Henri Verbeet : wined3d: Use __builtin_clz() in wined3d_log2i() when available.
Alexandre Julliard
julliard at wine.codeweavers.com
Wed Dec 10 15:34:08 CST 2014
Module: wine
Branch: master
Commit: f5939399f04ac96b71fae16413241d38d032ff10
URL: http://source.winehq.org/git/wine.git/?a=commit;h=f5939399f04ac96b71fae16413241d38d032ff10
Author: Henri Verbeet <hverbeet at codeweavers.com>
Date: Wed Dec 10 13:26:34 2014 +0100
wined3d: Use __builtin_clz() in wined3d_log2i() when available.
---
configure | 33 +++++++++++++++++++++++++++++++++
configure.ac | 9 +++++++++
dlls/wined3d/utils.c | 5 +++++
include/config.h.in | 3 +++
4 files changed, 50 insertions(+)
diff --git a/configure b/configure
index 2677e43..e679696 100755
--- a/configure
+++ b/configure
@@ -16448,6 +16448,39 @@ done
LIBS="$ac_save_LIBS"
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_clz" >&5
+$as_echo_n "checking for __builtin_clz... " >&6; }
+if ${ac_cv_have___builtin_clz+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+int
+main ()
+{
+return __builtin_clz(1)
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+ ac_cv_have___builtin_clz="yes"
+else
+ ac_cv_have___builtin_clz="no"
+fi
+rm -f core conftest.err conftest.$ac_objext \
+ conftest$ac_exeext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_have___builtin_clz" >&5
+$as_echo "$ac_cv_have___builtin_clz" >&6; }
+if test "$ac_cv_have___builtin_clz" = "yes"
+then
+
+$as_echo "#define HAVE___BUILTIN_CLZ 1" >>confdefs.h
+
+fi
+
case $host_cpu in
*i[3456789]86*) { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we need to define __i386__" >&5
diff --git a/configure.ac b/configure.ac
index 8110995..6f4e719 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2595,6 +2595,15 @@ AC_CHECK_FUNCS(\
)
LIBS="$ac_save_LIBS"
+dnl Check for __builtin_clz
+AC_CACHE_CHECK([for __builtin_clz], ac_cv_have___builtin_clz,
+ AC_LINK_IFELSE([AC_LANG_PROGRAM(,[[return __builtin_clz(1)]])],
+ [ac_cv_have___builtin_clz="yes"], [ac_cv_have___builtin_clz="no"]))
+if test "$ac_cv_have___builtin_clz" = "yes"
+then
+ AC_DEFINE(HAVE___BUILTIN_CLZ, 1, [Define to 1 if you have the `__builtin_clz' built-in function.])
+fi
+
dnl *** check for the need to define platform-specific symbols
case $host_cpu in
diff --git a/dlls/wined3d/utils.c b/dlls/wined3d/utils.c
index d3fb1d6..566d921 100644
--- a/dlls/wined3d/utils.c
+++ b/dlls/wined3d/utils.c
@@ -3929,8 +3929,12 @@ const struct wine_rb_functions wined3d_ffp_vertex_program_rb_functions =
wined3d_ffp_vertex_program_key_compare,
};
+/* Return the integer base-2 logarithm of x. Undefined for x == 0. */
UINT wined3d_log2i(UINT32 x)
{
+#ifdef HAVE___BUILTIN_CLZ
+ return __builtin_clz(x) ^ 0x1f;
+#else
static const UINT l[] =
{
~0U, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
@@ -3953,6 +3957,7 @@ UINT wined3d_log2i(UINT32 x)
UINT32 i;
return (i = x >> 16) ? (x = i >> 8) ? l[x] + 24 : l[i] + 16 : (i = x >> 8) ? l[i] + 8 : l[x];
+#endif
}
const struct blit_shader *wined3d_select_blitter(const struct wined3d_gl_info *gl_info, enum wined3d_blit_op blit_op,
diff --git a/include/config.h.in b/include/config.h.in
index 0370c6d..a8ae6c5 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -1281,6 +1281,9 @@
/* Define to 1 if you have the `_vsnprintf' function. */
#undef HAVE__VSNPRINTF
+/* Define to 1 if you have the `__builtin_clz' built-in function. */
+#undef HAVE___BUILTIN_CLZ
+
/* Define to 1 if you have the `__res_getservers' function. */
#undef HAVE___RES_GETSERVERS
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