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BUILD_LIST should steal references, similar to BUILD_TUPLE #100146

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lpereira opened this issue Dec 9, 2022 · 0 comments
Open

BUILD_LIST should steal references, similar to BUILD_TUPLE #100146

lpereira opened this issue Dec 9, 2022 · 0 comments
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type-feature A feature request or enhancement

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@lpereira
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lpereira commented Dec 9, 2022 •
edited by bedevere-bot

Currently, the BUILD_LIST opcode adjusts the stack multiple times while items are popped one by one from the stack, rather than employing the more efficient method used by BUILD_TUPLE (that steals the references from the stack).

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@lpereira lpereira added the type-feature A feature request or enhancement label Dec 9, 2022
@bedevere-bot bedevere-bot mentioned this issue Dec 9, 2022
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lpereira added a commit to lpereira/cpython that referenced this issue Dec 9, 2022
@lpereira
pythongh-100146: Steal references from stack when building a list
808385c 
When executing the BUILD_LIST opcode, steal the references from the stack,
in a manner similar to the BUILD_TUPLE opcode.  Implement this by offloading
the logic to a new private API, _PyList_FromArraySteal(), that works similarly
to _PyTuple_FromArraySteal().

This way, instead of performing multiple stack pointer adjustments while the
list is being initialized, the stack is adjusted only once and a fast memory
copy operation is performed in one fell swoop.
lpereira added a commit to lpereira/cpython that referenced this issue Dec 9, 2022
@lpereira
pythongh-100146: Steal references from stack when building a list
9379cd4 
When executing the BUILD_LIST opcode, steal the references from the stack,
in a manner similar to the BUILD_TUPLE opcode.  Implement this by offloading
the logic to a new private API, _PyList_FromArraySteal(), that works similarly
to _PyTuple_FromArraySteal().

This way, instead of performing multiple stack pointer adjustments while the
list is being initialized, the stack is adjusted only once and a fast memory
copy operation is performed in one fell swoop.
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@lpereira