mirror of
https://github.com/libretro/RetroArch
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65 lines
2.5 KiB
C
65 lines
2.5 KiB
C
/* Copyright (C) 2010-2020 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__) && !defined(DONT_WANT_ARM_OPTIMIZATIONS)
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#if defined(__thumb__)
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#define DECL_ARMMODE(x) " .align 2\n" " .global " x "\n" " .thumb\n" " .thumb_func\n" " .type " x ", %function\n" x ":\n"
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#else
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#define DECL_ARMMODE(x) " .align 4\n" " .global " x "\n" " .arm\n" x ":\n"
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#endif
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asm(
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DECL_ARMMODE("convert_float_s16_asm")
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DECL_ARMMODE("_convert_float_s16_asm")
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"# convert_float_s16_asm(int16_t *out, const float *in, size_t samples)\n"
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" # Hacky way to get a constant of 2^15.\n"
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" # ((2^4)^2)^2 * 0.5 = 2^15\n"
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" vmov.f32 q8, #16.0\n"
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" vmov.f32 q9, #0.5\n"
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" vmul.f32 q8, q8, q8\n"
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" vmul.f32 q8, q8, q8\n"
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" vmul.f32 q8, q8, q9\n"
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"\n"
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"1:\n"
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" # Preload here?\n"
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" vld1.f32 {q0-q1}, [r1]!\n"
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"\n"
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" vmul.f32 q0, q0, q8\n"
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" vmul.f32 q1, q1, q8\n"
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"\n"
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" vcvt.s32.f32 q0, q0\n"
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" vcvt.s32.f32 q1, q1\n"
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"\n"
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" vqmovn.s32 d4, q0\n"
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" vqmovn.s32 d5, q1\n"
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"\n"
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" vst1.f32 {d4-d5}, [r0]!\n"
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"\n"
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" # Guaranteed to get samples in multiples of 8.\n"
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" subs r2, r2, #8\n"
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" bne 1b\n"
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"\n"
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" bx lr\n"
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"\n"
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);
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#endif
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