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Roughly equivalent to upstream 5f7cda29add367c5381775a314ec9f90e311457a.
--- a/boost/fiber/detail/cpu_relax.hpp
+++ b/boost/fiber/detail/cpu_relax.hpp
@@ -47,7 +47,7 @@ namespace detail {
# else
# define cpu_relax() asm volatile ("nop" ::: "memory");
# endif
-#elif BOOST_ARCH_MIPS
+#elif BOOST_ARCH_MIPS && (__mips_isa_rev > 1)
# define cpu_relax() asm volatile ("pause" ::: "memory");
#elif BOOST_ARCH_PPC
// http://code.metager.de/source/xref/gnu/glibc/sysdeps/powerpc/sys/platform/ppc.h
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