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ARM Compiler Reference
3-24 Copyright © 1999-2001 ARM Limited. All rights reserved. ARM DUI 0067D
Float
Floating-point quantities are stored in IEEE format:
•
float
values are represented by IEEE single-precision values
•
double
and
long
double
values are represented by IEEE double-precision values.
If
softvfp
,
vfp
, or
softvfp+vfp
is selected, for
double
and
long
double
quantities the word
containing the sign, the exponent, and the most significant part of the mantissa is stored
with the lower machine address in big-endian mode and at the higher address in
little-endian mode. See Operations on floating-point types on page 3-25 for more
information.
ARM implements an ANSI extension for floating-point constants (see Hexadecimal
floating-point constants on page 3-19).
Arrays and pointers
The following statements apply to all pointers to objects in C and C++, except pointers
to members:
• adjacent bytes have addresses that differ by one
• the macro
NULL
expands to the value 0
• casting between integers and pointers results in no change of representation
• the compiler warns of casts between pointers to functions and pointers to data
• the type
size_t
is defined as
unsigned int
• the type
ptrdiff_t
is defined as
signed int
.
3.3.3 Operations on basic data types
The ARM compilers perform the usual arithmetic conversions set out in relevant
sections of the C and C++ standards. The following sections document additional points
that relate to arithmetic operations. See also Statements on page B-7.
Operations on integral types
The following statements apply to operations on the integral types:
• All signed integer arithmetic uses a two's complement representation.
• Bitwise operations on signed integral types follow the rules that arise naturally
from two's complement representation. No sign extension takes place.
• Right shifts on signed quantities are arithmetic.
- 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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