Run results for: different getint methods

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.1 Safari/605.1.15

Browser: Safari 16

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 months ago

Test name	Executions per second
Func table style	1976940.5 Ops/sec
Switch style	1733062.5 Ops/sec
Func table style 2	8170212.5 Ops/sec
All inline	7407422.0 Ops/sec

Script Preparation code:

const buffer = new ArrayBuffer(644);
const view = new DataView(buffer);
let offs = 0;
let O=0;
view.setInt8(offs, 33, true);offs+=1;
view.setInt8(offs, 21, true);offs+=1;
view.setInt8(offs, 25, true);offs+=1;
view.setInt8(offs, 40, true);offs+=1;
for (let i = 0; i < 40; ++i) {
  view.setInt32(offs, 33, true);offs+=4;
  view.setInt32(offs, 21, true);offs+=4;
  view.setInt32(offs, 25, true);offs+=4;
  view.setInt32(offs, 40, true);offs+=4;
}


let F=[
  (a,b)=>{let c=a.getInt8(b,true);return [c,b+1];},
  (a,b)=>{let c=a.getInt16(b,true);return [c,b+2];},
  (a,b)=>{let c=a.getInt32(b,true);return [c,b+4];},
  (a,b)=>{let c=a.getInt64(b,true);return [c,b+8];}
];

let Z=[
  (a)=>{let c=a.getInt8(O,true);O+=1;return c;},
  (a)=>{let c=a.getInt16(O,true);O+=2;return c;},
  (a)=>{let c=a.getInt32(O,true);O+=4;return c;},
  (a)=>{let c=a.getInt64(O,true);O+=8;return c;}
];

let G=(a,b,c)=>{
  let d=0;
  switch(c){
    case 0:
      d=a.getInt8(b,true);b+=1;break;
    case 1:
      d=a.getInt16(b,true);b+=2;break;
    case 2:
      d=a.getInt32(b,true);b+=4;break;
    case 3:
      d=a.getInt64(b,true);b+=8;break;
  }
  return [d,b];
}

Tests:

All inline
let H=Array(4),k=0; let z=0; H[0]=view.getInt8(z,true);++z; H[1]=view.getInt8(z,true);++z; H[2]=view.getInt8(z,true);++z; k=view.getInt8(z,true);++z; H[3]=Array(k); for (let i = 0; i < k; ++i){ H[3][i]=Array(4); H[3][i][0]=view.getInt32(z,true); z+=4; H[3][i][1]=view.getInt32(z,true); z+=4; H[3][i][2]=view.getInt32(z,true); z+=4; H[3][i][3]=view.getInt32(z,true); z+=4; }
All inline 2
let H=Array(4),k=0; let z=0; H[0]=view.getInt8(z,true);++z; H[1]=view.getInt8(z,true);++z; H[2]=view.getInt8(z,true);++z; k=view.getInt8(z,true);++z; let y=Array(k); for (let i = 0; i < k; ++i){ y[i]=Array(4); y[i][0]=view.getInt32(z,true); z+=4; y[i][1]=view.getInt32(z,true); z+=4; y[i][2]=view.getInt32(z,true); z+=4; y[i][3]=view.getInt32(z,true); z+=4; } H[3]=y;
all inline 3
let H=Array(4),k=0; let z=0; H[0]=view.getInt8(z,true);++z; H[1]=view.getInt8(z,true);++z; H[2]=view.getInt8(z,true);++z; k=view.getInt8(z,true);++z; let y=Array(k); for (let i = 0; i < k; ++i){ let x=Array(4); x[0]=view.getInt32(z,true); z+=4; x[1]=view.getInt32(z,true); z+=4; x[2]=view.getInt32(z,true); z+=4; x[3]=view.getInt32(z,true); z+=4; y[i]=x; } H[3]=y;

Run results for: different getint methods

All inline

All inline 2

all inline 3