v8/test/mjsunit/compiler/count-deopt.js

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// Test deopt with count operation on parameter.
var max_smi = 1073741823;
var o = {x:0};

function inc1(x) { x++; o.x = x; }
inc1(max_smi);
assertEquals(max_smi + 1, o.x);

inc1(1.1);
assertEquals(2.1, o.x);


// Test deopt with count operation on named property.
function inc2(p) { p.x++ }

o.x = "42";
inc2(o);
assertEquals(43, o.x);

var s = max_smi - 10000;
o.x = s;
for(var i = 0; i < 20000; i++) {
  inc2(o);
}
assertEquals(max_smi + 10000, o.x);


// Test deopt with count operation on keyed property.
function inc3(a, b) { a[b]++; }

o = ["42"];
inc3(o, 0);
assertEquals(43, o[0]);

var s = max_smi - 10000;
o[0] = s;
for(var i = 0; i < 20000; i++) {
  inc3(o, 0);
}
assertEquals(max_smi + 10000, o[0]);

inc3(o,"0");

assertEquals(max_smi + 10001, o[0]);

// Test bailout when accessing a non-existing array element.
o[0] = 0;
for(var i = 0; i < 10000; i++) {
  inc3(o, 0);
}
inc3(o,1);

// Test bailout with count operation in a value context.
function inc4(x,y) { return (x++) + y; }
for (var i = 0; i < 100000; ++i) assertEquals(3, inc4(2, 1));
assertEquals(3.1, inc4(2, 1.1));

function inc5(x,y) { return (++x) + y; }
for (var i = 0; i < 100000; ++i) assertEquals(4, inc5(2, 1));
assertEquals(4.1, inc5(2, 1.1));
assertEquals(4.1, inc5(2.1, 1));

function inc6(o,y) { return (o.x++) + y; }
o = {x:0};
for (var i = 0; i < 10000; ++i) {
  o.x = 42;
  assertEquals(43, inc6(o, 1));
}
o.x = 42;
assertEquals(43.1, inc6(o, 1.1));
o.x = 42.1;
assertEquals(43.1, inc6(o, 1));

function inc7(o,y) { return (++o.x) + y; }
o = {x:0};
for (var i = 0; i < 10000; ++i) {
  o.x = 42;
  assertEquals(44, inc7(o, 1));
}
o.x = 42;
assertEquals(44.1, inc7(o, 1.1));
o.x = 42.1;
assertEquals(44.1, inc7(o, 1));

function inc8(o,y) { return (o[0]++) + y; }
var q = [0];
for (var i = 0; i < 100000; ++i) {
  q[0] = 42;
  assertEquals(43, inc8(q, 1));
}
q[0] = 42;
assertEquals(43.1, inc8(q, 1.1));
q[0] = 42.1;
assertEquals(43.1, inc8(q, 1));

function inc9(o,y) { return (++o[0]) + y; }
q = [0];
for (var i = 0; i < 100000; ++i) {
  q[0] = 42;
  assertEquals(44, inc9(q, 1));
}
q[0] = 42;
assertEquals(44.1, inc9(q, 1.1));
q[0] = 42.1;
assertEquals(44.1, inc9(q, 1));

// Test deopt because of a failed map check.
function inc10(p) { return p.x++ }
var g1 = {x:0};
var g2 = {y:0, x:42}
for (var i = 0; i < 10000; ++i) {
  g1.x = 42;
  assertEquals(42, inc10(g1));
  assertEquals(43, g1.x);
}
assertEquals(42, inc10(g2));
assertEquals(43, g2.x);

// Test deoptimization with postfix operation in a value context.
function inc11(a) { return a[this.x++]; }
var g3 = {x:null, f:inc11};
var g4 = [42];
assertEquals(42, g3.f(g4));