Use yield instead of pause on arm.

1 files changed, 8 insertions, 0 deletions

diff --git a/vespalib/src/vespa/vespalib/util/time.cpp b/vespalib/src/vespa/vespalib/util/time.cpp
index 341102bf9ff..a732eb215fb 100644
--- a/vespalib/src/vespa/vespalib/util/time.cpp
+++ b/vespalib/src/vespa/vespalib/util/time.cpp
@@ -2,7 +2,9 @@
 
 #include "time.h"
 #include <thread>
+#ifdef __x86_64__
 #include <immintrin.h>
+#endif
 
 namespace vespalib {
 
@@ -43,7 +45,13 @@ Timer::waitAtLeast(duration dur, bool busyWait) {
         steady_clock::time_point deadline = steady_clock::now() + dur;
         while (steady_clock::now() < deadline) {
             for (int i = 0; i < 1000; i++) {
+#if defined(__x86_64__)
                 _mm_pause();
+#elif defined(__aarch64__)
+                __asm__ __volatile__ ("yield");
+#else
+#warning "Missing yield"
+#endif
             }
         }
     } else {