ASM access to array
Matthias Pleh
sufu at alter.com
Wed Feb 2 03:23:42 PST 2011
As bearophile notet, unittest are always good!!
But for the start, I always liked to make some pretty-printing functions ...
... so this is my version
import std.stdio;
uint rotl_d(uint value,ubyte rotation){
return (value<<rotation) | (value>>(value.sizeof*8 - rotation));
}
uint rotl_asm(uint value,ubyte rotation){
asm{
mov EAX, value; // get first argument
mov CL , rotation; // how many bits to move
rol EAX, CL;
}// return with result in EAX
}
void bin_writeln(string info,uint value, bool nl){
writefln("%1s: %02$32b%3$s",info,value,nl?"\n":"");
}
int main(string[] argv){
uint a=0xc0def00d;
bin_writeln("value a",a ,false);
bin_writeln("value b",rotl_d(a,1),true);
//
bin_writeln("value a",a ,false);
bin_writeln("value b",rotl_asm(a,1),true);
return 0;
}
greets
Matthias
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