test/mjsunit/compiler/alloc-number.js

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// Try to get a GC because of a heap number allocation while we
// have live values (o) in a register.
function f(o) {
  var x = 1.5;
  var y = 2.5;
  for (var i = 1; i < 100000; i+=2) o.val = x + y + i;
  return o;
}

var o = { val: 0 };
for (var i = 0; i < 100; i++) f(o);