diff options
Diffstat (limited to 'softfloat/f64_to_ui64.c')
-rw-r--r--[-rwxr-xr-x] | softfloat/f64_to_ui64.c | 146 |
1 files changed, 103 insertions, 43 deletions
diff --git a/softfloat/f64_to_ui64.c b/softfloat/f64_to_ui64.c index 969fa07..e7fb8f6 100755..100644 --- a/softfloat/f64_to_ui64.c +++ b/softfloat/f64_to_ui64.c @@ -1,43 +1,103 @@ -// See LICENSE.SoftFloat for license details. - -
-#include <stdbool.h>
-#include <stdint.h>
-#include "platform.h"
-#include "primitives.h"
-#include "internals.h"
-#include "softfloat.h"
-
-uint_fast64_t f64_to_ui64( float64_t a, int_fast8_t roundingMode, bool exact )
-{
- union ui64_f64 uA;
- uint_fast64_t uiA;
- bool sign;
- int_fast16_t exp;
- uint_fast64_t sig;
- int_fast16_t shiftCount;
- struct uint64_extra sigExtra;
-
- uA.f = a;
- uiA = uA.ui;
- sign = signF64UI( uiA );
- exp = expF64UI( uiA );
- sig = fracF64UI( uiA );
- if ( exp ) sig |= UINT64_C( 0x0010000000000000 );
- shiftCount = 0x433 - exp;
- if ( shiftCount <= 0 ) {
- if ( 0x43E < exp ) {
- softfloat_raiseFlags( softfloat_flag_invalid );
- return UINT64_C( 0xFFFFFFFFFFFFFFFF );
- }
- sigExtra.v = sig<<( - shiftCount );
- sigExtra.extra = 0;
- } else {
- sigExtra = softfloat_shift64ExtraRightJam( sig, 0, shiftCount );
- }
- return
- softfloat_roundPackToUI64(
- sign, sigExtra.v, sigExtra.extra, roundingMode, exact );
-
-}
-
+ +/*============================================================================ + +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_fast64_t f64_to_ui64( float64_t a, uint_fast8_t roundingMode, bool exact ) +{ + union ui64_f64 uA; + uint_fast64_t uiA; + bool sign; + int_fast16_t exp; + uint_fast64_t sig; + int_fast16_t shiftDist; +#ifdef SOFTFLOAT_FAST_INT64 + struct uint64_extra sigExtra; +#else + uint32_t extSig[3]; +#endif + + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + uA.f = a; + uiA = uA.ui; + sign = signF64UI( uiA ); + exp = expF64UI( uiA ); + sig = fracF64UI( uiA ); + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + if ( exp ) sig |= UINT64_C( 0x0010000000000000 ); + shiftDist = 0x433 - exp; +#ifdef SOFTFLOAT_FAST_INT64 + if ( shiftDist <= 0 ) { + if ( shiftDist < -11 ) goto invalid; + sigExtra.v = sig<<-shiftDist; + sigExtra.extra = 0; + } else { + sigExtra = softfloat_shiftRightJam64Extra( sig, 0, shiftDist ); + } + return + softfloat_roundToUI64( + sign, sigExtra.v, sigExtra.extra, roundingMode, exact ); +#else + extSig[indexWord( 3, 0 )] = 0; + if ( shiftDist <= 0 ) { + if ( shiftDist < -11 ) goto invalid; + sig <<= -shiftDist; + extSig[indexWord( 3, 2 )] = sig>>32; + extSig[indexWord( 3, 1 )] = sig; + } else { + extSig[indexWord( 3, 2 )] = sig>>32; + extSig[indexWord( 3, 1 )] = sig; + softfloat_shiftRightJam96M( extSig, shiftDist, extSig ); + } + return softfloat_roundMToUI64( sign, extSig, roundingMode, exact ); +#endif + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + invalid: + softfloat_raiseFlags( softfloat_flag_invalid ); + return + (exp == 0x7FF) && fracF64UI( uiA ) ? ui64_fromNaN + : sign ? ui64_fromNegOverflow : ui64_fromPosOverflow; + +} + |