Assert in isl expression builder if id can not be found [NFC]

llvm-svn: 231865

diff --git a/polly/lib/CodeGen/IslExprBuilder.cpp b/polly/lib/CodeGen/IslExprBuilder.cpp
index c749b2d..089cac0 100644 (file)
--- a/polly/lib/CodeGen/IslExprBuilder.cpp
+++ b/polly/lib/CodeGen/IslExprBuilder.cpp
@@ -587,6 +587,8 @@ Value *IslExprBuilder::createId(__isl_take isl_ast_expr *Expr) {
 
   V = IDToValue[Id];
 
+  assert(V && "Unknown parameter id found");
+
   isl_id_free(Id);
   isl_ast_expr_free(Expr);