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...new and old encoding by using the flag > "-enable-old-style-functions" vs no flags, with llvm-as. I don't know anything much about the bitcode representation, but anyway: > diff --git a/include/llvm/Bitcode/BitstreamReader.h b/include/llvm/Bitcode/BitstreamReader.h > index 3daef78..840f57e 100644 > --- a/include/llvm/Bitcode/BitstreamReader.h > +++ b/include/llvm/Bitcode/BitstreamReader.h > @@ -409,7 +409,7 @@ public: > } > > /// EnterSubBlock - Having read the ENTER_SUBBLOCK abbrevid, enter > - /// the block, and return true if the block is valid...

Hi all, I've been looking into how to make llvm bitcode files smaller. There is one simple change that appears to shrink linked bitcode files by about 15%. See this spreadsheet for some rough data: https://docs.google.com/spreadsheet/ccc?key=0AjRrJHQc4_bddEtJdjdIek5fMDdIdFFIZldZXzdWa0E The change is in how operand ids are encoded in bitcode files. Rather than use an "absolute