[Bug target/45359] New: poor -march=native choices for VIA C7 Esther processors

["opod at nic-nac-project dot org" <gcc-bugzilla@gcc.gnu.org>]

C7 is a x86 CPU from VIA based on Esther (C5J) core evolved from the Nehemiah+
(C5P) core found in the C3-2 line.

/proc/cpuinfo
processor       : 0
vendor_id       : CentaurHauls
cpu family      : 6
model           : 10
model name      : VIA Esther processor  800MHz
stepping        : 9
cpu MHz         : 399.008
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 pae mce cx8 sep mtrr pge cmov pat
clflush acpi mmx fxsr sse sse2 tm nx up pni est tm2 rng rng_en ace ace_en ace2
ace2_en phe phe_en pmm pmm_en
bogomips        : 798.02
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 32 bits virtual

gcc -v -fverbose-asm -march=native -S test.c
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-pc-linux-gnu/4.5.1/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: ../configure --prefix=/usr
--enable-languages=c,c++,fortran,objc,obj-c++,ada --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--enable-gnu-unique-object --enable-lto --enable-plugin --disable-multilib
--disable-libstdcxx-pch --with-system-zlib --with-ppl --with-cloog
--libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man
--infodir=/usr/share/info
Thread model: posix
gcc version 4.5.1 (GCC) 
COLLECT_GCC_OPTIONS='-v' '-fverbose-asm'  '-S'
 /usr/lib/gcc/i686-pc-linux-gnu/4.5.1/cc1 -quiet -v test.c -march=pentium-m
-mtune=generic -quiet -dumpbase test.c -auxbase test -version -fverbose-asm -o
test.s
[snip]

cat test.s
# GNU C (GCC) version 4.5.1 (i686-pc-linux-gnu)
#       compiled by GNU C version 4.5.1, GMP version 5.0.1, MPFR version
3.0.0-p3, MPC version 0.8.2
# GGC heuristics: --param ggc-min-expand=63 --param ggc-min-heapsize=62811
# options passed:  test.c -march=pentium-m -mtune=generic -fverbose-asm
# options enabled:  -falign-loops -fargument-alias -fauto-inc-dec
# -fbranch-count-reg -fcommon -fdelete-null-pointer-checks -fdwarf2-cfi-asm
# -fearly-inlining -feliminate-unused-debug-types -ffunction-cse -fgcse-lm
# -fident -finline-functions-called-once -fira-share-save-slots
# -fira-share-spill-slots -fivopts -fkeep-static-consts
# -fleading-underscore -fmath-errno -fmerge-debug-strings
# -fmove-loop-invariants -fpcc-struct-return -fpeephole
# -fsched-critical-path-heuristic -fsched-dep-count-heuristic
# -fsched-group-heuristic -fsched-interblock -fsched-last-insn-heuristic
# -fsched-rank-heuristic -fsched-spec -fsched-spec-insn-heuristic
# -fsched-stalled-insns-dep -fshow-column -fsigned-zeros
# -fsplit-ivs-in-unroller -ftrapping-math -ftree-cselim -ftree-forwprop
# -ftree-loop-im -ftree-loop-ivcanon -ftree-loop-optimize
# -ftree-parallelize-loops= -ftree-phiprop -ftree-pta -ftree-reassoc
# -ftree-scev-cprop -ftree-slp-vectorize -ftree-vect-loop-version
# -funit-at-a-time -fvect-cost-model -fverbose-asm
# -fzero-initialized-in-bss -m32 -m80387 -m96bit-long-double
# -maccumulate-outgoing-args -malign-stringops -mfancy-math-387
# -mfp-ret-in-387 -mfused-madd -mglibc -mieee-fp -mmmx -mno-red-zone
# -mno-sse4 -mpush-args -msahf -msse -msse2 -mtls-direct-seg-refs


-- 
           Summary: poor -march=native choices for VIA C7 Esther processors
           Product: gcc
           Version: 4.5.1
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: opod at nic-nac-project dot org
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45359