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meson: assume x86-64-v2 baseline ISA

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x86-64-v2 processors were released in 2008, assume that we have one.
Unfortunately there is no GCC flag to enable all the features
without disabling what came after; so enable them one by one.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-05-31 10:37:06 +02:00
parent 72baef13b9
commit 294ac64e45
1 changed files with 7 additions and 3 deletions
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meson.build
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@ -336,9 +336,13 @@ if host_arch == 'i386' and not cc.links('''
qemu_common_flags = ['-march=i486'] + qemu_common_flags
endif
# ??? Only extremely old AMD cpus do not have cmpxchg16b.
# If we truly care, we should simply detect this case at
# runtime and generate the fallback to serial emulation.
# Assume x86-64-v2 (minus CMPXCHG16B for 32-bit code)
if host_arch == 'i386'
qemu_common_flags = ['-mfpmath=sse'] + qemu_common_flags
endif
if host_arch in ['i386', 'x86_64']
qemu_common_flags = ['-mpopcnt', '-msse4.2'] + qemu_common_flags
endif
if host_arch == 'x86_64'
qemu_common_flags = ['-mcx16'] + qemu_common_flags
endif