Added units to check for __builtin_ctz() and __builtin_clz() support.

git-svn-id: svn://svn.code.sf.net/p/dist/code/trunk/dist@137 2592e710-e01b-42a5-8df0-11608a6cc53d

3 files changed, 76 insertions, 0 deletions

diff --git a/MANIFEST b/MANIFEST
index e659f18..4f85e49 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -172,6 +172,8 @@ mcon/U/d_bcopy.U           Do we have bcopy() or memcpy()?
 mcon/U/d_bindtxtcode.U     Do we have bind_textdomain_codeset()?
 mcon/U/d_brokstat.U        Check whether stat() macros are broken
 mcon/U/d_bsdjmp.U          Do we have BSD _setjmp() and _longjmp()?
+mcon/U/d_built_clz.U       Is __builtin_clz() available?
+mcon/U/d_built_ctz.U       Is __builtin_ctz() available?
 mcon/U/d_built_memcmp.U    Is __builtin_memcmp() available?
 mcon/U/d_built_popcount.U  Is __builtin_popcount() available?
 mcon/U/d_byacc.U           Is byacc available?
diff --git a/mcon/U/d_built_clz.U b/mcon/U/d_built_clz.U
new file mode 100644
index 0000000..8af83ce
--- /dev/null
+++ b/mcon/U/d_built_clz.U
@@ -0,0 +1,37 @@
+?RCS: $Id$
+?RCS:
+?RCS: Copyright (c) 2012 Raphael Manfredi
+?RCS:
+?RCS: You may redistribute only under the terms of the Artistic Licence,
+?RCS: as specified in the README file that comes with the distribution.
+?RCS: You may reuse parts of this distribution only within the terms of
+?RCS: that same Artistic Licence; a copy of which may be found at the root
+?RCS: of the source tree for dist 4.0.
+?RCS:
+?MAKE:d_built_clz: Trylink cat
+?MAKE:	-pick add $@ %<
+?S:d_built_clz:
+?S:	This variable conditionally defines the HAS_BUILTIN_CLZ symbol, which
+?S:	indicates to the C program that __builtin_clz is available to count
+?S:	leading zeroes.
+?S:.
+?C:HAS_BUILTIN_CLZ:
+?C:	This symbol, if defined, indicates that the __builtin_clz routine is
+?C:	available to count leading zeroes in a word.
+?C:.
+?H:#$d_built_clz HAS_BUILTIN_CLZ	/**/
+?H:.
+?LINT:set d_built_clz
+: check for __builtin_clz
+$cat >try.c <<EOC
+int main(void)
+{
+	static int ret;
+	ret |= __builtin_clz(127);
+	return ret ? 0 : 1;
+}
+EOC
+cyn=__builtin_clz
+set d_built_clz
+eval $trylink
+
diff --git a/mcon/U/d_built_ctz.U b/mcon/U/d_built_ctz.U
new file mode 100644
index 0000000..279d50f
--- /dev/null
+++ b/mcon/U/d_built_ctz.U
@@ -0,0 +1,37 @@
+?RCS: $Id$
+?RCS:
+?RCS: Copyright (c) 2012 Raphael Manfredi
+?RCS:
+?RCS: You may redistribute only under the terms of the Artistic Licence,
+?RCS: as specified in the README file that comes with the distribution.
+?RCS: You may reuse parts of this distribution only within the terms of
+?RCS: that same Artistic Licence; a copy of which may be found at the root
+?RCS: of the source tree for dist 4.0.
+?RCS:
+?MAKE:d_built_ctz: Trylink cat
+?MAKE:	-pick add $@ %<
+?S:d_built_ctz:
+?S:	This variable conditionally defines the HAS_BUILTIN_CTZ symbol, which
+?S:	indicates to the C program that __builtin_ctz is available to count
+?S:	trailing zeroes.
+?S:.
+?C:HAS_BUILTIN_CTZ:
+?C:	This symbol, if defined, indicates that __builtin_ctz routine is
+?C:	available to count trailing zeroes in a word.
+?C:.
+?H:#$d_built_ctz HAS_BUILTIN_CTZ	/**/
+?H:.
+?LINT:set d_built_ctz
+: check for __builtin_ctz
+$cat >try.c <<EOC
+int main(void)
+{
+	static int ret;
+	ret |= __builtin_ctz(127);
+	return ret ? 0 : 1;
+}
+EOC
+cyn=__builtin_ctz
+set d_built_ctz
+eval $trylink
+