As discussed, add a Meson option to configure which x86-64 instruction set to use. QEMU will now default to x86-64-v1 + cmpxchg16b for 64-bit builds (that corresponds to a Pentium 4 for 32-bit builds).
The baseline can be tuned down to Pentium Pro for 32-bit builds (with -Dx86_version=0), or up as desired. Patch "host/i386: assume presence of CMOV" is not reverted because CMOV appeared first in the Pentium Pro. Paolo Paolo Bonzini (6): Revert "host/i386: assume presence of POPCNT" Revert "host/i386: assume presence of SSSE3" Revert "host/i386: assume presence of SSE2" meson: allow configuring the x86-64 baseline meson: remove dead optimization option meson: require compiler support for chosen x86-64 instructions meson.build | 56 ++++++++++++++++++++------------ host/include/i386/host/cpuinfo.h | 2 ++ tcg/i386/tcg-target.h | 5 +-- util/bufferiszero.c | 4 +-- util/cpuinfo-i386.c | 6 ++-- meson_options.txt | 5 +-- scripts/meson-buildoptions.sh | 3 ++ 7 files changed, 52 insertions(+), 29 deletions(-) -- 2.45.2
