* 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.

From-SVN: r82014