| |
| /*============================================================================ |
| |
| 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_fast64_t f128_to_i64( float128_t a, uint_fast8_t roundingMode, bool exact ) |
| { |
| union ui128_f128 uA; |
| uint_fast64_t uiA64, uiA0; |
| bool sign; |
| int_fast32_t exp; |
| uint_fast64_t sig64, sig0; |
| int_fast32_t shiftCount; |
| struct uint128 sig128; |
| struct uint64_extra sigExtra; |
| |
| uA.f = a; |
| uiA64 = uA.ui.v64; |
| uiA0 = uA.ui.v0; |
| sign = signF128UI64( uiA64 ); |
| exp = expF128UI64( uiA64 ); |
| sig64 = fracF128UI64( uiA64 ); |
| sig0 = uiA0; |
| shiftCount = 0x402F - exp; |
| if ( shiftCount <= 0 ) { |
| if ( shiftCount < -15 ) { |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| return |
| ! sign || ((exp == 0x7FFF) && (sig64 | sig0)) |
| ? INT64_C( 0x7FFFFFFFFFFFFFFF ) |
| : -INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1; |
| } |
| sig64 |= UINT64_C( 0x0001000000000000 ); |
| if ( shiftCount ) { |
| sig128 = softfloat_shortShiftLeft128( sig64, sig0, -shiftCount ); |
| sig64 = sig128.v64; |
| sig0 = sig128.v0; |
| } |
| } else { |
| if ( exp ) sig64 |= UINT64_C( 0x0001000000000000 ); |
| sigExtra = softfloat_shiftRightJam64Extra( sig64, sig0, shiftCount ); |
| sig64 = sigExtra.v; |
| sig0 = sigExtra.extra; |
| } |
| return softfloat_roundPackToI64( sign, sig64, sig0, roundingMode, exact ); |
| |
| } |
| |