v8/test/mjsunit/smi-mul.js

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// Flags: --allow-natives-syntax --opt --noalways-opt

function mul(a, b) {
    return a * b;
}


%PrepareFunctionForOptimization(mul);
mul(-1, 2);
mul(-1, 2);
%OptimizeFunctionOnNextCall(mul);
assertEquals(-2, mul(-1, 2));
assertOptimized(mul);

// Deopt on minus zero.
assertEquals(-0, mul(-1, 0));
assertUnoptimized(mul);


function mul2(a, b) {
    return a * b;
}

%PrepareFunctionForOptimization(mul2);
mul2(-1, 2);
mul2(-1, 2);
%OptimizeFunctionOnNextCall(mul2);

// -2^30 is in Smi range on most configurations, +2^30 is not.
var two_30 = 1 << 30;
assertEquals(two_30, mul2(-two_30, -1));

// For good measure, check that overflowing int32 range (or Smi range
// without pointer compression) works too.
var two_31 = two_30 * 2;
assertEquals(two_31, mul2(-two_31, -1));

// One of the two situations deoptimized the code.
assertUnoptimized(mul2);