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From: Michael R. Crusoe <crusoe@debian.org>
Subject: Add portable pauses
Forwarded: https://github.com/COMBINE-lab/RapMap/pull/49
--- a/include/FastxParserThreadUtils.hpp
+++ b/include/FastxParserThreadUtils.hpp
@@ -6,6 +6,9 @@
#include <chrono>
#include <random>
#include <pthread.h>
+#if defined(__SSE2__)
+#include <xmmintrin.h> // _mm_pause
+#endif
// Most of this code is taken directly from https://github.com/geidav/spinlocks-bench/blob/master/os.hpp.
// However, things may be renamed, modified, or randomly mangled over time.
@@ -18,7 +21,23 @@ namespace fastx_parser {
static const size_t MAX_BACKOFF_ITERS = 1024;
ALWAYS_INLINE static void cpuRelax() {
- asm("pause");
+ #if defined(__SSE2__) // AMD and Intel
+ _mm_pause();
+ #elif defined(__i386__) || defined(__x86_64__)
+ asm volatile("pause");
+ #elif defined(__aarch64__)
+ asm volatile("wfe");
+ #elif defined(__armel__) || defined(__ARMEL__)
+ asm volatile ("nop" ::: "memory");
+ #elif defined(__arm__) || defined(__aarch64__)
+ __asm__ __volatile__ ("yield" ::: "memory");
+ #elif defined(__ia64__) // IA64
+ __asm__ __volatile__ ("hint @pause");
+ #elif defined(__powerpc__) || defined(__ppc__) || defined(__PPC__)
+ __asm__ __volatile__ ("or 27,27,27" ::: "memory");
+ #else // everything else.
+ asm volatile ("nop" ::: "memory");
+ #endif
}
ALWAYS_INLINE void yieldSleep() {
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