Bytecode File Format Changes:
- File format version number bumped to 4
- Writer will now align nothing
- Reader now only expects alignment for version 3 or earlier
llvm-svn: 15875
diff --git a/llvm/lib/Bytecode/Reader/Reader.h b/llvm/lib/Bytecode/Reader/Reader.h
index ad8b265..5e7a439 100644
--- a/llvm/lib/Bytecode/Reader/Reader.h
+++ b/llvm/lib/Bytecode/Reader/Reader.h
@@ -293,8 +293,11 @@
/// features, for use in future versions of LLVM.
bool hasNoDependentLibraries;
- /// LLVM 1.2 and earlier encoded the file version as part of the module block
- /// but this information may be needed to
+ /// LLVM 1.3 and earlier caused blocks and other fields to start on 32-bit
+ /// aligned boundaries. This can lead to as much as 30% bytecode size overhead
+ /// in various corner cases (lots of long instructions). In LLVM 1.4,
+ /// alignment of bytecode fields was done away with completely.
+ bool hasAlignment;
/// CompactionTypes - If a compaction table is active in the current function,
/// this is the mapping that it contains. We keep track of what resolved type