Added new `ScanPrefix` accumulate algorithm#15

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anicusan merged 2 commits intomainfrom

metal-accumulate-prefix

Dec 23, 2024

Commits on Dec 23, 2024

Added second accumulate algorithm using coupled lookback of pre-scanned prefixes (one extra kernel launch), with that `ScanPrefixes` algorithm becoming the default on Metal.
anicusan
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Testing block_size=16 for AMDGPU
anicusan
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