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author | Andrew Waterman <andrew@sifive.com> | 2018-07-11 01:16:28 -0700 |
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committer | Andrew Waterman <andrew@sifive.com> | 2018-07-11 01:16:28 -0700 |
commit | 5cd8d2b93fad2011fdf8f49a263d77697af35b32 (patch) | |
tree | f6fb9cb6d3bef2aa5c9903511b92e5a6e99e9519 /softfloat/f128M_to_extF80M.c | |
parent | 8e69141749065ff957383d2112768f95a33429b6 (diff) | |
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Upgrade to SoftFloat 3e
Diffstat (limited to 'softfloat/f128M_to_extF80M.c')
-rw-r--r-- | softfloat/f128M_to_extF80M.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/softfloat/f128M_to_extF80M.c b/softfloat/f128M_to_extF80M.c new file mode 100644 index 0000000..fe8b0fc --- /dev/null +++ b/softfloat/f128M_to_extF80M.c @@ -0,0 +1,101 @@ + +/*============================================================================ + +This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic +Package, Release 3e, 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 "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 + |