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| author | alc <alc@FreeBSD.org> | 2012-06-30 20:25:12 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2012-06-30 20:25:12 +0000 |
| commit | aacced50dfd757da308a405f8141fc798d81875c (patch) | |
| tree | 9f8ce64a88610ed127c66c973aec935eb8cd5103 /sys/amd64/include | |
| parent | c61cad51adaa3f4b9963cd8910e2c5d7471dd524 (diff) | |
| download | FreeBSD-src-aacced50dfd757da308a405f8141fc798d81875c.zip FreeBSD-src-aacced50dfd757da308a405f8141fc798d81875c.tar.gz | |
Optimize reserve_pv_entries() using the popcnt instruction.
Diffstat (limited to 'sys/amd64/include')
| -rw-r--r-- | sys/amd64/include/cpufunc.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/sys/amd64/include/cpufunc.h b/sys/amd64/include/cpufunc.h index 9440694..927d00f 100644 --- a/sys/amd64/include/cpufunc.h +++ b/sys/amd64/include/cpufunc.h @@ -273,6 +273,15 @@ outw(u_int port, u_short data) __asm __volatile("outw %0, %w1" : : "a" (data), "Nd" (port)); } +static __inline u_long +popcntq(u_long mask) +{ + u_long result; + + __asm __volatile("popcntq %1,%0" : "=r" (result) : "rm" (mask)); + return (result); +} + static __inline void mfence(void) { |
