| |
| /*============================================================================ |
| |
| 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" |
| |
| /*---------------------------------------------------------------------------- |
| | 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 )]; |
| |
| } |
| |