From: Adrien Gallouët <redacted>
Date: Tue, 2 Dec 2025 16:21:11 +0000 (+0100)
Subject: ggml : use svcntb() for SVE vector length detection (llama/17474)
X-Git-Tag: upstream/0.9.4.395~79
X-Git-Url: https://git.djapps.eu/?a=commitdiff_plain;h=35661286b8896cce5952b01644a85749f4f5f41d;p=pkg%2Fggml%2Fsources%2Fggml

ggml : use svcntb() for SVE vector length detection (llama/17474)

Signed-off-by: Adrien Gallouët <redacted>
---

diff --git a/src/ggml-cpu/ggml-cpu.c b/src/ggml-cpu/ggml-cpu.c
index 3247af8b..e19e82ac 100644
--- a/src/ggml-cpu/ggml-cpu.c
+++ b/src/ggml-cpu/ggml-cpu.c
@@ -683,22 +683,14 @@ bool ggml_is_numa(void) {
 }
 
 #if defined(__ARM_ARCH)
-
-#if defined(__linux__) && defined(__aarch64__)
-#include <sys/auxv.h>
-#endif
-
-static void ggml_init_arm_arch_features(void) {
 #if defined(__aarch64__) && defined(__ARM_FEATURE_SVE)
-#if defined(__linux__)
-    ggml_arm_arch_features.sve_cnt = PR_SVE_VL_LEN_MASK & prctl(PR_SVE_GET_VL);
+#include <arm_sve.h>
+static void ggml_init_arm_arch_features(void) {
+    ggml_arm_arch_features.sve_cnt = svcntb();
+}
 #else
-    // TODO: add support of SVE for non-linux systems
-#error "TODO: SVE is not supported on this platform. To use SVE, sve_cnt needs to be initialized here."
-#endif
+static void ggml_init_arm_arch_features(void) {}
 #endif
-}
-
 #endif // __ARM_ARCH
 
 struct ggml_tensor * ggml_new_i32(struct ggml_context * ctx, int32_t value) {