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gh-160247: Reduce padding in _PyInstructionSequence #160271

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gh-160247: Reduce padding in _PyInstructionSequence #160271

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1c2143b
perf(compiler): reduce padding in _PyInstructionSequence
ashm-dev Oct 22, 2026
94f111d
Merge branch 'main' into gh-160247
ashm-dev Oct 22, 2026
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2 changes: 1 addition & 1 deletion Include/internal/pycore_instruction_sequence.h
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Expand Up @@ -40,8 +40,8 @@ typedef struct instruction_sequence {
/* Map of a label id to instruction offset (index into s_instrs).
* If s_labelmap is NULL, then each label id is the offset itself.
*/
int *s_labelmap;
int s_labelmap_size;
int *s_labelmap;

/* PyList of instruction sequences of nested functions */
PyObject *s_nested;
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-10-22-20-18-44.gh-issue-160247.WC8hRU.rst
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@@ -0,0 +1,2 @@
Reduce padding in the internal instruction sequence structure, saving 8 bytes
per instance on 64-bit platforms. Patch by Shamil Abdulaev.
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