================
@@ -194,6 +226,8 @@ static void locateCStrings(SparseBitVector<8> &BV, 
StringRef Str) {
       SpecPos += 2;
       continue;
     }
+    if (Str.find_first_of("v", SpecPos) != StringRef::npos)
----------------
ssahasra wrote:

I don't think this will work as expected. It can clearly match a "v" that 
occurs after the data type. For example, it is supposed to match "%v2d", but it 
will also match "%d v". The match should be performed inside the "Spec" 
substring created below. 

https://github.com/llvm/llvm-project/pull/72556
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