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Julia emits a single by-value load of a large nested aggregate (e.g. an Oceananigans RectilinearGrid passed by reference) feeding several extractvalues. InstCombine only folds extractvalue(load) -> load(gep) for single-use loads, so a multiply-used aggregate load survives to the AGX backend, which crashes lowering it. Apply the same fold without the single-use guard (a codegen heuristic, not a correctness condition). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Julia emits a single by-value load of a large nested aggregate (e.g. an Oceananigans RectilinearGrid passed by reference) feeding several extractvalues. InstCombine only folds extractvalue(load) -> load(gep) for single-use loads, so a multiply-used aggregate load survives to the AGX backend, which crashes lowering it. Apply the same fold without the single-use guard (a codegen heuristic, not a correctness condition).
Closes JuliaGPU/Metal.jl#792