|
|||
| Products Download Events Support Videos | |||
Technical Support
On-Line Manuals
Compiler Reference Guide
Conventions and Feedback
Introduction
Compiler Command-line Options
Language Extensions
Preprocessor extensions
#assert
#include_next
#unassert
#warning
C99 language features available in C90
// comments
Subscripting struct
Flexible array members
C99 language features available in C++ and C90
Variadic macros
long long
restrict
Hexadecimal floats
Standard C language extensions
Constant expressions
Array and pointer extensions
Block scope function declarations
Dollar signs in identifiers
Top-level declarations
Benign redeclarations
External entities
Function prototypes
Standard C++ language extensions
? operator
Declaration of a class member
friend
Read/write constants
Scalar type constants
Specialization of nonmember function templates
Type conversions
Standard C and Standard C++ language extensions
Address of a register variable
Arguments to functions
Anonymous classes, structures and unions
Assembler labels
Empty declaration
Hexadecimal floating-point constants
Incomplete enums
Integral type extensions
Label definitions
Long float
Nonstatic local variables
Structure, union, enum, and bitfield extensions
Compiler-specific Features
C and C++ Implementation Details
Semihosting
ARMv6 SIMD Instruction Intrinsics
Via File Syntax
Standard C Implementation Definition
Standard C++ Implementation Definition
C and C++ Compiler Implementation Limits
Compiler Reference Guide
long long
| |||
| Home > Language Extensions > long long | |||
The ARM compiler supports 64-bit integer types through the
type specifiers long long and unsigned long long.
They behave analogously to long and unsigned
long with respect to the usual arithmetic conversions. __int64 is
a synonym for long long.
Integer constants can have:
an
llsuffix to force the type of the constant to long long, if it fits, or to unsigned long long if it does not fita
ullorllusuffix 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 1990 ISO Standard 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
This expression evaluates to 0 in strict C and C++, and to 1 in ARM C and C++.
The long long types are accommodated in the usual arithmetic conversions.
See also| Copyright © 2007-2008, 2011-2012 ARM. All rights reserved. | ARM DUI 0376D |
| Non-Confidential | ID062912 |
 PDF version | |
| Home > Language Extensions > long long |
ProductsDevelopment Tools |
Hardware & Collateral |
Downloads |
Support |
Buy |
|
 |
|||
