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