First Commit

common/emitter/implement/dwshift.h

@@ -0,0 +1,32 @@
+// SPDX-FileCopyrightText: 2002-2025 PCSX2 Dev Team
+// SPDX-License-Identifier: GPL-3.0+
+
+#pragma once
+
+namespace x86Emitter
+{
+
+	// Implementations here cover SHLD and SHRD.
+
+	// --------------------------------------------------------------------------------------
+	//  xImpl_DowrdShift
+	// --------------------------------------------------------------------------------------
+	// I use explicit method declarations here instead of templates, in order to provide
+	// *only* 32 and 16 bit register operand forms (8 bit registers are not valid in SHLD/SHRD).
+	//
+	// Optimization Note: Imm shifts by 0 are ignore (no code generated).  This is a safe optimization
+	// because shifts by 0 do *not* affect flags status (intel docs cited).
+	//
+	struct xImpl_DwordShift
+	{
+		u16 OpcodeBase;
+
+		void operator()(const xRegister16or32or64& to, const xRegister16or32or64& from, const xRegisterCL& clreg) const;
+
+		void operator()(const xRegister16or32or64& to, const xRegister16or32or64& from, u8 shiftcnt) const;
+
+		void operator()(const xIndirectVoid& dest, const xRegister16or32or64& from, const xRegisterCL& clreg) const;
+		void operator()(const xIndirectVoid& dest, const xRegister16or32or64& from, u8 shiftcnt) const;
+	};
+
+} // End namespace x86Emitter