https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115333
Bug ID: 115333
Summary: -march=native sets --param "l2-cache-size=1024" on
Ryzen 7 7800X3D
Product: gcc
Version: 14.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: kocelfc at tutanota dot com
Target Milestone: ---
For some reason on my Ryzen 7 7800X3D -march=native sets --param
"l2-cache-size=1024" as opposed to it showing the last level cache (L3) which
is 96MB. Is this a bug or is this intentional on 3D V-Cache cpus and maybe
other Zen parts?
`gcc -### -march=native /usr/include/stdlib.h`
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/14/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-14.1.1_p20240601/work/gcc-14-20240601/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/14
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/14/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/14/python
--enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--disable-libunwind-exceptions --enable-checking=release
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo Hardened
14.1.1_p20240601 p1' --with-gcc-major-version-only --enable-libstdcxx-time
--enable-lto --disable-libstdcxx-pch --enable-shared --enable-threads=posix
--enable-__cxa_atexit --enable-clocale=gnu --enable-multilib
--with-multilib-list=m32,m64 --disable-fixed-point --enable-targets=all
--enable-libgomp --disable-libssp --disable-libada --disable-cet
--disable-systemtap --disable-valgrind-annotations --disable-vtable-verify
--disable-libvtv --with-zstd --without-isl --enable-default-pie
--enable-host-pie --enable-host-bind-now --enable-default-ssp
--disable-fixincludes
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.1.1 20240601 (Gentoo Hardened 14.1.1_p20240601 p1)
COLLECT_GCC_OPTIONS='-march=native' '-dumpdir' 'a-'
/usr/libexec/gcc/x86_64-pc-linux-gnu/14/cc1 -quiet /usr/include/stdlib.h
"-march=znver4" -mmmx -mpopcnt -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2
-mavx -mavx2 -msse4a -mno-fma4 -mno-xop -mfma -mavx512f -mbmi -mbmi2 -maes
-mpclmul -mavx512vl -mavx512bw -mavx512dq -mavx512cd -mavx512vbmi -mavx512ifma
-mavx512vpopcntdq -mavx512vbmi2 -mgfni -mvpclmulqdq -mavx512vnni -mavx512bitalg
-mavx512bf16 -mno-avx512vp2intersect -mno-3dnow -madx -mabm -mno-cldemote
-mclflushopt -mclwb -mclzero -mcx16 -mno-enqcmd -mf16c -mfsgsbase -mfxsr
-mno-hle -msahf -mno-lwp -mlzcnt -mmovbe -mno-movdir64b -mno-movdiri -mmwaitx
-mno-pconfig -mpku -mprfchw -mno-ptwrite -mrdpid -mrdrnd -mrdseed -mno-rtm
-mno-serialize -mno-sgx -msha -mshstk -mno-tbm -mno-tsxldtrk -mvaes
-mno-waitpkg -mwbnoinvd -mxsave -mxsavec -mxsaveopt -mxsaves -mno-amx-tile
-mno-amx-int8 -mno-amx-bf16 -mno-uintr -mno-hreset -mno-kl -mno-widekl
-mno-avxvnni -mno-avx512fp16 -mno-avxifma -mno-avxvnniint8 -mno-avxneconvert
-mno-cmpccxadd -mno-amx-fp16 -mno-prefetchi -mno-raoint -mno-amx-complex
-mno-avxvnniint16 -mno-sm3 -mno-sha512 -mno-sm4 -mno-apxf -mno-usermsr --param
"l1-cache-size=32" --param "l1-cache-line-size=64" --param "l2-cache-size=1024"
"-mtune=znver4" -quiet -dumpdir a- -dumpbase stdlib.h -dumpbase-ext .h -o
/tmp/ccpnj3TA.s --output-pch /usr/include/stdlib.h.gch
`lscpu | grep cache`
L1d cache: 256 KiB (8 instances)
L1i cache: 256 KiB (8 instances)
L2 cache: 8 MiB (8 instances)
L3 cache: 96 MiB (1 instance)
