From: jaszha03 <jason.zhang2@arm.com>
Date: Fri, 27 Sep 2019 16:48:23 +0000 (-0500)
Subject: vppinfra: implement CLIB_PAUSE () for aarch64 platforms
X-Git-Tag: v20.05-rc0~766
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=refs%2Fchanges%2F56%2F22356%2F2;p=vpp.git

vppinfra: implement CLIB_PAUSE () for aarch64 platforms

Define CLIB_PAUSE () to generate the "yield" instruction. No significant
performance changes were observed for clib_spinlock_t and clib_rwlock_t.

Type: feature

Change-Id: I59eb996e61c7a16007517e57e6996567302c1657
Signed-off-by: Jason Zhang <jason.zhang2@arm.com>
Reviewed-by: Lijian Zhang <Lijian.Zhang@arm.com>
---

diff --git a/src/vppinfra/lock.h b/src/vppinfra/lock.h
index 49e849b1bdd..3cfe11cba17 100644
--- a/src/vppinfra/lock.h
+++ b/src/vppinfra/lock.h
@@ -21,6 +21,8 @@
 
 #if __x86_64__
 #define CLIB_PAUSE() __builtin_ia32_pause ()
+#elif defined (__aarch64__) || defined (__arm__)
+#define CLIB_PAUSE() __asm__ ("yield")
 #else
 #define CLIB_PAUSE()
 #endif