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Canonical AI event

Metal kernel supports variable hc in dsv4_hc_pre

The dsv4_hc_pre kernels now support variable hc values, previously hardcoded to 4.

20 Sept 20261 verified claims1 sources1 observations
What happened

The official source reports this update: b11064: metal : support arbitrary hc in dsv4_hc_pre. metal : support arbitrary hc in dsv4_hc_pre ( #29169 ) the dsv4_hc_pre kernels hardcoded hc = 4 via a constexpr used with simd_shuffle, so the op was rejected by supports_op for any other hc and fell back to CPU. Kimi-K3 uses dsv4_hc_pre with hc equal to the number of banked checkpoints in the cross-layer residual stack, which grows with the layer index.

Why it matters

This official update documents a development concerning b11064: metal : support arbitrary hc in dsv4_hc_pre. Its practical significance depends on the scope and evidence stated by the source.

What to watch next

Read the official source update and verify its stated scope, evidence and timing before acting on it.

Connected knowledge

Entities affected by this event

Llama Cppsubject
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Evidence trail

Sources behind the event

llama.cpp official releasesb11064: metal : support arbitrary hc in dsv4_hc_pre
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