| // SPDX-License-Identifier: BSD-3-Clause |
| |
| /*============================================================================ |
| |
| This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic |
| Package, Release 3a, by John R. Hauser. |
| |
| Copyright 2011, 2012, 2013, 2014 The Regents of the University of California. |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are met: |
| |
| 1. Redistributions of source code must retain the above copyright notice, |
| this list of conditions, and the following disclaimer. |
| |
| 2. Redistributions in binary form must reproduce the above copyright notice, |
| this list of conditions, and the following disclaimer in the documentation |
| and/or other materials provided with the distribution. |
| |
| 3. Neither the name of the University nor the names of its contributors may |
| be used to endorse or promote products derived from this software without |
| specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY |
| EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE |
| DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY |
| DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| =============================================================================*/ |
| |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include "platform.h" |
| #include "internals.h" |
| #include "softfloat.h" |
| |
| uint_fast64_t f64_to_ui64( 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 UINT64_C( 0xFFFFFFFFFFFFFFFF ); |
| } |
| sigExtra.v = sig<<-shiftCount; |
| sigExtra.extra = 0; |
| } else { |
| sigExtra = softfloat_shiftRightJam64Extra( sig, 0, shiftCount ); |
| } |
| return |
| softfloat_roundPackToUI64( |
| 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 UINT64_C( 0xFFFFFFFFFFFFFFFF ); |
| } |
| 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_roundPackMToUI64( sign, extSig, roundingMode, exact ); |
| #endif |
| |
| } |
| |