| |
| /*============================================================================ |
| |
| 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" |
| |
| #ifdef SOFTFLOAT_FAST_INT64 |
| |
| uint_fast32_t extF80M_to_ui32_r_minMag( const extFloat80_t *aPtr, bool exact ) |
| { |
| |
| return extF80_to_ui32_r_minMag( *aPtr, exact ); |
| |
| } |
| |
| #else |
| |
| uint_fast32_t extF80M_to_ui32_r_minMag( const extFloat80_t *aPtr, bool exact ) |
| { |
| const struct extFloat80M *aSPtr; |
| uint_fast16_t uiA64; |
| int32_t exp; |
| uint64_t sig; |
| int32_t shiftCount; |
| bool sign; |
| uint64_t shiftedSig; |
| uint32_t z; |
| |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| aSPtr = (const struct extFloat80M *) aPtr; |
| uiA64 = aSPtr->signExp; |
| exp = expExtF80UI64( uiA64 ); |
| sig = aSPtr->signif; |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| if ( ! sig && (exp != 0x7FFF) ) return 0; |
| shiftCount = 0x403E - exp; |
| if ( 64 <= shiftCount ) { |
| if ( exact ) softfloat_exceptionFlags |= softfloat_flag_inexact; |
| return 0; |
| } |
| sign = signExtF80UI64( uiA64 ); |
| if ( shiftCount < 0 ) { |
| if ( sign || sig>>32 || (shiftCount <= -31) ) goto invalid; |
| shiftedSig = (uint64_t) (uint32_t) sig<<-shiftCount; |
| if ( shiftedSig>>32 ) goto invalid; |
| z = shiftedSig; |
| } else { |
| shiftedSig = sig; |
| if ( shiftCount ) shiftedSig >>= shiftCount; |
| if ( shiftedSig>>32 ) goto invalid; |
| z = shiftedSig; |
| if ( sign && z ) goto invalid; |
| if ( exact && shiftCount && ((uint64_t) z<<shiftCount != sig) ) { |
| softfloat_exceptionFlags |= softfloat_flag_inexact; |
| } |
| } |
| return z; |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| invalid: |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| return 0xFFFFFFFF; |
| |
| } |
| |
| #endif |
| |