Stream: git-wasmtime

Topic: wasmtime / PR #2327 CL/aarch64: implement the wasm SIMD `...

Wasmtime GitHub notifications bot (Oct 27 2020 at 14:06):

julian-seward1 opened PR #2327 from arm64-simd-dotmul to main:

This patch implements, for aarch64, the following wasm SIMD extensions

i32x4.dot_i16x8_s instruction
https://github.com/WebAssembly/simd/pull/127

It also updates dependencies as follows, in order that the new instruction can
be parsed, decoded, etc:

wat to 1.0.27
wast to 26.0.1
wasmparser to 0.65.0
wasmprinter to 0.2.12

The changes are straightforward:

• new CLIF instruction widening_pairwise_dot_product_s

• translation from wasm into widening_pairwise_dot_product_s

• new AArch64 instructions smull, smull2 (part of the VecRRR group)

• translation from widening_pairwise_dot_product_s to smull ; smull2 ; addv

There is no testcase in this commit, because that is a separate repo. The
implementation has been tested, nevertheless.

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Wasmtime GitHub notifications bot (Oct 27 2020 at 14:29):

julian-seward1 requested yurydelendik for a review on PR #2327.

Wasmtime GitHub notifications bot (Oct 27 2020 at 17:49):

akirilov-arm submitted PR Review.

Wasmtime GitHub notifications bot (Oct 27 2020 at 17:49):

akirilov-arm submitted PR Review.

Wasmtime GitHub notifications bot (Oct 27 2020 at 17:49):

akirilov-arm created PR Review Comment:

Just a comment (no need to take action) - it's probably time to introduce an Inst variant for widening binary operations, so that the handling of the high and the low halves can be streamlined, for example, but we can do this separately. We previously took a shortcut here because Umlal was the only odd man out.

cc @jgouly

Wasmtime GitHub notifications bot (Oct 27 2020 at 17:49):

akirilov-arm created PR Review Comment:

How about panicking and printing the type otherwise?

Wasmtime GitHub notifications bot (Oct 27 2020 at 17:51):

julian-seward1 submitted PR Review.

Wasmtime GitHub notifications bot (Oct 27 2020 at 17:51):

julian-seward1 created PR Review Comment:

Ah, good point, I forgot. Silly me. Will fix.

Wasmtime GitHub notifications bot (Oct 27 2020 at 17:52):

julian-seward1 submitted PR Review.

Wasmtime GitHub notifications bot (Oct 27 2020 at 17:52):

julian-seward1 created PR Review Comment:

Yeah, that sounds like a nice cleanup for a followup. I'm curious though .. when you say "handling of the high and the low halves can be streamlined", what did you have in mind, roughly?

Wasmtime GitHub notifications bot (Oct 27 2020 at 18:06):

akirilov-arm submitted PR Review.

Wasmtime GitHub notifications bot (Oct 27 2020 at 18:06):

akirilov-arm created PR Review Comment:

Have a look at Inst::VecMiscNarrow, which organizes things similarly, but for narrowing operations. TBH I don't have an exact code change in mind (as I said, neither Joey, nor I did anything yet because there was no real need), but having a separate boolean parameter to specify the half is probably going to be the way to do it.

I dislike the ISA's approach (via the vector shape), but it has constraints (encoding space) that are not applicable to the Inst enum. Anyway, the Inst variants don't necessarily map 1:1 to machine instructions, so we can use that to improve ergonomics (e.g. we support bitwise operations on arbitrary vector shapes, not just 8-bit elements).

Wasmtime GitHub notifications bot (Oct 27 2020 at 18:21):

akirilov-arm submitted PR Review.

Wasmtime GitHub notifications bot (Oct 27 2020 at 18:21):

akirilov-arm created PR Review Comment:

Actually even better would be returning Err(CodegenError::...) - @cfallin was previously encouraging this.

Wasmtime GitHub notifications bot (Oct 27 2020 at 22:31):

cfallin submitted PR Review.

Wasmtime GitHub notifications bot (Oct 27 2020 at 22:31):

cfallin created PR Review Comment:

+1; best to propagate the error upward, since we have the types to do so.

Wasmtime GitHub notifications bot (Nov 02 2020 at 17:13):

yurydelendik submitted PR Review.

Wasmtime GitHub notifications bot (Nov 03 2020 at 10:39):

julian-seward1 updated PR #2327 from arm64-simd-dotmul to main:

This patch implements, for aarch64, the following wasm SIMD extensions

i32x4.dot_i16x8_s instruction
https://github.com/WebAssembly/simd/pull/127

It also updates dependencies as follows, in order that the new instruction can
be parsed, decoded, etc:

wat to 1.0.27
wast to 26.0.1
wasmparser to 0.65.0
wasmprinter to 0.2.12

The changes are straightforward:

• new CLIF instruction widening_pairwise_dot_product_s

• translation from wasm into widening_pairwise_dot_product_s

• new AArch64 instructions smull, smull2 (part of the VecRRR group)

• translation from widening_pairwise_dot_product_s to smull ; smull2 ; addv

There is no testcase in this commit, because that is a separate repo. The
implementation has been tested, nevertheless.

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Wasmtime GitHub notifications bot (Nov 03 2020 at 11:37):

julian-seward1 updated PR #2327 from arm64-simd-dotmul to main:

This patch implements, for aarch64, the following wasm SIMD extensions

i32x4.dot_i16x8_s instruction
https://github.com/WebAssembly/simd/pull/127

It also updates dependencies as follows, in order that the new instruction can
be parsed, decoded, etc:

wat to 1.0.27
wast to 26.0.1
wasmparser to 0.65.0
wasmprinter to 0.2.12

The changes are straightforward:

• new CLIF instruction widening_pairwise_dot_product_s

• translation from wasm into widening_pairwise_dot_product_s

• new AArch64 instructions smull, smull2 (part of the VecRRR group)

• translation from widening_pairwise_dot_product_s to smull ; smull2 ; addv

There is no testcase in this commit, because that is a separate repo. The
implementation has been tested, nevertheless.

<!--

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the PR.

• [ ] This has been discussed in issue #..., or if not, please tell us why
  here.

• [ ] A short description of what this does, why it is needed; if the
  description becomes long, the matter should probably be discussed in an issue
  first.

• [ ] This PR contains test cases, if meaningful.

• [ ] A reviewer from the core maintainer team has been assigned for this PR.
  If you don't know who could review this, please indicate so. The list of
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Wasmtime GitHub notifications bot (Nov 03 2020 at 12:17):

akirilov-arm submitted PR Review.

Wasmtime GitHub notifications bot (Nov 03 2020 at 12:40):

julian-seward1 updated PR #2327 from arm64-simd-dotmul to main:

This patch implements, for aarch64, the following wasm SIMD extensions

i32x4.dot_i16x8_s instruction
https://github.com/WebAssembly/simd/pull/127

It also updates dependencies as follows, in order that the new instruction can
be parsed, decoded, etc:

wat to 1.0.27
wast to 26.0.1
wasmparser to 0.65.0
wasmprinter to 0.2.12

The changes are straightforward:

• new CLIF instruction widening_pairwise_dot_product_s

• translation from wasm into widening_pairwise_dot_product_s

• new AArch64 instructions smull, smull2 (part of the VecRRR group)

• translation from widening_pairwise_dot_product_s to smull ; smull2 ; addv

There is no testcase in this commit, because that is a separate repo. The
implementation has been tested, nevertheless.

<!--

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the PR.

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  here.

• [ ] A short description of what this does, why it is needed; if the
  description becomes long, the matter should probably be discussed in an issue
  first.

• [ ] This PR contains test cases, if meaningful.

• [ ] A reviewer from the core maintainer team has been assigned for this PR.
  If you don't know who could review this, please indicate so. The list of
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Wasmtime GitHub notifications bot (Nov 03 2020 at 13:25):

julian-seward1 merged PR #2327.

Last updated: Dec 23 2024 at 12:05 UTC