$NetBSD: patch-simd_arm__aarch64_jsimd.c,v 1.2 2023/02/01 12:39:30 adam Exp $

NetBSD support.

--- simd/arm/aarch64/jsimd.c.orig	2023-01-28 00:24:41.000000000 +0000
+++ simd/arm/aarch64/jsimd.c
@@ -25,6 +25,9 @@
 #include "../../jsimd.h"
 
 #include <ctype.h>
+#if defined(__NetBSD__)
+#include <sys/sysctl.h>
+#endif
 
 #define JSIMD_FASTLD3  1
 #define JSIMD_FASTST3  2
@@ -124,6 +127,9 @@ init_simd(void)
 #endif
 #if defined(__linux__) || defined(ANDROID) || defined(__ANDROID__)
   int bufsize = 1024; /* an initial guess for the line buffer size limit */
+#elif defined(__NetBSD__)
+  int neon_present;
+  size_t len;
 #endif
 
   if (simd_support != ~0U)
@@ -138,6 +144,10 @@ init_simd(void)
     if (bufsize > SOMEWHAT_SANE_PROC_CPUINFO_SIZE_LIMIT)
       break;
   }
+#elif defined(__NetBSD__)
+  if (sysctlbyname("machdep.neon_present", &neon_present, &len, NULL, 0) == 0
+	&& neon_present != 0)
+    simd_support |= JSIMD_NEON;
 #endif
 
 #ifndef NO_GETENV