| |
| /*============================================================================ |
| |
| 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 f64_to_i64( float64_t a, uint_fast8_t roundingMode, bool exact ) |
| { |
| union ui64_f64 uA; |
| uint_fast64_t uiA; |
| bool sign; |
| int_fast16_t exp; |
| uint_fast64_t sig; |
| int_fast16_t shiftCount; |
| #ifdef SOFTFLOAT_FAST_INT64 |
| struct uint64_extra sigExtra; |
| #else |
| uint32_t extSig[3]; |
| #endif |
| |
| uA.f = a; |
| uiA = uA.ui; |
| sign = signF64UI( uiA ); |
| exp = expF64UI( uiA ); |
| sig = fracF64UI( uiA ); |
| if ( exp ) sig |= UINT64_C( 0x0010000000000000 ); |
| shiftCount = 0x433 - exp; |
| #ifdef SOFTFLOAT_FAST_INT64 |
| if ( shiftCount <= 0 ) { |
| if ( shiftCount < -11 ) { |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| return |
| ! sign |
| || ((exp == 0x7FF) |
| && (sig != UINT64_C( 0x0010000000000000 ))) |
| ? INT64_C( 0x7FFFFFFFFFFFFFFF ) |
| : -INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1; |
| } |
| sigExtra.v = sig<<-shiftCount; |
| sigExtra.extra = 0; |
| } else { |
| sigExtra = softfloat_shiftRightJam64Extra( sig, 0, shiftCount ); |
| } |
| return |
| softfloat_roundPackToI64( |
| sign, sigExtra.v, sigExtra.extra, roundingMode, exact ); |
| #else |
| extSig[indexWord( 3, 0 )] = 0; |
| if ( shiftCount <= 0 ) { |
| if ( shiftCount < -11 ) { |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| return |
| ! sign |
| || ((exp == 0x7FF) |
| && (sig != UINT64_C( 0x0010000000000000 ))) |
| ? INT64_C( 0x7FFFFFFFFFFFFFFF ) |
| : -INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1; |
| } |
| sig <<= -shiftCount; |
| extSig[indexWord( 3, 2 )] = sig>>32; |
| extSig[indexWord( 3, 1 )] = sig; |
| } else { |
| extSig[indexWord( 3, 2 )] = sig>>32; |
| extSig[indexWord( 3, 1 )] = sig; |
| softfloat_shiftRightJam96M( extSig, shiftCount, extSig ); |
| } |
| return softfloat_roundPackMToI64( sign, extSig, roundingMode, exact ); |
| #endif |
| |
| } |
| |