abseil-cpp

mirror of https://github.com/abseil/abseil-cpp.git synced 2026-06-04 12:07:05 +08:00

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Vitaly Goldshteyn 742e99ce1a Specialize long strings hash for ARM to benefit from AES instruction differences.

```
name                                     CYCLES/op     CYCLES/op   vs base
BM_HASHING_Combine_contiguous_Fleet_hot  540.0m ±  2%   507.0m ± 2%   -6.11% (p=0.002 n=6)
BM_HASHING_Combine_contiguous_Fleet_cold  2.124 ± 12%    2.027 ± 3%   -4.54% (p=0.041 n=6)
```

ASM diff
1. 33-64: -4 cycles https://godbolt.org/z/nEYEKP4M3
2. 65+: -6 cycles https://godbolt.org/z/xsnjh678c
3. -104 bytes of binary size: https://godbolt.org/z/j8absY8M8

PiperOrigin-RevId: 866058683
Change-Id: I7d2f13532ce4fd2bec0382af0ba116967d5aa063

2026-02-05 12:19:14 -08:00