biondizzle 1cbb3cf752 NVFP4-1.1: Replace threshold rounding with inline PTX cvt.rni/rz/rmi ...

- Add f32_to_i32_rni (cvt.rni.s32.f32) for round-to-nearest-even
- Add f32_to_i32_rz (cvt.rzi.s32.f32) for round-toward-zero
- Add f32_to_i32_rmi (cvt.rmi.s32.f32) for round-to-minus-infinity
- Replace round_rne_u0_8 and abs_scaled_to_e2m1_idx threshold hacks
  with proper PTX hardware rounding in fp8_e4m3_from_float32
- quantize_e2m1_nibble now uses f32_to_i32_rni + LUT logic for half_step
- Add test_ptx_convert.py for inline PTX conversion verification
- This is the CORRECT approach per NVFP4-1.1_INLINE_PTX_APPROACH.md option 1

2026-05-28 04:40:17 +00:00

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