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