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81 lines
3.1 KiB
C
81 lines
3.1 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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uint_fast64_t
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f128_to_ui64( float128_t a, uint_fast8_t roundingMode, bool exact )
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{
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union ui128_f128 uA;
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uint_fast64_t uiA64, uiA0;
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bool sign;
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int_fast32_t exp, shiftCount;
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uint_fast64_t sig64, sig0;
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struct uint128 sig128;
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struct uint64_extra sigExtra;
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uA.f = a;
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uiA64 = uA.ui.v64;
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uiA0 = uA.ui.v0;
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sign = signF128UI64( uiA64 );
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exp = expF128UI64( uiA64 );
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shiftCount = 0x402F - exp;
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if ( shiftCount <= 0 ) {
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if ( shiftCount < -15 ) {
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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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sig64 = fracF128UI64( uiA64 ) | UINT64_C( 0x0001000000000000 );
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sig0 = uiA0;
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if ( shiftCount ) {
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sig128 = softfloat_shortShiftLeft128( sig64, sig0, -shiftCount );
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sig64 = sig128.v64;
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sig0 = sig128.v0;
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}
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} else {
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sig64 = fracF128UI64( uiA64 );
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sig0 = uiA0;
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if ( exp ) sig64 |= UINT64_C( 0x0001000000000000 );
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sigExtra = softfloat_shiftRightJam64Extra( sig64, sig0, shiftCount );
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sig64 = sigExtra.v;
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sig0 = sigExtra.extra;
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}
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return softfloat_roundPackToUI64( sign, sig64, sig0, roundingMode, exact );
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}
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