GeezerVison

'use strict';

function getPropClassic(obj) {
  return obj && obj.prop;
}

function getPropOptional(obj) {
  return obj?.prop;
}

const obj = { prop: 42 };

function testGetPropClassic(obj) {
  return getPropClassic(obj);
}

function testGetPropOptional(obj) {
  return getPropOptional(obj);
}

for (let i = 0; i < 1e6; i++) {
  testGetPropClassic(obj);
  testGetPropOptional(obj);
}

> node --trace-turbo-inlining bench.js
Considering 000002D5A0AE59D8 {0x004b3832c8e1 <SharedFunctionInfo testGetPropClassic>} for inlining with 000002D5A0AE59E8 {0x004b3832d821 <FeedbackVector[2]>}
Inlining small function(s) at call site #45:JSCall
Inlining 000002D5A0AE59D8 {0x004b3832c8e1 <SharedFunctionInfo testGetPropClassic>} into 000002D5A0AE4A98 {0x004b3832c779 <SharedFunctionInfo>}
Considering 000002D5A0AE63A8 {0x004b3832c841 <SharedFunctionInfo getPropClassic>} for inlining with 000002D5A0AE63B8 {0x004b3832d7e1 <FeedbackVector[2]>}
Inlining small function(s) at call site #80:JSCall
Inlining 000002D5A0AE63A8 {0x004b3832c841 <SharedFunctionInfo getPropClassic>} into 000002D5A0AE4A98 {0x004b3832c779 <SharedFunctionInfo>}
Considering 000002D5A0AE69E8 {0x004b3832c931 <SharedFunctionInfo testGetPropOptional>} for inlining with 000002D5A0AE6DF8 {0x004b3832d861 <FeedbackVector[2]>}
Inlining small function(s) at call site #50:JSCall
Inlining 000002D5A0AE69E8 {0x004b3832c931 <SharedFunctionInfo testGetPropOptional>} into 000002D5A0AE4A98 {0x004b3832c779 <SharedFunctionInfo>}
Considering 000002D5A0AE78A8 {0x004b3832c891 <SharedFunctionInfo getPropOptional>} for inlining with 000002D5A0AE78B8 {0x004b3832d7a1 <FeedbackVector[2]>}
Inlining small function(s) at call site #129:JSCall
Inlining 000002D5A0AE78A8 {0x004b3832c891 <SharedFunctionInfo getPropOptional>} into 000002D5A0AE4A98 {0x004b3832c779 <SharedFunctionInfo>}

class Obj { get prop() { return 42; }  }
const obj = new Obj()