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‎Misc/NEWS.d/next/Core_and_Builtins/2025-06-20-16-03-59.gh-issue-135379.eDg89T.rst‎

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Implement a limited form of register allocation know as "top of stack
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caching" in the JIT. It works by keeping 0-3 of the top items in the stack
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in registers. The code generator generates multiple versions of thos uops
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that do not escape and are relatively small. During JIT compilation, the
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copy that produces the least memory traffic is selected, spilling or
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reloading values when needed.

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