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-rw-r--r--passes/techmap/dfflibmap.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/passes/techmap/dfflibmap.cc b/passes/techmap/dfflibmap.cc
index 23d93353..fd5fa86e 100644
--- a/passes/techmap/dfflibmap.cc
+++ b/passes/techmap/dfflibmap.cc
@@ -342,7 +342,7 @@ static bool expand_cellmap(std::string pattern, std::string inv)
static void map_sr_to_arst(const char *from, const char *to)
{
- if (cell_mappings.count(to) > 0)
+ if (!cell_mappings.count(from) || cell_mappings.count(to) > 0)
return;
char from_clk_pol = from[8], from_set_pol = from[9], from_clr_pol = from[10];