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ARM Compiler Reference
ARM DUI 0067D Copyright © 1999-2001 ARM Limited. All rights reserved. 3-17
Identifiers
The
$
character is a legal character in identifiers.
Void returns and arguments
Any
void
type, including a typedef to
void
, is permitted as the return type in a function
declaration, or the indicator that a function takes no argument. For example, the
following is permitted:
typedef void VOID;
int fn(VOID); // Error in -strict C and C++
VOID fn(int x); // Error in -strict C
long long
ARM C and C++ compilers support 64-bit integer types through the type specifier
long
long
and
unsigned long long
. They behave analogously to
long
and
unsigned long
with
respect to the usual arithmetic conversions.
long long
is a synonym for
__int64
.
Integer constants can have:
•an
ll
suffix to force the type of the constant to
long long
, if it fits, or to
unsigned
long long
if it does not fit
•an
llu
(or
ull
) suffix to force the type of the constant to
unsigned long long
.
Format specifiers for
printf()
and
scanf()
can include
ll
to specify that the following
conversion applies to a
long long
argument, as in
%lld
or
%llu
.
Also, a plain integer constant is of type
long
long
or
unsigned
long
long
if its value is
large enough. There is a warning message from the compiler indicating the change. For
example, in strict ANSI C 2147483648 has type
unsigned long
. In ARM C and C++ it
has the type
long long
. One consequence of this is the value of an expression such as:
2147483648 > –1
is 0 in strict C and C++, and 1 in ARM C and C++.
The following restrictions apply to
long long
:
•
long long
enumerators are not available.
• The controlling expression of a
switch
statement cannot have (
unsigned
)
long
long
type. Consequently case labels must also have values that can be contained
in a variable of type
unsigned
long
.
- 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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