From c5d76179a5cccae5b75dd1b1f2c4037b362a9a35 Mon Sep 17 00:00:00 2001
From: Daniel Micay <danielmicay@gmail.com>
Date: Sat, 25 Aug 2018 18:04:55 -0400
Subject: [PATCH] improve interaction of slot rand with slot mask

---
 malloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/malloc.c b/malloc.c
index b6d9866..603d476 100644
--- a/malloc.c
+++ b/malloc.c
@@ -257,7 +257,7 @@ static size_t get_free_slot(struct random_state *rng, size_t slots, struct slab_
     }
 
     // randomize start location for linear search (uniform random choice is too slow)
-    uint64_t random_split = ~0UL >> get_random_size_uniform(rng, slots);
+    uint64_t random_split = ~(~0UL << get_random_size_uniform(rng, slots));
 
     size_t slot = ffzl(masked | random_split);
     if (slot) {