x86-64: ffz need only search the first 32-bits

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

diff --git a/arch/arch-x86_64.h b/arch/arch-x86_64.h
index 972c623a0bfcd90c043ec776158606e10b93cf60..a8f075a00a5656079f0a5107accad2eff34c0cd0 100644 (file)
--- a/arch/arch-x86_64.h
+++ b/arch/arch-x86_64.h
@@ -32,11 +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)
+static inline unsigned int arch_ffz(unsigned int bitmask)
 {
-       __asm__("bsfq %1,%0" :"=r" (bitmask) :"r" (~bitmask));
+       __asm__("bsfl %1,%0" :"=r" (bitmask) :"r" (~bitmask));
        return bitmask;
 }
-#define ARCH_HAVE_FFZ
+//#define ARCH_HAVE_FFZ
 
 #endif