[Bug target/67310] New: [PATCH] gcc 4.8.4 fails to compile with -march=native on VIA nano CPU

["jol_indien at yahoo dot fr" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67310

            Bug ID: 67310
           Summary: [PATCH] gcc 4.8.4 fails to compile with -march=native
                    on VIA nano CPU
           Product: gcc
           Version: 4.8.4
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jol_indien at yahoo dot fr
  Target Milestone: ---

Created attachment 36234
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36234&action=edit
patch to properly detect VIA nano CPU

GCC 4.8.4 detects VIA nano CPU as a "core2" one and thus fails to compile any
executable when called with "-march=native":
echo 'int main(){return 0;}' > test.c && gcc -march=native  -O2   test.c -o
test && rm test.c test
test.c:1:0: error: CPU you selected does not support x86-64 instruction set
 int main(){return 0;}
 ^

The attached patch properly detects the VIA nano CPU and sets up the proper
compile flags, ie:
 -march=x86-64 -mcx16 -msahf -mno-movbe -mno-aes
 -mno-pclmul -mno-popcnt -mno-abm -mno-lwp -mno-fma -mno-fma4 -mno-xop
 -mno-bmi -mno-bmi2 -mno-tbm -mno-avx -mno-avx2 -msse3 -mssse3 -mno-sse4.2
 -mno-sse4.1 -mno-lzcnt -mno-rtm -mno-hle -mno-rdrnd -mno-f16c
 -mno-fsgsbase -mno-rdseed -mno-prfchw -mno-adx -mfxsr -mno-xsave
 -mno-xsaveopt --param l1-cache-size=64 --param l1-cache-line-size=64
 --param l2-cache-size=1024 -mtune=generic
which enables:  -mcx16 -mfxsr -mmmx -msahf -msse -msse2 -msse3 -mssse3

Of course, this does not give a full support of this CPU family but allows to
compile properly for it.

Tested with:
vendor_id       : CentaurHauls
cpu family      : 6
model           : 15
model name      : VIA Nano processor U2250 (1.6GHz Capable)
stepping        : 3

Please consider to apply this patch.