| |
| /*============================================================================ |
| |
| 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 80-bit extended floating-point values |
| | pointed to by `aSPtr' and `bSPtr' is a NaN, stores the combined NaN result |
| | at the location pointed to by `zSPtr'. If either original floating-point |
| | value is a signaling NaN, the invalid exception is raised. |
| *----------------------------------------------------------------------------*/ |
| void |
| softfloat_propagateNaNExtF80M( |
| const struct extFloat80M *aSPtr, |
| const struct extFloat80M *bSPtr, |
| struct extFloat80M *zSPtr |
| ) |
| { |
| bool isSigNaNA; |
| const struct extFloat80M *sPtr; |
| bool isSigNaNB; |
| uint_fast16_t uiB64; |
| uint64_t uiB0; |
| uint_fast16_t uiA64; |
| uint64_t uiA0; |
| uint_fast16_t uiMagA64, uiMagB64; |
| |
| isSigNaNA = extF80M_isSignalingNaN( (const extFloat80_t *) aSPtr ); |
| sPtr = aSPtr; |
| if ( ! bSPtr ) { |
| if ( isSigNaNA ) softfloat_raiseFlags( softfloat_flag_invalid ); |
| goto copy; |
| } |
| isSigNaNB = extF80M_isSignalingNaN( (const extFloat80_t *) bSPtr ); |
| if ( isSigNaNA | isSigNaNB ) { |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| if ( isSigNaNA ) { |
| uiB64 = bSPtr->signExp; |
| if ( isSigNaNB ) goto returnLargerUIMag; |
| uiB0 = bSPtr->signif; |
| if ( isNaNExtF80UI( uiB64, uiB0 ) ) goto copyB; |
| goto copy; |
| } else { |
| uiA64 = aSPtr->signExp; |
| uiA0 = aSPtr->signif; |
| if ( isNaNExtF80UI( uiA64, uiA0 ) ) goto copy; |
| goto copyB; |
| } |
| } |
| uiB64 = bSPtr->signExp; |
| returnLargerUIMag: |
| uiA64 = aSPtr->signExp; |
| uiMagA64 = uiA64 & 0x7FFF; |
| uiMagB64 = uiB64 & 0x7FFF; |
| if ( uiMagA64 < uiMagB64 ) goto copyB; |
| if ( uiMagB64 < uiMagA64 ) goto copy; |
| uiA0 = aSPtr->signif; |
| uiB0 = bSPtr->signif; |
| if ( uiA0 < uiB0 ) goto copyB; |
| if ( uiB0 < uiA0 ) goto copy; |
| if ( uiA64 < uiB64 ) goto copy; |
| copyB: |
| sPtr = bSPtr; |
| copy: |
| zSPtr->signExp = sPtr->signExp; |
| zSPtr->signif = sPtr->signif | UINT64_C( 0xC000000000000000 ); |
| |
| } |
| |