[v2,2/3] x86_64: Add glibc-hwcaps support
Commit Message
The subdirectories match those in the x86-64 psABI:
https://gitlab.com/x86-psABIs/x86-64-ABI/-/commit/77566eb03bc6a326811cb7e9a6b9396884b67c7c
---
sysdeps/x86_64/Makefile | 36 +++++++++++++++-
sysdeps/x86_64/dl-hwcaps-subdirs.c | 66 ++++++++++++++++++++++++++++++
sysdeps/x86_64/tst-glibc-hwcaps.c | 65 +++++++++++++++++++++++++++++
3 files changed, 166 insertions(+), 1 deletion(-)
create mode 100644 sysdeps/x86_64/dl-hwcaps-subdirs.c
create mode 100644 sysdeps/x86_64/tst-glibc-hwcaps.c
Comments
On Mon, Oct 12, 2020 at 8:23 AM Florian Weimer via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> The subdirectories match those in the x86-64 psABI:
>
> https://gitlab.com/x86-psABIs/x86-64-ABI/-/commit/77566eb03bc6a326811cb7e9a6b9396884b67c7c
> ---
> sysdeps/x86_64/Makefile | 36 +++++++++++++++-
> sysdeps/x86_64/dl-hwcaps-subdirs.c | 66 ++++++++++++++++++++++++++++++
> sysdeps/x86_64/tst-glibc-hwcaps.c | 65 +++++++++++++++++++++++++++++
> 3 files changed, 166 insertions(+), 1 deletion(-)
> create mode 100644 sysdeps/x86_64/dl-hwcaps-subdirs.c
> create mode 100644 sysdeps/x86_64/tst-glibc-hwcaps.c
>
> diff --git a/sysdeps/x86_64/Makefile b/sysdeps/x86_64/Makefile
> index 42b97c5cc7..16030715e7 100644
> --- a/sysdeps/x86_64/Makefile
> +++ b/sysdeps/x86_64/Makefile
> @@ -144,7 +144,41 @@ CFLAGS-tst-auditmod10b.c += $(AVX512-CFLAGS)
> CFLAGS-tst-avx512-aux.c += $(AVX512-CFLAGS)
> CFLAGS-tst-avx512mod.c += $(AVX512-CFLAGS)
> endif
> -endif
> +
> +$(objpfx)tst-glibc-hwcaps: \
> + $(objpfx)markermod2-1.so $(objpfx)markermod3-1.so $(objpfx)markermod4-1.so
> +$(objpfx)tst-glibc-hwcaps.out: \
> + $(objpfx)markermod2.so \
> + $(objpfx)glibc-hwcaps/x86-64-v2/markermod2.so \
> + $(objpfx)markermod3.so \
> + $(objpfx)glibc-hwcaps/x86-64-v2/markermod3.so \
> + $(objpfx)glibc-hwcaps/x86-64-v3/markermod3.so \
> + $(objpfx)markermod4.so \
> + $(objpfx)glibc-hwcaps/x86-64-v2/markermod4.so \
> + $(objpfx)glibc-hwcaps/x86-64-v3/markermod4.so \
> + $(objpfx)glibc-hwcaps/x86-64-v4/markermod4.so \
> +
> +$(objpfx)glibc-hwcaps/x86-64-v2/markermod2.so: $(objpfx)markermod2-2.so
> + $(make-target-directory)
> + cp $< $@
> +$(objpfx)glibc-hwcaps/x86-64-v2/markermod3.so: $(objpfx)markermod3-2.so
> + $(make-target-directory)
> + cp $< $@
> +$(objpfx)glibc-hwcaps/x86-64-v3/markermod3.so: $(objpfx)markermod3-3.so
> + $(make-target-directory)
> + cp $< $@
> +$(objpfx)glibc-hwcaps/x86-64-v2/markermod4.so: $(objpfx)markermod4-2.so
> + $(make-target-directory)
> + cp $< $@
> +$(objpfx)glibc-hwcaps/x86-64-v3/markermod4.so: $(objpfx)markermod4-3.so
> + $(make-target-directory)
> + cp $< $@
> +$(objpfx)glibc-hwcaps/x86-64-v4/markermod4.so: $(objpfx)markermod4-4.so
> + $(make-target-directory)
> + cp $< $@
> +
> +
> +endif # $(subdir) == elf
>
> ifeq ($(subdir),csu)
> gen-as-const-headers += tlsdesc.sym rtld-offsets.sym
> diff --git a/sysdeps/x86_64/dl-hwcaps-subdirs.c b/sysdeps/x86_64/dl-hwcaps-subdirs.c
> new file mode 100644
> index 0000000000..c4d8b3a02a
> --- /dev/null
> +++ b/sysdeps/x86_64/dl-hwcaps-subdirs.c
> @@ -0,0 +1,66 @@
> +/* Architecture-specific glibc-hwcaps subdirectories. x86 version.
> + Copyright (C) 2020 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <dl-hwcaps.h>
> +#include <cpu-features.h>
>
Please use <sys/platform/x86.h>.
> +const char _dl_hwcaps_subdirs[] = "x86-64-v4:x86-64-v3:x86-64-v2";
> +enum { subdirs_count = 3 };
> +
> +uint32_t
> +_dl_hwcaps_subdirs_active (void)
> +{
> + int active = 0;
> +
> + /* Test in reverse preference order. */
> +
> + /* x86-64-v2. */
> + if (!(CPU_FEATURE_USABLE (CMPXCHG16B)
> + && CPU_FEATURE_USABLE (LAHF64_SAHF64)
> + && CPU_FEATURE_USABLE (POPCNT)
> + && CPU_FEATURE_USABLE (SSE3)
> + && CPU_FEATURE_USABLE (SSE4_1)
> + && CPU_FEATURE_USABLE (SSE4_2)
> + && CPU_FEATURE_USABLE (SSSE3)))
> + return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
> + ++active;
> +
> + /* x86-64-v3. */
> + if (!(CPU_FEATURE_USABLE (AVX)
> + && CPU_FEATURE_USABLE (AVX2)
> + && CPU_FEATURE_USABLE (BMI1)
> + && CPU_FEATURE_USABLE (BMI2)
> + && CPU_FEATURE_USABLE (F16C)
> + && CPU_FEATURE_USABLE (FMA)
> + && CPU_FEATURE_USABLE (LZCNT)
> + && CPU_FEATURE_USABLE (MOVBE)
> + && CPU_FEATURE_USABLE (OSXSAVE)))
> + return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
> + ++active;
> +
> + /* x86-64-v4. */
> + if (!(CPU_FEATURE_USABLE (AVX512F)
> + && CPU_FEATURE_USABLE (AVX512BW)
> + && CPU_FEATURE_USABLE (AVX512CD)
> + && CPU_FEATURE_USABLE (AVX512DQ)
> + && CPU_FEATURE_USABLE (AVX512VL)))
> + return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
> + ++active;
> +
> + return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
> +}
> diff --git a/sysdeps/x86_64/tst-glibc-hwcaps.c b/sysdeps/x86_64/tst-glibc-hwcaps.c
> new file mode 100644
> index 0000000000..b46e7cb236
> --- /dev/null
> +++ b/sysdeps/x86_64/tst-glibc-hwcaps.c
> @@ -0,0 +1,65 @@
> +/* glibc-hwcaps subdirectory test. x86_64 version.
> + Copyright (C) 2020 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <stdio.h>
> +#include <support/check.h>
> +#include <sys/param.h>
Please include <sys/platform/x86.h>.
> +extern int marker2 (void);
> +extern int marker3 (void);
> +extern int marker4 (void);
> +
> +/* Return the x86-64-vN level, 1 for the baseline. */
> +static int
> +compute_level (void)
> +{
> + /* These checks are not entirely accurate because they are limited
> + by GCC capabilities. But wrong results will only result from
> + inconsistent CPU models involving virtualization. */
Please use
const struct cpu_features *cpu_features
= __x86_get_cpu_features (COMMON_CPUID_INDEX_MAX);
if (CPU_FEATURE_USABLE_P (cpu_features, CMPXCHG16B)
&& CPU_FEATURE_USABLE_P (cpu_features, LAHF64_SAHF64)
&& CPU_FEATURE_USABLE_P (cpu_features, POPCNT)
&& CPU_FEATURE_USABLE_P (cpu_features, MMX)
&& CPU_FEATURE_USABLE_P (cpu_features, SSE)
&& CPU_FEATURE_USABLE_P (cpu_features, SSE2)
&& CPU_FEATURE_USABLE_P (cpu_features, SSE3)
&& CPU_FEATURE_USABLE_P (cpu_features, SSSE3)
&& CPU_FEATURE_USABLE_P (cpu_features, SSE4_1)
&& CPU_FEATURE_USABLE_P (cpu_features, SSE4_2))
...
> + if (!(__builtin_cpu_supports ("sse3")
> + && __builtin_cpu_supports ("sse4.1")
> + && __builtin_cpu_supports ("sse4.2")
> + && __builtin_cpu_supports ("ssse3")))
> + return 1;
> + if (!(__builtin_cpu_supports ("avx")
> + && __builtin_cpu_supports ("avx2")
> + && __builtin_cpu_supports ("bmi")
> + && __builtin_cpu_supports ("bmi2")
> + && __builtin_cpu_supports ("fma")))
> + return 2;
> + if (!(__builtin_cpu_supports ("avx512f")
> + && __builtin_cpu_supports ("avx512bw")
> + && __builtin_cpu_supports ("avx512cd")
> + && __builtin_cpu_supports ("avx512dq")
> + && __builtin_cpu_supports ("avx512vl")))
> + return 3;
> + return 4;
> +}
> +
> +static int
> +do_test (void)
> +{
> + int level = compute_level ();
> + printf ("info: detected x86-64 micro-architecture level: %d\n", level);
> + TEST_COMPARE (marker2 (), MIN (level, 2));
> + TEST_COMPARE (marker3 (), MIN (level, 3));
> + TEST_COMPARE (marker4 (), MIN (level, 4));
> + return 0;
> +}
> +
> +#include <support/test-driver.c>
> --
> Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn,
> Commercial register: Amtsgericht Muenchen, HRB 153243,
> Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill
>
>
* H. J. Lu via Libc-alpha:
>> diff --git a/sysdeps/x86_64/dl-hwcaps-subdirs.c b/sysdeps/x86_64/dl-hwcaps-subdirs.c
>> new file mode 100644
>> index 0000000000..c4d8b3a02a
>> --- /dev/null
>> +++ b/sysdeps/x86_64/dl-hwcaps-subdirs.c
>> +#include <dl-hwcaps.h>
>> +#include <cpu-features.h>
>>
>
> Please use <sys/platform/x86.h>.
How does this work? There is no wrapper header for it, so its
functionality is not really available within ld.so.
>> diff --git a/sysdeps/x86_64/tst-glibc-hwcaps.c b/sysdeps/x86_64/tst-glibc-hwcaps.c
>> new file mode 100644
>> index 0000000000..b46e7cb236
>> --- /dev/null
>> +++ b/sysdeps/x86_64/tst-glibc-hwcaps.c
>> +#include <stdio.h>
>> +#include <support/check.h>
>> +#include <sys/param.h>
>
> Please include <sys/platform/x86.h>.
I don't want to test the implementation against itself. I'd rather use
the GCC functionality and if necessary, add the additional feature
checks by open-coding the CPU analysis.
Thanks,
Florian
On Tue, Oct 13, 2020 at 2:29 AM Florian Weimer <fweimer@redhat.com> wrote:
>
> * H. J. Lu via Libc-alpha:
>
> >> diff --git a/sysdeps/x86_64/dl-hwcaps-subdirs.c b/sysdeps/x86_64/dl-hwcaps-subdirs.c
> >> new file mode 100644
> >> index 0000000000..c4d8b3a02a
> >> --- /dev/null
> >> +++ b/sysdeps/x86_64/dl-hwcaps-subdirs.c
>
> >> +#include <dl-hwcaps.h>
> >> +#include <cpu-features.h>
> >>
> >
> > Please use <sys/platform/x86.h>.
>
> How does this work? There is no wrapper header for it, so its
> functionality is not really available within ld.so.
You are right.
> >> diff --git a/sysdeps/x86_64/tst-glibc-hwcaps.c b/sysdeps/x86_64/tst-glibc-hwcaps.c
> >> new file mode 100644
> >> index 0000000000..b46e7cb236
> >> --- /dev/null
> >> +++ b/sysdeps/x86_64/tst-glibc-hwcaps.c
>
> >> +#include <stdio.h>
> >> +#include <support/check.h>
> >> +#include <sys/param.h>
> >
> > Please include <sys/platform/x86.h>.
>
> I don't want to test the implementation against itself. I'd rather use
> the GCC functionality and if necessary, add the additional feature
> checks by open-coding the CPU analysis.
You need to check all ISAs included in each ISA level.
There are testcases to check that <sys/platform/x86.h>
is correct.
* H. J. Lu via Libc-alpha:
> On Tue, Oct 13, 2020 at 2:29 AM Florian Weimer <fweimer@redhat.com> wrote:
>>
>> * H. J. Lu via Libc-alpha:
>>
>> >> diff --git a/sysdeps/x86_64/dl-hwcaps-subdirs.c b/sysdeps/x86_64/dl-hwcaps-subdirs.c
>> >> new file mode 100644
>> >> index 0000000000..c4d8b3a02a
>> >> --- /dev/null
>> >> +++ b/sysdeps/x86_64/dl-hwcaps-subdirs.c
>>
>> >> +#include <dl-hwcaps.h>
>> >> +#include <cpu-features.h>
>> >>
>> >
>> > Please use <sys/platform/x86.h>.
>>
>> How does this work? There is no wrapper header for it, so its
>> functionality is not really available within ld.so.
>
> You are right.
So this part is okay?
>> >> diff --git a/sysdeps/x86_64/tst-glibc-hwcaps.c b/sysdeps/x86_64/tst-glibc-hwcaps.c
>> >> new file mode 100644
>> >> index 0000000000..b46e7cb236
>> >> --- /dev/null
>> >> +++ b/sysdeps/x86_64/tst-glibc-hwcaps.c
>>
>> >> +#include <stdio.h>
>> >> +#include <support/check.h>
>> >> +#include <sys/param.h>
>> >
>> > Please include <sys/platform/x86.h>.
>>
>> I don't want to test the implementation against itself. I'd rather use
>> the GCC functionality and if necessary, add the additional feature
>> checks by open-coding the CPU analysis.
>
> You need to check all ISAs included in each ISA level.
> There are testcases to check that <sys/platform/x86.h>
> is correct.
Do you still want me to use <sys/platform/x86.h> then?
Thanks,
Florian
On Tue, Oct 13, 2020 at 4:25 AM Florian Weimer <fweimer@redhat.com> wrote:
>
> * H. J. Lu via Libc-alpha:
>
> > On Tue, Oct 13, 2020 at 2:29 AM Florian Weimer <fweimer@redhat.com> wrote:
> >>
> >> * H. J. Lu via Libc-alpha:
> >>
> >> >> diff --git a/sysdeps/x86_64/dl-hwcaps-subdirs.c b/sysdeps/x86_64/dl-hwcaps-subdirs.c
> >> >> new file mode 100644
> >> >> index 0000000000..c4d8b3a02a
> >> >> --- /dev/null
> >> >> +++ b/sysdeps/x86_64/dl-hwcaps-subdirs.c
> >>
> >> >> +#include <dl-hwcaps.h>
> >> >> +#include <cpu-features.h>
> >> >>
> >> >
> >> > Please use <sys/platform/x86.h>.
> >>
> >> How does this work? There is no wrapper header for it, so its
> >> functionality is not really available within ld.so.
> >
> > You are right.
>
> So this part is okay?
Yes.
> >> >> diff --git a/sysdeps/x86_64/tst-glibc-hwcaps.c b/sysdeps/x86_64/tst-glibc-hwcaps.c
> >> >> new file mode 100644
> >> >> index 0000000000..b46e7cb236
> >> >> --- /dev/null
> >> >> +++ b/sysdeps/x86_64/tst-glibc-hwcaps.c
> >>
> >> >> +#include <stdio.h>
> >> >> +#include <support/check.h>
> >> >> +#include <sys/param.h>
> >> >
> >> > Please include <sys/platform/x86.h>.
> >>
> >> I don't want to test the implementation against itself. I'd rather use
> >> the GCC functionality and if necessary, add the additional feature
> >> checks by open-coding the CPU analysis.
> >
> > You need to check all ISAs included in each ISA level.
> > There are testcases to check that <sys/platform/x86.h>
> > is correct.
>
> Do you still want me to use <sys/platform/x86.h> then?
>
Yes.
@@ -144,7 +144,41 @@ CFLAGS-tst-auditmod10b.c += $(AVX512-CFLAGS)
CFLAGS-tst-avx512-aux.c += $(AVX512-CFLAGS)
CFLAGS-tst-avx512mod.c += $(AVX512-CFLAGS)
endif
-endif
+
+$(objpfx)tst-glibc-hwcaps: \
+ $(objpfx)markermod2-1.so $(objpfx)markermod3-1.so $(objpfx)markermod4-1.so
+$(objpfx)tst-glibc-hwcaps.out: \
+ $(objpfx)markermod2.so \
+ $(objpfx)glibc-hwcaps/x86-64-v2/markermod2.so \
+ $(objpfx)markermod3.so \
+ $(objpfx)glibc-hwcaps/x86-64-v2/markermod3.so \
+ $(objpfx)glibc-hwcaps/x86-64-v3/markermod3.so \
+ $(objpfx)markermod4.so \
+ $(objpfx)glibc-hwcaps/x86-64-v2/markermod4.so \
+ $(objpfx)glibc-hwcaps/x86-64-v3/markermod4.so \
+ $(objpfx)glibc-hwcaps/x86-64-v4/markermod4.so \
+
+$(objpfx)glibc-hwcaps/x86-64-v2/markermod2.so: $(objpfx)markermod2-2.so
+ $(make-target-directory)
+ cp $< $@
+$(objpfx)glibc-hwcaps/x86-64-v2/markermod3.so: $(objpfx)markermod3-2.so
+ $(make-target-directory)
+ cp $< $@
+$(objpfx)glibc-hwcaps/x86-64-v3/markermod3.so: $(objpfx)markermod3-3.so
+ $(make-target-directory)
+ cp $< $@
+$(objpfx)glibc-hwcaps/x86-64-v2/markermod4.so: $(objpfx)markermod4-2.so
+ $(make-target-directory)
+ cp $< $@
+$(objpfx)glibc-hwcaps/x86-64-v3/markermod4.so: $(objpfx)markermod4-3.so
+ $(make-target-directory)
+ cp $< $@
+$(objpfx)glibc-hwcaps/x86-64-v4/markermod4.so: $(objpfx)markermod4-4.so
+ $(make-target-directory)
+ cp $< $@
+
+
+endif # $(subdir) == elf
ifeq ($(subdir),csu)
gen-as-const-headers += tlsdesc.sym rtld-offsets.sym
new file mode 100644
@@ -0,0 +1,66 @@
+/* Architecture-specific glibc-hwcaps subdirectories. x86 version.
+ Copyright (C) 2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <dl-hwcaps.h>
+#include <cpu-features.h>
+
+const char _dl_hwcaps_subdirs[] = "x86-64-v4:x86-64-v3:x86-64-v2";
+enum { subdirs_count = 3 };
+
+uint32_t
+_dl_hwcaps_subdirs_active (void)
+{
+ int active = 0;
+
+ /* Test in reverse preference order. */
+
+ /* x86-64-v2. */
+ if (!(CPU_FEATURE_USABLE (CMPXCHG16B)
+ && CPU_FEATURE_USABLE (LAHF64_SAHF64)
+ && CPU_FEATURE_USABLE (POPCNT)
+ && CPU_FEATURE_USABLE (SSE3)
+ && CPU_FEATURE_USABLE (SSE4_1)
+ && CPU_FEATURE_USABLE (SSE4_2)
+ && CPU_FEATURE_USABLE (SSSE3)))
+ return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
+ ++active;
+
+ /* x86-64-v3. */
+ if (!(CPU_FEATURE_USABLE (AVX)
+ && CPU_FEATURE_USABLE (AVX2)
+ && CPU_FEATURE_USABLE (BMI1)
+ && CPU_FEATURE_USABLE (BMI2)
+ && CPU_FEATURE_USABLE (F16C)
+ && CPU_FEATURE_USABLE (FMA)
+ && CPU_FEATURE_USABLE (LZCNT)
+ && CPU_FEATURE_USABLE (MOVBE)
+ && CPU_FEATURE_USABLE (OSXSAVE)))
+ return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
+ ++active;
+
+ /* x86-64-v4. */
+ if (!(CPU_FEATURE_USABLE (AVX512F)
+ && CPU_FEATURE_USABLE (AVX512BW)
+ && CPU_FEATURE_USABLE (AVX512CD)
+ && CPU_FEATURE_USABLE (AVX512DQ)
+ && CPU_FEATURE_USABLE (AVX512VL)))
+ return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
+ ++active;
+
+ return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
+}
new file mode 100644
@@ -0,0 +1,65 @@
+/* glibc-hwcaps subdirectory test. x86_64 version.
+ Copyright (C) 2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <stdio.h>
+#include <support/check.h>
+#include <sys/param.h>
+
+extern int marker2 (void);
+extern int marker3 (void);
+extern int marker4 (void);
+
+/* Return the x86-64-vN level, 1 for the baseline. */
+static int
+compute_level (void)
+{
+ /* These checks are not entirely accurate because they are limited
+ by GCC capabilities. But wrong results will only result from
+ inconsistent CPU models involving virtualization. */
+ if (!(__builtin_cpu_supports ("sse3")
+ && __builtin_cpu_supports ("sse4.1")
+ && __builtin_cpu_supports ("sse4.2")
+ && __builtin_cpu_supports ("ssse3")))
+ return 1;
+ if (!(__builtin_cpu_supports ("avx")
+ && __builtin_cpu_supports ("avx2")
+ && __builtin_cpu_supports ("bmi")
+ && __builtin_cpu_supports ("bmi2")
+ && __builtin_cpu_supports ("fma")))
+ return 2;
+ if (!(__builtin_cpu_supports ("avx512f")
+ && __builtin_cpu_supports ("avx512bw")
+ && __builtin_cpu_supports ("avx512cd")
+ && __builtin_cpu_supports ("avx512dq")
+ && __builtin_cpu_supports ("avx512vl")))
+ return 3;
+ return 4;
+}
+
+static int
+do_test (void)
+{
+ int level = compute_level ();
+ printf ("info: detected x86-64 micro-architecture level: %d\n", level);
+ TEST_COMPARE (marker2 (), MIN (level, 2));
+ TEST_COMPARE (marker3 (), MIN (level, 3));
+ TEST_COMPARE (marker4 (), MIN (level, 4));
+ return 0;
+}
+
+#include <support/test-driver.c>