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Optimize memcpy, memmove and memset#405

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Amanieu merged 5 commits intorust-lang:masterrust-lang/compiler-builtins:masterfrom nbdd0121:masternbdd0121/compiler-builtins:masterCopy head branch name to clipboardAug 31, 2021

Commits

Commits on Aug 21, 2021

• Add test cases for memcpy, memmove and memset for different alignment

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• Implement word-sized copy

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• Add misaligned benchmarks

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• Add different misaligned path for archs with unaligned support

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Commits on Aug 30, 2021

• Use atomic_load_unordered for first word load in misaligned case

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