Run results for: Branchless vs Branched Angle Inversion

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/112.0.5615.46 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 112

Operating system: iOS 16.3

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
branched	14416630.0 Ops/sec
branchless	13384873.0 Ops/sec
branchless in-scope caching	13462218.0 Ops/sec
branchless out of scope caching	13025243.0 Ops/sec

Script Preparation code:

const PI = Math.PI;
function invertAngleBranch(angle) {
  if (angle + PI > PI) return (angle - PI)
   else return angle + PI 
};
function invertAngleBranchless(angle) {
  return (angle + PI > PI) * (angle - PI) + (angle + PI <= PI) * (angle + PI);
};
function invertAngleBranchlessC1(angle) {
  let tmp = angle + PI;
  return (tmp > PI) * (angle - PI) + (tmp <= PI) * tmp;
};
let tmp2 = NaN; //initialize with float for v8
function invertAngleBranchlessC2(angle) {
  tmp2 = angle + PI;
  return (tmp2 > PI) * (angle - PI) + (tmp2 <= PI) * tmp2;
};
var rnd = Math.random;

Tests:

branched
return invertAngleBranch(rnd());
branchless
return invertAngleBranchless(rnd());
branchless in-scope caching
return invertAngleBranchlessC1(rnd());
branchless out of scope caching
return invertAngleBranchlessC2(rnd());

Run results for: Branchless vs Branched Angle Inversion

branched

branchless

branchless in-scope caching

branchless out of scope caching