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https://github.com/openhwgroup/cvw
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97 lines
3.8 KiB
C
97 lines
3.8 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, 2016, 2017 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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#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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uint_fast64_t f32_to_ui64( float32_t a, uint_fast8_t roundingMode, bool exact )
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{
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union ui32_f32 uA;
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uint_fast32_t uiA;
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bool sign;
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int_fast16_t exp;
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uint_fast32_t sig;
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int_fast16_t shiftDist;
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#ifdef SOFTFLOAT_FAST_INT64
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uint_fast64_t sig64, extra;
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struct uint64_extra sig64Extra;
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#else
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uint32_t extSig[3];
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#endif
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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 = signF32UI( uiA );
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exp = expF32UI( uiA );
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sig = fracF32UI( uiA );
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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shiftDist = 0xBE - exp;
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if ( shiftDist < 0 ) {
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softfloat_raiseFlags( softfloat_flag_invalid );
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return
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(exp == 0xFF) && sig ? ui64_fromNaN
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: sign ? ui64_fromNegOverflow : ui64_fromPosOverflow;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if ( exp ) sig |= 0x00800000;
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#ifdef SOFTFLOAT_FAST_INT64
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sig64 = (uint_fast64_t) sig<<40;
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extra = 0;
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if ( shiftDist ) {
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sig64Extra = softfloat_shiftRightJam64Extra( sig64, 0, shiftDist );
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sig64 = sig64Extra.v;
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extra = sig64Extra.extra;
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}
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return softfloat_roundToUI64( sign, sig64, extra, roundingMode, exact );
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#else
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extSig[indexWord( 3, 2 )] = sig<<8;
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extSig[indexWord( 3, 1 )] = 0;
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extSig[indexWord( 3, 0 )] = 0;
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if ( shiftDist ) softfloat_shiftRightJam96M( extSig, shiftDist, extSig );
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return softfloat_roundMToUI64( sign, extSig, roundingMode, exact );
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#endif
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}
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