From 0cbb481fa41c47f1bec95fe96fb734ec11e38ae1 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Tue, 8 Mar 2022 14:56:27 -0500
Subject: [PATCH] Add a formal SIB test.

---
 OSBindings/Mac/Clock SignalTests/x86DecoderTests.mm | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/OSBindings/Mac/Clock SignalTests/x86DecoderTests.mm b/OSBindings/Mac/Clock SignalTests/x86DecoderTests.mm
index 206070194..4cc5bdbbe 100644
--- a/OSBindings/Mac/Clock SignalTests/x86DecoderTests.mm	
+++ b/OSBindings/Mac/Clock SignalTests/x86DecoderTests.mm	
@@ -330,4 +330,16 @@ std::vector<typename InstructionSet::x86::Decoder<model>::InstructionT> decode(c
 	run_test(true, DataSize::DWord);
 }
 
+- (void)testSIB {
+	const auto instructions = decode<Model::i80386>({
+		// add edx, -0x7d(ebp + eax*2)
+		0x01, 0x54, 0x45, 0x83
+	}, true);
+
+	XCTAssertEqual(instructions.size(), 1);
+	test(instructions[0], DataSize::DWord, Operation::ADD, Source::eDX, ScaleIndexBase(1, Source::eAX, Source::eBP), 0x00, -125);
+	// Noting that a multiplier of 2 is a scale of 1,
+	// since the scale is in log2.
+}
+
 @end