Eyck Jentzsch
dcaf5467e8
(http://www.jhauser.us/arithmetic/SoftFloat.html) with RISCV specialization and cmake build
77 lines
3.3 KiB
C
77 lines
3.3 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 The Regents of the University of California.
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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 <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 "specialize.h"
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#include "softfloat.h"
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/*----------------------------------------------------------------------------
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| Assuming at least one of the two 128-bit floating-point values pointed to by
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| `aWPtr' and `bWPtr' is a NaN, stores the combined NaN result at the location
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| pointed to by `zWPtr'. If either original floating-point value is a
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| signaling NaN, the invalid exception is raised. Each of `aWPtr', `bWPtr',
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| and `zWPtr' points to an array of four 32-bit elements that concatenate in
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| the platform's normal endian order to form a 128-bit floating-point value.
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*----------------------------------------------------------------------------*/
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void
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softfloat_propagateNaNF128M(
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const uint32_t *aWPtr, const uint32_t *bWPtr, uint32_t *zWPtr )
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{
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bool isSigNaNA;
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const uint32_t *ptr;
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ptr = aWPtr;
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isSigNaNA = f128M_isSignalingNaN( (const float128_t *) aWPtr );
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if (
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isSigNaNA
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|| (bWPtr && f128M_isSignalingNaN( (const float128_t *) bWPtr ))
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) {
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softfloat_raiseFlags( softfloat_flag_invalid );
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if ( isSigNaNA ) goto copy;
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}
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if ( ! softfloat_isNaNF128M( aWPtr ) ) ptr = bWPtr;
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copy:
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zWPtr[indexWordHi( 4 )] = ptr[indexWordHi( 4 )] | 0x00008000;
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zWPtr[indexWord( 4, 2 )] = ptr[indexWord( 4, 2 )];
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zWPtr[indexWord( 4, 1 )] = ptr[indexWord( 4, 1 )];
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zWPtr[indexWord( 4, 0 )] = ptr[indexWord( 4, 0 )];
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}
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