From a376bcc654edc5ad2fb19e3d86be18a23c882437 Mon Sep 17 00:00:00 2001
From: Adam Ierymenko <adam.ierymenko@gmail.com>
Date: Wed, 19 Apr 2017 23:49:26 +0000
Subject: ARM NEON Salsa20/12 in build and selftest. Almost 2X speedup on a
 Raspberry Pi.

---
 ext/arm32-neon-salsa2012-asm/salsa2012.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'ext')

diff --git a/ext/arm32-neon-salsa2012-asm/salsa2012.h b/ext/arm32-neon-salsa2012-asm/salsa2012.h
index 7820a2e6..719b2e0c 100644
--- a/ext/arm32-neon-salsa2012-asm/salsa2012.h
+++ b/ext/arm32-neon-salsa2012-asm/salsa2012.h
@@ -1,6 +1,14 @@
 #ifndef ZT_SALSA2012_ARM32NEON_ASM
 #define ZT_SALSA2012_ARM32NEON_ASM
 
+#if defined(__linux__) || defined(linux) || defined(__LINUX__) || defined(__linux)
+#include <sys/auxv.h>
+#include <asm/hwcap.h>
+#define zt_arm_has_neon() (getauxval(AT_HWCAP) & HWCAP_NEON)
+#else
+#define zt_arm_has_neon() (true)
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
-- 
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