pto.mte_l1_bt

pto.mte_l1_bt is part of Cube Data Movement Ops.

Summary

Load an L1 bias payload into the bt address space for later pto.mad_bias or pto.mad_mx_bias consumption. The consumer interprets the result as an N-element bias vector bias[n].

Mechanism

One burst loads %len_burst bias-load units from %src and writes the corresponding bias values to %dst. After each burst except the last, source and destination advance by the burst length plus the corresponding gap. Each unit is the bias-element width for the configured type pair.

Syntax

pto.mte_l1_bt %src, %dst, %len_burst
  nburst(%count, %src_gap, %dst_gap)
  : !pto.ptr<T, l1>, !pto.ptr<U, bt>, i64, i64, i64, i64

Inputs

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

Expected Outputs

Result Type Description
None — Writes bias values into the bt destination region.

Side Effects

Reads L1-visible storage; writes BT-visible storage. The result is consumed by pto.mad_bias / pto.mad_mx_bias later in the cube pipeline.

Constraints

Constraints

  • Supported type pairs: f32 -> f32, i32 -> i32, f16 -> f32, bf16 -> f32.
  • For bf16 -> f32, compact bf16 source values are always widened to f32 bias values. For f16 -> f32, compact f16 source values are widened when the load is used as an f32 bias payload; otherwise the f16 payload is stored in the 32-bit bias slot with unused high bits.
  • Load exactly the channel bias values needed by the consumer tile; the bias payload is not result-shaped.

Examples

pto.mte_l1_bt %l1_bias, %bt, %c1_i64 nburst(%c4_i64, %c0_i64, %c0_i64)
  : !pto.ptr<f16, l1>, !pto.ptr<f32, bt>, i64, i64, i64, i64