Altera Nios II C2H Compiler - Manual (Page 125)

Altera Corporation 9.1 7–1
November 2009
7. ANSI C Compliance and
Restrictions
Introduction The Nios II C-to-Hardware Acceleration (C2H) Compiler supports a large
subset of the ANSI C language as described in Chapter 5 and Chapter 6
of the ISO/IEC 9899:1999(E) Specification. The current Nios II
C2H Compiler does not support the C++ programming language or the
library functions described in Chapter 7 of the ISO/IEC 9899:1999(E)
Specification.
This chapter describes Nios II C2H Compiler restrictions, including
unsupported ANSI C language syntax, semantics, and constraints.
Language This section refers to Chapter 6 of the ISO/IEC 9899:1999(E) Specification.
Section and paragraph numbers from the ISO/IEC 9899:1999(E)
Specification are cited in parentheses.
Declarations
The C2H Compiler supports the majority of data types used in the C
programming language. The following sections describe C2H restrictions
on C declarations.
Unsupported Types (Section 6.7.2, Paragraph 1)
The following types are not supported by the C2H Compiler:
■
float - section 6.3.1.5
■
double - section 6.3.1.5
■
_Complex – section 6.3.1.7
■ _Bool – section 6.3.1.2
■ _Imaginary – section 6.3.1.7
The following types are supported if specific
conditions are met:
■ Floating constants are supported only after casting to a supported
type.
For example, the following code casts π to an integer constant:
constant int pi - (int) 3.142957142957;