- 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
biondizzle
1cbb3cf752