From: Ali Saidi <Ali.Saidi@ARM.com>
Date: Mon, 23 Aug 2010 16:18:39 +0000 (-0500)
Subject: BASE: Fix genrand to generate both 0s and 1s when max equals one.
X-Git-Tag: stable_2012_02_02~920
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7d191366e1b8c3efaf2a08b26483bca82c00e4de;p=gem5.git

BASE: Fix genrand to generate both 0s and 1s when max equals one.
previously was only generating 0s.
---

diff --git a/src/base/random.cc b/src/base/random.cc
index 7daa90b9c..457b0c98b 100644
--- a/src/base/random.cc
+++ b/src/base/random.cc
@@ -65,7 +65,9 @@ Random::~Random()
 uint32_t
 Random::genrand(uint32_t max)
 {
-    int log = ceilLog2(max);
+    if (max == 0)
+        return 0;
+    int log = ceilLog2(max) + 1;
     int shift = (sizeof(uint32_t) * 8 - log);
     uint32_t random;
 
@@ -79,7 +81,9 @@ Random::genrand(uint32_t max)
 uint64_t
 Random::genrand(uint64_t max)
 {
-    int log = ceilLog2(max);
+    if (max == 0)
+        return 0;
+    int log = ceilLog2(max) + 1;
     int shift = (sizeof(uint64_t) * 8 - log);
     uint64_t random;