[glibc] Arch64: Add support for SVE2 ifuncs

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b26cc4fbb74f516fc2b26bdfe7e524392d940250

commit b26cc4fbb74f516fc2b26bdfe7e524392d940250
Author: Wilco Dijkstra <[email protected]>
Date:   Wed May 6 15:28:25 2026 +0000

    Arch64: Add support for SVE2 ifuncs
    
    Add support for SVE2 in cpu-features. Minor cleanup of init-arch.h.
    
    Reviewed-by: Yury Khrustalev <[email protected]>

Diff:
---
 sysdeps/aarch64/cpu-features.h                 |  1 +
 sysdeps/aarch64/dl-diagnostics-cpu.c           |  1 +
 sysdeps/aarch64/multiarch/init-arch.h          | 19 +++++--------------
 sysdeps/unix/sysv/linux/aarch64/cpu-features.c |  1 +
 4 files changed, 8 insertions(+), 14 deletions(-)

diff --git a/sysdeps/aarch64/cpu-features.h b/sysdeps/aarch64/cpu-features.h
index d6367a4596..d1377c0dca 100644
--- a/sysdeps/aarch64/cpu-features.h
+++ b/sysdeps/aarch64/cpu-features.h
@@ -69,6 +69,7 @@ struct cpu_features
   bool sve;
   bool unused;
   bool mops;
+  bool sve2;
 };
 
 #endif /* _CPU_FEATURES_AARCH64_H  */
diff --git a/sysdeps/aarch64/dl-diagnostics-cpu.c b/sysdeps/aarch64/dl-diagnostics-cpu.c
index 697868cb25..cbc2645f56 100644
--- a/sysdeps/aarch64/dl-diagnostics-cpu.c
+++ b/sysdeps/aarch64/dl-diagnostics-cpu.c
@@ -48,6 +48,7 @@ _dl_diagnostics_cpu (void)
   print_cpu_features_value ("mte_state",
                             GLRO (dl_aarch64_cpu_features).mte_state);
   print_cpu_features_value ("sve", GLRO (dl_aarch64_cpu_features).sve);
+  print_cpu_features_value ("sve2", GLRO (dl_aarch64_cpu_features).sve2);
   print_cpu_features_value ("zva_size",
                             GLRO (dl_aarch64_cpu_features).zva_size);
 
diff --git a/sysdeps/aarch64/multiarch/init-arch.h b/sysdeps/aarch64/multiarch/init-arch.h
index 8afd91164f..e00d1746d8 100644
--- a/sysdeps/aarch64/multiarch/init-arch.h
+++ b/sysdeps/aarch64/multiarch/init-arch.h
@@ -19,22 +19,13 @@
 #include <ldsodefs.h>
 #include <sys/auxv.h>
 
-/* Make glibc MTE-safe on a system that supports MTE in case user code
-   enables tag checks independently of the mte_status of glibc.  There
-   is currently no ABI contract for enabling tag checks in user code,
-   but this can be useful for debugging with MTE.  */
-#define MTE_ENABLED() (GLRO(dl_hwcap2) & HWCAP2_MTE)
-
 #define INIT_ARCH()							      \
   uint64_t __attribute__((unused)) midr =				      \
     GLRO(dl_aarch64_cpu_features).midr_el1;				      \
   unsigned __attribute__((unused)) zva_size =				      \
     GLRO(dl_aarch64_cpu_features).zva_size;				      \
-  bool __attribute__((unused)) bti =					      \
-    GLRO(dl_aarch64_cpu_features).bti;					      \
-  bool __attribute__((unused)) mte =					      \
-    MTE_ENABLED ();							      \
-  bool __attribute__((unused)) sve =					      \
-    GLRO(dl_aarch64_cpu_features).sve;					      \
-  bool __attribute__((unused)) mops =					      \
-    GLRO(dl_aarch64_cpu_features).mops;
+  bool __attribute__((unused)) bti = GLRO(dl_aarch64_cpu_features).bti;	      \
+  bool __attribute__((unused)) mte = GLRO(dl_hwcap2) & HWCAP2_MTE;	      \
+  bool __attribute__((unused)) sve = GLRO(dl_aarch64_cpu_features).sve;	      \
+  bool __attribute__((unused)) sve2 = GLRO(dl_aarch64_cpu_features).sve2;     \
+  bool __attribute__((unused)) mops = GLRO(dl_aarch64_cpu_features).mops;
diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
index 36bd72bb12..2e8887ce23 100644
--- a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
+++ b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
@@ -125,6 +125,7 @@ init_cpu_features (struct cpu_features *cpu_features)
 
   /* Check if SVE is supported.  */
   cpu_features->sve = GLRO (dl_hwcap) & HWCAP_SVE;
+  cpu_features->sve2 = GLRO (dl_hwcap2) & HWCAP2_SVE2;
 
   /* Check if MOPS is supported.  */
   cpu_features->mops = GLRO (dl_hwcap2) & HWCAP2_MOPS;