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Mathias's Patch: Perf tuning for gcc + aarch64 #2
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erin2722
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samanca
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Feb 6, 2024
| std::memmove(dst + kShortMemCopy, | ||
| static_cast<const uint8_t*>(src) + kShortMemCopy, | ||
| 64 - kShortMemCopy); | ||
| FixedSizeMemMove<kShortMemCopy>( |
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[Q] We've already copied kShortMemCopy bytes on line 1126. This code used to copy the remaining bytes if size > kShortMemCopy by copying 64 - kShortMemCopy bytes. The new code, however, always copies kShortMemCopy, assuming 2 * kShortMemCopy == 64, right? If so, do we need to have a static assertion verifying this?
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It is defined as 32 on line 1100, 30 lines up. Adding a static assert that 32*2 == 64 seems silly. Also the original AVX impl was relying on this as well.
samanca
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I just have one question for @RedBeard0531, otherwise LGTM.
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Applying google#176 to our fork so that we can upgrade with perf benefits now.