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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:49:04 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:49:04 +0000
commit16f504a9dca3fe3b70568f67b7d41241ae485288 (patch)
treec60f36ada0496ba928b7161059ba5ab1ab224f9d /src/libs/softfloat-3e/source/f128_roundToInt.c
parentInitial commit. (diff)
downloadvirtualbox-16f504a9dca3fe3b70568f67b7d41241ae485288.tar.xz
virtualbox-16f504a9dca3fe3b70568f67b7d41241ae485288.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/f128_roundToInt.c')
-rw-r--r--src/libs/softfloat-3e/source/f128_roundToInt.c174
1 files changed, 174 insertions, 0 deletions
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+
+/*============================================================================
+
+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, 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"
+#include <iprt/cdefs.h> /* VBox: for RT_FALL_THROUGH */
+
+float128_t
+ f128_roundToInt( float128_t a, uint_fast8_t roundingMode, bool exact SOFTFLOAT_STATE_DECL_COMMA )
+{
+ union ui128_f128 uA;
+ uint_fast64_t uiA64, uiA0;
+ int_fast32_t exp;
+ struct uint128 uiZ;
+ uint_fast64_t lastBitMask0, roundBitsMask;
+ bool roundNearEven;
+ uint_fast64_t lastBitMask64;
+ union ui128_f128 uZ;
+
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ uA.f = a;
+ uiA64 = uA.ui.v64;
+ uiA0 = uA.ui.v0;
+ exp = expF128UI64( uiA64 );
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ if ( 0x402F <= exp ) {
+ /*--------------------------------------------------------------------
+ *--------------------------------------------------------------------*/
+ if ( 0x406F <= exp ) {
+ if ( (exp == 0x7FFF) && (fracF128UI64( uiA64 ) | uiA0) ) {
+ uiZ = softfloat_propagateNaNF128UI( uiA64, uiA0, 0, 0 SOFTFLOAT_STATE_ARG_COMMA );
+ goto uiZ;
+ }
+ return a;
+ }
+ /*--------------------------------------------------------------------
+ *--------------------------------------------------------------------*/
+ lastBitMask0 = (uint_fast64_t) 2<<(0x406E - exp);
+ roundBitsMask = lastBitMask0 - 1;
+ uiZ.v64 = uiA64;
+ uiZ.v0 = uiA0;
+ roundNearEven = (roundingMode == softfloat_round_near_even);
+ if ( roundNearEven || (roundingMode == softfloat_round_near_maxMag) ) {
+ if ( exp == 0x402F ) {
+ if ( UINT64_C( 0x8000000000000000 ) <= uiZ.v0 ) {
+ ++uiZ.v64;
+ if (
+ roundNearEven
+ && (uiZ.v0 == UINT64_C( 0x8000000000000000 ))
+ ) {
+ uiZ.v64 &= ~1;
+ }
+ }
+ } else {
+ uiZ = softfloat_add128( uiZ.v64, uiZ.v0, 0, lastBitMask0>>1 );
+ if ( roundNearEven && !(uiZ.v0 & roundBitsMask) ) {
+ uiZ.v0 &= ~lastBitMask0;
+ }
+ }
+ } else if (
+ roundingMode
+ == (signF128UI64( uiZ.v64 ) ? softfloat_round_min
+ : softfloat_round_max)
+ ) {
+ uiZ = softfloat_add128( uiZ.v64, uiZ.v0, 0, roundBitsMask );
+ }
+ uiZ.v0 &= ~roundBitsMask;
+ lastBitMask64 = !lastBitMask0;
+ } else {
+ /*--------------------------------------------------------------------
+ *--------------------------------------------------------------------*/
+ if ( exp < 0x3FFF ) {
+ if ( !((uiA64 & UINT64_C( 0x7FFFFFFFFFFFFFFF )) | uiA0) ) return a;
+ if ( exact ) softfloat_exceptionFlags |= softfloat_flag_inexact;
+ uiZ.v64 = uiA64 & packToF128UI64( 1, 0, 0 );
+ uiZ.v0 = 0;
+ switch ( roundingMode ) {
+ case softfloat_round_near_even:
+ if ( !(fracF128UI64( uiA64 ) | uiA0) ) break;
+ RT_FALL_THROUGH(); /* VBox */
+ case softfloat_round_near_maxMag:
+ if ( exp == 0x3FFE ) uiZ.v64 |= packToF128UI64( 0, 0x3FFF, 0 );
+ break;
+ case softfloat_round_min:
+ if ( uiZ.v64 ) uiZ.v64 = packToF128UI64( 1, 0x3FFF, 0 );
+ break;
+ case softfloat_round_max:
+ if ( !uiZ.v64 ) uiZ.v64 = packToF128UI64( 0, 0x3FFF, 0 );
+ break;
+#ifdef SOFTFLOAT_ROUND_ODD
+ case softfloat_round_odd:
+ uiZ.v64 |= packToF128UI64( 0, 0x3FFF, 0 );
+ break;
+#endif
+ }
+ goto uiZ;
+ }
+ /*--------------------------------------------------------------------
+ *--------------------------------------------------------------------*/
+ uiZ.v64 = uiA64;
+ uiZ.v0 = 0;
+ lastBitMask64 = (uint_fast64_t) 1<<(0x402F - exp);
+ roundBitsMask = lastBitMask64 - 1;
+ if ( roundingMode == softfloat_round_near_maxMag ) {
+ uiZ.v64 += lastBitMask64>>1;
+ } else if ( roundingMode == softfloat_round_near_even ) {
+ uiZ.v64 += lastBitMask64>>1;
+ if ( !((uiZ.v64 & roundBitsMask) | uiA0) ) {
+ uiZ.v64 &= ~lastBitMask64;
+ }
+ } else if (
+ roundingMode
+ == (signF128UI64( uiZ.v64 ) ? softfloat_round_min
+ : softfloat_round_max)
+ ) {
+ uiZ.v64 = (uiZ.v64 | (uiA0 != 0)) + roundBitsMask;
+ }
+ uiZ.v64 &= ~roundBitsMask;
+ lastBitMask0 = 0;
+ }
+ if ( (uiZ.v64 != uiA64) || (uiZ.v0 != uiA0) ) {
+#ifdef SOFTFLOAT_ROUND_ODD
+ if ( roundingMode == softfloat_round_odd ) {
+ uiZ.v64 |= lastBitMask64;
+ uiZ.v0 |= lastBitMask0;
+ }
+#endif
+ if ( exact ) softfloat_exceptionFlags |= softfloat_flag_inexact;
+ }
+ uiZ:
+ uZ.ui = uiZ;
+ return uZ.f;
+
+}
+