| |
| /*============================================================================ |
| |
| 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_fast64_t f128M_to_ui64_r_minMag( const float128_t *aPtr, bool exact ) |
| { |
| |
| return f128_to_ui64_r_minMag( *aPtr, exact ); |
| |
| } |
| |
| #else |
| |
| uint_fast64_t f128M_to_ui64_r_minMag( const float128_t *aPtr, bool exact ) |
| { |
| const uint32_t *aWPtr; |
| uint32_t uiA96; |
| int32_t exp, shiftCount; |
| uint32_t sig96, sig[4]; |
| uint64_t z; |
| |
| aWPtr = (const uint32_t *) aPtr; |
| uiA96 = aWPtr[indexWordHi( 4 )]; |
| exp = expF128UI96( uiA96 ); |
| shiftCount = 0x403E - exp; |
| if ( shiftCount < 0 ) goto invalid; |
| if ( exact ) { |
| sig96 = fracF128UI96( uiA96 ); |
| if ( exp ) sig96 |= 0x00010000; |
| sig[indexWord( 4, 3 )] = sig96; |
| sig[indexWord( 4, 2 )] = aWPtr[indexWord( 4, 2 )]; |
| sig[indexWord( 4, 1 )] = aWPtr[indexWord( 4, 1 )]; |
| sig[indexWord( 4, 0 )] = aWPtr[indexWord( 4, 0 )]; |
| softfloat_shiftRightJam128M( sig, shiftCount + 17, sig ); |
| z = (uint64_t) sig[indexWord( 4, 2 )]<<32 | sig[indexWord( 4, 1 )]; |
| if ( signF128UI96( uiA96 ) && z ) goto invalid; |
| if ( sig[indexWordLo( 4 )] ) { |
| softfloat_exceptionFlags |= softfloat_flag_inexact; |
| } |
| } else { |
| if ( 64 <= shiftCount ) return 0; |
| if ( signF128UI96( uiA96 ) ) goto invalid; |
| z = UINT64_C( 0x8000000000000000 ) |
| | (uint64_t) fracF128UI96( uiA96 )<<47 |
| | (uint64_t) aWPtr[indexWord( 4, 2 )]<<15 |
| | aWPtr[indexWord( 4, 1 )]>>17; |
| z >>= shiftCount; |
| } |
| return z; |
| invalid: |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| return UINT64_C( 0xFFFFFFFFFFFFFFFF ); |
| |
| } |
| |
| #endif |
| |