fix: Software E2M1 conversion for SM12x NVFP4 activation quantization#35947

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blake-snc wants to merge 7 commits intovllm-project:mainfrom

blake-snc:fix/nvfp4-sw-e2m1-sm12x

Commits on Mar 5, 2026

[Bugfix] Fix Marlin W4A8-FP8 capability check for SM121+ (Blackwell variants)

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[Bugfix] Fix SM121 (DGX Spark) exclusion from Marlin/CUTLASS FP8 paths

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Use bounded SM12x family checks instead of unbounded >= 120

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fix: Add software E2M1 conversion for SM12x NVFP4 activation quantization

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fix: Use round-to-nearest-even in software E2M1 + refactor helper

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style: fix clang-format alignment in sw_float_to_e2m1

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Commits on Mar 24, 2026

Merge branch 'main' into fix/nvfp4-sw-e2m1-sm12x
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