v8/test/mjsunit/never-optimize.js

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// Flags: --allow-natives-syntax --opt --no-always-opt

function o1() {
}
%PrepareFunctionForOptimization(o1);

o1(); o1();
%OptimizeFunctionOnNextCall(o1);
o1();

// Check that the given function was optimized.
assertOptimized(o1);

// Test the %NeverOptimizeFunction runtime call.
%NeverOptimizeFunction(u1);
function u1() {
}

function u2() {
  u1();
}
%PrepareFunctionForOptimization(u1);
%PrepareFunctionForOptimization(u2);

u1(); u1();
u2(); u2();

%OptimizeFunctionOnNextCall(u1);
%OptimizeFunctionOnNextCall(u2);

u1(); u1();
u2(); u2();

assertUnoptimized(u1);
assertOptimized(u2);