First Commit

common/emitter/implement/group2.h

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+// SPDX-FileCopyrightText: 2002-2025 PCSX2 Dev Team
+// SPDX-License-Identifier: GPL-3.0+
+
+#pragma once
+
+namespace x86Emitter
+{
+
+	enum G2Type
+	{
+		G2Type_ROL = 0,
+		G2Type_ROR,
+		G2Type_RCL,
+		G2Type_RCR,
+		G2Type_SHL,
+		G2Type_SHR,
+		G2Type_Unused,
+		G2Type_SAR
+	};
+
+	// --------------------------------------------------------------------------------------
+	//  xImpl_Group2
+	// --------------------------------------------------------------------------------------
+	// Group 2 (shift) instructions have no Sib/ModRM forms.
+	// Optimization Note: For Imm forms, we ignore the instruction if the shift count is zero.
+	// This is a safe optimization since any zero-value shift does not affect any flags.
+	//
+	struct xImpl_Group2
+	{
+		G2Type InstType;
+
+		void operator()(const xRegisterInt& to, const xRegisterCL& from) const;
+		void operator()(const xIndirect64orLess& to, const xRegisterCL& from) const;
+		void operator()(const xRegisterInt& to, u8 imm) const;
+		void operator()(const xIndirect64orLess& to, u8 imm) const;
+
+#if 0
+	// ------------------------------------------------------------------------
+	template< typename T > __noinline void operator()( const xDirectOrIndirect<T>& to, u8 imm ) const
+	{
+		_DoI_helpermess( *this, to, imm );
+	}
+
+	template< typename T > __noinline void operator()( const xDirectOrIndirect<T>& to, const xRegisterCL& from ) const
+	{
+		_DoI_helpermess( *this, to, from );
+	}
+#endif
+	};
+
+} // End namespace x86Emitter