Switch to CompilerCaching.jl#431
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Replace `cached_compilation` with an `OpenCLResults` struct attached to each `CodeInstance` via `CompilerCaching`: SPIR-V `obj` + entry name + `device_rng` flag are session-portable (cached through precompilation), the runtime library bitcode rides along via `GPUCompiler.bitcode`/`bitcode!`, and the linked `cl.Kernel` is held in a small linear cache keyed by `cl.Context`. The linear cache is needed because `cl.Kernel` is bound to the OpenCL context that built it, but the cache partition (set by `GPUCompiler.cache_owner` on the SPIRV target + OpenCL params) only covers codegen-affecting features. Two contexts on the same device share the same SPIR-V but need distinct kernel handles. Hot-path lookup is one field load + one `===` compare — single-context users (the overwhelming majority) stay at n=1. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
`something(lookup(...), compile_opencl!(...))` evaluated `compile_opencl!` eagerly even on a cache hit, so every kernel launch silently re-ran the full LLVM compile pipeline. Branch explicitly on the lookup result. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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x-ref JuliaGPU/GPUCompiler.jl#794