v8/test/mjsunit/compiler/property-stores.js

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// Flags: --allow-natives-syntax

var a = 42;

var obj = {x: 0,
           f: function() { this.x = 7; },
           g: function() { this.x = a | 1; },
           h: function() { this.x = a; }};

var i;
%PrepareFunctionForOptimization(obj.f);
for (i = 0; i < 5; i++) { obj.f(); }
%OptimizeFunctionOnNextCall(obj.f);
obj.f();
assertEquals(7, obj.x);

%PrepareFunctionForOptimization(obj.g);
for (i = 0; i < 5; i++) { obj.g(); }
%OptimizeFunctionOnNextCall(obj.g);
obj.g();
assertEquals(43, obj.x);

%PrepareFunctionForOptimization(obj.h);
for (i = 0; i < 5; i++) { obj.h(); }
%OptimizeFunctionOnNextCall(obj.h);
obj.h();
assertEquals(42, obj.x);