diff --git a/src/Reactor/Optimizer.cpp b/src/Reactor/Optimizer.cpp
index f97b81b..184ac75 100644
--- a/src/Reactor/Optimizer.cpp
+++ b/src/Reactor/Optimizer.cpp
@@ -252,6 +252,14 @@
 					continue;
 				}
 
+				// TODO(b/148272103): InstLoad assumes that a constant ptr is an offset, rather than an
+				// absolute address. We need to make sure we don't replace a variable with a constant
+				// on this load.
+				if(llvm::isa<Ice::Constant>(storeValue))
+				{
+					continue;
+				}
+
 				replace(load, storeValue);
 
 				for(size_t i = 0; i < addressUses.loads.size(); i++)
@@ -415,6 +423,14 @@
 						continue;
 					}
 
+					// TODO(b/148272103): InstLoad assumes that a constant ptr is an offset, rather than an
+					// absolute address. We need to make sure we don't replace a variable with a constant
+					// on this load.
+					if(llvm::isa<Ice::Constant>(storeValue))
+					{
+						continue;
+					}
+
 					replace(inst, storeValue);
 				}
 			}
diff --git a/src/Reactor/SubzeroReactor.cpp b/src/Reactor/SubzeroReactor.cpp
index fbbec49..f2dbdef 100644
--- a/src/Reactor/SubzeroReactor.cpp
+++ b/src/Reactor/SubzeroReactor.cpp
@@ -922,10 +922,10 @@
 		rr::optimize(currFunc);
 
 		currFunc->computeInOutEdges();
-		ASSERT(!currFunc->hasError());
+		ASSERT_MSG(!currFunc->hasError(), "%s", currFunc->getError().c_str());
 
 		currFunc->translate();
-		ASSERT(!currFunc->hasError());
+		ASSERT_MSG(!currFunc->hasError(), "%s", currFunc->getError().c_str());
 
 		currFunc->getAssembler<>()->setInternal(currFunc->getInternal());