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70 lines
2.6 KiB
C
70 lines
2.6 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 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 <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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float128_t i64_to_f128( int64_t a )
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{
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uint_fast64_t uiZ64, uiZ0;
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bool sign;
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uint_fast64_t absA;
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int_fast8_t shiftCount;
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struct uint128 zSig;
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union ui128_f128 uZ;
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if ( ! a ) {
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uiZ64 = 0;
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uiZ0 = 0;
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} else {
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sign = (a < 0);
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absA = sign ? -(uint_fast64_t) a : (uint_fast64_t) a;
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shiftCount = softfloat_countLeadingZeros64( absA ) + 49;
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if ( 64 <= shiftCount ) {
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zSig.v64 = absA<<(shiftCount - 64);
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zSig.v0 = 0;
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} else {
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zSig = softfloat_shortShiftLeft128( 0, absA, shiftCount );
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}
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uiZ64 = packToF128UI64( sign, 0x406E - shiftCount, zSig.v64 );
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uiZ0 = zSig.v0;
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}
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uZ.ui.v64 = uiZ64;
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uZ.ui.v0 = uiZ0;
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return uZ.f;
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}
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