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From: Christian Kastner <ckk@debian.org>
Date: Fri, 18 Oct 2024 20:24:16 +0200
Subject: On non-x86, use alternative to x86 intrinsic __mm_pause
Cargo-culted from various other solutions that I could find.
Not forwarded yet, as this needs double-checking. For example, on my
first pass, I overlooked that this might also be built by MSVC.
---
runtime/hsa-runtime/core/util/locks.h | 6 ++++++
1 file changed, 6 insertions(+)
--- a/runtime/hsa-runtime/core/util/locks.h
+++ b/runtime/hsa-runtime/core/util/locks.h
@@ -72,7 +72,13 @@
while (!lock_.compare_exchange_strong(old, 1)) {
cnt--;
if (cnt > maxSpinIterPause) {
+#if defined(__x86_64__) || defined(_M_X64)
_mm_pause();
+#elif defined(__aarch64__) || defined(_M_ARM64)
+ asm volatile("isb");
+#elif defined(__ppc__) || defined(__powerpc__) || defined(__powerpc64__)
+ asm volatile("or 27, 27, 27");
+#endif
} else if (cnt-- > maxSpinIterYield) {
os::YieldThread();
} else {
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