65 lines
3.0 KiB
Markdown
65 lines
3.0 KiB
Markdown
# February 7 project call
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**See the [instructions](../README.md) for details on how to attend**
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## Agenda
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1. Opening, welcome and roll call
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1. Note: meeting notes linked in the invite.
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1. Please help add your name to the meeting notes.
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1. Please help take notes.
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1. Thanks!
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1. Announcements
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1. _Submit a PR to add your announcement here_
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1. Other agenda items
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1. _Submit a PR to add your item here_
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2. avanhatt: ISLE rule verification update/open questions (Alexa, Fraser, Monica).
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## Notes
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### Attendees
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- cfallin
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- avanhatt
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- Monica Pardeshi
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- abrown
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- bnjbvr
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- jlbirch
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- uweigand
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- sparker-arm
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- Fraser Brown
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### Notes
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avanhatt presented ISLE SMT rule verification prototype, currently type and term variants for IR-to-IR verification.
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- avanhatt: open question, what should the syntax be? LHS, extractor, is more complex.
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- cfallin: Feels like global type inference. Annotations on prelude or standard library, keep them out of lowering rules.
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- avanhatt: Agreed, that it would be good to not have to specify downstream rules.
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- cfallin: Recursion could be a problem.
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- uweigand: Not sure I understand the big picture. How do we define formal semantics of backend ISAs?
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- avanhatt: Current research and tools are available for x86 and Arm.
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- cfallin: We don't even have a good prose descriptions of CLIF operations yet.
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- avanhatt: The Alive project managed without formal semantics.
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- uweigand: Will look to see if there's anything for S390.
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- uweigand: Could the semantics annotations be used to generate the isel code?
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- cfallin: Would depend whether it could produce efficient code, would be good for asserts though.
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- avanhatt: Yes, we could use it for asserts to strengthen fuzzing.
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- FB: Could be used for equivalence checks on rust code too.
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# standups
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- sparker-arm: Sizeless vector RFC updated, atomics isle porting.
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- uweigand: Branches and traps lowering changes merged. Implemented atomics, which was complicated for narrow types, involved emitting loops.
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- sparker-arm: Would the SMT verifier be capable of handling loops?
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- uweigand: Still not sure to do about call lowering, as calls can return more than two values.
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- cfallin: Should we do it?
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- uweigand: S390 ABI wants extended values and isle could be useful for this.
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- cfallin: Separate call instruction from arg/return setup..?
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- uweigand: Reorganising ABICaller(Callee?) to simplify the communication between the backend.
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- uweigand: Next moving onto SIMD.
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- abrown: ISLE select lowering for x64, seems like more flag handling infrastructure needs to be added. Now looking at sightglass for instantiation metrics.
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- jlbirch: Worked on a patch for sightglass to automatically trigger benchmarking when a patch is committed. Would like to know why this isn't a good idea for github actions.
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- cfallin: Need to trust that a PR isn't malicious.
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- bnjbvr: Has been working on ittapi for cross-platform Vtune support.
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- abrown: Thanks so much for this.
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- cfallin: Will be thinking about isle rule precedence.
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