diff options
author | Andrew Waterman <waterman@cs.berkeley.edu> | 2016-03-01 16:24:05 -0800 |
---|---|---|
committer | Andrew Waterman <waterman@cs.berkeley.edu> | 2016-03-01 16:24:44 -0800 |
commit | a95b44df9d142a49f3e1bfe4a60d259ed41ca247 (patch) | |
tree | 49f59c903609e5b0de05d5b0c7f7bd23de8c4f13 /softfloat/s_roundPackToI32.c | |
parent | bea283531abfd013811e83c75ff6189a0d9b3075 (diff) | |
download | spike-a95b44df9d142a49f3e1bfe4a60d259ed41ca247.zip spike-a95b44df9d142a49f3e1bfe4a60d259ed41ca247.tar.gz spike-a95b44df9d142a49f3e1bfe4a60d259ed41ca247.tar.bz2 |
Upgrade to latest SoftFloat
Diffstat (limited to 'softfloat/s_roundPackToI32.c')
-rw-r--r--[-rwxr-xr-x] | softfloat/s_roundPackToI32.c | 70 |
1 files changed, 53 insertions, 17 deletions
diff --git a/softfloat/s_roundPackToI32.c b/softfloat/s_roundPackToI32.c index 1c91497..3ece8f0 100755..100644 --- a/softfloat/s_roundPackToI32.c +++ b/softfloat/s_roundPackToI32.c @@ -1,48 +1,84 @@ +/*============================================================================ + +This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic +Package, Release 3a+, by John R. Hauser. + +Copyright 2011, 2012, 2013, 2014, 2015, 2016 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" int_fast32_t softfloat_roundPackToI32( - bool sign, uint_fast64_t sig, int_fast8_t roundingMode, bool exact ) + bool sign, uint_fast64_t sig, uint_fast8_t roundingMode, bool exact ) { - bool roundNearestEven; - int roundIncrement, roundBits; + bool roundNearEven; + uint_fast8_t roundIncrement, roundBits; uint_fast32_t sig32; union { uint32_t ui; int32_t i; } uZ; int_fast32_t z; - roundNearestEven = ( roundingMode == softfloat_round_nearest_even ); + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + roundNearEven = (roundingMode == softfloat_round_near_even); roundIncrement = 0x40; - 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 - : 0x7F; + (roundingMode + == (sign ? softfloat_round_min : softfloat_round_max)) + ? 0x7F + : 0; } roundBits = sig & 0x7F; sig += roundIncrement; if ( sig & UINT64_C( 0xFFFFFF8000000000 ) ) goto invalid; sig32 = sig>>7; - sig32 &= ~ ( ! ( roundBits ^ 0x40 ) & roundNearestEven ); - uZ.ui = sign ? - sig32 : sig32; + sig32 &= ~(uint_fast32_t) (! (roundBits ^ 0x40) & roundNearEven); + uZ.ui = sign ? -sig32 : sig32; z = uZ.i; - if ( z && ( ( z < 0 ) ^ sign ) ) goto invalid; + if ( z && ((z < 0) ^ sign) ) goto invalid; if ( exact && roundBits ) { softfloat_exceptionFlags |= softfloat_flag_inexact; } return z; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ invalid: softfloat_raiseFlags( softfloat_flag_invalid ); - return sign ? -0x7FFFFFFF - 1 : 0x7FFFFFFF; + return sign ? i32_fromNegOverflow : i32_fromPosOverflow; } |