[Mesa-dev] [PATCH v2 1/2] gallium: Enable ASIMD/NEON on aarch64.

[Matt Turner]

NEON (now called ASIMD) is available on all aarch64 CPUs. Our code was
missing an aarch64 path, leading to util_cpu_caps.has_neon always being
false on aarch64.
---
Here's the simpler patch to just always enable NEON on aarch64. It suits
my purposes, but I can imagine that you may prefer the original patch if
you ever want to do runtime detection of other features on aarch64.

 src/util/u_cpu_detect.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/util/u_cpu_detect.c b/src/util/u_cpu_detect.c
index 52b9ae547d4..4df10c62ef5 100644
--- a/src/util/u_cpu_detect.c
+++ b/src/util/u_cpu_detect.c
@@ -365,7 +365,14 @@ check_os_arm_support(void)
     }
 #endif /* PIPE_OS_LINUX */
 }
-#endif /* PIPE_ARCH_ARM */
+
+#elif defined(PIPE_ARCH_AARCH64)
+static void
+check_os_arm_support(void)
+{
+    util_cpu_caps.has_neon = true;
+}
+#endif /* PIPE_ARCH_ARM || PIPE_ARCH_AARCH64 */
 
 static void
 get_cpu_topology(void)
@@ -534,7 +541,7 @@ util_cpu_detect_once(void)
    }
 #endif /* PIPE_ARCH_X86 || PIPE_ARCH_X86_64 */
 
-#if defined(PIPE_ARCH_ARM)
+#if defined(PIPE_ARCH_ARM) || defined(PIPE_ARCH_AARCH64)
    check_os_arm_support();
 #endif
 
-- 
2.19.2