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-rw-r--r--ice40/cells.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/ice40/cells.cc b/ice40/cells.cc
index b11a2a77..fb264051 100644
--- a/ice40/cells.cc
+++ b/ice40/cells.cc
@@ -147,7 +147,8 @@ void dff_to_lc(CellInfo *dff, CellInfo *lc, bool pass_thru_lut)
if (citer != config.end()) {
if ((config.end() - citer) >= 2) {
- assert(*(citer++) == 'S');
+ char c = *(citer++);
+ assert(c == 'S');
lc->params["ASYNC_SR"] = "0";
} else {
lc->params["ASYNC_SR"] = "1";