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https://github.com/openhwgroup/cvw
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79 lines
3.0 KiB
C
79 lines
3.0 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 3e, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of
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California. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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int
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softfloat_shiftNormSigF128M(
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const uint32_t *wPtr, uint_fast8_t shiftDist, uint32_t *sigPtr )
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{
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uint32_t wordSig;
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int32_t exp;
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uint32_t leadingBit;
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wordSig = wPtr[indexWordHi( 4 )];
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exp = expF128UI96( wordSig );
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if ( exp ) {
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softfloat_shortShiftLeft128M( wPtr, shiftDist, sigPtr );
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leadingBit = 0x00010000<<shiftDist;
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sigPtr[indexWordHi( 4 )] =
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(sigPtr[indexWordHi( 4 )] & (leadingBit - 1)) | leadingBit;
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} else {
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exp = 16;
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wordSig &= 0x7FFFFFFF;
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if ( ! wordSig ) {
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exp = -16;
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wordSig = wPtr[indexWord( 4, 2 )];
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if ( ! wordSig ) {
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exp = -48;
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wordSig = wPtr[indexWord( 4, 1 )];
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if ( ! wordSig ) {
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wordSig = wPtr[indexWord( 4, 0 )];
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if ( ! wordSig ) return -128;
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exp = -80;
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}
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}
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}
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exp -= softfloat_countLeadingZeros32( wordSig );
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softfloat_shiftLeft128M( wPtr, 1 - exp + shiftDist, sigPtr );
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}
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return exp;
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}
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