Hello
I have a simple question about inline asm.
suppose I have asm { push eax, 123 }
does it mean that it will have exactly this effect as in usual asm or
it's just a suggestion to the compiler (meaning that the compiled
program might probably use some other register in place of eax)
Thanks.
Ps. I do not have any intention to use inline asm. 5 2157
__PPS__ wrote: I have a simple question about inline asm. suppose I have asm { push eax, 123 }
Actually, you're supposed to have
asm ( "push eax, 123" ) ;
(IOW, inside the parentheses there should be a string literal),
according to the Standard, subclause 7.4. Any other form, like
asm { <actual assembly commands> }
is probably an extension provided by the compiler.
does it mean that it will have exactly this effect as in usual asm or it's just a suggestion to the compiler (meaning that the compiled program might probably use some other register in place of eax)
The meaning of the asm definition is implementation-defined. The
usual purpose is to convey something to the assembler, often insert
a short piece of assembly code into the function. And, yes, usually
the code is assembled *exactly* as written.
Thanks.
Ps. I do not have any intention to use inline asm.
LOL... Why the question, then?
V
> > Thanks. Ps. I do not have any intention to use inline asm.
LOL... Why the question, then?
Victor, it's because my good friend Artur says that asm is more
`powerful` when it comes to precise control of which register should be
used etc etc. He says that asm( "whatever") blocks only give compiler a
tip but aren't for sure included as-is (similar to inline keyword)
Thanks pa**********@gm ail.com wrote: Victor, it's because my good friend Artur says that asm is more `powerful` when it comes to precise control of which register should be used etc etc. He says that asm( "whatever") blocks only give compiler a tip but aren't for sure included as-is (similar to inline keyword)
The standard says:
"7.4 The asm declaration
An asm declaration has the form
asm-definition:
asm ( string-literal ) ;
The meaning of an asm declaration is implementation-defined. [Note: Typically it is used
to pass information through the implementation to an assembler. ]"
So its behaviour is implementation-defined. However in most compilers it is used to pass
instructions directly to the assembler. In other words, in most compilers the passed
instructions are used, and are not considered a suggestion.
--
Ioannis Vranos http://www23.brinkster.com/noicys
"__PPS__" <bl******@mail. ru> wrote in message
news:72******** *************** ***@posting.goo gle.com... I have a simple question about inline asm. suppose I have asm { push eax, 123 } does it mean that it will have exactly this effect as in usual asm or it's just a suggestion to the compiler (meaning that the compiled program might probably use some other register in place of eax)
Compilers that implement an inline assembler usually implement it as exactly
the instructions listed. After all, that's the whole point of having one.
-Walter www.digitalmars.com/ctg/ctgInlineAsm.html C++ inline assembler www.digitalmars.com/d/iasm.html D inline assembler
Thanks for the info, now I'm sure about this topic :) This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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