64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/////////////////////////////////////////////////////////////////////////
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// $Id$
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2023 Stanislav Shwartsman
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// Written by Stanislav Shwartsman [sshwarts at sourceforge net]
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA B 02110-1301 USA
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//
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/////////////////////////////////////////////////////////////////////////
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#ifndef BX_BF16_HELPER
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#define BX_BF16_HELPER
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// FP32: s|eeeeeeee|mmmmmmmmmmmmmmmmmmmmmmm
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// BF16: s|eeeeeeee|mmmmmmmm
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// F16: s|eeeee|mmmmmmmmmmm
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BX_CPP_INLINE float32 convert_bfloat16_to_fp32(bfloat16 op)
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{
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return Bit32u(op) << 16;
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}
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#include "fpu/softfloat-specialize.h"
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BX_CPP_INLINE bfloat16 convert_ne_fp32_to_bfloat16(float32 op)
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{
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float_class_t op_class = float32_class(op);
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switch(op_class) {
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case float_zero:
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case float_denormal:
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return (op >> 16) & 0x8000; // sign preserving zero (denormal go to zero)
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case float_negative_inf:
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case float_positive_inf:
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return op >> 16;
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case float_SNaN:
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case float_QNaN:
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return (op >> 16) | 0x40; // truncate and set msb of the mantisa, force qnan
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case float_normalized:
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break;
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}
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Bit32u rounding_bias = 0x7FFF + ((op >> 16) & 0x1);
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return (op + rounding_bias) >> 16;
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}
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#endif
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