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-rw-r--r--lib/Sema/SemaExpr.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index 57159fb59715..adcc38cbc4fd 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -8567,7 +8567,7 @@ static void DiagnoseBadShiftValues(Sema& S, ExprResult &LHS, ExprResult &RHS,
// If LHS does not have a signed type and non-negative value
// then, the behavior is undefined. Warn about it.
- if (Left.isNegative()) {
+ if (Left.isNegative() && !S.getLangOpts().isSignedOverflowDefined()) {
S.DiagRuntimeBehavior(Loc, LHS.get(),
S.PDiag(diag::warn_shift_lhs_negative)
<< LHS.get()->getSourceRange());