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1/*
2 * float.h
3 * This file has no copyright assigned and is placed in the Public Domain.
4 * This file is a part of the mingw-runtime package.
5 * No warranty is given; refer to the file DISCLAIMER within the package.
6 *
7 * Constants related to floating point arithmetic.
8 *
9 * Also included here are some non-ANSI bits for accessing the floating
10 * point controller.
11 *
12 * NOTE: GCC provides float.h, but it doesn't include the non-standard
13 * stuff for accessing the fp controller. We include_next the
14 * GCC-supplied header and just define the MS-specific extensions
15 * here.
16 *
17 */
18
19#ifndef _MINGW_FLOAT_H_
20#define _MINGW_FLOAT_H_
21
22#if defined(__GNUC__)
23#include "mingw32/gcc_float.h"
24#elif defined(_MSC_VER)
25#include "msc/msc_float.h"
26#else
27#error
28#endif
29
30#include <corecrt.h>
31
32/*
33 * Functions and definitions for controlling the FPU.
34 */
35#ifndef __STRICT_ANSI__
36
37/* TODO: These constants are only valid for x86 machines */
38
39/* Control word masks for unMask */
40#define _MCW_EM 0x0008001F /* Error masks */
41#define _MCW_IC 0x00040000 /* Infinity */
42#define _MCW_RC 0x00000300 /* Rounding */
43#define _MCW_PC 0x00030000 /* Precision */
44#define _MCW_DN 0x03000000 /* Denormal */
45
46/* Control word values for unNew (use with related unMask above) */
47#define _EM_INVALID 0x00000010
48#define _EM_DENORMAL 0x00080000
49#define _EM_ZERODIVIDE 0x00000008
50#define _EM_OVERFLOW 0x00000004
51#define _EM_UNDERFLOW 0x00000002
52#define _EM_INEXACT 0x00000001
53#define _IC_AFFINE 0x00040000
54#define _IC_PROJECTIVE 0x00000000
55#define _RC_CHOP 0x00000300
56#define _RC_UP 0x00000200
57#define _RC_DOWN 0x00000100
58#define _RC_NEAR 0x00000000
59#define _PC_24 0x00020000
60#define _PC_53 0x00010000
61#define _PC_64 0x00000000
62#define _DN_SAVE 0x00000000
63#define _DN_FLUSH 0x01000000
64#define _DN_FLUSH_OPERANDS_SAVE_RESULTS 0x02000000
65#define _DN_SAVE_OPERANDS_FLUSH_RESULTS 0x03000000
66
67/* These are also defined in Mingw math.h, needed to work around
68 GCC build issues. */
69/* Return values for fpclass. */
70#ifndef __MINGW_FPCLASS_DEFINED
71#define __MINGW_FPCLASS_DEFINED 1
72#define _FPCLASS_SNAN 0x0001 /* Signaling "Not a Number" */
73#define _FPCLASS_QNAN 0x0002 /* Quiet "Not a Number" */
74#define _FPCLASS_NINF 0x0004 /* Negative Infinity */
75#define _FPCLASS_NN 0x0008 /* Negative Normal */
76#define _FPCLASS_ND 0x0010 /* Negative Denormal */
77#define _FPCLASS_NZ 0x0020 /* Negative Zero */
78#define _FPCLASS_PZ 0x0040 /* Positive Zero */
79#define _FPCLASS_PD 0x0080 /* Positive Denormal */
80#define _FPCLASS_PN 0x0100 /* Positive Normal */
81#define _FPCLASS_PINF 0x0200 /* Positive Infinity */
82#endif /* __MINGW_FPCLASS_DEFINED */
83
84/* _statusfp bit flags */
85#define _SW_INEXACT 0x00000001 /* inexact (precision) */
86#define _SW_UNDERFLOW 0x00000002 /* underflow */
87#define _SW_OVERFLOW 0x00000004 /* overflow */
88#define _SW_ZERODIVIDE 0x00000008 /* zero divide */
89#define _SW_INVALID 0x00000010 /* invalid */
90#define _SW_DENORMAL 0x00080000 /* denormal status bit */
91
92/* invalid subconditions (_SW_INVALID also set) */
93#define _SW_UNEMULATED 0x0040 /* unemulated instruction */
94#define _SW_SQRTNEG 0x0080 /* square root of a neg number */
95#define _SW_STACKOVERFLOW 0x0200 /* FP stack overflow */
96#define _SW_STACKUNDERFLOW 0x0400 /* FP stack underflow */
97
98/* Floating point error signals and return codes */
99#define _FPE_INVALID 0x81
100#define _FPE_DENORMAL 0x82
101#define _FPE_ZERODIVIDE 0x83
102#define _FPE_OVERFLOW 0x84
103#define _FPE_UNDERFLOW 0x85
104#define _FPE_INEXACT 0x86
105#define _FPE_UNEMULATED 0x87
106#define _FPE_SQRTNEG 0x88
107#define _FPE_STACKOVERFLOW 0x8a
108#define _FPE_STACKUNDERFLOW 0x8b
109#define _FPE_EXPLICITGEN 0x8c /* raise( SIGFPE ); */
110
111#ifndef RC_INVOKED
112
113#ifdef __cplusplus
114extern "C" {
115#endif
116
117/* Set the FPU control word as cw = (cw & ~unMask) | (unNew & unMask),
118 * i.e. change the bits in unMask to have the values they have in unNew,
119 * leaving other bits unchanged. */
120
121__MINGW_NOTHROW
122_CRTIMP
123unsigned int
124__cdecl
125_controlfp(
126 _In_ unsigned int unNew,
127 _In_ unsigned int unMask);
128
129__MINGW_NOTHROW
130_CRTIMP
131unsigned int
132__cdecl
133_control87(
134 _In_ unsigned int unNew,
135 _In_ unsigned int unMask);
136
137__MINGW_NOTHROW _CRTIMP unsigned int __cdecl _clearfp (void); /* Clear the FPU status word */
138__MINGW_NOTHROW _CRTIMP unsigned int __cdecl _statusfp (void); /* Report the FPU status word */
139#define _clear87 _clearfp
140#define _status87 _statusfp
141
142
143/*
144 MSVCRT.dll _fpreset initializes the control register to 0x27f,
145 the status register to zero and the tag word to 0FFFFh.
146 This differs from asm instruction finit/fninit which set control
147 word to 0x37f (64 bit mantissa precison rather than 53 bit).
148 By default, the mingw version of _fpreset sets fp control as
149 per fninit. To use the MSVCRT.dll _fpreset, include CRT_fp8.o when
150 building your application.
151*/
152__MINGW_NOTHROW void __cdecl _fpreset (void);
153__MINGW_NOTHROW void __cdecl fpreset (void);
154
155/* Global 'variable' for the current floating point error code. */
156__MINGW_NOTHROW _CRTIMP int * __cdecl __fpecode(void);
157#define _fpecode (*(__fpecode()))
158
159/*
160 * IEEE recommended functions. MS puts them in float.h
161 * but they really belong in math.h.
162 */
163
164_Check_return_
165__MINGW_NOTHROW
166_CRTIMP
167double
168__cdecl
169_chgsign(
170 _In_ double);
171
172_Check_return_
173__MINGW_NOTHROW
174_CRTIMP
175double
176__cdecl
177_copysign(
178 _In_ double,
179 _In_ double);
180
181_Check_return_
182__MINGW_NOTHROW
183_CRTIMP
184double
185__cdecl
186_logb(
187 _In_ double);
188
189_Check_return_
190__MINGW_NOTHROW
191_CRTIMP
192double
193__cdecl
194_nextafter(
195 _In_ double,
196 _In_ double);
197
198_Check_return_
199__MINGW_NOTHROW
200_CRTIMP
201double
202__cdecl
203_scalb(
204 _In_ double,
205 _In_ long);
206
207_Check_return_
208__MINGW_NOTHROW
209_CRTIMP
210int
211__cdecl
212_finite(
213 _In_ double);
214
215_Check_return_
216__MINGW_NOTHROW
217_CRTIMP
218int
219__cdecl
220_fpclass(
221 _In_ double);
222
223_Check_return_
224__MINGW_NOTHROW
225_CRTIMP
226int
227__cdecl
228_isnan(
229 _In_ double);
230
231#ifdef __cplusplus
232}
233#endif
234
235#endif /* Not RC_INVOKED */
236
237#endif /* Not __STRICT_ANSI__ */
238
239#endif /* _MINGW_FLOAT_H_ */