| |
| /*============================================================================ |
| |
| This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic |
| Package, Release 3d, by John R. Hauser. |
| |
| Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 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 "specialize.h" |
| #include "softfloat.h" |
| |
| int_fast64_t f16_to_i64( float16_t a, uint_fast8_t roundingMode, bool exact ) |
| { |
| union ui16_f16 uA; |
| uint_fast16_t uiA; |
| bool sign; |
| int_fast8_t exp; |
| uint_fast16_t frac; |
| int_fast32_t sig32; |
| int_fast8_t shiftDist; |
| |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| uA.f = a; |
| uiA = uA.ui; |
| sign = signF16UI( uiA ); |
| exp = expF16UI( uiA ); |
| frac = fracF16UI( uiA ); |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| if ( exp == 0x1F ) { |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| return |
| frac ? i64_fromNaN |
| : sign ? i64_fromNegOverflow : i64_fromPosOverflow; |
| } |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| sig32 = frac; |
| if ( exp ) { |
| sig32 |= 0x0400; |
| shiftDist = exp - 0x19; |
| if ( 0 <= shiftDist ) { |
| sig32 <<= shiftDist; |
| return sign ? -sig32 : sig32; |
| } |
| shiftDist = exp - 0x0D; |
| if ( 0 < shiftDist ) sig32 <<= shiftDist; |
| } |
| return |
| softfloat_roundToI32( |
| sign, (uint_fast32_t) sig32, roundingMode, exact ); |
| |
| } |
| |