PPCRec: Make register pool for RA configurable

src/Cafe/HW/Espresso/Recompiler/IML/IMLRegisterAllocator.h

@@ -0,0 +1,94 @@
+
+// container for storing a set of register indices
+// specifically optimized towards storing physical register indices (expected to be below 64)
+class IMLPhysRegisterSet
+{
+public:
+	void SetAvailable(uint32 index)
+	{
+		cemu_assert_debug(index < 64);
+		m_regBitmask |= ((uint64)1 << index);
+	}
+
+	void SetReserved(uint32 index)
+	{
+		cemu_assert_debug(index < 64);
+		m_regBitmask &= ~((uint64)1 << index);
+	}
+
+	bool IsAvailable(uint32 index) const
+	{
+		return (m_regBitmask & (1 << index)) != 0;
+	}
+
+	IMLPhysRegisterSet& operator&=(const IMLPhysRegisterSet& other)
+	{
+		this->m_regBitmask &= other.m_regBitmask;
+		return *this;
+	}
+
+	IMLPhysRegisterSet& operator=(const IMLPhysRegisterSet& other)
+	{
+		this->m_regBitmask = other.m_regBitmask;
+		return *this;
+	}
+
+	bool HasAnyAvailable() const
+	{
+		return m_regBitmask != 0;
+	}
+
+	// returns index of first available register. Do not call when HasAnyAvailable() == false
+	uint32 GetFirstAvailableReg()
+	{
+		cemu_assert_debug(m_regBitmask != 0);
+		uint32 regIndex = 0;
+		auto tmp = m_regBitmask;
+		while ((tmp & 0xFF) == 0)
+		{
+			regIndex += 8;
+			tmp >>= 8;
+		}
+		while ((tmp & 0x1) == 0)
+		{
+			regIndex++;
+			tmp >>= 1;
+		}
+		return regIndex;
+	}
+
+	// returns index of next available register (search includes any register index >= startIndex)
+	// returns -1 if there is no more register
+	sint32 GetNextAvailableReg(sint32 startIndex)
+	{
+		if (startIndex >= 64)
+			return -1;
+		uint32 regIndex = startIndex;
+		auto tmp = m_regBitmask;
+		tmp >>= regIndex;
+		if (!tmp)
+			return -1;
+		while ((tmp & 0xFF) == 0)
+		{
+			regIndex += 8;
+			tmp >>= 8;
+		}
+		while ((tmp & 0x1) == 0)
+		{
+			regIndex++;
+			tmp >>= 1;
+		}
+		return regIndex;
+	}
+
+private:
+	uint64 m_regBitmask{ 0 };
+};
+
+
+struct IMLRegisterAllocatorParameters
+{
+	IMLPhysRegisterSet physicalRegisterPool;
+};
+
+void IMLRegisterAllocator_AllocateRegisters(ppcImlGenContext_t* ppcImlGenContext, IMLRegisterAllocatorParameters& raParam);