+/*============================================================================
+
+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"
uint_fast64_t
softfloat_roundPackToUI64(
bool sign,
- uint_fast64_t sig64,
- uint_fast64_t sig0,
- int_fast8_t roundingMode,
+ uint_fast64_t sig,
+ uint_fast64_t sigExtra,
+ uint_fast8_t roundingMode,
bool exact
)
{
- bool roundNearestEven, increment;
-
- roundNearestEven = ( roundingMode == softfloat_round_nearest_even );
- increment = ( UINT64_C( 0x8000000000000000 ) <= sig0 );
- if (
- ! roundNearestEven
- && ( roundingMode != softfloat_round_nearest_maxMag )
- ) {
- increment =
- ( roundingMode != softfloat_round_minMag )
- && ( roundingMode
- == ( sign ? softfloat_round_min : softfloat_round_max ) )
- && sig0;
+ bool roundNearEven, doIncrement;
+
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ roundNearEven = (roundingMode == softfloat_round_near_even);
+ doIncrement = (UINT64_C( 0x8000000000000000 ) <= sigExtra);
+ if ( ! roundNearEven && (roundingMode != softfloat_round_near_maxMag) ) {
+ doIncrement =
+ (roundingMode
+ == (sign ? softfloat_round_min : softfloat_round_max))
+ && sigExtra;
+ }
+ if ( doIncrement ) {
+ ++sig;
+ if ( ! sig ) goto invalid;
+ sig &=
+ ~(uint_fast64_t)
+ (! (sigExtra & UINT64_C( 0x7FFFFFFFFFFFFFFF ))
+ & roundNearEven);
}
- if ( increment ) {
- ++sig64;
- if ( ! sig64 ) goto invalid;
- sig64 &=
- ~ ( ! ( sig0 & UINT64_C( 0x7FFFFFFFFFFFFFFF ) )
- & roundNearestEven );
+ if ( sign && sig ) goto invalid;
+ if ( exact && sigExtra ) {
+ softfloat_exceptionFlags |= softfloat_flag_inexact;
}
- if ( sign && sig64 ) goto invalid;
- if ( exact && sig0 ) softfloat_exceptionFlags |= softfloat_flag_inexact;
- return sig64;
+ return sig;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
invalid:
softfloat_raiseFlags( softfloat_flag_invalid );
- return UINT64_C( 0xFFFFFFFFFFFFFFFF );
+ return sign ? ui64_fromNegOverflow : ui64_fromPosOverflow;
}