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Add size class computation capability.

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Add size class computation capability, currently used only as validation
of the size class lookup tables.  Generalize the size class spacing used
for bins, for eventual use throughout the full range of allocation
sizes.
This commit is contained in:
Jason Evans 2014-05-28 16:11:55 -07:00
parent 99118622ff
commit d04047cc29
9 changed files with 462 additions and 91 deletions
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23
configure.ac
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@ -1200,6 +1200,29 @@ if test "x${je_cv_atomic9}" != "xyes" -a "x${je_cv_osatomic}" != "xyes" ; then
JE_SYNC_COMPARE_AND_SWAP_CHECK(64, 8)
fi
dnl ============================================================================
dnl Check for __builtin_clz() and __builtin_clzl().
AC_CACHE_CHECK([for __builtin_clz],
[je_cv_builtin_clz],
[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
[
{
unsigned x = 0;
int y = __builtin_clz(x);
}
{
unsigned long x = 0;
int y = __builtin_clzl(x);
}
])],
[je_cv_builtin_clz=yes],
[je_cv_builtin_clz=no])])
if test "x${je_cv_builtin_clz}" = "xyes" ; then
AC_DEFINE([JEMALLOC_HAVE_BUILTIN_CLZ], [ ])
fi
dnl ============================================================================
dnl Check for spinlock(3) operations as provided on Darwin.