/* Helper function for cshift functions.
- Copyright 2008, 2009 Free Software Foundation, Inc.
+ Copyright (C) 2008-2013 Free Software Foundation, Inc.
Contributed by Thomas Koenig <tkoenig@gcc.gnu.org>
-This file is part of the GNU Fortran 95 runtime library (libgfortran).
+This file is part of the GNU Fortran runtime library (libgfortran).
Libgfortran is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
dim = GFC_DESCRIPTOR_RANK (array);
rstride0 = rstride[0];
sstride0 = sstride[0];
- rptr = ret->data;
- sptr = array->data;
+ rptr = ret->base_addr;
+ sptr = array->base_addr;
- shift = len == 0 ? 0 : shift % (ptrdiff_t)len;
- if (shift < 0)
- shift += len;
+ /* Avoid the costly modulo for trivially in-bound shifts. */
+ if (shift < 0 || shift >= len)
+ {
+ shift = len == 0 ? 0 : shift % (ptrdiff_t)len;
+ if (shift < 0)
+ shift += len;
+ }
while (rptr)
{