[Vulkan] Stop clamping per-row reductions and propagate NaN - #23205
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convert.glslh guarded an fp16 clamp with `#if T == float16_t`, but neither side is a macro, so the preprocessor compares 0 with 0 and the clamp was always on. Per-row buffer sum, mean, amax and amin therefore saturated fp32 and int results at 65504. The clamp is removed. Single-dimension texture and per-row buffer amax and amin now propagate NaN, argmax and argmin return the index of the first NaN as ATen does, and mean divides in the accumulator type. FP16 texture output uses explicit nearest-even conversion so rounding and overflow agree with ATen across drivers. Authored with OpenAI Codex; split planned with Claude Code.
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/23205
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Superseded by #23244, part 5/15 of the ghstack replacement series. The current integration PR is #23254. This PR is closed in favor of the replacement; its previous description and review history are retained.
convert.glslh guarded an fp16 clamp with
#if T == float16_t, but neither side is a macro, so the preprocessor compares 0 with 0 and the clamp was always on. Per-row buffer sum, mean, amax and amin therefore saturated fp32 and int results at 65504. The clamp is removed. Single-dimension texture and per-row buffer amax and amin now propagate NaN, argmax and argmin return the index of the first NaN as ATen does, and mean divides in the accumulator type. FP16 texture output uses explicit nearest-even conversion so rounding and overflow agree with ATen across drivers.Part 5/15 of the Vulkan transformer and operator-conformance stack. Depends on #23204; review against the selected base branch. Integration PR: #23162.
Validation: 3 passed, 2 warnings in 57.33s. Lintrunner and git diff --check pass. Native tests use MoltenVK with portable CPU kernels; hardware and SwiftShader CI are pending.
Authored with OpenAI Codex; split planned with Claude Code.
cc @SS-JIA @manuelcandales @digantdesai @cbilgin