math - List of clone functions for bit operators in JavaScript? -

javascript integers can go 2^53, yet bit operations go 2^32. need perform bit operations on numbers between 2^32 , 2^53, have write substitute functions bit operations:

here's have far:

function lshift(num, bits) {   return num * math.pow(2, bits); }  function rshift(num, bits) {   return math.floor(num / math.pow(2, bits)); } 

is best way implement shift functions?

i need implement & , |. in code have & 127 , 128 i'm not sure of how so.

i don't need ~ or ^, included in answer completeness guess.

one general remark: it seems make sense keep numbers positive avoid issues 1-complement.

for lshift function, not sure if pay off checks if shift won't overflow 32 bit, , use regular shift operation in case: it might reduce complex operations, add checks , branching...

function and(a, b) {   var low = & b & 0x7fffffff;   if (a <= 0x7fffffff || b <= 0x7fffffff) {     return low;   }   var hi = rshift(a, 31) & rshift(b, 31);   return low + lshift(hi, 31); }  function or(a, b) {   var low = (a | b) & 0x7fffffff;   if (a <= 0x7fffffff && b <= 0x7fffffff) {     return low;   }   var hi = rshift(a, 31) | rshift(b, 31);   return low + lshift(hi, 31); }  function xor(a, b) {   var low = (a ^ b) & 0x7fffffff;   if (a <= 0x7fffffff && b <= 0x7fffffff) {     return low;   }   var hi = rshift(a, 31) ^ rshift(b, 31);   return low + lshift(hi, 31); }  function rshift(num, bits) {   return num <= 0x7fffffff ? num >> bits :        math.floor(num / math.pow(2, bits)); } 

edit: fixed bug in or, added xor