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95 lines
3.5 KiB
C
95 lines
3.5 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 3, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014 The Regents of the University of California
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(Regents). All Rights Reserved. Redistribution and use in source and binary
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forms, with or without modification, are permitted provided that the following
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conditions are met:
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Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following two paragraphs of disclaimer.
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Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following two paragraphs of disclaimer in the
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documentation and/or other materials provided with the distribution. Neither
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the name of the Regents nor the names of its contributors may be used to
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endorse or promote products derived from this software without specific prior
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written permission.
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IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
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SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
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OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
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BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
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HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
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MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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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 "softfloat.h"
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#ifdef SOFTFLOAT_FAST_INT64
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uint_fast64_t f128M_to_ui64_r_minMag( const float128_t *aPtr, bool exact )
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{
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return f128_to_ui64_r_minMag( *aPtr, exact );
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}
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#else
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uint_fast64_t f128M_to_ui64_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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int32_t exp, shiftCount;
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uint32_t sig96, sig[4];
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uint64_t z;
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aWPtr = (const uint32_t *) aPtr;
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uiA96 = aWPtr[indexWordHi( 4 )];
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exp = expF128UI96( uiA96 );
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shiftCount = 0x403E - exp;
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if ( shiftCount < 0 ) goto invalid;
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if ( exact ) {
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sig96 = fracF128UI96( uiA96 );
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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, shiftCount + 17, sig );
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z = (uint64_t) sig[indexWord( 4, 2 )]<<32 | sig[indexWord( 4, 1 )];
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if ( signF128UI96( uiA96 ) && z ) goto invalid;
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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 <= shiftCount ) return 0;
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if ( signF128UI96( uiA96 ) ) goto invalid;
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z = UINT64_C( 0x8000000000000000 )
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| (uint64_t) fracF128UI96( uiA96 )<<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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z >>= shiftCount;
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}
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return z;
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invalid:
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softfloat_raiseFlags( softfloat_flag_invalid );
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return UINT64_C( 0xFFFFFFFFFFFFFFFF );
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}
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#endif
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