[pull] master from ruby:master#407
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pull[bot] merged 18 commits intoturkdevops:masterfrom Oct 28, 2025
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We can fully remove the CCall now.
Fixes Shopify#814 This change specializes the case of calling `Array#pop` on a non frozen array with no arguments. `Array#pop` exists in the non-inlined C function list in the ZJIT SFR performance burndown list. If in the future it is helpful, this patch could be extended to support the case where an argument is provided, but this initial work seeks to elide the ruby frame normally pushed in the case of `Array#pop` without an argument.
It's a call_threshold: 2 test #14933 (comment)
Once we add register spill, the C stack will have not only spilled basic block params but also spilled VRegs. We won't know how many stack slots are used for spilled VRegs until alloc_regs, so you can't compute an offset as of writing LIR.
We can measure how many we can remove by adding type information to C functions, etc.
`hir.rs` was getting rather large, so I've opted to move the inline tests into their own files. This should also help when looking for where to put your tests, as the optimization tests have a dedicated file. Future follow up work could make the layout of test modules more idiomatic to Rust.
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