| |
| /*============================================================================ |
| |
| 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" |
| |
| #ifdef SOFTFLOAT_FAST_INT64 |
| |
| int_fast64_t extF80M_to_i64_r_minMag( const extFloat80_t *aPtr, bool exact ) |
| { |
| |
| return extF80_to_i64_r_minMag( *aPtr, exact ); |
| |
| } |
| |
| #else |
| |
| int_fast64_t extF80M_to_i64_r_minMag( const extFloat80_t *aPtr, bool exact ) |
| { |
| const struct extFloat80M *aSPtr; |
| uint_fast16_t uiA64; |
| int32_t exp; |
| uint64_t sig; |
| int32_t shiftCount; |
| bool raiseInexact; |
| int64_t z; |
| uint64_t absZ; |
| union { uint64_t ui; int64_t i; } u; |
| |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| aSPtr = (const struct extFloat80M *) aPtr; |
| uiA64 = aSPtr->signExp; |
| exp = expExtF80UI64( uiA64 ); |
| sig = aSPtr->signif; |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| if ( ! sig && (exp != 0x7FFF) ) return 0; |
| shiftCount = 0x403E - exp; |
| if ( 64 <= shiftCount ) { |
| raiseInexact = exact; |
| z = 0; |
| } else { |
| raiseInexact = false; |
| if ( shiftCount < 0 ) { |
| if ( shiftCount <= -63 ) goto invalid; |
| shiftCount = -shiftCount; |
| absZ = sig<<shiftCount; |
| if ( absZ>>shiftCount != sig ) goto invalid; |
| } else { |
| absZ = sig; |
| if ( shiftCount ) absZ >>= shiftCount; |
| if ( exact && shiftCount ) { |
| raiseInexact = (absZ<<shiftCount != sig); |
| } |
| } |
| if ( signExtF80UI64( uiA64 ) ) { |
| if ( UINT64_C( 0x8000000000000000 ) < absZ ) goto invalid; |
| u.ui = -absZ; |
| z = u.i; |
| } else { |
| if ( UINT64_C( 0x8000000000000000 ) <= absZ ) goto invalid; |
| z = absZ; |
| } |
| } |
| if ( raiseInexact ) softfloat_exceptionFlags |= softfloat_flag_inexact; |
| return z; |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| invalid: |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| return |
| ! signExtF80UI64( uiA64 ) |
| || ((exp == 0x7FFF) && (sig & UINT64_C( 0x7FFFFFFFFFFFFFFF ))) |
| ? UINT64_C( 0x7FFFFFFFFFFFFFFF ) |
| : -UINT64_C( 0x7FFFFFFFFFFFFFFF ) - 1; |
| |
| } |
| |
| #endif |
| |