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-rw-r--r--lib/Solver/STPBuilder.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Solver/STPBuilder.cpp b/lib/Solver/STPBuilder.cpp
index ebc096df..e4a21f74 100644
--- a/lib/Solver/STPBuilder.cpp
+++ b/lib/Solver/STPBuilder.cpp
@@ -553,7 +553,8 @@ ExprHandle STPBuilder::constructActual(ref<Expr> e, int *width_out) {
 
   case Expr::Read: {
     ReadExpr *re = cast<ReadExpr>(e);
-    *width_out = 8;
+    assert(re && re->updates.root);
+    *width_out = re->updates.root->getRange();
     return vc_readExpr(vc,
                        getArrayForUpdate(re->updates.root, re->updates.head),
                        construct(re->index, 0));