Index: lldb/trunk/source/Core/DataExtractor.cpp
===================================================================
--- lldb/trunk/source/Core/DataExtractor.cpp
+++ lldb/trunk/source/Core/DataExtractor.cpp
@@ -1830,10 +1830,8 @@
                             }
                             else if (item_bit_size == ast->getTypeSize(ast->LongDoubleTy))
                             {
-                                auto byte_size = item_byte_size;
                                 const auto &semantics = ast->getFloatTypeSemantics(ast->LongDoubleTy);
-                                if (&semantics == &llvm::APFloat::x87DoubleExtended)
-                                    byte_size = 10;
+                                const auto byte_size = (llvm::APFloat::getSizeInBits(semantics) + 7) / 8;
 
                                 llvm::APInt apint;
                                 if (GetAPInt(*this, &offset, byte_size, apint))