* sysdeps/unix/sysv/linux/bits/sched.h (__CPU_ZERO_S): Optimize

	using gcc builtin.
	(__CPU_EQUAL_S): Likewise.

diff --git a/ChangeLog b/ChangeLog
index 59fbdab..f875458 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2007-07-29  Ulrich Drepper  <drepper@redhat.com>
 
+       * sysdeps/unix/sysv/linux/bits/sched.h (__CPU_ZERO_S): Optimize
+       using gcc builtin.
+       (__CPU_EQUAL_S): Likewise.
+
        * posix/Makefile (routines): Add sched_cpualloc and sched_cpufree.
        (tests): Add tst-cpuset.
        * posix/sched_cpualloc.c: New file.

diff --git a/sysdeps/unix/sysv/linux/bits/sched.h b/sysdeps/unix/sysv/linux/bits/sched.h
index b19822c..5eaa2fe 100644 (file)
--- a/sysdeps/unix/sysv/linux/bits/sched.h
+++ b/sysdeps/unix/sysv/linux/bits/sched.h
@@ -104,7 +104,7 @@ struct __sched_param
 # define __CPU_SETSIZE 1024
 # define __NCPUBITS    (8 * sizeof (__cpu_mask))
 
-/* Type for array elements in 'cpu_set'.  */
+/* Type for array elements in 'cpu_set_t'.  */
 typedef unsigned long int __cpu_mask;
 
 /* Basic access functions.  */
@@ -118,7 +118,11 @@ typedef struct
 } cpu_set_t;
 
 /* Access functions for CPU masks.  */
-# define __CPU_ZERO_S(setsize, cpusetp) \
+# if __GNUC_PREREQ (2, 91)
+#  define __CPU_ZERO_S(setsize, cpusetp) \
+  do __builtin_memset (cpusetp, '\0', setsize); while (0)
+# else
+#  define __CPU_ZERO_S(setsize, cpusetp) \
   do {                                                                       \
     size_t __i;                                                                      \
     size_t __imax = (setsize) / sizeof (__cpu_mask);                         \
@@ -126,6 +130,7 @@ typedef struct
     for (__i = 0; __i < __imax; ++__i)                                       \
       __arr->__bits[__i] = 0;                                                \
   } while (0)
+# endif
 # define __CPU_SET_S(cpu, setsize, cpusetp) \
   ({ size_t __cpu = (cpu);                                                   \
      __cpu < 8 * (setsize)                                                   \
@@ -142,7 +147,11 @@ typedef struct
 # define __CPU_COUNT_S(setsize, cpusetp) \
   __sched_cpucount (setsize, cpusetp)
 
-# define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
+# if __GNUC_PREREQ (2, 91)
+#  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
+  (__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0)
+# else
+#  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
   ({ cpu_set_t *__arr1 = (cpusetp1);                                         \
      cpu_set_t *__arr2 = (cpusetp2);                                         \
      size_t __imax = (setsize) / sizeof (__cpu_mask);                        \
@@ -151,6 +160,7 @@ typedef struct
        if (__arr1->__bits[__i] != __arr2->__bits[__i])                       \
         break;                                                               \
      __i == __imax; })
+# endif
 
 # define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \
   ({ cpu_set_t *__dest = (destset);                                          \