From 6595f8f527f51530821a227d00ec380fb7a9b63d Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Wed, 8 Jan 2020 22:35:28 -0500
Subject: [PATCH] Introduces a timing test for LSL. Which already passes.

---
 .../Mac/Clock SignalTests/68000Tests.mm       | 26 +++++++++++++++++++
 .../Mac/Clock SignalTests/TestRunner68000.hpp |  4 +++
 2 files changed, 30 insertions(+)

diff --git a/OSBindings/Mac/Clock SignalTests/68000Tests.mm b/OSBindings/Mac/Clock SignalTests/68000Tests.mm
index a192a05fe..716b2e880 100644
--- a/OSBindings/Mac/Clock SignalTests/68000Tests.mm	
+++ b/OSBindings/Mac/Clock SignalTests/68000Tests.mm	
@@ -261,6 +261,32 @@ class CPU::MC68000::ProcessorStorageTests {
 	XCTAssertEqual(stack_frame[6], 0x1004);
 }
 
+- (void)testShiftDuration {
+	//
+	_machine->set_program({
+		0x7004,		// MOVE.l #$4, D0
+		0x7207,		// MOVE.l #$7, D1
+		0x7401,		// MOVE.l #$1, D2
+
+		0xe16e,		// lsl d0, d6
+		0xe36e,		// lsl d1, d6
+		0xe56e,		// lsl d2, d6
+	});
+	_machine->run_for_instructions(3);
+
+	_machine->reset_cycle_count();
+	_machine->run_for_instructions(1);
+	XCTAssertEqual(_machine->get_cycle_count(), 6 + 8);
+	_machine->reset_cycle_count();
+
+	_machine->run_for_instructions(1);
+	XCTAssertEqual(_machine->get_cycle_count(), 6 + 14);
+	_machine->reset_cycle_count();
+
+	_machine->run_for_instructions(1);
+	XCTAssertEqual(_machine->get_cycle_count(), 6 + 2);
+}
+
 - (void)testOpcodeCoverage {
 	// Perform an audit of implemented instructions.
 	CPU::MC68000::ProcessorStorageTests storage_tests(
diff --git a/OSBindings/Mac/Clock SignalTests/TestRunner68000.hpp b/OSBindings/Mac/Clock SignalTests/TestRunner68000.hpp
index 0f9d437fb..0a912b3dc 100644
--- a/OSBindings/Mac/Clock SignalTests/TestRunner68000.hpp	
+++ b/OSBindings/Mac/Clock SignalTests/TestRunner68000.hpp	
@@ -130,6 +130,10 @@ class RAM68000: public CPU::MC68000::BusHandler {
 			return int(duration_.as_integral()) >> 1;
 		}
 
+		void reset_cycle_count() {
+			duration_ = HalfCycles(0);
+		}
+
 	private:
 		CPU::MC68000::Processor<RAM68000, true, true> m68000_;
 		std::array<uint16_t, 256*1024> ram_{};