ded733bd - Add a tool for diffing size remarks

Fri, 29 Oct 2021 01:51:52 +0000

Add a tool for diffing size remarksThis is a tool which can handle bitstream and YAML remarks. The idea here is toprovide more insight into which functions changed in a benchmark when testingcompiler changes.E.g. "foo got 20% bigger, so maybe we should look more closely at that."To use the tool, you can use...```$ llvm-remark-size-diff remarks_file_a remarks_file_b --parser=yaml|bitstream```... on two remarks files containing at least instruction count remarks. Thiswill output some data on instruction count change and also other relevantinformation such as stack size change from `remarks_file_a` to `remarks_file_b`.This is a bit of a WIP so I'm happy to change the format etc. Ultimately I thinkit'd be best to have some JSON output which could be consumed by another tool.But some base-level, greppable output is very handy to have anyway.The format I'm proposing here is``` ```Where the files and increase/decrease are indicated like below:- `` is one of `++` (file B), `--` (file A), `==` (both)- `` is one of `>` (increase) or `<` (decrease)This makes it easy to grep for things like "which functions appeared in A butdid not appear in B?" Or "what are all the instruction count decreases?"Differential Revision: https://reviews.llvm.org/D112940 List of files: /llvm-project-15.0.7/llvm/test/tools/llvm-remark-size-diff/no-difference.test

Changes in no-difference.test

ded733bd - Add a tool for diffing size remarks