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Diffstat (limited to 'source/extF80M_to_f128M.c')
| -rw-r--r-- | source/extF80M_to_f128M.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/source/extF80M_to_f128M.c b/source/extF80M_to_f128M.c new file mode 100644 index 0000000..32c4b3b --- /dev/null +++ b/source/extF80M_to_f128M.c @@ -0,0 +1,122 @@ + +/*============================================================================ + +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 extF80M_to_f128M( const extFloat80_t *aPtr, float128_t *zPtr ) +{ + + *zPtr = extF80_to_f128( *aPtr ); + +} + +#else + +void extF80M_to_f128M( const extFloat80_t *aPtr, float128_t *zPtr ) +{ + const struct extFloat80M *aSPtr; + uint32_t *zWPtr; + uint_fast16_t uiA64; + bool sign; + int32_t exp; + uint64_t sig; + struct commonNaN commonNaN; + uint32_t uiZ96; + + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + aSPtr = (const struct extFloat80M *) aPtr; + zWPtr = (uint32_t *) zPtr; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + uiA64 = aSPtr->signExp; + sign = signExtF80UI64( uiA64 ); + exp = expExtF80UI64( uiA64 ); + sig = aSPtr->signif; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + zWPtr[indexWord( 4, 0 )] = 0; + if ( exp == 0x7FFF ) { + if ( sig & UINT64_C( 0x7FFFFFFFFFFFFFFF ) ) { + softfloat_extF80MToCommonNaN( aSPtr, &commonNaN ); + softfloat_commonNaNToF128M( &commonNaN, zWPtr ); + return; + } + uiZ96 = packToF128UI96( sign, 0x7FFF, 0 ); + goto uiZ; + } + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + if ( exp ) --exp; + if ( ! (sig & UINT64_C( 0x8000000000000000 )) ) { + if ( ! sig ) { + uiZ96 = packToF128UI96( sign, 0, 0 ); + goto uiZ; + } + exp += softfloat_normExtF80SigM( &sig ); + } + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + zWPtr[indexWord( 4, 1 )] = (uint32_t) sig<<17; + sig >>= 15; + zWPtr[indexWord( 4, 2 )] = sig; + if ( exp < 0 ) { + zWPtr[indexWordHi( 4 )] = sig>>32; + softfloat_shiftRight96M( + &zWPtr[indexMultiwordHi( 4, 3 )], + -exp, + &zWPtr[indexMultiwordHi( 4, 3 )] + ); + exp = 0; + sig = (uint64_t) zWPtr[indexWordHi( 4 )]<<32; + } + zWPtr[indexWordHi( 4 )] = packToF128UI96( sign, exp, sig>>32 ); + return; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + uiZ: + zWPtr[indexWord( 4, 3 )] = uiZ96; + zWPtr[indexWord( 4, 2 )] = 0; + zWPtr[indexWord( 4, 1 )] = 0; + +} + +#endif + |