diff options
Diffstat (limited to 'clang/lib/Sema/SemaChecking.cpp')
| -rw-r--r-- | clang/lib/Sema/SemaChecking.cpp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp index a258d349c68..d6183dde95f 100644 --- a/clang/lib/Sema/SemaChecking.cpp +++ b/clang/lib/Sema/SemaChecking.cpp @@ -10896,6 +10896,19 @@ CheckImplicitConversion(Sema &S, Expr *E, QualType T, SourceLocation CC, return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_precision); } + if (TargetRange.Width > SourceRange.Width) { + if (auto *UO = dyn_cast<UnaryOperator>(E)) + if (UO->getOpcode() == UO_Minus) + if (Source->isUnsignedIntegerType()) { + if (Target->isUnsignedIntegerType()) + return DiagnoseImpCast(S, E, T, CC, + diag::warn_impcast_high_order_zero_bits); + if (Target->isSignedIntegerType()) + return DiagnoseImpCast(S, E, T, CC, + diag::warn_impcast_nonnegative_result); + } + } + if (TargetRange.Width == SourceRange.Width && !TargetRange.NonNegative && SourceRange.NonNegative && Source->isSignedIntegerType()) { // Warn when doing a signed to signed conversion, warn if the positive |