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LibJS: Unify exponentiation logic for ** operator and Math.pow
The JS behaviour of exponentiation on two number typed values is not a simple matter of forwarding to ::pow(double, double). So, this factors out the Math.pow logic to allow it to be shared with Value::exp.
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3 changed files with 70 additions and 48 deletions
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@ -216,53 +216,7 @@ JS_DEFINE_NATIVE_FUNCTION(MathObject::pow)
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{
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auto base = TRY(vm.argument(0).to_number(global_object));
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auto exponent = TRY(vm.argument(1).to_number(global_object));
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if (exponent.is_nan())
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return js_nan();
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if (exponent.is_positive_zero() || exponent.is_negative_zero())
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return Value(1);
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if (base.is_nan())
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return js_nan();
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if (base.is_positive_infinity())
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return exponent.as_double() > 0 ? js_infinity() : Value(0);
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if (base.is_negative_infinity()) {
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auto is_odd_integral_number = exponent.is_integral_number() && (exponent.as_i32() % 2 != 0);
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if (exponent.as_double() > 0)
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return is_odd_integral_number ? js_negative_infinity() : js_infinity();
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else
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return is_odd_integral_number ? Value(-0.0) : Value(0);
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}
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if (base.is_positive_zero())
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return exponent.as_double() > 0 ? Value(0) : js_infinity();
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if (base.is_negative_zero()) {
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auto is_odd_integral_number = exponent.is_integral_number() && (exponent.as_i32() % 2 != 0);
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if (exponent.as_double() > 0)
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return is_odd_integral_number ? Value(-0.0) : Value(0);
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else
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return is_odd_integral_number ? js_negative_infinity() : js_infinity();
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}
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VERIFY(base.is_finite_number() && !base.is_positive_zero() && !base.is_negative_zero());
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if (exponent.is_positive_infinity()) {
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auto absolute_base = fabs(base.as_double());
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if (absolute_base > 1)
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return js_infinity();
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else if (absolute_base == 1)
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return js_nan();
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else if (absolute_base < 1)
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return Value(0);
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}
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if (exponent.is_negative_infinity()) {
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auto absolute_base = fabs(base.as_double());
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if (absolute_base > 1)
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return Value(0);
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else if (absolute_base == 1)
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return js_nan();
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else if (absolute_base < 1)
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return js_infinity();
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}
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VERIFY(exponent.is_finite_number() && !exponent.is_positive_zero() && !exponent.is_negative_zero());
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if (base.as_double() < 0 && !exponent.is_integral_number())
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return js_nan();
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return Value(::pow(base.as_double(), exponent.as_double()));
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return JS::exp(global_object, base, exponent);
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}
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// 21.3.2.14 Math.exp ( x ), https://tc39.es/ecma262/#sec-math.exp
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