Files
bitcoin/src
Wladimir J. van der Laan 29e82e460e Merge #15250: Use RdSeed when available, and reduce RdRand load
1435fabc19 Use RdSeed when available, and reduce RdRand load (Pieter Wuille)

Pull request description:

  This introduces support for autodetecting and using the RdSeed instruction on x86/x86_64 systems.

  In addition:
  * In SeedFast, only 64 bits of entropy are generated through RdRand (256 was relatively slow).
  * In SeedStartup, 256 bits of entropy are generated, using RdSeed (preferably) or RdRand (otherwise).

Tree-SHA512: fb7d3e22e93e14592f4b07282aa79d7c3cc4e9debdd9978580b8d2562bbad345e289bf3f80de2c50c9b50b8bac2aa9b838f9f272f7f8d43f1efc0913aa8acce3
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