Add CPU "pause" intrinsic for MSVC
diff --git a/configure.ac b/configure.ac
index 3ae468a..8adb6f7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -218,12 +218,22 @@
CPU_SPINWAIT=""
case "${host_cpu}" in
i686|x86_64)
- AC_CACHE_VAL([je_cv_pause],
- [JE_COMPILABLE([pause instruction], [],
- [[__asm__ volatile("pause"); return 0;]],
- [je_cv_pause])])
- if test "x${je_cv_pause}" = "xyes" ; then
- CPU_SPINWAIT='__asm__ volatile("pause")'
+ if test "x${je_cv_msvc}" = "xyes" ; then
+ AC_CACHE_VAL([je_cv_pause_msvc],
+ [JE_COMPILABLE([pause instruction MSVC], [],
+ [[_mm_pause(); return 0;]],
+ [je_cv_pause_msvc])])
+ if test "x${je_cv_pause_msvc}" = "xyes" ; then
+ CPU_SPINWAIT='_mm_pause()'
+ fi
+ else
+ AC_CACHE_VAL([je_cv_pause],
+ [JE_COMPILABLE([pause instruction], [],
+ [[__asm__ volatile("pause"); return 0;]],
+ [je_cv_pause])])
+ if test "x${je_cv_pause}" = "xyes" ; then
+ CPU_SPINWAIT='__asm__ volatile("pause")'
+ fi
fi
;;
powerpc)
