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71 lines
2.7 KiB
C
71 lines
2.7 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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void
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softfloat_normRoundPackMToF128M(
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bool sign, int32_t exp, uint32_t *extSigPtr, uint32_t *zWPtr )
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{
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const uint32_t *ptr;
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int_fast16_t shiftCount;
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uint32_t wordSig;
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ptr = extSigPtr + indexWordHi( 5 );
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shiftCount = 0;
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for (;;) {
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wordSig = *ptr;
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if ( wordSig ) break;
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shiftCount += 32;
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if ( 160 <= shiftCount ) {
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zWPtr[indexWordHi( 4 )] = packToF128UI96( sign, 0, 0 );
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zWPtr[indexWord( 4, 2 )] = 0;
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zWPtr[indexWord( 4, 1 )] = 0;
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zWPtr[indexWord( 4, 0 )] = 0;
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return;
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}
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ptr -= wordIncr;
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}
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shiftCount += softfloat_countLeadingZeros32( wordSig ) - 15;
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if ( shiftCount ) {
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exp -= shiftCount;
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softfloat_shiftLeft160M( extSigPtr, shiftCount, extSigPtr );
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}
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softfloat_roundPackMToF128M( sign, exp, extSigPtr, zWPtr );
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}
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