http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48743
Summary: -march=native mis-detects AMD K6-2+ / K6-3 as Athlon -
compiled C fails with "illegal instruction"
Product: gcc
Version: 4.5.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: gcc.gnu....@stellar.eclipse.co.uk
Created attachment 24084
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24084
Output of `echo | gcc -dM -E - -march=native`
When I compile nano on my Linux system using `-march=i586`, `-march=k6-2` or
`-march=k6-3` it works fine.
If I compile it with `-march=native` then nano crashes on startup saying
"illegal instruction".
/proc/cpuinfo seems to show the CPU correctly:
# cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 5
model : 13
model name : AMD-K6(tm)-III Processor
stepping : 4
cpu MHz : 448.140
cache size : 128 KB
fdiv_bug : no
hlt_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 cx8 pge mmx syscall 3dnowext 3dnow
k6_mtrr
bogomips : 896.28
clflush size : 32
cache_alignment : 32
address sizes : 32 bits physical, 32 bits virtual
power management: ts fid vid
However gcc seems to misdetect it:
# gcc -v -Q --help=target -march=native 2>&1 | grep march
/usr/libexec/gcc/i586-pc-linux-gnu/4.5.2/cc1 -v help-dummy -D_FORTIFY_SOURCE=2
-march=athlon --param l1-cache-size=32 --param l1-cache-line-size=32 --param
l2-cache-size=128 -mtune=athlon -dumpbase help-dummy -auxbase help-dummy
-version -fhelp=target -o /tmp/ccQrke9q.s
-march= athlon
# cc -march=native -E -v - </dev/null 2>&1 | grep cc1
/usr/libexec/gcc/i586-pc-linux-gnu/4.5.2/cc1 -E -quiet -v -
-D_FORTIFY_SOURCE=2 -march=athlon --param l1-cache-size=32 --param
l1-cache-line-size=32 --param l2-cache-size=128 -mtune=athlon
Output of `echo | gcc -dM -E - -march=native` attached.
