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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/multiarch/memrchr-evex.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/multiarch/memrchr-evex.S')
-rw-r--r--sysdeps/x86_64/multiarch/memrchr-evex.S4
1 files changed, 3 insertions, 1 deletions
diff --git a/sysdeps/x86_64/multiarch/memrchr-evex.S b/sysdeps/x86_64/multiarch/memrchr-evex.S
index 91329b18dc..ea3a0a0a60 100644
--- a/sysdeps/x86_64/multiarch/memrchr-evex.S
+++ b/sysdeps/x86_64/multiarch/memrchr-evex.S
@@ -16,7 +16,9 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
-#if IS_IN (libc)
+#include <isa-level.h>
+
+#if ISA_SHOULD_BUILD (4)
 
 # include <sysdep.h>
 # include "evex256-vecs.h"