Readd the arch ffz functions

[fio.git] / arch / arch-x86_64.h

diff --git a/arch/arch-x86_64.h b/arch/arch-x86_64.h
index b49fd5f1344625f559a67a2071dfde226be11b01..972c623a0bfcd90c043ec776158606e10b93cf60 100644 (file)
--- a/arch/arch-x86_64.h
+++ b/arch/arch-x86_64.h
@@ -32,4 +32,11 @@
 #define nop            __asm__ __volatile__("rep;nop": : :"memory")
 #define read_barrier() asm volatile("lfence":::"memory")
 
+static inline unsigned long arch_ffz(unsigned long bitmask)
+{
+       __asm__("bsfq %1,%0" :"=r" (bitmask) :"r" (~bitmask));
+       return bitmask;
+}
+#define ARCH_HAVE_FFZ
+
 #endif