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LibJS: Add extreme value tests for cos and sin

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These sometimes produce different NaN patterns which can mess up the
value encoding.
This commit is contained in:
davidot 2022-08-10 11:57:46 +02:00 • committed by Andreas Kling
parent 27abbfdf09
commit da8715a07c
4 changed files with 35 additions and 3 deletions
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32
Userland/Libraries/LibJS/Runtime/MathObject.cpp
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@ -183,27 +183,53 @@ JS_DEFINE_NATIVE_FUNCTION(MathObject::trunc)
// 21.3.2.30 Math.sin ( x ), https://tc39.es/ecma262/#sec-math.sin
JS_DEFINE_NATIVE_FUNCTION(MathObject::sin)
{
// 1. Let n be ? ToNumber(x).
auto number = TRY(vm.argument(0).to_number(global_object));
if (number.is_nan())
// 2. If n is NaN, n is +0𝔽, or n is -0𝔽, return n.
if (number.is_nan() || number.is_positive_zero() || number.is_negative_zero())
return number;
// 3. If n is +∞𝔽 or n is -∞𝔽, return NaN.
if (number.is_infinity())
return js_nan();
// 4. Return an implementation-approximated Number value representing the result of the sine of ℝ(n).
return Value(::sin(number.as_double()));
}
// 21.3.2.12 Math.cos ( x ), https://tc39.es/ecma262/#sec-math.cos
JS_DEFINE_NATIVE_FUNCTION(MathObject::cos)
{
// 1. Let n be ? ToNumber(x).
auto number = TRY(vm.argument(0).to_number(global_object));
if (number.is_nan())
// 2. If n is NaN, n is +∞𝔽, or n is -∞𝔽, return NaN.
if (number.is_nan() || number.is_infinity())
return js_nan();
// 3. If n is +0𝔽 or n is -0𝔽, return 1𝔽.
if (number.is_positive_zero() || number.is_negative_zero())
return Value(1);
// 4. Return an implementation-approximated Number value representing the result of the cosine of ℝ(n).
return Value(::cos(number.as_double()));
}
// 21.3.2.33 Math.tan ( x ), https://tc39.es/ecma262/#sec-math.tan
JS_DEFINE_NATIVE_FUNCTION(MathObject::tan)
{
// Let n be ? ToNumber(x).
auto number = TRY(vm.argument(0).to_number(global_object));
if (number.is_nan())
// 2. If n is NaN, n is +0𝔽, or n is -0𝔽, return n.
if (number.is_nan() || number.is_positive_zero() || number.is_negative_zero())
return number;
// 3. If n is +∞𝔽, or n is -∞𝔽, return NaN.
if (number.is_infinity())
return js_nan();
// 4. Return an implementation-approximated Number value representing the result of the tangent of ℝ(n).
return Value(::tan(number.as_double()));
}