potrf_slm_hole.hh

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#pragma once
 
// The 48 KB dynamic-local-memory launch hole, spelled once for both potrf leaves: a request
// inside this band is refused at enqueue. evidence: docs/perf/potrf.md#potrf-the-48-kb-launch-hole
 
#include <cstddef>
 
namespace batchlas::potrf_native {
 
constexpr std::size_t kPotrfHoleLo = 47104;
constexpr std::size_t kPotrfHoleHi = 49664;
constexpr std::size_t kPotrfHolePadTo = 49920;
 
constexpr std::size_t potrf_hole_padded(std::size_t bytes) {
    return (bytes > kPotrfHoleLo && bytes <= kPotrfHoleHi) ? kPotrfHolePadTo : bytes;
}
 
}  // namespace batchlas::potrf_native