1 files changed, 6 insertions, 0 deletions
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index a534ead..c716394 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -7827,6 +7827,12 @@ bool AnalyzeBitFieldAssignment(Sema &S, FieldDecl *Bitfield, Expr *Init,
   unsigned OriginalWidth = Value.getBitWidth();
   unsigned FieldWidth = Bitfield->getBitWidthValue(S.Context);
 
+  if (Value.isSigned() && Value.isNegative())
+    if (UnaryOperator *UO = dyn_cast<UnaryOperator>(OriginalInit))
+      if (UO->getOpcode() == UO_Minus)
+        if (isa<IntegerLiteral>(UO->getSubExpr()))
+          OriginalWidth = Value.getMinSignedBits();
+
   if (OriginalWidth <= FieldWidth)
     return false;