v8/test/mjsunit/lithium/MathExp.js

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// Flags: --allow-natives-syntax

function foo(x) {
  return Math.exp(x);
}

%PrepareFunctionForOptimization(foo);
foo(12.3);
var r1 = foo(12.3);
%OptimizeFunctionOnNextCall(foo);
var r2 = foo(12.3);

assertEquals(r1, r2);