[llvm-dev] Improving textual IR format for nameless blocks

[Reid Kleckner via llvm-dev]

Thanks so much for making this happen. I have written many, many clang test
cases with convoluted FileCheck regexes that match "label:" and ";
:<numbered label>" so they pass with and without NDEBUG.

On Fri, Feb 22, 2019 at 7:34 AM James Y Knight via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> After watching a few different people get confused about nameless blocks
> in llvm IR, and recalling my own confusion a few years ago, I'd like to
> change the syntax slightly to make it a bit clearer.
>
> This is similar to the change made for instruction names in
> https://llvm.org/PR2480 a decade ago.
>
> Two changes:
> 1. Change the parsing of a numeric block label to parse as a value number
> rather than a string.
> 2. When printing blocks, always print the value number as a proper label,
> except for the initial block.
>
> See proposed change in https://reviews.llvm.org/D58548
>
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