x86_64: Add glibc-hwcaps support

The subdirectories match those in the x86-64 psABI:

https://gitlab.com/x86-psABIs/x86-64-ABI/-/commit/77566eb03bc6a326811cb7e9a6b9396884b67c7c

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 76 insertions, 0 deletions

diff --git a/sysdeps/x86_64/tst-glibc-hwcaps.c b/sysdeps/x86_64/tst-glibc-hwcaps.c
new file mode 100644
index 0000000000..3075a8286d
--- /dev/null
+++ b/sysdeps/x86_64/tst-glibc-hwcaps.c
@@ -0,0 +1,76 @@
+/* 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>
+#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)
+{
+  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)))
+   return 1;
+ if (!(CPU_FEATURE_USABLE_P (cpu_features, AVX)
+       && CPU_FEATURE_USABLE_P (cpu_features, AVX2)
+       && CPU_FEATURE_USABLE_P (cpu_features, BMI1)
+       && CPU_FEATURE_USABLE_P (cpu_features, BMI2)
+       && CPU_FEATURE_USABLE_P (cpu_features, F16C)
+       && CPU_FEATURE_USABLE_P (cpu_features, FMA)
+       && CPU_FEATURE_USABLE_P (cpu_features, LZCNT)
+       && CPU_FEATURE_USABLE_P (cpu_features, MOVBE)
+       && CPU_FEATURE_USABLE_P (cpu_features, OSXSAVE)))
+   return 2;
+ if (!(CPU_FEATURE_USABLE_P (cpu_features, AVX512F)
+       && CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
+       && CPU_FEATURE_USABLE_P (cpu_features, AVX512CD)
+       && CPU_FEATURE_USABLE_P (cpu_features, AVX512DQ)
+       && CPU_FEATURE_USABLE_P (cpu_features, 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>