http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57355
--- Comment #2 from croutch <croutch at gmail dot com> ---
I have a.
Intel Core i5 3570K 3,4Ghz (Ivy Bridge)
I use gentoo linux with gcc 4.7.3 and those settings.
CFLAGS="-march=native -O2 -pipe"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j4"
>From manual.
core-avx-i = for ivy bridge
Intel Core CPU with 64-bit extensions, MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1,
SSE4.2, AVX, AES, PCLMUL, FSGSBASE, RDRND and F16C instruction set support.
When i use this command i get this output.
$ gcc -c -Q -march=native --help=target | grep march
-march=corei7-avx
for sandy bridge?
And this command shows .
echo "" | gcc -march=native -v -E - 2>&1 | grep cc1
/usr/libexec/gcc/x86_64-pc-linux-gnu/4.7.1/cc1 -E -quiet -v - -march=corei7-avx
-mcx16 -msahf -mno-movbe -maes -mpclmul -mpopcnt -mno-abm -mno-lwp -mno-fma
-mno-fma4 -mno-xop
-mno-bmi -mno-bmi2 -mno-tbm -mavx -mno-avx2 -msse4.2 -msse4.1 -mno-lzcnt
-mrdrnd -mf16c -mfsgsbase --param l1-cache-size=32 --param
l1-cache-line-size=64 --param l2-cache-size=6144 -mtune=generic
I thougth CFLAGS="-march=native -O2 -pipe" should enable most of this ->
core-avx-i in gcc 4.7 with ivy bridge?? not for sandy bridge??
I found same problems in many linux forums.
Here are one with a included patch -
https://bbs.archlinux.org/viewtopic.php?id=156282
Link to patch https://github.com/crondog/misc-patches
