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source: vbox/trunk/src/libs/softfloat-3e/source/s_roundToUI32.c@ 97234

Last change on this file since 97234 was 94558, checked in by vboxsync, 3 years ago

VMM/IEM,libs/softfloat: Don't use global variables in SoftFloat, pass in a state pointer to (almost) all functions instead. Started on fsqrt instruction implementation. bugref:9898

  • Property svn:eol-style set to native
File size: 3.6 KB
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1
2/*============================================================================
3
4This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
5Package, Release 3e, by John R. Hauser.
6
7Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the
8University of California. All rights reserved.
9
10Redistribution and use in source and binary forms, with or without
11modification, are permitted provided that the following conditions are met:
12
13 1. Redistributions of source code must retain the above copyright notice,
14 this list of conditions, and the following disclaimer.
15
16 2. Redistributions in binary form must reproduce the above copyright notice,
17 this list of conditions, and the following disclaimer in the documentation
18 and/or other materials provided with the distribution.
19
20 3. Neither the name of the University nor the names of its contributors may
21 be used to endorse or promote products derived from this software without
22 specific prior written permission.
23
24THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
25EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
26WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
27DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
28DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
29(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
31ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34
35=============================================================================*/
36
37#include <stdbool.h>
38#include <stdint.h>
39#include "platform.h"
40#include "internals.h"
41#include "specialize.h"
42#include "softfloat.h"
43
44uint_fast32_t
45 softfloat_roundToUI32(
46 bool sign, uint_fast64_t sig, uint_fast8_t roundingMode, bool exact SOFTFLOAT_STATE_DECL_COMMA)
47{
48 uint_fast16_t roundIncrement, roundBits;
49 uint_fast32_t z;
50
51 /*------------------------------------------------------------------------
52 *------------------------------------------------------------------------*/
53 roundIncrement = 0x800;
54 if (
55 (roundingMode != softfloat_round_near_maxMag)
56 && (roundingMode != softfloat_round_near_even)
57 ) {
58 roundIncrement = 0;
59 if ( sign ) {
60 if ( !sig ) return 0;
61 if ( roundingMode == softfloat_round_min ) goto invalid;
62#ifdef SOFTFLOAT_ROUND_ODD
63 if ( roundingMode == softfloat_round_odd ) goto invalid;
64#endif
65 } else {
66 if ( roundingMode == softfloat_round_max ) roundIncrement = 0xFFF;
67 }
68 }
69 roundBits = sig & 0xFFF;
70 sig += roundIncrement;
71 if ( sig & UINT64_C( 0xFFFFF00000000000 ) ) goto invalid;
72 z = sig>>12;
73 if (
74 (roundBits == 0x800) && (roundingMode == softfloat_round_near_even)
75 ) {
76 z &= ~(uint_fast32_t) 1;
77 }
78 if ( sign && z ) goto invalid;
79 if ( roundBits ) {
80#ifdef SOFTFLOAT_ROUND_ODD
81 if ( roundingMode == softfloat_round_odd ) z |= 1;
82#endif
83 if ( exact ) softfloat_exceptionFlags |= softfloat_flag_inexact;
84 }
85 return z;
86 /*------------------------------------------------------------------------
87 *------------------------------------------------------------------------*/
88 invalid:
89 softfloat_raiseFlags( softfloat_flag_invalid SOFTFLOAT_STATE_ARG_COMMA );
90 return sign ? ui32_fromNegOverflow : ui32_fromPosOverflow;
91
92}
93
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