Eyck Jentzsch
dcaf5467e8
(http://www.jhauser.us/arithmetic/SoftFloat.html) with RISCV specialization and cmake build
112 lines
4.0 KiB
C
112 lines
4.0 KiB
C
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/*============================================================================
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This C source 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 The Regents of the University of
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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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#include <stdbool.h>
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#include <stdint.h>
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#include "platform.h"
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#include "internals.h"
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#include "specialize.h"
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#include "softfloat.h"
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#ifdef SOFTFLOAT_FAST_INT64
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void f64_to_extF80M( float64_t a, extFloat80_t *zPtr )
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{
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*zPtr = f64_to_extF80( a );
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}
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#else
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void f64_to_extF80M( float64_t a, extFloat80_t *zPtr )
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{
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struct extFloat80M *zSPtr;
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union ui64_f64 uA;
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uint64_t uiA;
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bool sign;
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int_fast16_t exp;
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uint64_t frac;
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struct commonNaN commonNaN;
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uint_fast16_t uiZ64;
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uint64_t uiZ0;
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struct exp16_sig64 normExpSig;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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zSPtr = (struct extFloat80M *) zPtr;
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uA.f = a;
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uiA = uA.ui;
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sign = signF64UI( uiA );
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exp = expF64UI( uiA );
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frac = fracF64UI( uiA );
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if ( exp == 0x7FF ) {
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if ( frac ) {
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softfloat_f64UIToCommonNaN( uiA, &commonNaN );
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softfloat_commonNaNToExtF80M( &commonNaN, zSPtr );
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return;
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}
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uiZ64 = packToExtF80UI64( sign, 0x7FFF );
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uiZ0 = UINT64_C( 0x8000000000000000 );
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goto uiZ;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if ( ! exp ) {
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if ( ! frac ) {
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uiZ64 = packToExtF80UI64( sign, 0 );
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uiZ0 = 0;
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goto uiZ;
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}
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normExpSig = softfloat_normSubnormalF64Sig( frac );
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exp = normExpSig.exp;
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frac = normExpSig.sig;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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uiZ64 = packToExtF80UI64( sign, exp + 0x3C00 );
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uiZ0 = UINT64_C( 0x8000000000000000 ) | frac<<11;
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uiZ:
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zSPtr->signExp = uiZ64;
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zSPtr->signif = uiZ0;
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}
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#endif
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