[Pixman] [PATCH 1/4] Fix lcg_rand_u32() to return 32 random bits.

[Søren Sandmann]

From: Søren Sandmann Pedersen <ssp at redhat.com>

The lcg_rand() function only returns 15 random bits, so lcg_rand_u32()
would always have 0 in bit 31 and bit 15. Fix that by calling
lcg_rand() three times, to generate 15, 15, and 2 random bits
respectively.
---
 test/utils.h |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/test/utils.h b/test/utils.h
index 615ad78..a249627 100644
--- a/test/utils.h
+++ b/test/utils.h
@@ -45,9 +45,10 @@ static inline uint32_t
 lcg_rand_u32 (void)
 {
     uint32_t lo = lcg_rand();
-    uint32_t hi = lcg_rand();
+    uint32_t mid = lcg_rand() << 15;
+    uint32_t hi = lcg_rand() << 30;
 
-    return (hi << 16) | lo;
+    return (hi | mid | lo);
 }
 
 /* CRC 32 computation
-- 
1.7.4