v8/test/mjsunit/compiler/inline-arity-mismatch.js

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// Flags: --allow-natives-syntax

// Test inlining at call sites with mismatched arity.

function f(a) {
  return a.x;
}

function g(a, b) {
  return a.x;
}

function h1(a, b) {
  return f(a, a) * g(b);
}

function h2(a, b) {
  return f(a, a) * g(b);
}


var o = {x: 2};

%PrepareFunctionForOptimization(h1);
assertEquals(4, h1(o, o));
assertEquals(4, h1(o, o));
%OptimizeFunctionOnNextCall(h1);
assertEquals(4, h1(o, o));

%PrepareFunctionForOptimization(h2);
assertEquals(4, h2(o, o));
assertEquals(4, h2(o, o));
%OptimizeFunctionOnNextCall(h2);
assertEquals(4, h2(o, o));

var u = {y:0, x:1};
assertEquals(2, h1(u, o));
assertEquals(2, h2(o, u));