mirror of
https://github.com/libretro/RetroArch.git
synced 2024-11-25 00:49:47 +00:00
87 lines
2.1 KiB
ArmAsm
87 lines
2.1 KiB
ArmAsm
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2012 - Hans-Kristian Arntzen
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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.arm
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.align 4
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.global audio_convert_s16_float_asm
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# audio_convert_s16_float_asm(float *out, const int16_t *in, size_t samples)
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audio_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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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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.align 4
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.global audio_convert_float_s16_asm
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# audio_convert_float_s16_asm(int16_t *out, const float *in, size_t samples)
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audio_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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