HEAP8 benchmark in JS and Python

a.js

var data = new ArrayBuffer(1024);
HEAP8 = new Int8Array(data);
HEAP32 = new Int32Array(data);

for (var i = 0; i < 1024; i++) {
  HEAP8[i] = (i & 17);
}

for (var n = 0; n < 1024 * 500; n++) {
  for (var i = 0; i < 256; i++) {
    HEAP32[i] = HEAP32[(i + 37) & 255] + i;
  }
}

var total = 0;
for (var i = 0; i < 1024; i++) {
  total = (total + (HEAP8[i] * HEAP8[i])) & 0xff;
}
console.log(total);

a.py

data = bytearray(1024)
memory = memoryview(data).cast('B')
HEAP8 = memory.cast('b')
HEAP32 = memory.cast('i')

for i in range(0, 1024):
  HEAP8[i] = (i & 17)

for n in range(0, 1024 * 500):
  for i in range(0, 256):
    HEAP32[i] = HEAP32[(i + 37) & 255] + i

total = 0;
for i in range(1024):
  total = (total + (HEAP8[i] * HEAP8[i])) & 0xff

print(total)