Merge #9792: FastRandomContext improvements and switch to ChaCha20

4fd2d2f Add a FastRandomContext::randrange and use it (Pieter Wuille)
1632922 Switch FastRandomContext to ChaCha20 (Pieter Wuille)
e04326f Add ChaCha20 (Pieter Wuille)
663fbae FastRandom benchmark (Pieter Wuille)
c21cbe6 Introduce FastRandomContext::randbool() (Pieter Wuille)

Tree-SHA512: 7fff61e3f6d6dc6ac846ca643d877b377db609646dd401a0e8f50b052c6b9bcd2f5fc34de6bbf28f04afd1724f6279ee163ead5f37d724fb782a00239f35db1d

2 files changed, 26 insertions, 1 deletions

diff --git a/src/bench/checkqueue.cpp b/src/bench/checkqueue.cpp
index 6fa9fe4fe8..88a2a570f9 100644
--- a/src/bench/checkqueue.cpp
+++ b/src/bench/checkqueue.cpp
@@ -68,7 +68,7 @@ static void CCheckQueueSpeedPrevectorJob(benchmark::State& state)
         PrevectorJob(){
         }
         PrevectorJob(FastRandomContext& insecure_rand){
-            p.resize(insecure_rand.rand32() % (PREVECTOR_SIZE*2));
+            p.resize(insecure_rand.randrange(PREVECTOR_SIZE*2));
         }
         bool operator()()
         {
diff --git a/src/bench/crypto_hash.cpp b/src/bench/crypto_hash.cpp
index 737d3572ae..5257e60e81 100644
--- a/src/bench/crypto_hash.cpp
+++ b/src/bench/crypto_hash.cpp
@@ -7,6 +7,7 @@
 #include "bench.h"
 #include "bloom.h"
 #include "hash.h"
+#include "random.h"
 #include "uint256.h"
 #include "utiltime.h"
 #include "crypto/ripemd160.h"
@@ -69,6 +70,28 @@ static void SipHash_32b(benchmark::State& state)
     }
 }
 
+static void FastRandom_32bit(benchmark::State& state)
+{
+    FastRandomContext rng(true);
+    uint32_t x;
+    while (state.KeepRunning()) {
+        for (int i = 0; i < 1000000; i++) {
+            x += rng.rand32();
+        }
+    }
+}
+
+static void FastRandom_1bit(benchmark::State& state)
+{
+    FastRandomContext rng(true);
+    uint32_t x;
+    while (state.KeepRunning()) {
+        for (int i = 0; i < 1000000; i++) {
+            x += rng.randbool();
+        }
+    }
+}
+
 BENCHMARK(RIPEMD160);
 BENCHMARK(SHA1);
 BENCHMARK(SHA256);
@@ -76,3 +99,5 @@ BENCHMARK(SHA512);
 
 BENCHMARK(SHA256_32b);
 BENCHMARK(SipHash_32b);
+BENCHMARK(FastRandom_32bit);
+BENCHMARK(FastRandom_1bit);