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Introduce and use rot() in rkiss.h

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Also fix indentation.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-03-07 18:13:02 +01:00
parent 9069193125
commit 76506bd3d1
1 changed files with 15 additions and 11 deletions
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26
src/rkiss.h
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@ -46,24 +46,28 @@ class RKISS {
// Keep variables always together
struct S { uint64_t a, b, c, d; } s;
// Return 64 bit unsigned integer in between [0,2^64-1]
uint64_t rot(uint64_t x, uint64_t k) const {
return (x << k) | (x >> (64 - k));
}
// Return 64 bit unsigned integer in between [0, 2^64 - 1]
uint64_t rand64() {
const uint64_t
e = s.a - ((s.b << 7) | (s.b >> 57));
s.a = s.b ^ ((s.c << 13) | (s.c >> 51));
s.b = s.c + ((s.d << 37) | (s.d >> 27));
s.c = s.d + e;
return s.d = e + s.a;
const uint64_t
e = s.a - rot(s.b, 7);
s.a = s.b ^ rot(s.c, 13);
s.b = s.c + rot(s.d, 37);
s.c = s.d + e;
return s.d = e + s.a;
}
// Init seed and scramble a few rounds
void raninit() {
s.a = 0xf1ea5eed;
s.b = s.c = s.d = 0xd4e12c77;
for (int i = 0; i < 73; i++)
rand64();
s.a = 0xf1ea5eed;
s.b = s.c = s.d = 0xd4e12c77;
for (int i = 0; i < 73; i++)
rand64();
}
public: