| |
| /*============================================================================ |
| |
| This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic |
| Package, Release 3, by John R. Hauser. |
| |
| Copyright 2011, 2012, 2013, 2014 The Regents of the University of California |
| (Regents). All Rights Reserved. Redistribution and use in source and binary |
| forms, with or without modification, are permitted provided that the following |
| conditions are met: |
| |
| Redistributions of source code must retain the above copyright notice, |
| this list of conditions, and the following two paragraphs of disclaimer. |
| Redistributions in binary form must reproduce the above copyright notice, |
| this list of conditions, and the following two paragraphs of disclaimer in the |
| documentation and/or other materials provided with the distribution. Neither |
| the name of the Regents nor the names of its contributors may be used to |
| endorse or promote products derived from this software without specific prior |
| written permission. |
| |
| IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, |
| SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING |
| OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS |
| BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED |
| TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED |
| HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE |
| MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| |
| =============================================================================*/ |
| |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include "platform.h" |
| #include "internals.h" |
| #include "specialize.h" |
| #include "softfloat.h" |
| |
| #ifdef SOFTFLOAT_FAST_INT64 |
| |
| void f128M_to_extF80M( const float128_t *aPtr, extFloat80_t *zPtr ) |
| { |
| |
| *zPtr = f128_to_extF80( *aPtr ); |
| |
| } |
| |
| #else |
| |
| void f128M_to_extF80M( const float128_t *aPtr, extFloat80_t *zPtr ) |
| { |
| const uint32_t *aWPtr; |
| struct extFloat80M *zSPtr; |
| uint32_t uiA96; |
| bool sign; |
| int32_t exp; |
| struct commonNaN commonNaN; |
| uint32_t sig[4]; |
| |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| aWPtr = (const uint32_t *) aPtr; |
| zSPtr = (struct extFloat80M *) zPtr; |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| uiA96 = aWPtr[indexWordHi( 4 )]; |
| sign = signF128UI96( uiA96 ); |
| exp = expF128UI96( uiA96 ); |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| if ( exp == 0x7FFF ) { |
| if ( softfloat_isNaNF128M( aWPtr ) ) { |
| softfloat_f128MToCommonNaN( aWPtr, &commonNaN ); |
| softfloat_commonNaNToExtF80M( &commonNaN, zSPtr ); |
| return; |
| } |
| zSPtr->signExp = packToExtF80UI64( sign, 0x7FFF ); |
| zSPtr->signif = UINT64_C( 0x8000000000000000 ); |
| return; |
| } |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| exp = softfloat_shiftNormSigF128M( aWPtr, 15, sig ); |
| if ( exp == -128 ) { |
| zSPtr->signExp = packToExtF80UI64( sign, 0 ); |
| zSPtr->signif = 0; |
| return; |
| } |
| if ( sig[indexWord( 4, 0 )] ) sig[indexWord( 4, 1 )] |= 1; |
| softfloat_roundPackMToExtF80M( |
| sign, exp, &sig[indexMultiwordHi( 4, 3 )], 80, zSPtr ); |
| |
| } |
| |
| #endif |
| |