gcc/fortran/ChangeLog:
* arith.cc (arith_power): Handle modular arithmetic for
BT_UNSIGNED.
(eval_intrinsic): Error for unsigned exponentiation with
-pedantic.
* expr.cc (gfc_type_convert_binary): Use type of first
argument for unsigned exponentiation.
* gfortran.texi: Mention arithmetic exponentiation.
* resolve.cc (resolve_operator): Allow unsigned exponentiation.
* trans-decl.cc (gfc_build_intrinsic_function_decls): Build
declarations for unsigned exponentiation.
* trans-expr.cc (gfc_conv_cst_uint_power): New function.
(gfc_conv_power_op): Call it. Handle unsigned exponentiation.
* trans.h (gfor_fndecl_unsigned_pow_list): Add declaration.
libgfortran/ChangeLog:
* Makefile.am: Add files for unsigned exponentiation.
* Makefile.in: Regenerate.
* gfortran.map: Add functions for unsigned exponentiation.
* generated/pow_m16_m1.c: New file.
* generated/pow_m16_m16.c: New file.
* generated/pow_m16_m2.c: New file.
* generated/pow_m16_m4.c: New file.
* generated/pow_m16_m8.c: New file.
* generated/pow_m1_m1.c: New file.
* generated/pow_m1_m16.c: New file.
* generated/pow_m1_m2.c: New file.
* generated/pow_m1_m4.c: New file.
* generated/pow_m1_m8.c: New file.
* generated/pow_m2_m1.c: New file.
* generated/pow_m2_m16.c: New file.
* generated/pow_m2_m2.c: New file.
* generated/pow_m2_m4.c: New file.
* generated/pow_m2_m8.c: New file.
* generated/pow_m4_m1.c: New file.
* generated/pow_m4_m16.c: New file.
* generated/pow_m4_m2.c: New file.
* generated/pow_m4_m4.c: New file.
* generated/pow_m4_m8.c: New file.
* generated/pow_m8_m1.c: New file.
* generated/pow_m8_m16.c: New file.
* generated/pow_m8_m2.c: New file.
* generated/pow_m8_m4.c: New file.
* generated/pow_m8_m8.c: New file.
* m4/powu.m4: New file.
gcc/testsuite/ChangeLog:
* gfortran.dg/unsigned_15.f90: Adjust error messages.
* gfortran.dg/unsigned_43.f90: New test.
* gfortran.dg/unsigned_44.f90: New test.
c2a0ee5886