builtins.c (set_builtin_user_assembler_name): Also handle ffs if int is smaller than word.

	* builtins.c (set_builtin_user_assembler_name): Also handle
	ffs if int is smaller than word.

	* gcc.dg/builtin-ffs-1.c: New test.

From-SVN: r156646

gcc/ChangeLog

+2010-02-10  Jakub Jelinek  <jakub@redhat.com>
+
+	* builtins.c (set_builtin_user_assembler_name): Also handle
+	ffs if int is smaller than word.
+
 2010-02-09  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR middle-end/42973

gcc/builtins.c

@@ -13594,6 +13594,14 @@ set_builtin_user_assembler_name (tree decl, const char *asmspec)
     case BUILT_IN_ABORT:
       abort_libfunc = set_user_assembler_libfunc ("abort", asmspec);
       break;
+    case BUILT_IN_FFS:
+      if (INT_TYPE_SIZE < BITS_PER_WORD)
+	{
+	  set_user_assembler_libfunc ("ffs", asmspec);
+	  set_optab_libfunc (ffs_optab, mode_for_size (INT_TYPE_SIZE,
+						       MODE_INT, 0), "ffs");
+	}
+      break;
     default:
       break;
     }

gcc/fortran/ChangeLog

-2010-02-09 Jerry DeLisle <jvdelisle@gcc.gnu.org>
+2010-02-09  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR fortran/42999
 	* array.c (gfc_constant_ac): Do not prevent expansion of constructors

gcc/testsuite/ChangeLog

-2010-02-09 Jerry DeLisle <jvdelisle@gcc.gnu.org>
+2010-02-10  Jakub Jelinek  <jakub@redhat.com>
+
+	* gcc.dg/builtin-ffs-1.c: New test.
+
+2010-02-09  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR fortran/42999
 	* gfortran.dg/array_constructor_35.f90: New test.

gcc/testsuite/gcc.dg/builtin-ffs-1.c

+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+extern int ffs (int) __asm ("__GI_ffs") __attribute__ ((nothrow, const));
+
+int
+ffsll (long long int i)
+{
+  unsigned long long int x = i & -i;
+  
+  if (x <= 0xffffffff)
+    return ffs (i);
+  else
+    return 32 + ffs (i >> 32);
+}
+
+/* { dg-final { scan-assembler-not "\nffs\n|\nffs\[^a-zA-Z0-9_\]|\[^a-zA-Z0-9_\]ffs\n" } } */