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Determine rtree levels at compile time.

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Rather than dynamically building a table to aid per level computations,
define a constant table at compile time.  Omit both high and low
insignificant bits.  Use one to three tree levels, depending on the
number of significant bits.
This commit is contained in:
Jason Evans
2017-02-06 13:17:12 -08:00
parent ff4db5014e
commit f5cf9b19c8
9 changed files with 244 additions and 268 deletions
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68
configure.ac
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@@ -406,6 +406,74 @@ case "${host_cpu}" in
esac
AC_DEFINE_UNQUOTED([CPU_SPINWAIT], [$CPU_SPINWAIT])
case "${host_cpu}" in
aarch64)
AC_MSG_CHECKING([number of significant virtual address bits])
LG_VADDR=48
AC_MSG_RESULT([$LG_VADDR])
;;
x86_64)
AC_CACHE_CHECK([number of significant virtual address bits],
[je_cv_lg_vaddr],
AC_RUN_IFELSE([AC_LANG_PROGRAM(
[[
#include <stdio.h>
#ifdef _WIN32
#include <limits.h>
#include <intrin.h>
typedef unsigned __int32 uint32_t;
#else
#include <stdint.h>
#endif
]], [[
uint32_t r[[4]];
uint32_t eax_in = 0x80000008U;
#ifdef _WIN32
__cpuid((int *)r, (int)eax_in);
#else
asm volatile ("cpuid"
: "=a" (r[[0]]), "=b" (r[[1]]), "=c" (r[[2]]), "=d" (r[[3]])
: "a" (eax_in), "c" (0)
);
#endif
uint32_t eax_out = r[[0]];
uint32_t vaddr = ((eax_out & 0x0000ff00U) >> 8);
FILE *f = fopen("conftest.out", "w");
if (f == NULL) {
return 1;
}
fprintf(f, "%u", vaddr);
fclose(f);
return 0;
]])],
[je_cv_lg_vaddr=`cat conftest.out`],
[je_cv_lg_vaddr=error],
[je_cv_lg_vaddr=57]))
if test "x${je_cv_lg_vaddr}" != "x" ; then
LG_VADDR="${je_cv_lg_vaddr}"
fi
if test "x${LG_VADDR}" != "xerror" ; then
AC_DEFINE_UNQUOTED([LG_VADDR], [$LG_VADDR])
else
AC_MSG_ERROR([cannot determine number of significant virtual address bits])
fi
;;
*)
AC_MSG_CHECKING([number of significant virtual address bits])
if test "x${LG_SIZEOF_PTR}" = "x3" ; then
LG_VADDR=64
elif test "x${LG_SIZEOF_PTR}" = "x2" ; then
LG_VADDR=32
elif test "x${LG_SIZEOF_PTR}" = "xLG_SIZEOF_PTR_WIN" ; then
LG_VADDR="(1U << (LG_SIZEOF_PTR_WIN+3))"
else
AC_MSG_ERROR([Unsupported lg(pointer size): ${LG_SIZEOF_PTR}])
fi
AC_MSG_RESULT([$LG_VADDR])
;;
esac
AC_DEFINE_UNQUOTED([LG_VADDR], [$LG_VADDR])
LD_PRELOAD_VAR="LD_PRELOAD"
so="so"
importlib="${so}"