From: Mark Wooding <mdw@distorted.org.uk>
Date: Fri, 15 Nov 2019 17:06:46 +0000 (+0000)
Subject: base/dispatch.c: Recognize `CPUFEAT_ARM_NEON' as requesting ARM64 SIMD.
X-Git-Tag: 2.4.5~4
X-Git-Url: https://git.distorted.org.uk/~mdw/catacomb/commitdiff_plain/cb7f92c40acf03e11484389e9f4f6cc045401ca8

base/dispatch.c: Recognize `CPUFEAT_ARM_NEON' as requesting ARM64 SIMD.

The original ARMv8 spec describes the advanced SIMD instructions as
mandatory, but there's a feature flag for them, so I guess that there
might be processors which don't support them.
---

diff --git a/base/dispatch.c b/base/dispatch.c
index 42c64ee5..f0531ea9 100644
--- a/base/dispatch.c
+++ b/base/dispatch.c
@@ -340,6 +340,7 @@ static unsigned hwcaps = 0;
 #  define WANTAUX(_)							\
 	WANT_AT_HWCAP(_)
 #  define CAPMAP(_)							\
+	_(ARM_NEON, "arm:neon")						\
 	_(ARM_AES, "arm:aes")
 #endif
 
@@ -456,6 +457,7 @@ static void probe_hwcaps(void)
 #  endif
 #endif
 #if CPUFAM_ARM64
+  if (probed.hwcap & HWCAP_ASIMD) hw |= HF_ARM_NEON;
   if (probed.hwcap & HWCAP_AES) hw |= HF_ARM_AES;
 #endif