[ET-VK][testing] Create dedicated test binary for pointwise convolutions

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [ET-VK][qconv] Add flexible layout impl for im2col #17249
• [ET-VK][qconv] Add flexible layout impl for quantized pointwise conv #17221
• -> [ET-VK][testing] Create dedicated test binary for pointwise convolutions #17220
• [ET-VK][qconv] Add layout-agnostic general shader for quantized conv #17219
• [ET-VK][quantization] Add layout-flexible clone for int8x4 tensors #17171
• [ET-VK][qconv] Add layout-flexible impl of quantized depthwise conv2d #17108
• [ET-VK][ez] Implement helper functions to get fastest moving dim #17107
• [ET-VK][quantization] Implement layout-flexible quantize/dequantize operators #17106
• [ET-VK] Add alignment fields to PackedDimInfo for padded size calculation #17170
• [ET-VK][testing] Add per-shader timing breakdown to benchmark output #17105

This commit creates a dedicated test binary for pointwise (1x1) convolutions
(test_q8ta_conv2d_pw), separating them from the general 2D convolution tests.
Here are the key changes:

What Changed

1. New Test Binary: test_q8ta_conv2d_pw.cpp (591 lines)

   • Dedicated test file focusing exclusively on pointwise convolutions (kernel
     size 1x1)
   • Contains 9 test configurations ranging from accuracy tests to performance
     cases:
     • Accuracy tests: Various channel configurations (32→3, 64→32, 96→64, 13→7,
       80→40) with different spatial dimensions
     • Performance tests: Larger configurations (160→480, 22→48, 48→48, 128→128)
       exceeding the 100-dim reference limit
   • Tests all combinations of:
     • Storage types: Texture3D, Buffer
     • Int8 memory layouts: 4C1W, 4W4C, 4C
   • Also tests legacy 4W4C implementation via impl_selector="legacy_4w4c"
   • Includes full reference implementation for numerical correctness
     verification
   • Custom FLOP calculator for performance measurements

2. Removed from test_q8ta_conv2d.cpp (44 lines deleted)

   • Removed 6 pointwise convolution configurations that are now covered by the
     new dedicated binary
   • General conv2d tests now focus solely on kernels > 1x1 (3x3, 5x5, etc.)

3. Build System Updates

   • Added test_q8ta_conv2d_pw target to:
     • targets.bzl (Buck2)
     • CMakeLists.txt (CMake)
   • Both fbcode and xplat paths updated (files are mirrored)

4. CI/Workflow Integration

   • Updated executorch_vulkan_eureka_unit_tests.sky to include the new test
     binary in on-device testing workflow

Why This Separation?

Pointwise convolutions (1x1 kernels) are a distinct optimization target with
different performance characteristics than general convolutions. Separating them
enables:

• Focused performance iteration on pointwise-specific shaders
• Cleaner test organization
• Faster test runs when only testing one convolution type

Differential Revision: D92307251

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17220

• 📄 Preview Python docs built from this PR

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

❌ 2 New Failures, 2 Pending, 3 Unrelated Failures

As of commit 26086c2 with merge base 1cffd23 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t b90558e594bc41d1999d1260f2c95f6dc0028e35737207b0c70dc3192de16fc9 /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 02b41af3f8fd2f256ea2e6aa6fb9a208c359d9d2953f817b0d805a29a2ed8740 /exec failed with exit code 1

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

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

• pull / test-samsung-quantmodels-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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