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Cortex_m backend: Add softmax support for int8 via CMSIS NN (dim=-1) #16152

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Cortex_m backend: Add softmax support for int8 via CMSIS NN (dim=-1) #16152

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@xingguo01 xingguo01 commented Dec 9, 2025 •
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  • integrate CMSIS softmax into Cortex-M backend
  • add fusion pass/tests for quantized softmax

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai @Sebastian-Larsson @AdrianLundell @psiddh

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pytorch-bot bot commented Dec 9, 2025 •
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🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16152

Note: Links to docs will display an error until the docs builds have been completed.

✅ You can merge normally! (1 Unrelated Failure)

As of commit 6379fd6 with merge base 71ebc50 (image):

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

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@meta-cla meta-cla bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Dec 9, 2025
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xingguo01 commented Dec 9, 2025

@pytorchbot label "ciflow/trunk","partner:arm","release notes:arm"

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To add these label(s) (ciflow/trunk,partner:arm,release notes:arm) to the PR, please first approve the workflows that are awaiting approval (scroll to the bottom of this page).

This helps ensure we don't trigger CI on this PR until it is actually authorized to do so. Please ping one of the reviewers if you do not have access to approve and run workflows.

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xingguo01 commented Dec 9, 2025

@pytorchbot label "ciflow/trunk","partner:arm","release notes:arm"

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pytorch-bot bot commented Dec 9, 2025

Didn't find following labels among repository labels: ciflow/trunk,partner:arm,release notes:arm

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xingguo01 commented Dec 9, 2025

@pytorchbot label "ciflow/trunk"

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xingguo01 commented Dec 9, 2025

@pytorchbot label "partner:arm" "release notes:arm"

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pytorch-bot bot commented Dec 9, 2025

Didn't find following labels among repository labels: partner:arm,release notes:arm

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xingguo01 commented Dec 9, 2025

@pytorchbot label "partner:arm"

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pytorch-bot bot commented Dec 9, 2025

Didn't find following labels among repository labels: partner:arm

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xingguo01 commented Dec 9, 2025

@pytorchbot label "partner: arm"

@pytorch-bot pytorch-bot bot added the partner: arm For backend delegation, kernels, demo, etc. from the 3rd-party partner, Arm label Dec 9, 2025
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xingguo01 commented Dec 9, 2025

@pytorchbot label "release notes: arm"

@pytorch-bot pytorch-bot bot added the release notes: arm Changes to the ARM backend delegate label Dec 9, 2025
@pytorch-bot pytorch-bot bot removed the ciflow/trunk label Dec 9, 2025
@xingguo01 xingguo01 marked this pull request as ready for review December 9, 2025 13:56
@xingguo01 xingguo01 changed the title Add softmax support for int8 in Cortex M (dim=-1) Cortex_m backend: Add softmax support for int8 in Cortex M (dim=-1) Dec 9, 2025
@xingguo01 xingguo01 changed the title Cortex_m backend: Add softmax support for int8 in Cortex M (dim=-1) Cortex_m backend: Add softmax support for int8 via CMSIS NN (dim=-1) Dec 9, 2025
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xingguo01 commented Dec 9, 2025

@psiddh much appreciated if you can have a look

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Add softmax support for int8 in Cortex M (dim=-1)
6379fd6 
- integrate CMSIS softmax into Cortex-M backend
- add fusion pass/tests for quantized softmax
- lint cleanup passes
- Resolved merge conflicts

Change-Id: I0ec19f011069fa1482e2de2ab62b9e7d7f56b2a8
Signed-off-by: Xingguo Li <xingguo.li@arm.com>
@AdrianLundell AdrianLundell requested a review from psiddh December 11, 2025 09:56
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