randread: add FIXME comment for RDRAND

* gl/lib/randread.c: Add a FIXME comment suggesting how to improve
performance by using the RDRAND hardware instruction.

diff --git a/gl/lib/randread.c b/gl/lib/randread.c
index b4979c726c860132ae7ba27a997e896752011e74..a75d9f623566631cbf1ea2228321d6026fff35cb 100644 (file)
--- a/gl/lib/randread.c
+++ b/gl/lib/randread.c
@@ -17,6 +17,9 @@
 
 /* Written by Paul Eggert.  */
 
+/* FIXME: Improve performance by adding support for the RDRAND machine
+   instruction if available (e.g., Ivy Bridge processors).  */
+
 #include <config.h>
 
 #include "randread.h"