How to implement look up table in assembly?

Hi all,

I have a lookup table:

Table:
[-inf,0.3]  -->  100.0
[0.3,0.4]  -->  200.0
[0.4,0.5]  -->  300.0
[0.5,0.6]  -->  400.0
[0.6,+inf] -->  500.0


i.e,
FuncLookUp(-1.0 ) returns 100.0
FuncLookUp(0.35 ) returns 200.0
FuncLookUp(0.51 ) returns 400.0
FuncLookUp(11.0 ) returns 500.0 , etc

in C code, it would look like:

static float table[]={
100.0f, 200.0f, 300.0f, 400.0f, 500.0f
};

static float minValue=0.3;
static float step=0.1;
static float maxValue=0.6;
static float maxRange=maxValue-minValue;
static int tableSize=5;

inline FuncLookUp(float x){

x-=minValue;
if (x<0) return table[0];
if (x>maxRange) return table[tableSize-1];

int idx= fastRound(x/maxRange*tableSize);
return table[idx];
}


How can I write FuncLookUp in assembly?
thank you!