Probably you already executed the procedure to include i386 support to Linux:
$ sudo dpkg --add-architecture i386
$ apt-get update
$ sudo apt-get update
$ sudo apt-get install libc6-i386
Even yet your application still not running:
$ ./diehard
bash: ./diehard: No such file or directory
You can run this command to show the needed libraries:
$ objdump -p ./diehard | grep NEEDED
NEEDED libf2c.so.0
NEEDED libm.so.5
NEEDED libc.so.5
Alan C. Assis 
Thanks. I have run i386 binaries in years past but not lately. I will bookmark this should the need arise again.
Yes, currently almost everything is already ported to AMD64. But sometimes we will find some Linux binary that needs i386 support