5e9189d6d1
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>
18 lines
297 B
Python
18 lines
297 B
Python
# slice operations that don't require allocation
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try:
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from micropython import heap_lock, heap_unlock
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except (ImportError, AttributeError):
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heap_lock = heap_unlock = lambda: 0
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b = bytearray(range(10))
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m = memoryview(b)
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heap_lock()
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b[3:5] = b"aa"
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m[5:7] = b"bb"
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heap_unlock()
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print(b)
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