125 lines
4.6 KiB
C
125 lines
4.6 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 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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int_fast64_t f128M_to_i64_r_minMag( const float128_t *aPtr, bool exact )
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{
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return f128_to_i64_r_minMag( *aPtr, exact );
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}
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#else
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int_fast64_t f128M_to_i64_r_minMag( const float128_t *aPtr, bool exact )
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{
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const uint32_t *aWPtr;
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uint32_t uiA96;
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bool sign;
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int32_t exp;
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uint32_t sig96;
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int32_t shiftDist;
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uint32_t sig[4];
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uint64_t uiZ;
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union { uint64_t ui; int64_t i; } uZ;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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aWPtr = (const uint32_t *) aPtr;
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uiA96 = aWPtr[indexWordHi( 4 )];
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sign = signF128UI96( uiA96 );
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exp = expF128UI96( uiA96 );
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sig96 = fracF128UI96( uiA96 );
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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shiftDist = 0x403E - exp;
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if ( shiftDist < 0 ) goto invalid;
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if ( exact ) {
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if ( exp ) sig96 |= 0x00010000;
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sig[indexWord( 4, 3 )] = sig96;
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sig[indexWord( 4, 2 )] = aWPtr[indexWord( 4, 2 )];
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sig[indexWord( 4, 1 )] = aWPtr[indexWord( 4, 1 )];
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sig[indexWord( 4, 0 )] = aWPtr[indexWord( 4, 0 )];
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softfloat_shiftRightJam128M( sig, shiftDist + 17, sig );
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uiZ = (uint64_t) sig[indexWord( 4, 2 )]<<32 | sig[indexWord( 4, 1 )];
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if ( uiZ>>63 && (! sign || (uiZ != UINT64_C( 0x8000000000000000 ))) ) {
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goto invalid;
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}
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if ( sig[indexWordLo( 4 )] ) {
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softfloat_exceptionFlags |= softfloat_flag_inexact;
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}
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} else {
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if ( 64 <= shiftDist ) return 0;
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uiZ =
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(uint64_t) sig96<<47
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| (uint64_t) aWPtr[indexWord( 4, 2 )]<<15
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| aWPtr[indexWord( 4, 1 )]>>17;
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if ( shiftDist ) {
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uiZ |= UINT64_C( 0x8000000000000000 );
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uiZ >>= shiftDist;
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} else {
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if ( uiZ || ! sign ) goto invalid;
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uiZ |= UINT64_C( 0x8000000000000000 );
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}
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}
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if ( sign ) uiZ = -uiZ;
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uZ.ui = uiZ;
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return uZ.i;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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invalid:
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softfloat_raiseFlags( softfloat_flag_invalid );
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return
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(exp == 0x7FFF)
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&& (sig96
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|| (aWPtr[indexWord( 4, 2 )] | aWPtr[indexWord( 4, 1 )]
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| aWPtr[indexWord( 4, 0 )]))
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? i64_fromNaN
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: sign ? i64_fromNegOverflow : i64_fromPosOverflow;
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}
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#endif
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