[llvm] [MCA] New option -scheduling-info (PR #130574)

[Andrea Di Biagio via llvm-commits]

adibiagio wrote:

> > Isn't this what -instruction-tables is for?
> 
> But does not gives same information... You'd like to change output of -instruction-tables? -scheduling-info should be used by llvm developer and -instruction-tables by application developer.

I think Simon has a point.


I think that information like "resource names" and "bypass latency" is also relevant to application developers.
The instruction-tables view was originally inspired by Agner Fog's instruction_tables document. Things like resource names and bypass latency are a good fit for that view.

It would be nicer if your new logic was built on top of the existing instruction tables. At the moment it is designed as a replacement for the instruction info (which personally I don't particularly like).

You could also have an option for printing "throughput" values instead of "reciprocal throughput". 
Anything else, could be just new fields of instruction-tables.

> 
> -scheduling-info output: `Scheduling Info:` `[1]: #uOps` `[2]: Latency` `[3]: Bypass Latency` `[4]: Throughput` `[5]: Resources` `[6]: LLVM OpcodeName` `[1] [2] [3] [4] [5] [6] Instructions:` ` 1 5 2 2.00 V1UnitV,V1UnitV01 BFMLALB_ZZZ bfmlalb z0.s, z1.h, z2.h`
> 
> -instruction-tables output: `Instruction Info:` `[1]: #uOps` `[2]: Latency` `[3]: RThroughput` `[4]: MayLoad` `[5]: MayStore` `[6]: HasSideEffects (U)` `[1] [2] [3] [4] [5] [6] Instructions:` ` 1 5 0.50 bfmlalb z0.s, z1.h, z2.h`



https://github.com/llvm/llvm-project/pull/130574