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https://github.com/ekeeke/Genesis-Plus-GX.git
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77 lines
2.4 KiB
ArmAsm
77 lines
2.4 KiB
ArmAsm
/* 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 (s16_to_float_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_s16_float_asm
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#ifndef __MACH__
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.type convert_s16_float_asm, %function
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#endif
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.globl _convert_s16_float_asm
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#ifndef __MACH__
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.type _convert_s16_float_asm, %function
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#endif
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# convert_s16_float_asm(float *out, const int16_t *in, size_t samples, const float *gain)
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convert_s16_float_asm:
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_convert_s16_float_asm:
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# Hacky way to get a constant of 2^-15.
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# Might be faster to just load a constant from memory.
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# It's just done once however ...
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vmov.f32 q8, #0.25
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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, q8
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vadd.f32 q8, q8, q8
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# Apply gain
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vld1.f32 {d6[0]}, [r3]
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vmul.f32 q8, q8, d6[0]
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1:
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# Preload here?
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vld1.s16 {q0}, [r1]!
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# Widen to 32-bit
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vmovl.s16 q1, d0
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vmovl.s16 q2, d1
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# Convert to float
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vcvt.f32.s32 q1, q1
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vcvt.f32.s32 q2, q2
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vmul.f32 q1, q1, q8
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vmul.f32 q2, q2, q8
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vst1.f32 {q1-q2}, [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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