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#1
May 5th, 2003, 11:38 PM
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using assembly with g++
how do enter an assembly block? this is what im used to doing:
Code:
int main(int argc, char *argv[])
{
char a = 'a';
_asm
{
movl a,EAX;
and 0x01000001,EAX;
mov EAX,a;
}
printf("%x\n",a);
return 1;
}
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#2
May 6th, 2003, 01:05 AM
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#3
May 6th, 2003, 09:33 AM
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It appears to me that it may vary between implementations of g++ what the syntax will be and whether inline assembly is even supported.
At http://cs.wwc.edu/~aabyan/Unix/Assembly.html I found instructions for inline assembly with g++, but it seems more DJGPP-oriented. Their code would not compile with my MinGW gcc nor g++; it would not even recognize the asm keyword. I also could find no reference to assembly in the LibC help file. On my Redhat7 box, my version 2.96 gcc did recognize asm, but I had some compile errors. So you might have to do a bit of testing and searching for your particular g++. The key appears to be that you shouldn't give up too quickly if you run into problems.
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#4
May 6th, 2003, 10:35 AM
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thanks scorpions, that answered my question. also made me realize assembly is a lot different than im used to, (not to mention the pain of writing each line like this: asm("movl a,%eax"); )
Last edited by infamous41md : May 6th, 2003 at 11:18 AM.
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#5
May 7th, 2003, 10:42 AM
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Quote:
You should be able to write multiple lines of assembly code in a single asm statement; eg: Code:
asm("incl x
movl x, %eax
imull y
movl %eax,x
");
See whether your compiler requires a different syntax for this.
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