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68 lines
2.6 KiB
C
68 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 <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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float32_t i64_to_f32( int64_t a )
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{
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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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union ui32_f32 u;
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uint_fast32_t sig;
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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 ) - 40;
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if ( 0 <= shiftCount ) {
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u.ui =
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a ? packToF32UI(
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sign, 0x95 - shiftCount, (uint_fast32_t) absA<<shiftCount )
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: 0;
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return u.f;
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} else {
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shiftCount += 7;
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sig =
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(shiftCount < 0)
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? softfloat_shortShiftRightJam64( absA, -shiftCount )
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: (uint_fast32_t) absA<<shiftCount;
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return softfloat_roundPackToF32( sign, 0x9C - shiftCount, sig );
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}
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}
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