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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/f128_to_ui32.c | |
parent | 8e69141749065ff957383d2112768f95a33429b6 (diff) | |
download | pk-5cd8d2b93fad2011fdf8f49a263d77697af35b32.zip pk-5cd8d2b93fad2011fdf8f49a263d77697af35b32.tar.gz pk-5cd8d2b93fad2011fdf8f49a263d77697af35b32.tar.bz2 |
Upgrade to SoftFloat 3e
Diffstat (limited to 'softfloat/f128_to_ui32.c')
-rw-r--r-- | softfloat/f128_to_ui32.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/softfloat/f128_to_ui32.c b/softfloat/f128_to_ui32.c new file mode 100644 index 0000000..54b07d6 --- /dev/null +++ b/softfloat/f128_to_ui32.c @@ -0,0 +1,86 @@ + +/*============================================================================ + +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, 2015, 2016, 2017 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" + +uint_fast32_t + f128_to_ui32( float128_t a, uint_fast8_t roundingMode, bool exact ) +{ + union ui128_f128 uA; + uint_fast64_t uiA64, uiA0; + bool sign; + int_fast32_t exp; + uint_fast64_t sig64; + int_fast32_t shiftDist; + + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + uA.f = a; + uiA64 = uA.ui.v64; + uiA0 = uA.ui.v0; + sign = signF128UI64( uiA64 ); + exp = expF128UI64( uiA64 ); + sig64 = fracF128UI64( uiA64 ) | (uiA0 != 0); + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ +#if (ui32_fromNaN != ui32_fromPosOverflow) || (ui32_fromNaN != ui32_fromNegOverflow) + if ( (exp == 0x7FFF) && sig64 ) { +#if (ui32_fromNaN == ui32_fromPosOverflow) + sign = 0; +#elif (ui32_fromNaN == ui32_fromNegOverflow) + sign = 1; +#else + softfloat_raiseFlags( softfloat_flag_invalid ); + return ui32_fromNaN; +#endif + } +#endif + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + if ( exp ) sig64 |= UINT64_C( 0x0001000000000000 ); + shiftDist = 0x4023 - exp; + if ( 0 < shiftDist ) { + sig64 = softfloat_shiftRightJam64( sig64, shiftDist ); + } + return softfloat_roundToUI32( sign, sig64, roundingMode, exact ); + +} + |