| |
| /*============================================================================ |
| |
| 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 "internals.h" |
| #include "platform.h" |
| #include "softfloat.h" |
| #include "specialize.h" |
| |
| int_fast64_t f32_to_i64( float32_t a, uint_fast8_t roundingMode, bool exact ) |
| { |
| union ui32_f32 uA; |
| uint_fast32_t uiA; |
| bool sign; |
| int_fast16_t exp; |
| uint_fast32_t sig; |
| int_fast16_t shiftDist; |
| #ifdef SOFTFLOAT_FAST_INT64 |
| uint_fast64_t sig64, extra; |
| struct uint64_extra sig64Extra; |
| #else |
| uint32_t extSig[3]; |
| #endif |
| |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| uA.f = a; |
| uiA = uA.ui; |
| sign = signF32UI( uiA ); |
| exp = expF32UI( uiA ); |
| sig = fracF32UI( uiA ); |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| shiftDist = 0xBE - exp; |
| if ( shiftDist < 0 ) { |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| return |
| (exp == 0xFF) && sig ? i64_fromNaN |
| : sign ? i64_fromNegOverflow : i64_fromPosOverflow; |
| } |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| if ( exp ) sig |= 0x00800000; |
| #ifdef SOFTFLOAT_FAST_INT64 |
| sig64 = (uint_fast64_t) sig<<40; |
| extra = 0; |
| if ( shiftDist ) { |
| sig64Extra = softfloat_shiftRightJam64Extra( sig64, 0, shiftDist ); |
| sig64 = sig64Extra.v; |
| extra = sig64Extra.extra; |
| } |
| return softfloat_roundToI64( sign, sig64, extra, roundingMode, exact ); |
| #else |
| extSig[indexWord( 3, 2 )] = sig<<8; |
| extSig[indexWord( 3, 1 )] = 0; |
| extSig[indexWord( 3, 0 )] = 0; |
| if ( shiftDist ) softfloat_shiftRightJam96M( extSig, shiftDist, extSig ); |
| return softfloat_roundMToI64( sign, extSig, roundingMode, exact ); |
| #endif |
| |
| } |
| |