* f95-lang.c (gfc_init_builtin_functions): Use vold_list_node.

	Create decls for __builtin_pow{,f}.
	* gfortran.h (PREFIX_LEN): Define.
	* trans-decl.c (gfor_fndecl_math_powi): Add.
	(gfor_fndecl_math_powf, gfor_fndecl_math_pow): Remove.
	(gfc_build_intrinsic_function_decls): Create decls for powi.
	* trans-expr.c (powi_table): Add.
	(gfc_conv_integer_power): Remove.
	(gfc_conv_powi): New function.
	(gfc_conv_cst_int_power): New function.
	(gfc_conv_power_op): Use new powi routines.
	* trans.h (struct gfc_powdecl_list): Add.
	(gfor_fndecl_math_powi): Add.
	(gfor_fndecl_math_powf, gfor_fndecl_math_pow): Remove.
testsuite/
	* gfortran.fortran-torture/execute/power.f90: Test constant integers.
libgfortran/
	* Makefile.am (i_pow_c): Set it. Add build rule.
	(gfor_built_src): Use it.
	(m4_files): add m4/pow.m4.
	* Makefile.in: Regenerate.
	* m4/pow.m4: New file.
	* generated/pow_*.c: Regenerate.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@82014 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 60 insertions, 0 deletions

diff --git a/libgfortran/generated/pow_r8_i8.c b/libgfortran/generated/pow_r8_i8.c
new file mode 100644
index 00000000000..7f75c82f79b
--- /dev/null
+++ b/libgfortran/generated/pow_r8_i8.c
@@ -0,0 +1,60 @@
+/* Support routines for the intrinsic power (**) operator.
+   Copyright 2004 Free Software Foundation, Inc.
+   Contributed by Paul Brook
+
+This file is part of the GNU Fortran 95 runtime library (libgfor).
+
+Libgfor is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+Ligbfor is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with libgfor; see the file COPYING.LIB.  If not,
+write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include "config.h"
+#include "libgfortran.h"
+
+/* Uuse Binary Method to calculate the powi. This is not an optimal but
+   a simple and reasonable arithmetic. See section 4.6.3, "Evaluation of
+   Powers" of Donald E. Knuth, "Seminumerical Algorithms", Vol. 2, "The Art
+   of Computer Programming", 3rd Edition, 1998.  */
+
+GFC_REAL_8
+prefix(pow_r8_i8) (GFC_REAL_8 a, GFC_INTEGER_8 b)
+{
+  GFC_REAL_8 pow, x;
+  GFC_INTEGER_8 n, u;
+  
+  n = b;
+  x = a;
+  pow = 1;
+  if (n != 0)
+    {
+      if (n < 0)
+	{
+
+	  n = -n;
+	  x = pow / x;
+	}
+      u = n;
+      for (;;)
+	{
+	  if (u & 1)
+	    pow *= x;
+	  u >>= 1;
+	  if (u)
+	    x *= x;
+	  else
+	    break;
+	}
+    }
+  return pow;
+}