Stream: git-wasmtime

Topic: wasmtime / PR #7449 popcnt should check for sse4.2 suppor...

Wasmtime GitHub notifications bot (Nov 01 2023 at 18:07):

jeffcharles opened PR #7449 from jeffcharles:winch-popcnt-should-check-sse-flag to bytecodealliance:main:

<!--
Please make sure you include the following information:

• If this work has been discussed elsewhere, please include a link to that
  conversation. If it was discussed in an issue, just mention "issue #...".

• Explain why this change is needed. If the details are in an issue already,
  this can be brief.

Our development process is documented in the Wasmtime book:
https://docs.wasmtime.dev/contributing-development-process.html

Please ensure all communication follows the code of conduct:
https://github.com/bytecodealliance/wasmtime/blob/main/CODE_OF_CONDUCT.md
-->
I noticed a failure in Winch's fuzzing with the following:

(module
  (type (;0;) (func (param i64) (result i64)))
  (func (;0;) (type 0) (param i64) (result i64)
    local.get 0
    i64.popcnt
  )
  (export "test" (func 0))
)

with a configuration where has_popcnt was set to true but has_sse42 was set to false with an error message saying:

Cannot emit inst 'popcntq %rax, %rax' for target; failed to match ISA requirements: [Popcnt]

I was able to reproduce the error message with the two new file tests in this PR.

Adding a check in the macroassember to use the fallback if either flag is missing appears to resolve the issue.

Wasmtime GitHub notifications bot (Nov 01 2023 at 18:07):

jeffcharles requested fitzgen for a review on PR #7449.

Wasmtime GitHub notifications bot (Nov 01 2023 at 18:07):

jeffcharles requested wasmtime-compiler-reviewers for a review on PR #7449.

Wasmtime GitHub notifications bot (Nov 01 2023 at 18:09):

fitzgen submitted PR review:

Thanks!

Wasmtime GitHub notifications bot (Nov 01 2023 at 18:09):

fitzgen has enabled auto merge for PR #7449.

Wasmtime GitHub notifications bot (Nov 01 2023 at 19:04):

fitzgen merged PR #7449.

Last updated: Nov 22 2024 at 17:03 UTC