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[ROCm][DSV4] Support row-strided inputs in C4 v2 compression - #38919
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Motivation
C4 compression currently assumes a contiguous projection input. The follow-up fusion in #38920 produces zero-copy views into a wider GEMM output, so C4 needs to accept a row stride without copying.
Modifications
Accuracy Tests
test_c4_v2.py:37 passedon gfx950.Speed Tests and Profiling
No standalone performance claim. This PR only enables the zero-copy layout used by #38920.
Checklist