commit 2d0aa8fbc09934ebb867e125623ea411aca9795e
author James Zern <jzern@google.com> Wed Aug 31 16:20:18 2022 -0700
committer James Zern <jzern@google.com> Fri Sep 02 19:00:14 2022 +0000
tree 271a129824015f3eb17054e6b97dde5d9d94ef31
parent 6e66150a5005c5d1030942d5cd44643a7292e592

test/acm_random: add bit entropy comment to Rand15/16

the reason to use the high bits is the same as Rand12() and Rand8()

Change-Id: Iea960a0d433fc2417d0738d39ef94f3c9fc717cc

test/acm_random.h

diff --git a/test/acm_random.h b/test/acm_random.h
index 1025e84..bc38ba4 100644
--- a/test/acm_random.h
+++ b/test/acm_random.h
@@ -34,6 +34,7 @@
   uint16_t Rand16() {
     const uint32_t value =
         random_.Generate(testing::internal::Random::kMaxRange);
+    // There's a bit more entropy in the upper bits of this implementation.
     return (value >> 15) & 0xffff;
   }
 
@@ -42,6 +43,7 @@
   int16_t Rand15() {
     const uint32_t value =
         random_.Generate(testing::internal::Random::kMaxRange);
+    // There's a bit more entropy in the upper bits of this implementation.
     return (value >> 16) & 0x7fff;
   }