woo

silly.js

@@ -12,8 +12,10 @@ let shift = 4;
 let base = 2 ** (powBits - shift);
 
 // 16-bit lookup table
+let reduction = 0;
+
 // 12-bit lookup table
-let reduction = 4;
+//let reduction = 4;
 
 function toFixed(float) {
     return Math.round(float * base);
@@ -73,21 +75,39 @@ process.exit(1);
 */
 
 // now just try multipling numbers
+let deltas = 0;
+let count = 0;
+let deltaCount = 0;
+let results = 0;
+
+function round(n, x) {
+    return Math.round(x * n) / n;
+}
+
 while (true) {
     let a = Math.trunc(Math.random() * logEntries);
     let b = Math.trunc(Math.random() * logEntries);
+    let expected = a * b;
+    let result = mul(a, b);
 
-    let pExpected = a * b;
-    let p = mul(a, b);
-
-    let delta = Math.abs(p - pExpected);
+    let delta = Math.abs(result - expected);
     let epsilon = 1;
 
     if (delta >= epsilon) {
-        let percent = 100 * (delta / pExpected);
-        console.log(`${a} * ${b} = ${pExpected}, but got ${p} delta ${delta} ${Math.round(percent * 100) / 100}%`);
+        let percent = 100 * (delta / expected);
+        //console.log(`${a} * ${b} = ${expected}, but got ${result} delta ${delta} ${Math.round(percent * 100) / 100}%`);
+        deltas += delta;
+        deltaCount++;
     } else {
-        console.log(`${a} * ${b} = ${p}`);
+        //console.log(`${a} * ${b} = ${result}`);
+    }
+    count++;
+    if (count == 100) {
+        deltaAvg = deltas / deltaCount;
+        console.log(`${count - deltaCount} of ${count} ok -- ${deltaCount} off by avg ${round(10,deltaAvg)})`);
+        count = 0;
+        deltas = 0;
+        deltaCount = 0;
     }
 }