| // 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 |
| f128_to_ui64( float128_t a, uint_fast8_t roundingMode, bool exact ) |
| { |
| union ui128_f128 uA; |
| uint_fast64_t uiA64, uiA0; |
| bool sign; |
| int_fast32_t exp, shiftCount; |
| uint_fast64_t sig64, sig0; |
| struct uint128 sig128; |
| struct uint64_extra sigExtra; |
| |
| uA.f = a; |
| uiA64 = uA.ui.v64; |
| uiA0 = uA.ui.v0; |
| sign = signF128UI64( uiA64 ); |
| exp = expF128UI64( uiA64 ); |
| shiftCount = 0x402F - exp; |
| if ( shiftCount <= 0 ) { |
| if ( shiftCount < -15 ) { |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| return UINT64_C( 0xFFFFFFFFFFFFFFFF ); |
| } |
| sig64 = fracF128UI64( uiA64 ) | UINT64_C( 0x0001000000000000 ); |
| sig0 = uiA0; |
| if ( shiftCount ) { |
| sig128 = softfloat_shortShiftLeft128( sig64, sig0, -shiftCount ); |
| sig64 = sig128.v64; |
| sig0 = sig128.v0; |
| } |
| } else { |
| sig64 = fracF128UI64( uiA64 ); |
| sig0 = uiA0; |
| if ( exp ) sig64 |= UINT64_C( 0x0001000000000000 ); |
| sigExtra = softfloat_shiftRightJam64Extra( sig64, sig0, shiftCount ); |
| sig64 = sigExtra.v; |
| sig0 = sigExtra.extra; |
| } |
| return softfloat_roundPackToUI64( sign, sig64, sig0, roundingMode, exact ); |
| |
| } |
| |