Module: xenomai-3
Branch: next
Commit: 66d6caa36403b0f4ce6cc4b4025b7bf12cf5bc51
URL:
http://git.xenomai.org/?p=xenomai-3.git;a=commit;h=66d6caa36403b0f4ce6cc4b4025b7bf12cf5bc51
Author: Dmitriy Cherkasov <dmit...@mperpetuo.com>
Date: Wed Jun 17 16:09:20 2015 -0700
cobalt/arm64: machine.h: use slightly faster ffnz implementation
---
kernel/cobalt/arch/arm64/include/asm/xenomai/machine.h | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/kernel/cobalt/arch/arm64/include/asm/xenomai/machine.h
b/kernel/cobalt/arch/arm64/include/asm/xenomai/machine.h
index 417a7b0..b8290bf 100644
--- a/kernel/cobalt/arch/arm64/include/asm/xenomai/machine.h
+++ b/kernel/cobalt/arch/arm64/include/asm/xenomai/machine.h
@@ -37,13 +37,23 @@
#include <asm/processor.h>
#include <asm/ipipe.h>
#include <asm/cacheflush.h>
+#include <cobalt/kernel/assert.h>
/* D-side always behaves as PIPT on AArch64 (see
arch/arm64/include/asm/cachetype.h) */
#define xnarch_cache_aliasing() 0
static inline __attribute_const__ unsigned long ffnz(unsigned long ul)
{
- return __builtin_ffsl(ul) - 1;
+ int __r;
+
+ /* zero input is not valid */
+ XENO_WARN_ON(COBALT, ul == 0);
+
+ __asm__ ("rbit\t%0, %1\n"
+ "clz\t%0, %0\n"
+ : "=r" (__r) : "r"(ul) : "cc");
+
+ return __r;
}
#include <asm-generic/xenomai/machine.h>
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