2024-07-29 15:33:50 +02:00
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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 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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float128_t
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softfloat_normRoundPackToF128(
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bool sign, int_fast32_t exp, uint_fast64_t sig64, uint_fast64_t sig0 )
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{
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int_fast8_t shiftDist;
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struct uint128 sig128;
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union ui128_f128 uZ;
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uint_fast64_t sigExtra;
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struct uint128_extra sig128Extra;
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if ( ! sig64 ) {
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exp -= 64;
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sig64 = sig0;
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sig0 = 0;
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}
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shiftDist = softfloat_countLeadingZeros64( sig64 ) - 15;
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exp -= shiftDist;
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if ( 0 <= shiftDist ) {
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if ( shiftDist ) {
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sig128 = softfloat_shortShiftLeft128( sig64, sig0, shiftDist );
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sig64 = sig128.v64;
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sig0 = sig128.v0;
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}
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if ( (uint32_t) exp < 0x7FFD ) {
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uZ.ui.v64 = packToF128UI64( sign, sig64 | sig0 ? exp : 0, sig64 );
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uZ.ui.v0 = sig0;
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return uZ.f;
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}
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sigExtra = 0;
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} else {
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sig128Extra =
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softfloat_shortShiftRightJam128Extra( sig64, sig0, 0, -shiftDist );
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sig64 = sig128Extra.v.v64;
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sig0 = sig128Extra.v.v0;
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sigExtra = sig128Extra.extra;
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}
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return softfloat_roundPackToF128( sign, exp, sig64, sig0, sigExtra );
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}
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