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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:49:04 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:49:04 +0000 |
commit | 16f504a9dca3fe3b70568f67b7d41241ae485288 (patch) | |
tree | c60f36ada0496ba928b7161059ba5ab1ab224f9d /src/libs/softfloat-3e/source/f64_to_ui64.c | |
parent | Initial commit. (diff) | |
download | virtualbox-upstream.tar.xz virtualbox-upstream.zip |
Adding upstream version 7.0.6-dfsg.upstream/7.0.6-dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/libs/softfloat-3e/source/f64_to_ui64.c')
-rw-r--r-- | src/libs/softfloat-3e/source/f64_to_ui64.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/src/libs/softfloat-3e/source/f64_to_ui64.c b/src/libs/softfloat-3e/source/f64_to_ui64.c new file mode 100644 index 00000000..5670c9b3 --- /dev/null +++ b/src/libs/softfloat-3e/source/f64_to_ui64.c @@ -0,0 +1,103 @@ + +/*============================================================================ + +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 SOFTFLOAT_STATE_DECL_COMMA ) +{ + 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 SOFTFLOAT_STATE_ARG_COMMA ); +#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 SOFTFLOAT_STATE_ARG_COMMA); +#endif + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + invalid: + softfloat_raiseFlags( softfloat_flag_invalid SOFTFLOAT_STATE_ARG_COMMA ); + return + (exp == 0x7FF) && fracF64UI( uiA ) ? ui64_fromNaN + : sign ? ui64_fromNegOverflow : ui64_fromPosOverflow; + +} + |