powerpc64le: Add glibc-hwcaps support

The "power10" and "power9" subdirectories are selected in a way
that matches the -mcpu=power10 and -mcpu=power9 options of GCC.

1 files changed, 46 insertions, 0 deletions

diff --git a/sysdeps/powerpc/powerpc64/le/dl-hwcaps-subdirs.c b/sysdeps/powerpc/powerpc64/le/dl-hwcaps-subdirs.c
new file mode 100644
index 0000000000..6a21d77649
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/le/dl-hwcaps-subdirs.c
@@ -0,0 +1,46 @@
+/* Architecture-specific glibc-hwcaps subdirectories.  powerpc64le 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 <ldsodefs.h>
+
+const char _dl_hwcaps_subdirs[] = "power10:power9";
+enum { subdirs_count = 2 }; /* Number of components in _dl_hwcaps_subdirs.  */
+
+uint32_t
+_dl_hwcaps_subdirs_active (void)
+{
+  int active = 0;
+
+  /* Test in reverse preference order.  Altivec and VSX are implied by
+     the powerpc64le ABI definition.  */
+
+  /* POWER9.  GCC enables float128 hardware support for -mcpu=power9.  */
+  if ((GLRO (dl_hwcap2) & PPC_FEATURE2_ARCH_3_00) == 0
+      || (GLRO (dl_hwcap2) & PPC_FEATURE2_HAS_IEEE128) == 0)
+    return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
+  ++active;
+
+  /* POWER10.  GCC defines __MMA__ for -mcpu=power10.  */
+  if ((GLRO (dl_hwcap2) & PPC_FEATURE2_ARCH_3_1) == 0
+      || (GLRO (dl_hwcap2) & PPC_FEATURE2_MMA) == 0)
+    return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
+  ++active;
+
+  return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
+}