As discussed with DaveM, this duplicates libitm's cpu_relax into libgomp.
Tested on SPARC64/Linux, applied on the mainline.
2012-02-29 Eric Botcazou <[email protected]>
* config/linux/sparc/futex.h (cpu_relax): Read from CC register.
--
Eric Botcazou
Index: config/linux/sparc/futex.h
===================================================================
--- config/linux/sparc/futex.h (revision 184585)
+++ config/linux/sparc/futex.h (working copy)
@@ -90,9 +90,5 @@ futex_wake (int *addr, int count)
static inline void
cpu_relax (void)
{
-#if defined __arch64__ || defined __sparc_v9__
- __asm volatile ("membar #LoadLoad" : : : "memory");
-#else
- __asm volatile ("" : : : "memory");
-#endif
+ __asm volatile ("rd %%ccr, %%g0" : : : "memory");
}
