VirtualBox

source: vbox/trunk/src/libs/softfloat-3e/source/f16_to_extF80M.c@ 99863

Last change on this file since 99863 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: 3.9 KB
Line 
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 The Regents of the University of
8California. 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
44#ifdef SOFTFLOAT_FAST_INT64
45
46void f16_to_extF80M( float16_t a, extFloat80_t *zPtr SOFTFLOAT_STATE_DECL_COMMA )
47{
48
49 *zPtr = f16_to_extF80( a SOFTFLOAT_STATE_ARG_COMMA );
50
51}
52
53#else
54
55void f16_to_extF80M( float16_t a, extFloat80_t *zPtr SOFTFLOAT_STATE_DECL_COMMA )
56{
57 struct extFloat80M *zSPtr;
58 union ui16_f16 uA;
59 uint16_t uiA;
60 bool sign;
61 int_fast8_t exp;
62 uint16_t frac;
63 struct commonNaN commonNaN;
64 uint_fast16_t uiZ64;
65 uint32_t uiZ32;
66 struct exp8_sig16 normExpSig;
67
68 /*------------------------------------------------------------------------
69 *------------------------------------------------------------------------*/
70 zSPtr = (struct extFloat80M *) zPtr;
71 uA.f = a;
72 uiA = uA.ui;
73 sign = signF16UI( uiA );
74 exp = expF16UI( uiA );
75 frac = fracF16UI( uiA );
76 /*------------------------------------------------------------------------
77 *------------------------------------------------------------------------*/
78 if ( exp == 0x1F ) {
79 if ( frac ) {
80 softfloat_f16UIToCommonNaN( uiA, &commonNaN SOFTFLOAT_STATE_ARG_COMMA );
81 softfloat_commonNaNToExtF80M( &commonNaN, zSPtr );
82 return;
83 }
84 uiZ64 = packToExtF80UI64( sign, 0x7FFF );
85 uiZ32 = 0x80000000;
86 goto uiZ;
87 }
88 /*------------------------------------------------------------------------
89 *------------------------------------------------------------------------*/
90 if ( ! exp ) {
91 if ( ! frac ) {
92 uiZ64 = packToExtF80UI64( sign, 0 );
93 uiZ32 = 0;
94 goto uiZ;
95 }
96 normExpSig = softfloat_normSubnormalF16Sig( frac );
97 exp = normExpSig.exp;
98 frac = normExpSig.sig;
99 }
100 /*------------------------------------------------------------------------
101 *------------------------------------------------------------------------*/
102 uiZ64 = packToExtF80UI64( sign, exp + 0x3FF0 );
103 uiZ32 = 0x80000000 | (uint32_t) frac<<21;
104 uiZ:
105 zSPtr->signExp = uiZ64;
106 zSPtr->signif = (uint64_t) uiZ32<<32;
107
108}
109
110#endif
111
Note: See TracBrowser for help on using the repository browser.

© 2024 Oracle Support Privacy / Do Not Sell My Info Terms of Use Trademark Policy Automated Access Etiquette