For the complete documentation index, see llms.txt. Markdown versions of all pages are available by appending .md to any URL (e.g. /max/get-started.md).

Mojo module

mask_op

Named TileOp struct for QK score masking on gfx950.

Uses TileLayout / Coord Layout Algebra (not hand-rolled integer formulas) to map lanes and registers into the MMA fragment space:

• WarpLayoutT.idx2crd(lane) decomposes the lane into (lane_row, lane_col).
• FragmentLayoutT(Idx[j]) maps register j to its column offset within the MMA fragment.
• FragmentLayoutT.static_product / static_shape[i] expose the fragment size and the per-lane column-group stride.

Fragment layout differs by MMA size:

• 16x16 MMA: 4 regs/lane, flat (1, 4):(1, 1).
• 32x32 MMA: 16 regs/lane organized as 4 groups of 4 cols with stride 8 between groups — nested ((1,(4,4)):(1,(1,8))) (fp8 MFMA pattern).

Structs

• ​MaskTileOp: Apply an MHAMask to the per-lane QK score registers in place.

Was this page helpful?

Thank you! We'll create more content like this.

Thank you for helping us improve!

😔 What went wrong?

Some code doesn’t work

It includes inaccurate information

It's missing information I need

It was difficult to understand

Other

Submit