search for: enter_subblock

Hi, I currently write a tool to parse the LLVM bytecode file (.bc file). So I have some very basic questions: - First, about the Abbreviation ID ( "0"=END_BLOCK, "1"=ENTER_SUBBLOCK...): how to read these ID from the file stream ? I mean, I don't know, how many bit length they are. It doesn't exist on the document. - Second, how is the order to read the bytecode ? For example 4 bytes after the LLVM IR magic nr.: 21 0C 00 00 It describes the MODULE_BLOCK with its pa...

Hi, I currently write a tool to parse the LLVM bytecode file (.bc file). So I have some very basic questions: - First, about the Abbreviation ID ( "0"=END_BLOCK, "1"=ENTER_SUBBLOCK...): how to read these ID from the file stream ? I mean, I don't know, how many bit length they are. It doesn't exist on the document. - Second, how is the order to read the bytecode ? For example 4 bytes after the LLVM IR magic nr.: 21 0C 00 00 It describes the MODULE_BLOCK with its pa...

.../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. > + /// the block, and return true if the block has an error. > bool EnterSubBlock(unsigned BlockID, unsigned *NumWordsP = 0) { > // Save the current block's state on BlockScope. > BlockScope...

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

On Tue, Apr 4, 2017 at 12:36 PM, Duncan P. N. Exon Smith < dexonsmith at apple.com> wrote: > > On 2017-Apr-04, at 12:12, Peter Collingbourne <peter at pcc.me.uk> wrote: > > On Mon, Apr 3, 2017 at 8:13 PM, Mehdi Amini <mehdi.amini at apple.com> wrote: > >> >> On Apr 3, 2017, at 7:08 PM, Peter Collingbourne <peter at pcc.me.uk> wrote: >>