Minutes of 2020/6/12 vector TG meeting

Krste Asanovic

We agreed to meet again today (Friday) in usual slot - see member
calendar for details,


Date: 2020/6/12
Task Group: Vector Extension
Chair: Krste Asanovic
Co-Chair: Roger Espasa
Number of Attendees: ~15
Current issues on github: https://github.com/riscv/riscv-v-spec

Issues discussed:

#434 SLEN=VLEN as optional extension

We spent the meeting discussing the register layout options.

We reviewed the alternate approaches other ISAs had taken in handling
widening options, and will update a doc outlining the approaches
others have taken.

Discussion centered around possible microarchitectural approaches to
preserving SLEN=VLEN model in wider machines. There was concern over
the effect of width-oblivious register spill/restore code on
techniques to hide internal layout. Discussion to continue on mailing

Meetings moved to every week to attempt to close spec to 1.0 by end of