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/* Copyright (C) 2010-2020 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (float_to_s16_neon.S).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#if defined(__ARM_NEON__) && defined(HAVE_ARM_NEON_ASM_OPTIMIZATIONS)
#ifndef __MACH__
.arm
#endif
.align 4
.globl convert_float_s16_asm
#ifndef __MACH__
.type convert_float_s16_asm, %function
#endif
.globl _convert_float_s16_asm
#ifndef __MACH__
.type _convert_float_s16_asm, %function
#endif
# convert_float_s16_asm(int16_t *out, const float *in, size_t samples)
convert_float_s16_asm:
_convert_float_s16_asm:
# Hacky way to get a constant of 2^15.
# ((2^4)^2)^2 * 0.5 = 2^15
vmov.f32 q8, #16.0
vmov.f32 q9, #0.5
vmul.f32 q8, q8, q8
vmul.f32 q8, q8, q8
vmul.f32 q8, q8, q9
1:
# Preload here?
vld1.f32 {q0-q1}, [r1]!
vmul.f32 q0, q0, q8
vmul.f32 q1, q1, q8
vcvt.s32.f32 q0, q0
vcvt.s32.f32 q1, q1
vqmovn.s32 d4, q0
vqmovn.s32 d5, q1
vst1.f32 {d4-d5}, [r0]!
# Guaranteed to get samples in multiples of 8.
subs r2, r2, #8
bne 1b
bx lr
#endif
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