Assembly Language Examples

Min using cmovle

This code example makes use of the cmovle assembly instruction to compare two 64-bit integer values and return the minimum between integer variables a and b. This code such as this can be useful to reduce branch prediction misses.

min :: (a: int, b: int) -> int {
    ret: int;
    #asm {
        cmp.64     a, b;
        mov.64     ret, b;
        cmovle.64  ret, a;
    }
    return ret;
}

Max using cmovge

This code example makes use of the cmovge assembly instruction to compare two 64-bit integer values and return the maximum between integer variables a and b. This code such as this can be useful to reduce branch prediction misses.

max :: (a: int, b: int) -> int {
    ret: int;
    #asm {
        cmp.64     a, b;
        mov.64     ret, b;
        cmovge.64  ret, a;
    }
    return ret;
}

Abs with cmovs

This code example makes use of the cmovs assembly instruction to compare a value with its negation and return the absolute value of a particular integer number. This code such as this can be useful to reduce branch prediction misses.

abs :: (a: int) -> int {
    ret: int;
    #asm {
        mov     ret, a;
        neg     ret;
        cmovs   ret, a;
    }
    return ret;
}