From bd0692ba0c2dcf51b92f97d97142c1eae4fa0efc Mon Sep 17 00:00:00 2001
From: Oleg Grenrus <oleg.grenrus@iki.fi>
Date: Mon, 14 May 2018 03:17:41 +0300
Subject: [PATCH] Correct mix64

---
 src/System/Random/SplitMix.hs | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/System/Random/SplitMix.hs b/src/System/Random/SplitMix.hs
index e278b63..6ae7e2c 100644
--- a/src/System/Random/SplitMix.hs
+++ b/src/System/Random/SplitMix.hs
@@ -100,14 +100,12 @@ doubleUlp =  1.0 / fromIntegral (1 `shiftL` 53 :: Word64)
 -- Note: in JDK implementations the mix64 and mix64variant13
 -- (which is inlined into mixGamma) are swapped.
 --
--- It's easy to verify which constants are from MurmurHash3.
--- See the link.
---
 -- I have no idea if swapping them affects statistical properties.
 mix64 :: Word64 -> Word64
 mix64 z0 =
-    let z1 = shiftXorMultiply 33 0xc4ceb9fe1a85ec53 z0
-        z2 = shiftXorMultiply 33 0xff51afd7ed558ccd z1
+   -- MurmurHash3Mixer
+    let z1 = shiftXorMultiply 33 0xff51afd7ed558ccd z0
+        z2 = shiftXorMultiply 33 0xc4ceb9fe1a85ec53 z1
         z3 = shiftXor 33 z2
     in z3