march=native not precise on Sempron

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march=native not precise on Sempron
\ Simon Toth (5 Apr 2008)
. \ Uros Bizjak (5 Apr 2008)

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Subject:	march=native not precise on Sempron
Group:	Gcc
From:	Simon Toth
Date:	5 Apr 2008

I have Sempron processor with SSE3 support, but the march=native seems
to ommit the -msse3 option:

----------------------------------------------------------------------
> cat /proc/cpuinfo
----------------------------------------------------------------------
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 44
model name : AMD Sempron(tm) Processor 2600+
stepping : 2
cpu MHz : 1607.351
cache size : 128 KB
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 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt
lm 3dnowext 3dnow rep_good pni lahf_lm
bogomips : 3216.25
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts ttp tm stc
----------------------------------------------------------------------
> echo 'int main(){return 0;}' > test.c && gcc -v -Q -march=native -O2
test.c -o test && rm test.c test
----------------------------------------------------------------------
Using built-in specs.
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/paludis/sys-devel/gcc-4.2.3/work/gcc-4.2.3/configure
--prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.2.3
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.2.3
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.2.3/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.2.3/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3/include/g++-v4
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec
--enable-nls --without-included-gettext --with-system-zlib
--disable-checking --disable-werror --enable-secureplt
--disable-libunwind-exceptions --enable-multilib --enable-libmudflap
--disable-libssp --enable-java-awt=gtk
--enable-languages=c,c++,java,treelang,fortran --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
Thread model: posix
gcc version 4.2.3 (Gentoo 4.2.3 p1.0)
/usr/libexec/gcc/x86_64-pc-linux-gnu/4.2.3/cc1 -v test.c -march=k8
-mtune=k8 -dumpbase test.c -auxbase test -O2 -version -o /tmp/cc3vYxIP.s
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3/include
/usr/include
End of search list.
GNU C version 4.2.3 (Gentoo 4.2.3 p1.0) (x86_64-pc-linux-gnu)
compiled by GNU C version 4.2.3 (Gentoo 4.2.3 p1.0).
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
options passed: -v -march=k8 -mtune=k8 -auxbase -O2
options enabled: -falign-loops -fargument-alias
-fasynchronous-unwind-tables -fbranch-count-reg -fcaller-saves -fcommon
-fcprop-registers -fcrossjumping -fcse-follow-jumps -fcse-skip-blocks
-fdefer-pop -fdelete-null-pointer-checks -fearly-inlining
-feliminate-unused-debug-types -fexpensive-optimizations -ffunction-cse
-fgcse -fgcse-lm -fguess-branch-probability -fident -fif-conversion
-fif-conversion2 -finline-functions-called-once -fipa-pure-const
-fipa-reference -fipa-type-escape -fivopts -fkeep-static-consts
-fleading-underscore -fmath-errno -fmerge-constants -fmove-loop-invariants
-fomit-frame-pointer -foptimize-register-move -foptimize-sibling-calls
-fpeephole -fpeephole2 -freg-struct-return -fregmove -freorder-blocks
-freorder-functions -frerun-cse-after-loop -fsched-interblock -fsched-spec
-fsched-stalled-insns-dep -fschedule-insns2 -fshow-column
-fsplit-ivs-in-unroller -fstrict-aliasing -fstrict-overflow -fthread-jumps
-ftoplevel-reorder -ftrapping-math -ftree-ccp -ftree-ch -ftree-copy-prop
-ftree-copyrename -ftree-dce -ftree-dominator-opts -ftree-dse -ftree-fre
-ftree-loop-im -ftree-loop-ivcanon -ftree-loop-optimize -ftree-lrs
-ftree-pre -ftree-salias -ftree-sink -ftree-sra -ftree-store-ccp
-ftree-store-copy-prop -ftree-ter -ftree-vect-loop-version -ftree-vrp
-funit-at-a-time -funwind-tables -fvar-tracking -fzero-initialized-in-bss
-m128bit-long-double -m3dnow -m64 -m80387 -maccumulate-outgoing-args
-malign-stringops -mfancy-math-387 -mfp-ret-in-387 -mglibc -mieee-fp -mmmx
-mpush-args -mred-zone -msse -msse2 -mtls-direct-seg-refs
Compiler executable checksum: 1764c35c56eeb8eb4d920196074dcf26
main
Analyzing compilation unitPerforming interprocedural optimizations
Assembling functions:
main
Execution times (seconds)
callgraph optimization: 0.00 ( 0%) usr 0.00 ( 0%) sys 0.01 (17%)
wall 0 kB ( 0%) ggc
expand : 0.01 (50%) usr 0.00 ( 0%) sys 0.00 ( 0%)
wall 9 kB ( 1%) ggc
TOTAL : 0.02 0.00 0.06
1920 kB

/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3/../../../../x86_64-pc-linux-gnu/bin/as
-V -Qy -o /tmp/ccI4sCOz.o /tmp/cc3vYxIP.s
GNU assembler version 2.18 (x86_64-pc-linux-gnu) using BFD version (GNU
Binutils) 2.18
/usr/libexec/gcc/x86_64-pc-linux-gnu/4.2.3/collect2 --eh-frame-hdr -m
elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o test
/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3/../../../../lib64/crt1.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3/../../../../lib64/crti.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3/crtbegin.o
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3/../../../../lib64
-L/lib/../lib64 -L/usr/lib/../lib64
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3/../../../../x86_64-pc-linux-gnu/lib
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3/../../.. /tmp/ccI4sCOz.o -lgcc
--as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s
--no-as-needed /usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3/crtend.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.2.3/../../../../lib64/crtn.o
----------------------------------------------------------------------