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https://github.com/openhwgroup/cvw
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118 lines
4.3 KiB
C
118 lines
4.3 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 The Regents of the University of California.
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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_f128M( float64_t a, float128_t *zPtr )
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{
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*zPtr = f64_to_f128( a );
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}
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#else
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void f64_to_f128M( float64_t a, float128_t *zPtr )
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{
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uint32_t *zWPtr;
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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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uint32_t uiZ96;
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struct exp16_sig64 normExpSig;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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zWPtr = (uint32_t *) zPtr;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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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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zWPtr[indexWord( 4, 0 )] = 0;
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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_commonNaNToF128M( &commonNaN, zWPtr );
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return;
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}
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uiZ96 = packToF128UI96( sign, 0x7FFF, 0 );
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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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uiZ96 = packToF128UI96( sign, 0, 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 - 1;
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frac = normExpSig.sig;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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zWPtr[indexWord( 4, 1 )] = (uint32_t) frac<<28;
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frac >>= 4;
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zWPtr[indexWordHi( 4 )] = packToF128UI96( sign, exp + 0x3C00, frac>>32 );
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zWPtr[indexWord( 4, 2 )] = frac;
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return;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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uiZ:
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zWPtr[indexWord( 4, 3 )] = uiZ96;
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zWPtr[indexWord( 4, 2 )] = 0;
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zWPtr[indexWord( 4, 1 )] = 0;
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}
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#endif
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