| |
| /*============================================================================ |
| |
| This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic |
| Package, Release 3, by John R. Hauser. |
| |
| Copyright 2011, 2012, 2013, 2014 The Regents of the University of California |
| (Regents). All Rights Reserved. Redistribution and use in source and binary |
| forms, with or without modification, are permitted provided that the following |
| conditions are met: |
| |
| Redistributions of source code must retain the above copyright notice, |
| this list of conditions, and the following two paragraphs of disclaimer. |
| Redistributions in binary form must reproduce the above copyright notice, |
| this list of conditions, and the following two paragraphs of disclaimer in the |
| documentation and/or other materials provided with the distribution. Neither |
| the name of the Regents nor the names of its contributors may be used to |
| endorse or promote products derived from this software without specific prior |
| written permission. |
| |
| IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, |
| SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING |
| OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS |
| BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED |
| TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED |
| HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE |
| MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| |
| =============================================================================*/ |
| |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include "platform.h" |
| #include "internals.h" |
| #include "specialize.h" |
| #include "softfloat.h" |
| |
| /*---------------------------------------------------------------------------- |
| | Interpreting `uiA' and `uiB' as the bit patterns of two 64-bit floating- |
| | point values, at least one of which is a NaN, returns the bit pattern of |
| | the combined NaN result. If either `uiA' or `uiB' has the pattern of a |
| | signaling NaN, the invalid exception is raised. |
| *----------------------------------------------------------------------------*/ |
| uint_fast64_t |
| softfloat_propagateNaNF64UI( uint_fast64_t uiA, uint_fast64_t uiB ) |
| { |
| bool isSigNaNA, isSigNaNB; |
| uint_fast64_t uiNonsigA, uiNonsigB, uiMagA, uiMagB; |
| |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| isSigNaNA = softfloat_isSigNaNF64UI( uiA ); |
| isSigNaNB = softfloat_isSigNaNF64UI( uiB ); |
| /*------------------------------------------------------------------------ |
| | Make NaNs non-signaling. |
| *------------------------------------------------------------------------*/ |
| uiNonsigA = uiA | UINT64_C( 0x0008000000000000 ); |
| uiNonsigB = uiB | UINT64_C( 0x0008000000000000 ); |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| if ( isSigNaNA | isSigNaNB ) { |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| if ( isSigNaNA ) { |
| if ( isSigNaNB ) goto returnLargerMag; |
| return isNaNF64UI( uiB ) ? uiNonsigB : uiNonsigA; |
| } else { |
| return isNaNF64UI( uiA ) ? uiNonsigA : uiNonsigB; |
| } |
| } |
| returnLargerMag: |
| uiMagA = uiNonsigA & UINT64_C( 0x7FFFFFFFFFFFFFFF ); |
| uiMagB = uiNonsigB & UINT64_C( 0x7FFFFFFFFFFFFFFF ); |
| if ( uiMagA < uiMagB ) return uiNonsigB; |
| if ( uiMagB < uiMagA ) return uiNonsigA; |
| return (uiNonsigA < uiNonsigB) ? uiNonsigA : uiNonsigB; |
| |
| } |
| |