Closed
Bug 1750049
Opened 2 years ago
Closed 2 years ago
[wasm] Generate AVX2 VBROADCASTx for splats
Categories
(Core :: JavaScript: WebAssembly, enhancement, P3)
Core
JavaScript: WebAssembly
Tracking
()
RESOLVED
FIXED
98 Branch
| Tracking | Status | |
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| firefox98 | --- | fixed |
People
(Reporter: yury, Assigned: yury)
References
Details
Attachments
(1 file)
Currently we use slow PSHUFx instructions for any broadcast operation (splat or load_splat). With AVX2 support, we can use specialized VBROADCASTx instructions.
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Assignee | |
Comment 1•2 years ago
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Depends on D136033
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Assignee | |
Comment 2•2 years ago
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There is no much performance win based on my microbenches. The quick scouting internet for latency info somewhat confirming that the performance of pshuf and vbroadcast somewhat identical. The only perceived win I see is in encoding and clarity of float-vs-int data.
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Assignee | |
Comment 3•2 years ago
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Microbenchmarks for v128.loadXX_splat, on the other hand, produce 50% win. Combining load and broadcast into single op makes everything faster.
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Updated•2 years ago
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Attachment #9259167 -
Attachment description: WIP: Bug 1750049 - [wasm] Use AVX2 ops for splat ops. → Bug 1750049 - [wasm] Use AVX2 ops for splat instructions. r?jseward
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Assignee | |
Comment 4•2 years ago
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v128.loadXX_splat is used in Google Meet, Zoom, Lichess so we might see a little win there.
See Also: → 1672697
Pushed by ydelendik@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/3a8c6fb0c928 [wasm] Use AVX2 ops for splat instructions. r=jseward
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Comment 6•2 years ago
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| bugherder | ||
Status: ASSIGNED → RESOLVED
Closed: 2 years ago
status-firefox98:
--- → fixed
Resolution: --- → FIXED
Target Milestone: --- → 98 Branch
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Description
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