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mdbx-test: add flipcoin_n().

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Change-Id: I30463c244f44632f0dae13539c5855cba705e639
This commit is contained in:
Leonid Yuriev
2020-10-25 16:32:44 +03:00
parent 73c2e5355f
commit 3c55a27230
2 changed files with 6 additions and 2 deletions
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7
test/utils.cc
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@@ -326,8 +326,8 @@ double double_from_upper(uint64_t salt) {
r.ieee.negative = 0;
r.ieee.exponent = IEEE754_DOUBLE_BIAS;
salt >>= 64 - DBL_MANT_DIG;
r.ieee.mantissa0 = (unsigned)(salt >> 32);
r.ieee.mantissa1 = (unsigned)salt;
r.ieee.mantissa0 = unsigned(salt >> 32);
r.ieee.mantissa1 = unsigned(salt);
return r.d;
#else
const uint64_t top = (UINT64_C(1) << DBL_MANT_DIG) - 1;
@@ -340,6 +340,9 @@ bool flipcoin() { return bleach32((uint32_t)entropy_ticks()) & 1; }
bool flipcoin_x2() { return (bleach32((uint32_t)entropy_ticks()) & 3) == 0; }
bool flipcoin_x3() { return (bleach32((uint32_t)entropy_ticks()) & 7) == 0; }
bool flipcoin_x4() { return (bleach32((uint32_t)entropy_ticks()) & 15) == 0; }
bool flipcoin_n(unsigned n) {
return (bleach64(entropy_ticks()) & ((UINT64_C(1) << n) - 1)) == 0;
}
bool jitter(unsigned probability_percent) {
const uint32_t top = UINT32_MAX - UINT32_MAX % 100;

1
test/utils.h
View File

@@ -358,5 +358,6 @@ bool flipcoin();
bool flipcoin_x2();
bool flipcoin_x3();
bool flipcoin_x4();
bool flipcoin_n(unsigned n);
bool jitter(unsigned probability_percent);
void jitter_delay(bool extra = false);