diff mbox series

[17/28] x86_64: Add glibc-hwcaps support

Message ID e475fe134a06dca71b7bab3cd270fb0ef89720fd.1601569371.git.fweimer@redhat.com
State New
Headers show
Series glibc-hwcaps support | expand

Commit Message

Florian Weimer Oct. 1, 2020, 4:33 p.m. UTC
The subdirectories match those in the x86-64 psABI:

https://gitlab.com/x86-psABIs/x86-64-ABI/-/commit/77566eb03bc6a326811cb7e9a6b9396884b67c7c
---
 sysdeps/x86_64/dl-hwcaps-subdirs.c | 69 ++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 sysdeps/x86_64/dl-hwcaps-subdirs.c
diff mbox series

Patch

diff --git a/sysdeps/x86_64/dl-hwcaps-subdirs.c b/sysdeps/x86_64/dl-hwcaps-subdirs.c
new file mode 100644
index 0000000000..0a732a026b
--- /dev/null
+++ b/sysdeps/x86_64/dl-hwcaps-subdirs.c
@@ -0,0 +1,69 @@ 
+/* 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";
+
+int32_t
+_dl_hwcaps_subdirs_active (void)
+{
+  int32_t result = 0;
+  int32_t bit = 1 << 2;
+
+  /* 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 result;
+  result |= bit;
+  bit >>= 1;
+
+  /* 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 result;
+  result |= bit;
+  bit >>= 1;
+
+ /* 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 result;
+  result |= bit;
+  bit >>= 1;
+
+  return result;
+}