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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 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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int_fast32_t extF80M_to_i32_r_minMag( const extFloat80_t *aPtr, bool exact )
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{
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return extF80_to_i32_r_minMag( *aPtr, exact );
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}
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#else
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int_fast32_t extF80M_to_i32_r_minMag( const extFloat80_t *aPtr, bool exact )
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{
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const struct extFloat80M *aSPtr;
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uint_fast16_t uiA64;
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int32_t exp;
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uint64_t sig;
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int32_t shiftCount;
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bool raiseInexact;
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int32_t z;
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uint64_t shiftedSig;
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uint32_t absZ;
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union { uint32_t ui; int32_t i; } u;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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aSPtr = (const struct extFloat80M *) aPtr;
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uiA64 = aSPtr->signExp;
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exp = expExtF80UI64( uiA64 );
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sig = aSPtr->signif;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if ( ! sig && (exp != 0x7FFF) ) return 0;
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shiftCount = 0x403E - exp;
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if ( 64 <= shiftCount ) {
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raiseInexact = exact;
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z = 0;
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} else {
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raiseInexact = false;
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if ( shiftCount < 0 ) {
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if ( sig>>32 || (shiftCount <= -31) ) goto invalid;
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shiftedSig = (uint64_t) (uint32_t) sig<<-shiftCount;
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if ( shiftedSig>>32 ) goto invalid;
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absZ = shiftedSig;
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} else {
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shiftedSig = sig;
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if ( shiftCount ) shiftedSig >>= shiftCount;
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if ( shiftedSig>>32 ) goto invalid;
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absZ = shiftedSig;
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if ( exact && shiftCount ) {
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raiseInexact = ((uint64_t) absZ<<shiftCount != sig);
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}
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}
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if ( signExtF80UI64( uiA64 ) ) {
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if ( 0x80000000 < absZ ) goto invalid;
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u.ui = -absZ;
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z = u.i;
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} else {
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if ( 0x80000000 <= absZ ) goto invalid;
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z = absZ;
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}
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}
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if ( raiseInexact ) softfloat_exceptionFlags |= softfloat_flag_inexact;
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return z;
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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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! signExtF80UI64( uiA64 )
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|| ((exp == 0x7FFF) && (sig & UINT64_C( 0x7FFFFFFFFFFFFFFF )))
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? 0x7FFFFFFF
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: -0x7FFFFFFF - 1;
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}
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#endif
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