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authorNoah Goldstein <goldstein.w.n@gmail.com>2022-07-13 16:32:59 -0700
committerNoah Goldstein <goldstein.w.n@gmail.com>2022-07-16 03:07:59 -0700
commitceabdcd130ca7043b0fcf2676183d79431d10493 (patch)
treef6ced435023b66ac1f3b519e5b26a60ef8f479dd /sysdeps/x86_64/wcschr.S
parentc353689e49e72f3aafa1a9e68d4f7a4f33a79cbe (diff)
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x86: Add support to build strcmp/strlen/strchr with explicit ISA level
1. Add default ISA level selection in non-multiarch/rtld
   implementations.

2. Add ISA level build guards to different implementations.
    - I.e strcmp-avx2.S which is ISA level 3 will only build if
      compiled ISA level <= 3. Otherwise there is no reason to
      include it as we will always use one of the ISA level 4
      implementations (strcmp-evex.S).

3. Refactor the ifunc selector and ifunc implementation list to use
   the ISA level aware wrapper macros that allow functions below the
   compiled ISA level (with a guranteed replacement) to be skipped.

Tested with and without multiarch on x86_64 for ISA levels:
{generic, x86-64-v2, x86-64-v3, x86-64-v4}

And m32 with and without multiarch.
Diffstat (limited to 'sysdeps/x86_64/wcschr.S')
-rw-r--r--sysdeps/x86_64/wcschr.S13
1 files changed, 9 insertions, 4 deletions
diff --git a/sysdeps/x86_64/wcschr.S b/sysdeps/x86_64/wcschr.S
index 80b12c4286..01a432b899 100644
--- a/sysdeps/x86_64/wcschr.S
+++ b/sysdeps/x86_64/wcschr.S
@@ -1,4 +1,4 @@
-/* wcschr with SSSE3
+/* wcschr dispatch for RTLD and non-multiarch build
    Copyright (C) 2011-2022 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -16,9 +16,14 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
-
 #define WCSCHR	__wcschr
-#include "multiarch/wcschr-sse2.S"
-libc_hidden_def(__wcschr)
+
+#define DEFAULT_IMPL_V1	"multiarch/wcschr-sse2.S"
+#define DEFAULT_IMPL_V3	"multiarch/wcschr-avx2.S"
+#define DEFAULT_IMPL_V4	"multiarch/wcschr-evex.S"
+
+#include "isa-default-impl.h"
+
+libc_hidden_def (__wcschr)
 weak_alias (__wcschr, wcschr)
 libc_hidden_weak (wcschr)