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AK+LibJS: Make Number.MIN_VALUE a denormal

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ECMA-262 implies that `MIN_VALUE` should be a denormalized value if
denormal arithmetic is supported. This is the case on x86-64 and AArch64
using standard GCC/Clang compilation settings.

test262 checks whether `Number.MIN_VALUE / 2.0` is equal to 0, which
only holds if `MIN_VALUE` is the smallest denormalized value.

This commit renames the existing `NumericLimits<FloatingPoint>::min()`
to `min_normal()` and adds a `min_denormal()` method to force users to
explicitly think about which one is appropriate for their use case. We
shouldn't follow the STL's confusingly designed interface in this
regard.
This commit is contained in:
Daniel Bertalan 2023-07-02 18:28:26 +02:00 • committed by Linus Groh
commit 0cd85ab0fc
Notes: sideshowbarker 2024-07-17 10:05:47 +09:00
3 changed files with 9 additions and 4 deletions
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2
Userland/Libraries/LibJS/Runtime/NumberConstructor.cpp
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@ -46,7 +46,7 @@ ThrowCompletionOr<void> NumberConstructor::initialize(Realm& realm)
define_direct_property(vm.names.parseFloat, realm.intrinsics().parse_float_function(), attr);
define_direct_property(vm.names.EPSILON, Value(EPSILON_VALUE), 0);
define_direct_property(vm.names.MAX_VALUE, Value(NumericLimits<double>::max()), 0);
define_direct_property(vm.names.MIN_VALUE, Value(NumericLimits<double>::min()), 0);
define_direct_property(vm.names.MIN_VALUE, Value(NumericLimits<double>::min_denormal()), 0);
define_direct_property(vm.names.MAX_SAFE_INTEGER, Value(MAX_SAFE_INTEGER_VALUE), 0);
define_direct_property(vm.names.MIN_SAFE_INTEGER, Value(MIN_SAFE_INTEGER_VALUE), 0);
define_direct_property(vm.names.NEGATIVE_INFINITY, js_negative_infinity(), 0);