| |
| /*============================================================================ |
| |
| This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic |
| Package, Release 3d, by John R. Hauser. |
| |
| Copyright 2011, 2012, 2013, 2014 The Regents of the University of California. |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are met: |
| |
| 1. Redistributions of source code must retain the above copyright notice, |
| this list of conditions, and the following disclaimer. |
| |
| 2. Redistributions in binary form must reproduce the above copyright notice, |
| this list of conditions, and the following disclaimer in the documentation |
| and/or other materials provided with the distribution. |
| |
| 3. Neither the name of the University nor the names of its contributors may |
| be used to endorse or promote products derived from this software without |
| specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY |
| EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE |
| DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY |
| DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| =============================================================================*/ |
| |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include "platform.h" |
| #include "internals.h" |
| #include "specialize.h" |
| #include "softfloat.h" |
| |
| /*---------------------------------------------------------------------------- |
| | Assuming at least one of the two 128-bit floating-point values pointed to by |
| | `aWPtr' and `bWPtr' is a NaN, stores the combined NaN result at the location |
| | pointed to by `zWPtr'. If either original floating-point value is a |
| | signaling NaN, the invalid exception is raised. Each of `aWPtr', `bWPtr', |
| | and `zWPtr' points to an array of four 32-bit elements that concatenate in |
| | the platform's normal endian order to form a 128-bit floating-point value. |
| *----------------------------------------------------------------------------*/ |
| void |
| softfloat_propagateNaNF128M( |
| const uint32_t *aWPtr, const uint32_t *bWPtr, uint32_t *zWPtr ) |
| { |
| bool isSigNaNA; |
| const uint32_t *ptr; |
| bool isSigNaNB; |
| uint32_t uiA96, uiB96, wordMagA, wordMagB; |
| |
| isSigNaNA = f128M_isSignalingNaN( (const float128_t *) aWPtr ); |
| ptr = aWPtr; |
| if ( ! bWPtr ) { |
| if ( isSigNaNA ) softfloat_raiseFlags( softfloat_flag_invalid ); |
| goto copy; |
| } |
| isSigNaNB = f128M_isSignalingNaN( (const float128_t *) bWPtr ); |
| if ( isSigNaNA | isSigNaNB ) { |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| if ( isSigNaNA ) { |
| if ( isSigNaNB ) goto returnLargerUIMag; |
| if ( softfloat_isNaNF128M( bWPtr ) ) goto copyB; |
| goto copy; |
| } else { |
| if ( softfloat_isNaNF128M( aWPtr ) ) goto copy; |
| goto copyB; |
| } |
| } |
| returnLargerUIMag: |
| uiA96 = aWPtr[indexWordHi( 4 )]; |
| uiB96 = bWPtr[indexWordHi( 4 )]; |
| wordMagA = uiA96 & 0x7FFFFFFF; |
| wordMagB = uiB96 & 0x7FFFFFFF; |
| if ( wordMagA < wordMagB ) goto copyB; |
| if ( wordMagB < wordMagA ) goto copy; |
| wordMagA = aWPtr[indexWord( 4, 2 )]; |
| wordMagB = bWPtr[indexWord( 4, 2 )]; |
| if ( wordMagA < wordMagB ) goto copyB; |
| if ( wordMagB < wordMagA ) goto copy; |
| wordMagA = aWPtr[indexWord( 4, 1 )]; |
| wordMagB = bWPtr[indexWord( 4, 1 )]; |
| if ( wordMagA < wordMagB ) goto copyB; |
| if ( wordMagB < wordMagA ) goto copy; |
| wordMagA = aWPtr[indexWord( 4, 0 )]; |
| wordMagB = bWPtr[indexWord( 4, 0 )]; |
| if ( wordMagA < wordMagB ) goto copyB; |
| if ( wordMagB < wordMagA ) goto copy; |
| if ( uiA96 < uiB96 ) goto copy; |
| copyB: |
| ptr = bWPtr; |
| copy: |
| zWPtr[indexWordHi( 4 )] = ptr[indexWordHi( 4 )] | 0x00008000; |
| zWPtr[indexWord( 4, 2 )] = ptr[indexWord( 4, 2 )]; |
| zWPtr[indexWord( 4, 1 )] = ptr[indexWord( 4, 1 )]; |
| zWPtr[indexWord( 4, 0 )] = ptr[indexWord( 4, 0 )]; |
| |
| } |
| |