CODEWITHSUNDEEP
cembedded
RedX
RedX

Reputation: 15175

Is an "asm Macro" part of standard C?

We develop code for embedded PowerPC architectures.

Our compiler supports something called asm Macros.

Here an excerpt from the handbook:

asm Macro Syntax

An asm macro definition looks much like a function definition, including a return type and parameter list, and function body.

The syntax is:

asm [volatile] [return-type] macro-name ( [ parameter-list ] )
 {
 % storage-mode-list (must start in column 1)
 ! register-list     (“!” must be first non-whitespace)
   asm-code      
 } (must start in column 1

Is this standard C? My compiler does not list this as an extension in his handbook.

Clarification after first answer:

I'm aware the part withen { } is not defined by standard C. I meant the function like construct after asm and before the closing ).

Upvotes: 3

Views: 536

Answers (2)

Clifford
Clifford

Reputation: 93534

The asm keyword is not standard in C, it is reserved in C++, but in both cases the the syntax is implementation specific as described here:

asm-declaration gives the ability to embed assembly language source code within a C++ program. This declaration is conditionally-supported and implementation defined, meaning that it may not be present and, even when provided by the implementation, it does not have a fixed meaning.

It's use to define a macro is new to me and interesting however.

Upvotes: 0

Carl Norum
Carl Norum

Reputation: 225042

No, it is not standard C. Anything architecture-specific, like assembly code, is going to be an implementation-specific extension just about by definition.

Upvotes: 4

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