nickdesaulniers created this revision. Herald added a project: All. nickdesaulniers requested review of this revision. Herald added a project: clang. Herald added a subscriber: cfe-commits.
Consider the following statement: int x = ~0; With the following AST: `-VarDecl 0x5647bdb12d60 <x.c:1:1, col:10> col:5 x 'int' cinit `-UnaryOperator 0x5647bdb12e30 <col:9, col:10> 'int' prefix '~' cannot overflow `-IntegerLiteral 0x5647bdb12e10 <col:10> 'int' 0 Return the evaluation of the subexpression bitwise inverted. Link: https://github.com/ClangBuiltLinux/linux/issues/1906 Repository: rG LLVM Github Monorepo https://reviews.llvm.org/D157432 Files: clang/lib/CodeGen/CGExprConstant.cpp Index: clang/lib/CodeGen/CGExprConstant.cpp =================================================================== --- clang/lib/CodeGen/CGExprConstant.cpp +++ clang/lib/CodeGen/CGExprConstant.cpp @@ -1394,6 +1394,13 @@ return nullptr; } + llvm::Constant *VisitUnaryNot(UnaryOperator *U, QualType T) { + if (llvm::Constant *C = Visit(U->getSubExpr(), T)) + if (auto *CI = dyn_cast<llvm::ConstantInt>(C)) + return llvm::ConstantInt::get(CGM.getLLVMContext(), ~CI->getValue()); + return nullptr; + } + // Utility methods llvm::Type *ConvertType(QualType T) { return CGM.getTypes().ConvertType(T);
Index: clang/lib/CodeGen/CGExprConstant.cpp =================================================================== --- clang/lib/CodeGen/CGExprConstant.cpp +++ clang/lib/CodeGen/CGExprConstant.cpp @@ -1394,6 +1394,13 @@ return nullptr; } + llvm::Constant *VisitUnaryNot(UnaryOperator *U, QualType T) { + if (llvm::Constant *C = Visit(U->getSubExpr(), T)) + if (auto *CI = dyn_cast<llvm::ConstantInt>(C)) + return llvm::ConstantInt::get(CGM.getLLVMContext(), ~CI->getValue()); + return nullptr; + } + // Utility methods llvm::Type *ConvertType(QualType T) { return CGM.getTypes().ConvertType(T);
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