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GH-135379: Top of stack caching for the JIT. #135465

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GH-135379: Top of stack caching for the JIT. #135465

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579b758
Tier 2 TOS caching. Work in progress
markshannon Jun 11, 2025
489e510
Tier 2 TOS caching, working for interpreter.
markshannon Jun 13, 2025
f603929
Get JIT working
markshannon Jun 13, 2025
cf1d7ab
Fix tool to support 3.11
markshannon Jun 13, 2025
efd7a0a
Add news
markshannon Jun 13, 2025
bb4e6b9
int arithmetic doesn't escape
markshannon Jun 13, 2025
e976b9b
Repair stats
markshannon Jun 13, 2025
11de93e
Add missing type annotation
markshannon Jun 13, 2025
4698695
Pacify mypy
markshannon Jun 13, 2025
33837a7
Add type annotation
markshannon Jun 13, 2025
8bb12ef
Avoid overflow gathering stats
markshannon Jun 13, 2025
920e6de
Reduce spilling
markshannon Jun 13, 2025
45e1abd
Merge branch 'main' into tier-2-tos-caching
markshannon Jun 16, 2025
3d72871
Merge branch 'main' into tier-2-tos-caching
markshannon Jun 17, 2025
0240115
Merge branch 'main' into tier-2-tos-caching
markshannon Jun 19, 2025
2850d72
Improve heuristics for stack caching
markshannon Jun 19, 2025
1c291f1
Merge branch 'main' into tier-2-tos-caching
markshannon Jun 20, 2025
ba2331a
Add news
markshannon Jun 20, 2025
cbee8d2
Fix uop execution stats
markshannon Jun 23, 2025
40988a0
Address review comments
markshannon Jun 23, 2025
76030e9
Address code review
markshannon Jun 26, 2025
991bbea
Merge branch 'main' into tier-2-tos-caching
markshannon Jun 26, 2025
51d4342
Remove blank line
markshannon Jun 26, 2025
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6 changes: 6 additions & 0 deletions 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
caching" in the JIT. It works by keeping 0-3 of the top items in the stack
in registers. The code generator generates multiple versions of thos uops
that do not escape and are relatively small. During JIT compilation, the
copy that produces the least memory traffic is selected, spilling or
reloading values when needed.
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