test/mjsunit/compiler/property-stores.js

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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;
for (i = 0; i < 10000; i++) { obj.f(); }
assertEquals(7, obj.x);

for (i = 0; i < 10000; i++) { obj.g(); }
assertEquals(43, obj.x);

for (i = 0; i < 10000; i++) { obj.h(); }
assertEquals(42, obj.x);