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https://github.com/ekeeke/Genesis-Plus-GX.git
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70 lines
2.2 KiB
ArmAsm
70 lines
2.2 KiB
ArmAsm
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/* Copyright (C) 2010-2017 The RetroArch team
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*
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* ---------------------------------------------------------------------------------------
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* The following license statement only applies to this file (float_to_s16_neon.S).
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* ---------------------------------------------------------------------------------------
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*
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* Permission is hereby granted, free of charge,
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* to any person obtaining a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#if defined(__ARM_NEON__)
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#ifndef __MACH__
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.arm
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#endif
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.align 4
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.globl convert_float_s16_asm
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#ifndef __MACH__
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.type convert_float_s16_asm, %function
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#endif
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.globl _convert_float_s16_asm
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#ifndef __MACH__
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.type _convert_float_s16_asm, %function
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#endif
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# convert_float_s16_asm(int16_t *out, const float *in, size_t samples)
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convert_float_s16_asm:
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_convert_float_s16_asm:
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# Hacky way to get a constant of 2^15.
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# ((2^4)^2)^2 * 0.5 = 2^15
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vmov.f32 q8, #16.0
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vmov.f32 q9, #0.5
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vmul.f32 q8, q8, q8
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vmul.f32 q8, q8, q8
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vmul.f32 q8, q8, q9
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1:
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# Preload here?
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vld1.f32 {q0-q1}, [r1]!
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vmul.f32 q0, q0, q8
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vmul.f32 q1, q1, q8
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vcvt.s32.f32 q0, q0
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vcvt.s32.f32 q1, q1
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vqmovn.s32 d4, q0
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vqmovn.s32 d5, q1
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vst1.f32 {d4-d5}, [r0]!
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# Guaranteed to get samples in multiples of 8.
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subs r2, r2, #8
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bne 1b
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bx lr
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#endif
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