From 0b199f33728cb8e3949f5af84a6a5f3225a8a9a8 Mon Sep 17 00:00:00 2001
From: Daniel Kirchner <daniel@ekpyron.org>
Date: Tue, 6 Oct 2020 13:02:51 +0200
Subject: [PATCH] Exit StackToMemoryMover early, if there are no variables to
 be moved.

---
 libyul/optimiser/StackToMemoryMover.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libyul/optimiser/StackToMemoryMover.cpp b/libyul/optimiser/StackToMemoryMover.cpp
index d7c93e8b4..06e25b4a2 100644
--- a/libyul/optimiser/StackToMemoryMover.cpp
+++ b/libyul/optimiser/StackToMemoryMover.cpp
@@ -63,6 +63,12 @@ void StackToMemoryMover::run(
 	Block& _block
 )
 {
+	if (!_numRequiredSlots)
+	{
+		yulAssert(_memorySlots.empty(), "");
+		return;
+	}
+
 	auto const* evmDialect = dynamic_cast<EVMDialect const*>(&_context.dialect);
 	yulAssert(
 		evmDialect && evmDialect->providesObjectAccess(),