From 4279ce87ea41dedfe7af5e332b81e4313a8a8fbf Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Sun, 22 May 2022 08:29:12 -0400
Subject: [PATCH] Implement LEA.

---
 .../Implementation/68000Mk2Implementation.hpp     | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Processors/68000Mk2/Implementation/68000Mk2Implementation.hpp b/Processors/68000Mk2/Implementation/68000Mk2Implementation.hpp
index 38f0372ac..58c2eee4f 100644
--- a/Processors/68000Mk2/Implementation/68000Mk2Implementation.hpp
+++ b/Processors/68000Mk2/Implementation/68000Mk2Implementation.hpp
@@ -163,6 +163,7 @@ enum ExecutionState: int {
 
 	DIVU_DIVS,
 	MULU_MULS,
+	LEA,
 };
 
 // MARK: - The state machine.
@@ -701,6 +702,12 @@ void Processor<BusHandler, dtack_is_implicit, permit_overrun, signal_will_perfor
 				StdCASE(MULU,		perform_state_ = MULU_MULS);
 				StdCASE(MULS,		perform_state_ = MULU_MULS);
 
+				StdCASE(LEA, {
+					post_ea_state_ = LEA;
+					next_operand_ = 0;
+					MoveToStateSpecific(CalcEffectiveAddress);
+				});
+
 				default:
 					assert(false);
 			}
@@ -1875,6 +1882,14 @@ void Processor<BusHandler, dtack_is_implicit, permit_overrun, signal_will_perfor
 
 		MoveToStateSpecific(Decode);
 
+		//
+		// LEA
+		//
+		BeginState(LEA):
+			registers_[8 + instruction_.reg(1)].l = effective_address_[0];
+			Prefetch();
+		MoveToStateSpecific(Decode);
+
 		//
 		// Various states TODO.
 		//