ir/value: Add member function to check whether or not all bits of a contained value are set
This is useful when we wish to know if a contained value is something like 0xFFFFFFFF, as this helps perform constant folding. For example the operation: x & 0xFFFFFFFF can be folded to just x in the 32-bit case.
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@ -174,4 +174,24 @@ u64 Value::GetImmediateAsU64() const {
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}
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}
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bool Value::HasAllBitsSet() const {
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ASSERT(IsImmediate());
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switch (GetType()) {
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case IR::Type::U1:
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return GetU1();
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case IR::Type::U8:
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return GetU8() == 0xFF;
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case IR::Type::U16:
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return GetU16() == 0xFFFF;
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case IR::Type::U32:
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return GetU32() == 0xFFFFFFFF;
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case IR::Type::U64:
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return GetU64() == 0xFFFFFFFFFFFFFFFF;
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default:
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ASSERT_MSG(false, "HasAllBitsSet called on an incompatible Value type.");
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return false;
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}
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}
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} // namespace Dynarmic::IR
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@ -74,6 +74,14 @@ public:
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*/
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u64 GetImmediateAsU64() const;
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/**
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* Determines whether or not the contained constant value has all bits set.
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*
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* @pre The value contains either a U1, U8, U16, U32, or U64 value.
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* Breaking this precondition will cause an assertion to be invoked.
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*/
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bool HasAllBitsSet() const;
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private:
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Type type;
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