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369362
2012 Sep 26
0
[LLVMdev] [PATCH / PROPOSAL] bitcode encoding that is ~15% smaller for large bitcode files...
...// describes function bodies. It can contain a constant block
> + // (CONSTANTS_BLOCK_ID).
> enum FunctionCodes {
> FUNC_CODE_DECLAREBLOCKS = 1, // DECLAREBLOCKS: [n]
>
> diff --git a/lib/Bitcode/Reader/BitcodeReader.cpp b/lib/Bitcode/Reader/BitcodeReader.cpp
> index b69a362..5fd3dfd 100644
> --- a/lib/Bitcode/Reader/BitcodeReader.cpp
> +++ b/lib/Bitcode/Reader/BitcodeReader.cpp
...
> @@ -1495,6 +1497,12 @@ bool BitcodeReader::ParseModule(bool Resume) {
> SeenFirstFunctionBody = true;
> }
>
> + // Remember the encoding st...
2012 Sep 26
9
[LLVMdev] [PATCH / PROPOSAL] bitcode encoding that is ~15% smaller for large bitcode files...
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