Squid doesn't start on an AMD Sempron CPU:

# systemctl start squid.service
Job for squid.service failed. See "systemctl status squid.service" and
"journalctl -xn" for details.
# journalctl -xn
[...]
Jan 29 15:39:23 lisa sh[29458]: /bin/sh: line 1: 29462 Illegal instruction    
/usr/sbin/squid -z -F -N -S -f /etc/squid/squid.conf
[...]

The Squid package is installed correctly:

# rpm -V squid
S.5....T.  c /etc/squid/squid.conf
# rpm -q squid
squid-3.4.4-3.1.14.i586

The Squid binary may contain instructions which do not exist on this CPU
platform.

# cat /proc/cpuinfo 
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 10
model name      : AMD Sempron(tm) 2800+
stepping        : 0
cpu MHz         : 2001.767
cache size      : 256 KB
fdiv_bug        : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow vmmcall
bogomips        : 4003.53
clflush size    : 32
cache_alignment : 32
address sizes   : 34 bits physical, 32 bits virtual
power management: ts