| |
| /*============================================================================ |
| |
| 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 the unsigned integer formed from concatenating `uiA64' and |
| | `uiA0' as an 80-bit extended floating-point value, and likewise interpreting |
| | the unsigned integer formed from concatenating `uiB64' and `uiB0' as another |
| | 80-bit extended floating-point value, and assuming at least on of these |
| | floating-point values is a NaN, returns the bit pattern of the combined NaN |
| | result. If either original floating-point value is a signaling NaN, the |
| | invalid exception is raised. |
| *----------------------------------------------------------------------------*/ |
| struct uint128 |
| softfloat_propagateNaNExtF80UI( |
| uint_fast16_t uiA64, |
| uint_fast64_t uiA0, |
| uint_fast16_t uiB64, |
| uint_fast64_t uiB0 |
| ) |
| { |
| bool isSigNaNA, isSigNaNB; |
| uint_fast64_t uiNonsigA0, uiNonsigB0; |
| uint_fast16_t uiMagA64, uiMagB64; |
| struct uint128 uiZ; |
| |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| isSigNaNA = softfloat_isSigNaNExtF80UI( uiA64, uiA0 ); |
| isSigNaNB = softfloat_isSigNaNExtF80UI( uiB64, uiB0 ); |
| /*------------------------------------------------------------------------ |
| | Make NaNs non-signaling. |
| *------------------------------------------------------------------------*/ |
| uiNonsigA0 = uiA0 | UINT64_C( 0xC000000000000000 ); |
| uiNonsigB0 = uiB0 | UINT64_C( 0xC000000000000000 ); |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| if ( isSigNaNA | isSigNaNB ) { |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| if ( isSigNaNA ) { |
| if ( isSigNaNB ) goto returnLargerMag; |
| if ( isNaNExtF80UI( uiB64, uiB0 ) ) goto returnB; |
| goto returnA; |
| } else { |
| if ( isNaNExtF80UI( uiA64, uiA0 ) ) goto returnA; |
| goto returnB; |
| } |
| } |
| returnLargerMag: |
| uiMagA64 = uiA64 & 0x7FFF; |
| uiMagB64 = uiB64 & 0x7FFF; |
| if ( uiMagA64 < uiMagB64 ) goto returnB; |
| if ( uiMagB64 < uiMagA64 ) goto returnA; |
| if ( uiNonsigA0 < uiNonsigB0 ) goto returnB; |
| if ( uiNonsigB0 < uiNonsigA0 ) goto returnA; |
| if ( uiA64 < uiB64 ) goto returnA; |
| returnB: |
| uiZ.v64 = uiB64; |
| uiZ.v0 = uiNonsigB0; |
| return uiZ; |
| returnA: |
| uiZ.v64 = uiA64; |
| uiZ.v0 = uiNonsigA0; |
| return uiZ; |
| |
| } |
| |