Opt

diff --git a/passes/techmap/shregmap.cc b/passes/techmap/shregmap.cc
index 028f4ba3560d3b0437fbcef770e00e0a26f554cf..d5221d46f894a68adf34d7bc27ffc7e6baa2dd89 100644 (file)
--- a/passes/techmap/shregmap.cc
+++ b/passes/techmap/shregmap.cc
@@ -102,7 +102,7 @@ struct ShregmapTechXilinx7 : ShregmapTech
 
        virtual void init(const Module* module, const SigMap &sigmap) override
        {
-               for (auto i : module->cells_) {
+               for (const auto &i : module->cells_) {
                        auto cell = i.second;
                        if (cell->type != "$shiftx") continue;
                        if (cell->getParam("\\Y_WIDTH") != 1) continue;