| |
| /*============================================================================ |
| |
| 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 "softfloat.h" |
| |
| uint_fast64_t |
| softfloat_roundPackMToUI64( |
| bool sign, uint32_t *extSigPtr, uint_fast8_t roundingMode, bool exact ) |
| { |
| bool roundNearEven; |
| uint32_t sigExtra; |
| bool doIncrement; |
| uint64_t sig; |
| |
| roundNearEven = (roundingMode == softfloat_round_near_even); |
| sigExtra = extSigPtr[indexWordLo( 3 )]; |
| doIncrement = (0x80000000 <= sigExtra); |
| if ( ! roundNearEven && (roundingMode != softfloat_round_near_maxMag) ) { |
| doIncrement = |
| (roundingMode |
| == (sign ? softfloat_round_min : softfloat_round_max)) |
| && sigExtra; |
| } |
| sig = |
| (uint64_t) extSigPtr[indexWord( 3, 2 )]<<32 |
| | extSigPtr[indexWord( 3, 1 )]; |
| if ( doIncrement ) { |
| ++sig; |
| if ( ! sig ) goto invalid; |
| if ( ! (sigExtra & 0x7FFFFFFF) && roundNearEven ) sig &= ~1; |
| } |
| if ( sign && sig ) goto invalid; |
| if ( exact && sigExtra ) { |
| softfloat_exceptionFlags |= softfloat_flag_inexact; |
| } |
| return sig; |
| invalid: |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| return UINT64_C( 0xFFFFFFFFFFFFFFFF ); |
| |
| } |
| |