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-rw-r--r--backends/firrtl/firrtl.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/backends/firrtl/firrtl.cc b/backends/firrtl/firrtl.cc
index 5be6d60fd..73b1e7d53 100644
--- a/backends/firrtl/firrtl.cc
+++ b/backends/firrtl/firrtl.cc
@@ -363,7 +363,7 @@ struct FirrtlWorker
}
// Check for subfield assignment.
std::string bitsString = "bits(";
- if (sinkExpr.substr(0, bitsString.length()) == bitsString ) {
+ if (sinkExpr.compare(0, bitsString.length(), bitsString) == 0) {
if (sinkSig == nullptr)
log_error("Unknown subfield %s.%s\n", cell_type.c_str(), sinkExpr.c_str());
// Don't generate the assignment here.