Arm backend: Add support for floor_divide.default

[agrima1304]

Converts floor_divide.default to div.Tensor_mode with rounding_mode = "floor"

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

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• AWS was down, GHA infrastructure effected / recovering

❌ 9 New Failures, 1 Cancelled Job, 10 Unrelated Failures

As of commit e05b531 with merge base ef21739 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 17b7dc838f97cd6f36aa9150d275ac96ef51aaa8a922da85e170cf81076972fc /exec failed with exit code 1
• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t 34b640ac0ff81bbf084822107b2ea1486cdf0acde9a92758127f217395db2450 /exec failed with exit code 1
• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t 79e7b645b831f46b1ee32dcb836765da2a84dcf64e4a022e5dc200e068222c1a /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 7760601c3bb116f7f30a346bef3ca3a26272c8ddfc306280dfe5b805443b879f /exec failed with exit code 1
• Test CUDA Builds / export-voxtral-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t 8ed7d7d1e6f96f5dd116410cf84413aaf545d0e3af6eb5629d124f8efc1a39f3 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-tile-packed / linux-job (gh)
  RuntimeError: Command docker exec -t 0abbc5d2b892f55a528ad2b774fec59431840ad19981994aeeef43bca9f3f743 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-weight-only / linux-job (gh)
  RuntimeError: Command docker exec -t 7eb894acb05829111119c24ef6f3ff0bd182ca511cf664ff0ae6087730dca141 /exec failed with exit code 2
• trunk / test-arm-backend (test_pytest_models_ethosu_fvp) / linux-job (gh)
  RuntimeError: Command docker exec -t f951b30ef04fd9f63bc459f8bac3474f507ad167d85be4c5f1f1869f223d2b5e /exec failed with exit code 1
• trunk / test-llama-runner-mac (fp32, coreml) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• trunk / test-arm-backend (test_pytest_ops_ethosu_fvp) / linux-job (gh)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• pull / test-models-linux (ic4, portable, linux.4xlarge.memory) / linux-job (gh) (matched linux rule in flaky-rules.json)
  docker: Error response from daemon: Get "https://308535385114.dkr.ecr.us-east-1.amazonaws.com/v2/tool/alpine/manifests/sha256:def822f9851ca422481ec6fee59a9966f12b351c62ccb9aca841526ffaa9f748": dial tcp 18.209.201.180:443: i/o timeout.
• pull / unittest / linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / unittest-editable / windows / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-arm-backend (test_models_ethos-u55) / linux-job (gh) (matched linux rule in flaky-rules.json)
  docker: Error response from daemon: Get "https://308535385114.dkr.ecr.us-east-1.amazonaws.com/v2/": context deadline exceeded.
• trunk / test-huggingface-transformers-xnnpack (qwen3-0.6b|xnnpack|--quantize) / linux-job (gh) (matched linux rule in flaky-rules.json)
  Error response from daemon: Get "https://308535385114.dkr.ecr.us-east-1.amazonaws.com/v2/": context deadline exceeded
• trunk / test-qnn-optimum-model (fp32, pvt) / linux-job (gh) (matched linux rule in flaky-rules.json)
  docker: Error response from daemon: Get "https://308535385114.dkr.ecr.us-east-1.amazonaws.com/v2/": context deadline exceeded.

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / android / run-emulator (gh) (trunk failure)
  The process '/usr/bin/sh' failed with exit code 255
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[zingo]

Hi I see some testfails in backends/arm/test/ops/test_floor_div.py::test_floor_divide*
https://github.com/pytorch/executorch/actions/runs/18406911009/job/52448990081?pr=14933

[digantdesai]

+1

[agrima1304]

Hi I see some testfails in backends/arm/test/ops/test_floor_div.py::test_floor_divide* https://github.com/pytorch/executorch/actions/runs/18406911009/job/52448990081?pr=14933

I am working on fixes for the failures 👍