Stream: git-wasmtime

Topic: wasmtime / PR #10816 x64: Migrate `ShiftR` pseudo-instruc...


view this post on Zulip Wasmtime GitHub notifications bot (May 20 2025 at 19:06):

alexcrichton requested abrown for a review on PR #10816.

view this post on Zulip Wasmtime GitHub notifications bot (May 20 2025 at 19:06):

alexcrichton requested wasmtime-compiler-reviewers for a review on PR #10816.

view this post on Zulip Wasmtime GitHub notifications bot (May 20 2025 at 19:06):

alexcrichton opened PR #10816 from alexcrichton:x64-remove-shiftrr to bytecodealliance:main:

Shifts and rotates were all represented with ShiftR and they're now all represented with individual instructions. Additionally the old Imm8{Gpr,Reg} abstractions were largely removed and/or replace to only be helpers in ISLE.

This does regress pcc a bit more than it already is at due to the shift instructions not being special-cased for pcc processing.

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view this post on Zulip Wasmtime GitHub notifications bot (May 20 2025 at 19:12):

alexcrichton updated PR #10816.

view this post on Zulip Wasmtime GitHub notifications bot (May 20 2025 at 19:35):

cfallin commented on PR #10816:

This does regress pcc a bit more than it already is at due to the shift instructions not being special-cased for pcc processing.

No worries there -- it's already regressed since I last had time to try to push it forward so I'll need to make a comprehensive update in any case.

view this post on Zulip Wasmtime GitHub notifications bot (May 20 2025 at 20:46):

github-actions[bot] commented on PR #10816:

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view this post on Zulip Wasmtime GitHub notifications bot (May 20 2025 at 21:50):

abrown submitted PR review:

Nice; I'm loving all the removed code.

view this post on Zulip Wasmtime GitHub notifications bot (May 20 2025 at 22:11):

abrown merged PR #10816.


Last updated: Dec 06 2025 at 06:05 UTC