Add an inline helper function that masks a GenericValue to a specified
bit width.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33325 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ExecutionEngine/Interpreter/Interpreter.h b/lib/ExecutionEngine/Interpreter/Interpreter.h
index c62249b..3007b0a 100644
--- a/lib/ExecutionEngine/Interpreter/Interpreter.h
+++ b/lib/ExecutionEngine/Interpreter/Interpreter.h
@@ -231,8 +231,20 @@
GenericValue executeCastOperation(Instruction::CastOps opcode, Value *SrcVal,
const Type *Ty, ExecutionContext &SF);
void popStackAndReturnValueToCaller(const Type *RetTy, GenericValue Result);
+
};
+inline void maskToBitWidth(GenericValue& GV, unsigned BitWidth) {
+ uint64_t BitMask = (1ull << BitWidth) - 1;
+ if (BitWidth <= 8)
+ GV.Int8Val &= BitMask;
+ else if (BitWidth <= 16)
+ GV.Int16Val &= BitMask;
+ else if (BitWidth <= 32)
+ GV.Int32Val &= BitMask;
+ else
+ GV.Int64Val &= BitMask;
+}
} // End llvm namespace
#endif