Jim Mussared
5e9189d6d1
py/vm: Avoid heap-allocating slices when subscripting built-ins.
...
unix port / macos (push) Has been cancelled
unix port / qemu_mips (push) Has been cancelled
unix port / qemu_arm (push) Has been cancelled
unix port / qemu_riscv64 (push) Has been cancelled
unix port / sanitize_address (push) Has been cancelled
unix port / sanitize_undefined (push) Has been cancelled
webassembly port / build (push) Has been cancelled
windows port / build-vs (Debug, x64, dev, 2017, [15, 16)) (push) Has been cancelled
windows port / build-vs (Debug, x64, dev, 2022, [17, 18)) (push) Has been cancelled
windows port / build-vs (Debug, x86, dev, 2017, [15, 16)) (push) Has been cancelled
windows port / build-vs (Debug, x86, dev, 2022, [17, 18)) (push) Has been cancelled
windows port / build-vs (Release, x64, dev, 2017, [15, 16)) (push) Has been cancelled
windows port / build-vs (Release, x64, dev, 2019, [16, 17)) (push) Has been cancelled
windows port / build-vs (Release, x64, dev, 2022, [17, 18)) (push) Has been cancelled
windows port / build-vs (Release, x64, standard, 2017, [15, 16)) (push) Has been cancelled
windows port / build-vs (Release, x64, standard, 2019, [16, 17)) (push) Has been cancelled
windows port / build-vs (Release, x64, standard, 2022, [17, 18)) (push) Has been cancelled
windows port / build-vs (Release, x86, dev, 2017, [15, 16)) (push) Has been cancelled
windows port / build-vs (Release, x86, dev, 2019, [16, 17)) (push) Has been cancelled
windows port / build-vs (Release, x86, dev, 2022, [17, 18)) (push) Has been cancelled
windows port / build-vs (Release, x86, standard, 2017, [15, 16)) (push) Has been cancelled
windows port / build-vs (Release, x86, standard, 2019, [16, 17)) (push) Has been cancelled
windows port / build-vs (Release, x86, standard, 2022, [17, 18)) (push) Has been cancelled
windows port / build-mingw (i686, mingw32, dev) (push) Has been cancelled
windows port / build-mingw (i686, mingw32, standard) (push) Has been cancelled
windows port / build-mingw (x86_64, mingw64, dev) (push) Has been cancelled
windows port / build-mingw (x86_64, mingw64, standard) (push) Has been cancelled
windows port / cross-build-on-linux (push) Has been cancelled
zephyr port / build (push) Has been cancelled
Python code lint and formatting with ruff / ruff (push) Has been cancelled
This commit adds a fast-path optimisation for when a BUILD_SLICE is
immediately followed by a LOAD/STORE_SUBSCR for a native type, to avoid
needing to allocate the slice on the heap.
In some cases (e.g. `a[1:3] = x`) this can result in no allocations at all.
We can't do this for instance types because the get/set/delattr
implementation may keep a reference to the slice.
Adds more tests to the basic slice tests to ensure that a stack-allocated
slice never makes it to Python, and also a heapalloc test that verifies
(when using bytecode) that assigning to a slice is no-alloc.
This work was funded through GitHub Sponsors.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com >
Signed-off-by: Damien George <damien@micropython.org >
2025-07-16 00:12:47 +10:00
