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random: add RandomMixin::randbits with compile-known bits

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In many cases, it is known at compile time how many bits are requested from
randbits. Provide a variant of randbits that accepts this number as a template,
to make sure the compiler can make use of this knowledge. This is used immediately
in rand32() and randbool(), and a few further call sites.
This commit is contained in:
Pieter Wuille
2024-03-10 12:38:14 -04:00
parent 21ce9d8658
commit ddb7d26cfd
6 changed files with 52 additions and 9 deletions
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2
src/addrman.cpp
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@@ -776,7 +776,7 @@ std::pair<CAddress, NodeSeconds> AddrManImpl::Select_(bool new_only, std::option
const AddrInfo& info{it_found->second};
// With probability GetChance() * chance_factor, return the entry.
if (insecure_rand.randbits(30) < chance_factor * info.GetChance() * (1 << 30)) {
if (insecure_rand.randbits<30>() < chance_factor * info.GetChance() * (1 << 30)) {
LogPrint(BCLog::ADDRMAN, "Selected %s from %s\n", info.ToStringAddrPort(), search_tried ? "tried" : "new");
return {info, info.m_last_try};
}