ARM VERSION 1.2 Scheda Tecnica Pagina 220
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- Indice
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Valutato. / 5. Basato su recensioni clienti
Floating-point Support
5-22 Copyright © 1999-2001 ARM Limited. All rights reserved. ARM DUI 0067D
/* For all other invalid operations, raise SIGFPE as usual */
raise(SIGFPE);
}
Install the handler function as follows:
fenv_t env;
fegetenv(&env);
env.statusword |= FE_IEEE_MASK_INVALID;
env.invalid_handler = myhandler;
fesetenv(&env);
After the handler is installed, dividing 0.0 by 0.0 returns 1.0.
Exception trap handling by signals
If an exception is trapped but the trap handler address is set to
NULL
, a default trap
handler is used.
The default trap handler raises a
SIGFPE
signal. The default handler for
SIGFPE
prints an
error message and terminates the program.
If you trap
SIGFPE
, you can declare your signal handler function to have a second
parameter that tells you the type of floating-point exception that occurred. This feature
is provided for compatibility with Microsoft products. The values are
_FPE_INVALID
,
_FPE_ZERODIVIDE
,
_FPE_OVERFLOW
,
_FPE_UNDERFLOW
and
_FPE_INEXACT
. They are defined in
float.h
. For example:
void sigfpe(int sig, int etype) {
printf("SIGFPE (%s)\n",
etype == _FPE_INVALID ? "Invalid Operation" :
etype == _FPE_ZERODIVIDE ? "Divide by Zero" :
etype == _FPE_OVERFLOW ? "Overflow" :
etype == _FPE_UNDERFLOW ? "Underflow" :
etype == _FPE_INEXACT ? "Inexact Result" :
"Unknown");
}
signal(SIGFPE, (void(*)(int))sigfpe);
To generate your own
SIGFPE
signals with this extra information, you can call the
function
__rt_raise
instead of the ANSI function raise. In Example 5-1 on page 5-21,
instead of:
raise(SIGFPE);
it is better to code:
__rt_raise(SIGFPE, _FPE_INVALID);
- Developer Suite 1
- ARM Developer Suite 2
- Contents 3
- • Feedback on page xii 7
- About this book 8
- Preface 10
- Feedback 12
- Chapter 1 13
- Introduction 13
- 1.3 Linking compiled objects 17
- 1.4 Related utilities 18
- Chapter 2 19
- C and C++ Compilers 19
- 2.2 File usage 22
- 2.3 Command syntax 27
- Debug table format options 41
- Example 2-1 Double and float 46
- Chapter 3 57
- ARM Compiler Reference 57
- #pragma [no_]feature-name 58
- Example 3-1 Section naming 61
- Example 3-2 Pointer to packed 70
- Example 3-3 Packed structure 70
- 3.2 Language extensions 72
- Example 3-5 External access 75
- Example 3-7 Compiler error 76
- 0 1 2 3 83
- 4 5 7 8 83
- 9 10 11 12 83
- Bit number 85
- 3.4 Predefined macros 87
- Chapter 4 91
- -apcs /norwpi 95
- -apcs /rwpi 95
- The C and C++ Libraries 100
- -verbose 101
- 4.6.5 _get_lc_collate() 122
- Example 4-5 LC_COLLATE_DEF 125
- Example 4-6 LC_MONETARY_DEF 126
- Example 4-7 LC_NUMERIC_DEF 127
- 4.6.8 _get_lc_time() 128
- must return a pointer to a 128
- Example 4-9 LC_CTYPE_DEF 132
- Example 4-12 LC_TIME_DEF 134
- Example 4-13 LC_NUMERIC_DEF 136
- Example 4-14 LC_MONETARY_DEF 136
- Example 4-15 LC_INDEX_END 138
- Example 4-16 lconv structure 138
- __raise() 141
- Example 4-17 Heap_Descriptor 151
- Example 4-18 Heap_DescSize 152
- __user_libspace() 158
- __rt_stack_overflow_return 162
- __user_heap_extend() 163
- FILEHANDLE 168
- _sys_open() 168
- so that 172
- _clock_init() 175
- Mathematical functions 182
- Table 4-19 perror() messages 186
- Error Message 186
- 4.14 C library extensions 189
- Example 4-20 heapstats output 193
- -fpu none 196
- Chapter 5 199
- Floating-point Support 199
- -fpu vfp 200
- -fpu softvfp 200
- 25 22 19 18 206
- FZ RM Masks 206
- R RRR VFPVFP 206
- System ID Masks Sticky 208
- FPA onlyR R R 208
- Flag Operand type 217
- is declared in 221
- 5.4 The math library, mathlib 222
- 5.5 IEEE 754 arithmetic 228
- 63 52 5162 0 229
- Exp Frac 229
- Sample values 230
- Some sample 230
- 0x00800000 234
- 0x00400000 234
- 0x00000001 234
- Appendix A 237
- Via File Syntax 237
- A.1 Overview of via files 238
- A.2 Syntax 239
- Appendix B 241
- B.1 Implementation definition 242
- #include <stdio.h> 247
- Appendix C 249
- C.1 EC++ support 250
- C.2 Integral conversion 251
- Appendix D 257
- D.2 Internal limits 260
- Glossary 265
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Table des matières
TC-15LV1
1
Installation
10
TV
13
Subtitulos
15
TV/VIDEO
18
Chanal 6
19
Otro Ajuste
20
COMPLETO
21
SURROUND
26
Subtítulos
33
SLOW/SEARCH
38
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46
I love you
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Je t'aime
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00 00 00
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MENÚ AUDIO
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MBS012A0
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Table des matières
TC-15LV1
1
Installation
10
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14
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15
PROG. AUTO
17
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20
TV
29
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Sous-titres
33
SLOW/SEARCH
38
HelloHello
46
I love you
47
00 00 00
51
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MENU VIDÉO
55
MENU AUDIO
56
Dépannage
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Entretien
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MBS012A0
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