[clang] 30ce1e9 - [CGExprScalar] Allow implicit truncation for CharacterLiteral

[Nikita Popov via cfe-commits]

Author: Nikita Popov
Date: 2025-12-17T12:48:50+01:00
New Revision: 30ce1e9c7a507f188b34948daef6e2aa799f6e5c

URL: https://github.com/llvm/llvm-project/commit/30ce1e9c7a507f188b34948daef6e2aa799f6e5c
DIFF: https://github.com/llvm/llvm-project/commit/30ce1e9c7a507f188b34948daef6e2aa799f6e5c.diff

LOG: [CGExprScalar] Allow implicit truncation for CharacterLiteral

The value is always stored as an unsigned number, even if the
char type is signed, so we have to allow truncation here.

Added: 
    

Modified: 
    clang/lib/CodeGen/CGExprScalar.cpp

Removed: 
    


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diff  --git a/clang/lib/CodeGen/CGExprScalar.cpp b/clang/lib/CodeGen/CGExprScalar.cpp
index 96274cf7f8220..b4daaef95bb8d 100644
--- a/clang/lib/CodeGen/CGExprScalar.cpp
+++ b/clang/lib/CodeGen/CGExprScalar.cpp
@@ -510,7 +510,10 @@ class ScalarExprEmitter
     return llvm::ConstantFP::get(VMContext, E->getValue());
   }
   Value *VisitCharacterLiteral(const CharacterLiteral *E) {
-    return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
+    // Character literals are always stored in an unsigned (even for signed
+    // char), so allow implicit truncation here.
+    return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue(),
+                                  /*IsSigned=*/false, /*ImplicitTrunc=*/true);
   }
   Value *VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) {
     return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());