shaba/lvm2
1
0
Fork 0
mirror of git://sourceware.org/git/lvm2.git synced 2024-12-21 13:34:40 +03:00
Code Releases Activity

utils: add clzll

Browse Source 
Check for __builtin_clzll and add wrapper when missing.
This commit is contained in:
Zdenek Kabelac 2018-06-19 19:35:48 +02:00
parent 8215e3503d
commit 6c84a36b53
4 changed files with 62 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
configure vendored
View File

@ -6581,6 +6581,50 @@ fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_clzll" >&5
$as_echo_n "checking for __builtin_clzll... " >&6; }
if ${ax_cv_have___builtin_clzll+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
__builtin_clzll(0)
;
return 0;
}
_ACEOF
if ac_fn_c_try_link "$LINENO"; then :
ax_cv_have___builtin_clzll=yes
else
ax_cv_have___builtin_clzll=no
fi
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_have___builtin_clzll" >&5
$as_echo "$ax_cv_have___builtin_clzll" >&6; }
if test yes = $ax_cv_have___builtin_clzll; then :
cat >>confdefs.h <<_ACEOF
#define HAVE___BUILTIN_CLZLL 1
_ACEOF
fi
################################################################################
for ac_func in ftruncate gethostname getpagesize gettimeofday localtime_r \
memchr memset mkdir mkfifo munmap nl_langinfo realpath rmdir setenv \

1
configure.ac
View File

@ -140,6 +140,7 @@ AC_TYPE_UINT16_T
AC_TYPE_UINT32_T
AC_TYPE_UINT64_T
AX_GCC_BUILTIN([__builtin_clz])
AX_GCC_BUILTIN([__builtin_clzll])
################################################################################
dnl -- Check for functions

3
include/configure.h.in
View File

@ -528,6 +528,9 @@
/* Define to 1 if the system has the `__builtin_clz' built-in function */
#undef HAVE___BUILTIN_CLZ
/* Define to 1 if the system has the `__builtin_clzll' built-in function */
#undef HAVE___BUILTIN_CLZLL
/* Internalization package */
#undef INTL_PACKAGE

15
lib/misc/util.h
View File

@ -43,7 +43,7 @@
#ifdef HAVE___BUILTIN_CLZ
#define clz(x) __builtin_clz((x))
#else /* ifdef HAVE___BUILTIN_CLZ */
unsigned _dm_clz(unsigned x)
static unsigned _dm_clz(unsigned x)
{
int n;
@ -76,6 +76,19 @@ unsigned _dm_clz(unsigned x)
#define clz(x) _dm_clz((x))
#endif /* ifdef HAVE___BUILTIN_CLZ */
#ifdef HAVE___BUILTIN_CLZLL
#define clzll(x) __builtin_clzll((x))
#else /* ifdef HAVE___BUILTIN_CLZ */
static unsigned _dm_clzll(unsigned long long x)
{
if (x <= 0xffffffff)
return 32 + clz((unsigned) (x & 0xffffffff));
return clz(x >> 32);
}
#define clzll(x) _dm_clzll((x))
#endif /* ifdef HAVE___BUILTIN_CLZLL */
#define KERNEL_VERSION(major, minor, release) (((major) << 16) + ((minor) << 8) + (release))
/* Define some portable printing types */