132 lines
4.4 KiB
C
132 lines
4.4 KiB
C
/* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* 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
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* 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,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Copyright:
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* 2023 Yi-Yen Chung <eric681@andestech.com> (Copyright owned by Andes Technology)
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*/
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#include "hedley.h"
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#include "simde-common.h"
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#include "simde-detect-clang.h"
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#if !defined(SIMDE_BFLOAT16_H)
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#define SIMDE_BFLOAT16_H
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HEDLEY_DIAGNOSTIC_PUSH
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SIMDE_DISABLE_UNWANTED_DIAGNOSTICS
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SIMDE_BEGIN_DECLS_
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/* This implementations is based upon simde-f16.h */
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/* Portable version which should work on pretty much any compiler.
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* Obviously you can't rely on compiler support for things like
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* conversion to/from 32-bit floats, so make sure you always use the
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* functions and macros in this file!
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*/
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#define SIMDE_BFLOAT16_API_PORTABLE 1
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#define SIMDE_BFLOAT16_API_BF16 2
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#if !defined(SIMDE_BFLOAT16_API)
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#if defined(SIMDE_ARM_NEON_BF16)
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#define SIMDE_BFLOAT16_API SIMDE_BFLOAT16_API_BF16
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#else
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#define SIMDE_BFLOAT16_API SIMDE_BFLOAT16_API_PORTABLE
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#endif
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#endif
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#if SIMDE_BFLOAT16_API == SIMDE_BFLOAT16_API_BF16
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#include <arm_bf16.h>
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typedef __bf16 simde_bfloat16;
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#elif SIMDE_BFLOAT16_API == SIMDE_BFLOAT16_API_PORTABLE
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typedef struct { uint16_t value; } simde_bfloat16;
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#else
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#error No 16-bit floating point API.
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#endif
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/* Conversion -- convert between single-precision and brain half-precision
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* floats. */
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static HEDLEY_ALWAYS_INLINE HEDLEY_CONST
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simde_bfloat16
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simde_bfloat16_from_float32 (simde_float32 value) {
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#if defined(SIMDE_ARM_NEON_A32V8_NATIVE) && defined(SIMDE_ARM_NEON_BF16)
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return vcvth_bf16_f32(value);
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#else
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simde_bfloat16 res;
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char* src = HEDLEY_REINTERPRET_CAST(char*, &value);
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// rounding to nearest bfloat16
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// If the 17th bit of value is 1, set the rounding to 1.
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uint8_t rounding = 0;
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#if SIMDE_ENDIAN_ORDER == SIMDE_ENDIAN_LITTLE
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if (src[1] & UINT8_C(0x80)) rounding = 1;
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src[2] = HEDLEY_STATIC_CAST(char, (HEDLEY_STATIC_CAST(uint8_t, src[2]) + rounding));
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simde_memcpy(&res, src+2, sizeof(res));
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#else
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if (src[2] & UINT8_C(0x80)) rounding = 1;
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src[1] = HEDLEY_STATIC_CAST(char, (HEDLEY_STATIC_CAST(uint8_t, src[1]) + rounding));
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simde_memcpy(&res, src, sizeof(res));
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#endif
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return res;
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#endif
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}
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static HEDLEY_ALWAYS_INLINE HEDLEY_CONST
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simde_float32
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simde_bfloat16_to_float32 (simde_bfloat16 value) {
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#if defined(SIMDE_ARM_NEON_A32V8_NATIVE) && defined(SIMDE_ARM_NEON_BF16)
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return vcvtah_f32_bf16(value);
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#else
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simde_float32 res = 0.0;
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char* _res = HEDLEY_REINTERPRET_CAST(char*, &res);
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#if SIMDE_ENDIAN_ORDER == SIMDE_ENDIAN_LITTLE
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simde_memcpy(_res+2, &value, sizeof(value));
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#else
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simde_memcpy(_res, &value, sizeof(value));
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#endif
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return res;
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#endif
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}
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SIMDE_DEFINE_CONVERSION_FUNCTION_(simde_uint16_as_bfloat16, simde_bfloat16, uint16_t)
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#define SIMDE_NANBF simde_uint16_as_bfloat16(0xFFC1) // a quiet Not-a-Number
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#define SIMDE_INFINITYBF simde_uint16_as_bfloat16(0x7F80)
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#define SIMDE_NINFINITYBF simde_uint16_as_bfloat16(0xFF80)
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#define SIMDE_BFLOAT16_VALUE(value) simde_bfloat16_from_float32(SIMDE_FLOAT32_C(value))
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#if !defined(simde_isinfbf) && defined(simde_math_isinff)
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#define simde_isinfbf(a) simde_math_isinff(simde_bfloat16_to_float32(a))
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#endif
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#if !defined(simde_isnanbf) && defined(simde_math_isnanf)
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#define simde_isnanbf(a) simde_math_isnanf(simde_bfloat16_to_float32(a))
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#endif
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SIMDE_END_DECLS_
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HEDLEY_DIAGNOSTIC_POP
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#endif /* !defined(SIMDE_BFLOAT16_H) */
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