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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/s_roundPackToF64.c | |
parent | 8e69141749065ff957383d2112768f95a33429b6 (diff) | |
download | riscv-pk-5cd8d2b93fad2011fdf8f49a263d77697af35b32.zip riscv-pk-5cd8d2b93fad2011fdf8f49a263d77697af35b32.tar.gz riscv-pk-5cd8d2b93fad2011fdf8f49a263d77697af35b32.tar.bz2 |
Upgrade to SoftFloat 3e
Diffstat (limited to 'softfloat/s_roundPackToF64.c')
-rw-r--r--[-rwxr-xr-x] | softfloat/s_roundPackToF64.c | 101 |
1 files changed, 75 insertions, 26 deletions
diff --git a/softfloat/s_roundPackToF64.c b/softfloat/s_roundPackToF64.c index a5fd9eb..4525097 100755..100644 --- a/softfloat/s_roundPackToF64.c +++ b/softfloat/s_roundPackToF64.c @@ -1,65 +1,114 @@ -// See LICENSE.SoftFloat for license details. +/*============================================================================ + +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, 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 "primitives.h" #include "internals.h" #include "softfloat.h" float64_t softfloat_roundPackToF64( bool sign, int_fast16_t exp, uint_fast64_t sig ) { - int roundingMode; - bool roundNearestEven; - int roundIncrement, roundBits; + uint_fast8_t roundingMode; + bool roundNearEven; + uint_fast16_t roundIncrement, roundBits; bool isTiny; uint_fast64_t uiZ; union ui64_f64 uZ; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ roundingMode = softfloat_roundingMode; - roundNearestEven = ( roundingMode == softfloat_round_nearest_even ); + roundNearEven = (roundingMode == softfloat_round_near_even); roundIncrement = 0x200; - if ( - ! roundNearestEven - && ( roundingMode != softfloat_round_nearest_maxMag ) - ) { + if ( ! roundNearEven && (roundingMode != softfloat_round_near_maxMag) ) { roundIncrement = - ( roundingMode == softfloat_round_minMag ) - || ( roundingMode - == ( sign ? softfloat_round_max : softfloat_round_min ) ) - ? 0 - : 0x3FF; + (roundingMode + == (sign ? softfloat_round_min : softfloat_round_max)) + ? 0x3FF + : 0; } roundBits = sig & 0x3FF; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ if ( 0x7FD <= (uint16_t) exp ) { if ( exp < 0 ) { + /*---------------------------------------------------------------- + *----------------------------------------------------------------*/ isTiny = - ( softfloat_detectTininess - == softfloat_tininess_beforeRounding ) - || ( exp < -1 ) - || ( sig + roundIncrement < UINT64_C( 0x8000000000000000 ) ); - sig = softfloat_shift64RightJam( sig, - exp ); + (softfloat_detectTininess == softfloat_tininess_beforeRounding) + || (exp < -1) + || (sig + roundIncrement < UINT64_C( 0x8000000000000000 )); + sig = softfloat_shiftRightJam64( sig, -exp ); exp = 0; roundBits = sig & 0x3FF; if ( isTiny && roundBits ) { softfloat_raiseFlags( softfloat_flag_underflow ); } } else if ( - ( 0x7FD < exp ) - || ( UINT64_C( 0x8000000000000000 ) <= sig + roundIncrement ) + (0x7FD < exp) + || (UINT64_C( 0x8000000000000000 ) <= sig + roundIncrement) ) { + /*---------------------------------------------------------------- + *----------------------------------------------------------------*/ softfloat_raiseFlags( softfloat_flag_overflow | softfloat_flag_inexact ); uiZ = packToF64UI( sign, 0x7FF, 0 ) - ! roundIncrement; goto uiZ; } } - if ( roundBits ) softfloat_raiseFlags( softfloat_flag_inexact ); - sig = ( sig + roundIncrement )>>10; - sig &= ~ ( ! ( roundBits ^ 0x200 ) & roundNearestEven ); - uiZ = packToF64UI( sign, sig ? exp : 0, sig ); + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + sig = (sig + roundIncrement)>>10; + if ( roundBits ) { + softfloat_raiseFlags( softfloat_flag_inexact ); +#ifdef SOFTFLOAT_ROUND_ODD + if ( roundingMode == softfloat_round_odd ) { + sig |= 1; + goto packReturn; + } +#endif + } + sig &= ~(uint_fast64_t) (! (roundBits ^ 0x200) & roundNearEven); + if ( ! sig ) exp = 0; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + packReturn: + uiZ = packToF64UI( sign, exp, sig ); uiZ: uZ.ui = uiZ; return uZ.f; |