pto.mte_l1_fb

pto.mte_l1_fb is part of Cube Data Movement Ops.

Summary

Load FIXPIPE parameter payloads from L1 into fb. Vector pre_quant(...) and pre_relu(...) clauses in the pto.mte_l0c_* writeback family later consume these payloads through fb pointers. See FIXPIPE Model for the writeback pipeline context.

Mechanism

One burst loads %len_burst parameter-load units from %src to %dst. The copy unit is the parameter-load unit of this op — separate from the row size consumed by mte_l0c_* vector payloads. %len_burst and the nburst(...) gaps are counted in these load units, not in bytes and not in destination elements.

After pto.mte_l1_fb materializes the payload in fb, vector pre-ReLU consumers read it as 64B parameter rows and vector pre-quant consumers read it as 128B parameter rows. The payload pointer passed to mte_l0c_* must point at the first row for the logical output tile, and rows must follow the same channel/NZ order consumed by that store.

Syntax

pto.mte_l1_fb %src, %dst, %len_burst
  nburst(%count, %src_gap, %dst_gap)
  : !pto.ptr<T, l1>, !pto.ptr<U, fb>, i64, i64, i64, i64

Inputs

Parameter Width Description
%src ptr L1 source pointer in l1
%dst ptr Scaling/parameter destination pointer in fb
%len_burst i64 Number of parameter-load units per burst
%count i64 Burst count
%src_gap i64 Source gap between bursts, in parameter-load units
%dst_gap i64 Destination gap between bursts, in parameter-load units

Expected Outputs

Result Type Description
None — Writes FIXPIPE parameter payload into the fb destination region.

Side Effects

Reads L1-visible storage; writes FB-visible storage. The result is consumed by subsequent pto.mte_l0c_* writeback ops that reference an fb pointer in their pre_quant or pre_relu clauses.

Constraints

Constraints

  • %src must be in l1, %dst must be in fb.
  • Vector pre_quant and pre_relu consumers require parameter data prepared in the row order documented under FIXPIPE Model.

Examples

pto.mte_l1_fb %l1_fp, %fb_fp, %c2_i64 nburst(%c4_i64, %c0_i64, %c0_i64)
  : !pto.ptr<f32, l1>, !pto.ptr<f32, fb>, i64, i64, i64, i64