| |
| /*============================================================================ |
| |
| 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 f128M_to_i64_r_minMag( const float128_t *aPtr, bool exact ) |
| { |
| |
| return f128_to_i64_r_minMag( *aPtr, exact ); |
| |
| } |
| |
| #else |
| |
| int_fast64_t f128M_to_i64_r_minMag( const float128_t *aPtr, bool exact ) |
| { |
| const uint32_t *aWPtr; |
| uint32_t uiA96; |
| bool sign; |
| int32_t exp, shiftCount; |
| uint32_t sig96, sig[4]; |
| uint64_t uiZ; |
| union { uint64_t ui; int64_t i; } uZ; |
| |
| aWPtr = (const uint32_t *) aPtr; |
| uiA96 = aWPtr[indexWordHi( 4 )]; |
| sign = signF128UI96( uiA96 ); |
| exp = expF128UI96( uiA96 ); |
| shiftCount = 0x403E - exp; |
| if ( shiftCount < 0 ) goto invalid; |
| if ( exact ) { |
| sig96 = fracF128UI96( uiA96 ); |
| if ( exp ) sig96 |= 0x00010000; |
| sig[indexWord( 4, 3 )] = sig96; |
| sig[indexWord( 4, 2 )] = aWPtr[indexWord( 4, 2 )]; |
| sig[indexWord( 4, 1 )] = aWPtr[indexWord( 4, 1 )]; |
| sig[indexWord( 4, 0 )] = aWPtr[indexWord( 4, 0 )]; |
| softfloat_shiftRightJam128M( sig, shiftCount + 17, sig ); |
| uiZ = (uint64_t) sig[indexWord( 4, 2 )]<<32 | sig[indexWord( 4, 1 )]; |
| if ( uiZ>>63 && (! sign || (uiZ != UINT64_C( 0x8000000000000000 ))) ) { |
| goto invalid; |
| } |
| if ( sig[indexWordLo( 4 )] ) { |
| softfloat_exceptionFlags |= softfloat_flag_inexact; |
| } |
| } else { |
| if ( 64 <= shiftCount ) return 0; |
| uiZ = |
| (uint64_t) fracF128UI96( uiA96 )<<47 |
| | (uint64_t) aWPtr[indexWord( 4, 2 )]<<15 |
| | aWPtr[indexWord( 4, 1 )]>>17; |
| if ( shiftCount ) { |
| uiZ |= UINT64_C( 0x8000000000000000 ); |
| uiZ >>= shiftCount; |
| } else { |
| if ( uiZ || ! sign ) goto invalid; |
| uiZ |= UINT64_C( 0x8000000000000000 ); |
| } |
| } |
| if ( sign ) uiZ = -uiZ; |
| uZ.ui = uiZ; |
| return uZ.i; |
| invalid: |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| return |
| sign && ! softfloat_isNaNF128M( aWPtr ) |
| ? -UINT64_C( 0x7FFFFFFFFFFFFFFF ) - 1 |
| : UINT64_C( 0x7FFFFFFFFFFFFFFF ); |
| |
| } |
| |
| #endif |
| |