Eyck Jentzsch
dcaf5467e8
(http://www.jhauser.us/arithmetic/SoftFloat.html) with RISCV specialization and cmake build
408 lines
21 KiB
C
408 lines
21 KiB
C
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/*============================================================================
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This C header file is part of the SoftFloat IEEE Floating-Point Arithmetic
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Package, Release 3e, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 The Regents of the
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University of California. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=============================================================================*/
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#ifndef specialize_h
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#define specialize_h 1
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#include <stdbool.h>
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#include <stdint.h>
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#include "primitiveTypes.h"
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#include "softfloat.h"
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/*----------------------------------------------------------------------------
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| Default value for 'softfloat_detectTininess'.
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*----------------------------------------------------------------------------*/
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#define init_detectTininess softfloat_tininess_beforeRounding
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/*----------------------------------------------------------------------------
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| The values to return on conversions to 32-bit integer formats that raise an
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| invalid exception.
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*----------------------------------------------------------------------------*/
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#define ui32_fromPosOverflow 0xFFFFFFFF
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#define ui32_fromNegOverflow 0
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#define ui32_fromNaN 0
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#define i32_fromPosOverflow 0x7FFFFFFF
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#define i32_fromNegOverflow (-0x7FFFFFFF - 1)
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#define i32_fromNaN 0
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/*----------------------------------------------------------------------------
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| The values to return on conversions to 64-bit integer formats that raise an
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| invalid exception.
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*----------------------------------------------------------------------------*/
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#define ui64_fromPosOverflow UINT64_C( 0xFFFFFFFFFFFFFFFF )
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#define ui64_fromNegOverflow 0
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#define ui64_fromNaN 0
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#define i64_fromPosOverflow INT64_C( 0x7FFFFFFFFFFFFFFF )
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#define i64_fromNegOverflow (-INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1)
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#define i64_fromNaN 0
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/*----------------------------------------------------------------------------
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| "Common NaN" structure, used to transfer NaN representations from one format
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| to another.
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*----------------------------------------------------------------------------*/
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struct commonNaN { char _unused; };
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/*----------------------------------------------------------------------------
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| The bit pattern for a default generated 16-bit floating-point NaN.
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*----------------------------------------------------------------------------*/
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#define defaultNaNF16UI 0x7E00
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/*----------------------------------------------------------------------------
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| Returns true when 16-bit unsigned integer 'uiA' has the bit pattern of a
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| 16-bit floating-point signaling NaN.
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| Note: This macro evaluates its argument more than once.
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*----------------------------------------------------------------------------*/
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#define softfloat_isSigNaNF16UI( uiA ) ((((uiA) & 0x7E00) == 0x7C00) && ((uiA) & 0x01FF))
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/*----------------------------------------------------------------------------
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| Assuming 'uiA' has the bit pattern of a 16-bit floating-point NaN, converts
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| this NaN to the common NaN form, and stores the resulting common NaN at the
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| location pointed to by 'zPtr'. If the NaN is a signaling NaN, the invalid
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| exception is raised.
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*----------------------------------------------------------------------------*/
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#define softfloat_f16UIToCommonNaN( uiA, zPtr ) if ( ! ((uiA) & 0x0200) ) softfloat_raiseFlags( softfloat_flag_invalid )
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/*----------------------------------------------------------------------------
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| Converts the common NaN pointed to by 'aPtr' into a 16-bit floating-point
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| NaN, and returns the bit pattern of this value as an unsigned integer.
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*----------------------------------------------------------------------------*/
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#define softfloat_commonNaNToF16UI( aPtr ) ((uint_fast16_t) defaultNaNF16UI)
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/*----------------------------------------------------------------------------
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| Interpreting 'uiA' and 'uiB' as the bit patterns of two 16-bit floating-
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| point values, at least one of which is a NaN, returns the bit pattern of
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| the combined NaN result. If either 'uiA' or 'uiB' has the pattern of a
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| signaling NaN, the invalid exception is raised.
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*----------------------------------------------------------------------------*/
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uint_fast16_t
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softfloat_propagateNaNF16UI( uint_fast16_t uiA, uint_fast16_t uiB );
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/*----------------------------------------------------------------------------
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| The bit pattern for a default generated 32-bit floating-point NaN.
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*----------------------------------------------------------------------------*/
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#define defaultNaNF32UI 0x7FC00000
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/*----------------------------------------------------------------------------
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| Returns true when 32-bit unsigned integer 'uiA' has the bit pattern of a
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| 32-bit floating-point signaling NaN.
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| Note: This macro evaluates its argument more than once.
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*----------------------------------------------------------------------------*/
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#define softfloat_isSigNaNF32UI( uiA ) ((((uiA) & 0x7FC00000) == 0x7F800000) && ((uiA) & 0x003FFFFF))
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/*----------------------------------------------------------------------------
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| Assuming 'uiA' has the bit pattern of a 32-bit floating-point NaN, converts
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| this NaN to the common NaN form, and stores the resulting common NaN at the
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| location pointed to by 'zPtr'. If the NaN is a signaling NaN, the invalid
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| exception is raised.
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*----------------------------------------------------------------------------*/
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#define softfloat_f32UIToCommonNaN( uiA, zPtr ) if ( ! ((uiA) & 0x00400000) ) softfloat_raiseFlags( softfloat_flag_invalid )
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/*----------------------------------------------------------------------------
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| Converts the common NaN pointed to by 'aPtr' into a 32-bit floating-point
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| NaN, and returns the bit pattern of this value as an unsigned integer.
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*----------------------------------------------------------------------------*/
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#define softfloat_commonNaNToF32UI( aPtr ) ((uint_fast32_t) defaultNaNF32UI)
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/*----------------------------------------------------------------------------
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| Interpreting 'uiA' and 'uiB' as the bit patterns of two 32-bit floating-
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| point values, at least one of which is a NaN, returns the bit pattern of
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| the combined NaN result. If either 'uiA' or 'uiB' has the pattern of a
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| signaling NaN, the invalid exception is raised.
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*----------------------------------------------------------------------------*/
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uint_fast32_t
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softfloat_propagateNaNF32UI( uint_fast32_t uiA, uint_fast32_t uiB );
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/*----------------------------------------------------------------------------
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| The bit pattern for a default generated 64-bit floating-point NaN.
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*----------------------------------------------------------------------------*/
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#define defaultNaNF64UI UINT64_C( 0x7FF8000000000000 )
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/*----------------------------------------------------------------------------
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| Returns true when 64-bit unsigned integer 'uiA' has the bit pattern of a
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| 64-bit floating-point signaling NaN.
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| Note: This macro evaluates its argument more than once.
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*----------------------------------------------------------------------------*/
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#define softfloat_isSigNaNF64UI( uiA ) ((((uiA) & UINT64_C( 0x7FF8000000000000 )) == UINT64_C( 0x7FF0000000000000 )) && ((uiA) & UINT64_C( 0x0007FFFFFFFFFFFF )))
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/*----------------------------------------------------------------------------
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| Assuming 'uiA' has the bit pattern of a 64-bit floating-point NaN, converts
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| this NaN to the common NaN form, and stores the resulting common NaN at the
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| location pointed to by 'zPtr'. If the NaN is a signaling NaN, the invalid
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| exception is raised.
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*----------------------------------------------------------------------------*/
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#define softfloat_f64UIToCommonNaN( uiA, zPtr ) if ( ! ((uiA) & UINT64_C( 0x0008000000000000 )) ) softfloat_raiseFlags( softfloat_flag_invalid )
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/*----------------------------------------------------------------------------
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| Converts the common NaN pointed to by 'aPtr' into a 64-bit floating-point
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| NaN, and returns the bit pattern of this value as an unsigned integer.
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*----------------------------------------------------------------------------*/
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#define softfloat_commonNaNToF64UI( aPtr ) ((uint_fast64_t) defaultNaNF64UI)
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/*----------------------------------------------------------------------------
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| Interpreting 'uiA' and 'uiB' as the bit patterns of two 64-bit floating-
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| point values, at least one of which is a NaN, returns the bit pattern of
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| the combined NaN result. If either 'uiA' or 'uiB' has the pattern of a
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| signaling NaN, the invalid exception is raised.
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*----------------------------------------------------------------------------*/
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uint_fast64_t
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softfloat_propagateNaNF64UI( uint_fast64_t uiA, uint_fast64_t uiB );
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/*----------------------------------------------------------------------------
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| The bit pattern for a default generated 80-bit extended floating-point NaN.
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*----------------------------------------------------------------------------*/
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#define defaultNaNExtF80UI64 0x7FFF
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#define defaultNaNExtF80UI0 UINT64_C( 0xC000000000000000 )
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/*----------------------------------------------------------------------------
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| Returns true when the 80-bit unsigned integer formed from concatenating
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| 16-bit 'uiA64' and 64-bit 'uiA0' has the bit pattern of an 80-bit extended
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| floating-point signaling NaN.
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| Note: This macro evaluates its arguments more than once.
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*----------------------------------------------------------------------------*/
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#define softfloat_isSigNaNExtF80UI( uiA64, uiA0 ) ((((uiA64) & 0x7FFF) == 0x7FFF) && ! ((uiA0) & UINT64_C( 0x4000000000000000 )) && ((uiA0) & UINT64_C( 0x3FFFFFFFFFFFFFFF )))
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#ifdef SOFTFLOAT_FAST_INT64
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/*----------------------------------------------------------------------------
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| The following functions are needed only when 'SOFTFLOAT_FAST_INT64' is
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| defined.
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*----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------
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| Assuming the unsigned integer formed from concatenating 'uiA64' and 'uiA0'
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| has the bit pattern of an 80-bit extended floating-point NaN, converts
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| this NaN to the common NaN form, and stores the resulting common NaN at the
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| location pointed to by 'zPtr'. If the NaN is a signaling NaN, the invalid
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| exception is raised.
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*----------------------------------------------------------------------------*/
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#define softfloat_extF80UIToCommonNaN( uiA64, uiA0, zPtr ) if ( ! ((uiA0) & UINT64_C( 0x4000000000000000 )) ) softfloat_raiseFlags( softfloat_flag_invalid )
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/*----------------------------------------------------------------------------
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| Converts the common NaN pointed to by 'aPtr' into an 80-bit extended
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| floating-point NaN, and returns the bit pattern of this value as an unsigned
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| integer.
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*----------------------------------------------------------------------------*/
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#if defined INLINE && ! defined softfloat_commonNaNToExtF80UI
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INLINE
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struct uint128 softfloat_commonNaNToExtF80UI( const struct commonNaN *aPtr )
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{
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struct uint128 uiZ;
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uiZ.v64 = defaultNaNExtF80UI64;
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uiZ.v0 = defaultNaNExtF80UI0;
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return uiZ;
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}
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#else
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struct uint128 softfloat_commonNaNToExtF80UI( const struct commonNaN *aPtr );
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#endif
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/*----------------------------------------------------------------------------
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| Interpreting the unsigned integer formed from concatenating 'uiA64' and
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| 'uiA0' as an 80-bit extended floating-point value, and likewise interpreting
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| the unsigned integer formed from concatenating 'uiB64' and 'uiB0' as another
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| 80-bit extended floating-point value, and assuming at least on of these
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| floating-point values is a NaN, returns the bit pattern of the combined NaN
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| result. If either original floating-point value is a signaling NaN, the
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| invalid exception is raised.
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*----------------------------------------------------------------------------*/
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struct uint128
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softfloat_propagateNaNExtF80UI(
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uint_fast16_t uiA64,
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uint_fast64_t uiA0,
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uint_fast16_t uiB64,
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uint_fast64_t uiB0
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);
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/*----------------------------------------------------------------------------
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| The bit pattern for a default generated 128-bit floating-point NaN.
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*----------------------------------------------------------------------------*/
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#define defaultNaNF128UI64 UINT64_C( 0x7FFF800000000000 )
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#define defaultNaNF128UI0 UINT64_C( 0 )
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/*----------------------------------------------------------------------------
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| Returns true when the 128-bit unsigned integer formed from concatenating
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| 64-bit 'uiA64' and 64-bit 'uiA0' has the bit pattern of a 128-bit floating-
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| point signaling NaN.
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| Note: This macro evaluates its arguments more than once.
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*----------------------------------------------------------------------------*/
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#define softfloat_isSigNaNF128UI( uiA64, uiA0 ) ((((uiA64) & UINT64_C( 0x7FFF800000000000 )) == UINT64_C( 0x7FFF000000000000 )) && ((uiA0) || ((uiA64) & UINT64_C( 0x00007FFFFFFFFFFF ))))
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/*----------------------------------------------------------------------------
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| Assuming the unsigned integer formed from concatenating 'uiA64' and 'uiA0'
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| has the bit pattern of a 128-bit floating-point NaN, converts this NaN to
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| the common NaN form, and stores the resulting common NaN at the location
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| pointed to by 'zPtr'. If the NaN is a signaling NaN, the invalid exception
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| is raised.
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*----------------------------------------------------------------------------*/
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#define softfloat_f128UIToCommonNaN( uiA64, uiA0, zPtr ) if ( ! ((uiA64) & UINT64_C( 0x0000800000000000 )) ) softfloat_raiseFlags( softfloat_flag_invalid )
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/*----------------------------------------------------------------------------
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| Converts the common NaN pointed to by 'aPtr' into a 128-bit floating-point
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| NaN, and returns the bit pattern of this value as an unsigned integer.
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*----------------------------------------------------------------------------*/
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#if defined INLINE && ! defined softfloat_commonNaNToF128UI
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INLINE
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struct uint128 softfloat_commonNaNToF128UI( const struct commonNaN *aPtr )
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{
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struct uint128 uiZ;
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uiZ.v64 = defaultNaNF128UI64;
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uiZ.v0 = defaultNaNF128UI0;
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return uiZ;
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}
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#else
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struct uint128 softfloat_commonNaNToF128UI( const struct commonNaN * );
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#endif
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/*----------------------------------------------------------------------------
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| Interpreting the unsigned integer formed from concatenating 'uiA64' and
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| 'uiA0' as a 128-bit floating-point value, and likewise interpreting the
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| unsigned integer formed from concatenating 'uiB64' and 'uiB0' as another
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| 128-bit floating-point value, and assuming at least on of these floating-
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| point values is a NaN, returns the bit pattern of the combined NaN result.
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| If either original floating-point value is a signaling NaN, the invalid
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| exception is raised.
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*----------------------------------------------------------------------------*/
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struct uint128
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softfloat_propagateNaNF128UI(
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uint_fast64_t uiA64,
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uint_fast64_t uiA0,
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uint_fast64_t uiB64,
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uint_fast64_t uiB0
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);
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#else
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/*----------------------------------------------------------------------------
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| The following functions are needed only when 'SOFTFLOAT_FAST_INT64' is not
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| defined.
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*----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------
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| Assuming the 80-bit extended floating-point value pointed to by 'aSPtr' is
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| a NaN, converts this NaN to the common NaN form, and stores the resulting
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| common NaN at the location pointed to by 'zPtr'. If the NaN is a signaling
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| NaN, the invalid exception is raised.
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*----------------------------------------------------------------------------*/
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#define softfloat_extF80MToCommonNaN( aSPtr, zPtr ) if ( ! ((aSPtr)->signif & UINT64_C( 0x4000000000000000 )) ) softfloat_raiseFlags( softfloat_flag_invalid )
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/*----------------------------------------------------------------------------
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| Converts the common NaN pointed to by 'aPtr' into an 80-bit extended
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| floating-point NaN, and stores this NaN at the location pointed to by
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| 'zSPtr'.
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*----------------------------------------------------------------------------*/
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#if defined INLINE && ! defined softfloat_commonNaNToExtF80M
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INLINE
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void
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softfloat_commonNaNToExtF80M(
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const struct commonNaN *aPtr, struct extFloat80M *zSPtr )
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{
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zSPtr->signExp = defaultNaNExtF80UI64;
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zSPtr->signif = defaultNaNExtF80UI0;
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}
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#else
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void
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softfloat_commonNaNToExtF80M(
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const struct commonNaN *aPtr, struct extFloat80M *zSPtr );
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#endif
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/*----------------------------------------------------------------------------
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| Assuming at least one of the two 80-bit extended floating-point values
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| pointed to by 'aSPtr' and 'bSPtr' is a NaN, stores the combined NaN result
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| at the location pointed to by 'zSPtr'. If either original floating-point
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| value is a signaling NaN, the invalid exception is raised.
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*----------------------------------------------------------------------------*/
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void
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softfloat_propagateNaNExtF80M(
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const struct extFloat80M *aSPtr,
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const struct extFloat80M *bSPtr,
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struct extFloat80M *zSPtr
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);
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/*----------------------------------------------------------------------------
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| The bit pattern for a default generated 128-bit floating-point NaN.
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*----------------------------------------------------------------------------*/
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#define defaultNaNF128UI96 0x7FFF8000
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#define defaultNaNF128UI64 0
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#define defaultNaNF128UI32 0
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#define defaultNaNF128UI0 0
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/*----------------------------------------------------------------------------
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| Assuming the 128-bit floating-point value pointed to by 'aWPtr' is a NaN,
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| converts this NaN to the common NaN form, and stores the resulting common
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| NaN at the location pointed to by 'zPtr'. If the NaN is a signaling NaN,
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| the invalid exception is raised. Argument 'aWPtr' points to an array of
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| four 32-bit elements that concatenate in the platform's normal endian order
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| to form a 128-bit floating-point value.
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*----------------------------------------------------------------------------*/
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#define softfloat_f128MToCommonNaN( aWPtr, zPtr ) if ( ! ((aWPtr)[indexWordHi( 4 )] & UINT64_C( 0x0000800000000000 )) ) softfloat_raiseFlags( softfloat_flag_invalid )
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/*----------------------------------------------------------------------------
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| Converts the common NaN pointed to by 'aPtr' into a 128-bit floating-point
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| NaN, and stores this NaN at the location pointed to by 'zWPtr'. Argument
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| 'zWPtr' points to an array of four 32-bit elements that concatenate in the
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| platform's normal endian order to form a 128-bit floating-point value.
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*----------------------------------------------------------------------------*/
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#if defined INLINE && ! defined softfloat_commonNaNToF128M
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INLINE
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void
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softfloat_commonNaNToF128M( const struct commonNaN *aPtr, uint32_t *zWPtr )
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{
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zWPtr[indexWord( 4, 3 )] = defaultNaNF128UI96;
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zWPtr[indexWord( 4, 2 )] = defaultNaNF128UI64;
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zWPtr[indexWord( 4, 1 )] = defaultNaNF128UI32;
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zWPtr[indexWord( 4, 0 )] = defaultNaNF128UI0;
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}
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#else
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void
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softfloat_commonNaNToF128M( const struct commonNaN *aPtr, uint32_t *zWPtr );
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#endif
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/*----------------------------------------------------------------------------
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| Assuming at least one of the two 128-bit floating-point values pointed to by
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| 'aWPtr' and 'bWPtr' is a NaN, stores the combined NaN result at the location
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| pointed to by 'zWPtr'. If either original floating-point value is a
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| signaling NaN, the invalid exception is raised. Each of 'aWPtr', 'bWPtr',
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| and 'zWPtr' points to an array of four 32-bit elements that concatenate in
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| the platform's normal endian order to form a 128-bit floating-point value.
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*----------------------------------------------------------------------------*/
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void
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softfloat_propagateNaNF128M(
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const uint32_t *aWPtr, const uint32_t *bWPtr, uint32_t *zWPtr );
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#endif
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#endif
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