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gh-116968: Reimplement Tier 2 counters (#117144)

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Introduce a unified 16-bit backoff counter type (``_Py_BackoffCounter``),
shared between the Tier 1 adaptive specializer and the Tier 2 optimizer. The
API used for adaptive specialization counters is changed but the behavior is
(supposed to be) identical.

The behavior of the Tier 2 counters is changed:
- There are no longer dynamic thresholds (we never varied these).
- All counters now use the same exponential backoff.
- The counter for ``JUMP_BACKWARD`` starts counting down from 16.
- The ``temperature`` in side exits starts counting down from 64.
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Guido van Rossum 2024-04-04 08:03:27 -07:00 • committed by GitHub
parent 63bbe77d9b
commit 060a96f1a9
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19 changed files with 313 additions and 235 deletions
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PCbuild/pythoncore.vcxproj
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@ -204,6 +204,7 @@
<ClInclude Include="..\Include\internal\pycore_ast.h" />
<ClInclude Include="..\Include\internal\pycore_ast_state.h" />
<ClInclude Include="..\Include\internal\pycore_atexit.h" />
<ClInclude Include="..\Include\internal\pycore_backoff.h" />
<ClInclude Include="..\Include\internal\pycore_bitutils.h" />
<ClInclude Include="..\Include\internal\pycore_brc.h" />
<ClInclude Include="..\Include\internal\pycore_bytes_methods.h" />