| |
| /*============================================================================ |
| |
| 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" |
| |
| int_fast32_t f128_to_i32_r_minMag( float128_t a, bool exact ) |
| { |
| union ui128_f128 uA; |
| uint_fast64_t uiA64, uiA0; |
| int_fast32_t exp; |
| uint_fast64_t sig64; |
| int_fast32_t shiftCount; |
| bool sign; |
| int_fast32_t absZ; |
| |
| uA.f = a; |
| uiA64 = uA.ui.v64; |
| uiA0 = uA.ui.v0; |
| exp = expF128UI64( uiA64 ); |
| sig64 = fracF128UI64( uiA64 ) | (uiA0 != 0); |
| shiftCount = 0x402F - exp; |
| if ( 49 <= shiftCount ) { |
| if ( exact && (exp | sig64) ) { |
| softfloat_exceptionFlags |= softfloat_flag_inexact; |
| } |
| return 0; |
| } |
| sign = signF128UI64( uiA64 ); |
| if ( shiftCount < 18 ) { |
| if ( |
| sign && (shiftCount == 17) |
| && (sig64 < UINT64_C( 0x0000000000020000 )) |
| ) { |
| if ( exact && sig64 ) { |
| softfloat_exceptionFlags |= softfloat_flag_inexact; |
| } |
| } else { |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| if ( ! sign || ((exp == 0x7FFF) && sig64) ) return 0x7FFFFFFF; |
| } |
| return -0x7FFFFFFF - 1; |
| } |
| sig64 |= UINT64_C( 0x0001000000000000 ); |
| absZ = sig64>>shiftCount; |
| if ( |
| exact && ((uint_fast64_t) (uint_fast32_t) absZ<<shiftCount != sig64) |
| ) { |
| softfloat_exceptionFlags |= softfloat_flag_inexact; |
| } |
| return sign ? -absZ : absZ; |
| |
| } |
| |