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

Duncan Exon Smith via llvm-dev llvm-dev at lists.llvm.org
Fri Feb 22 13:21:37 PST 2019

> On 2019 Feb  22, at 07:33, 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/ <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 <https://reviews.llvm.org/D58548>
I'm in favour of this.  I think it improves readability at low cost.
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