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Add generate_identity_sequences helper and replace lambdas with named functors (#4828) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit ## Summary - Add `generate_identity_sequences<N>()` helper that returns `Tuple<Sequence<0>, Sequence<1>, ..., Sequence<N-1>>` - Replace lambdas with named functors in `transform_tensor_descriptor` - Add `unpack_and_merge_sequences` helper functor - Reduces `transform_tensor_descriptor` instantiations from 388 to 32 (92% reduction) ## Motivation Multiple call sites use `generate_tuple([](auto i) { return Sequence<i>{}; }, Number<N>{})` pattern. A named helper reduces lambda instantiations. Additionally, each lambda in `transform_tensor_descriptor` creates a unique closure type, causing the function to be instantiated separately for every call site. Named functors share a single type, so the compiler reuses the same instantiation. ## Changes ### Part 1: generate_identity_sequences helper - Replaces common lambda pattern for generating identity sequences - Each lambda expression creates a unique closure type, causing separate template instantiations at every call site - Named helper shares a single type across all uses ### Part 2: Named functors in transform_tensor_descriptor - Add `unpack_and_merge_sequences` helper to replace lambda in `GetNumOfHiddenDimension` - Use `generate_identity_sequences` in `matrix_padder.hpp` ## Test Plan - [x] Added 7 unit tests: - 4 tests for `generate_identity_sequences` - 3 tests for `unpack_and_merge_sequences` - [ ] Waiting for full CI ## Related PRs This PR merges the functionality from: - ROCm/composable_kernel#3588 (generate_identity_sequences helper) - ROCm/composable_kernel#3589 (Named functors in transform_tensor_descriptor) Part of PR stack for issue #4229 (Reduce CK/CKTile Build Times) **Note:** This PR supersedes #4283, ROCm/composable_kernel#3588 and ROCm/composable_kernel#3589, which can be closed once this is merged.