON complex multiplication
* Copyright (C) 2012,2013 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_cmplx_mul_4n
.type neon_cmplx_mul_4n, %function
neon_cmplx_mul_4n:
vpush {q4-q7}
.loop_mul:
vld2.32 {q0-q1}, [r1]!
vld2.32 {q2-q3}, [r2]!
vmul.f32 q4, q0, q2
vmul.f32 q5, q1, q3
vmul.f32 q6, q0, q3
vmul.f32 q7, q2, q1
vsub.f32 q8, q4, q5
vadd.f32 q9, q6, q7
vst2.32 {q8-q9}, [r0]!
subs r3, #1
bne .loop_mul
vpop {q4-q7}
bx lr
.size neon_cmplx_mul_4n, .-neon_cmplx_mul_4n
.section .note.GNU-stack,"",%progbits