eoshift2.c (eoshift2): Use memcpy for innermost copy where possible.

2017-06-09  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* intrinsics/eoshift2.c (eoshift2):  Use memcpy
	for innermost copy where possible.
	* m4/eoshift1.m4 (eoshift1): Likewise.
	* m4/eoshift3.m4 (eoshift3): Likewise.
	* generated/eoshift1_16.c: Regenerated.
	* generated/eoshift1_4.c: Regenerated.
	* generated/eoshift1_8.c: Regenerated.
	* generated/eoshift3_16.c: Regenerated.
	* generated/eoshift3_4.c: Regenerated.
	* generated/eoshift3_8.c: Regenerated.

2017-06-09  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* gfortran.dg/eoshift_4.f90:  New test.
	* gfortran.dg/eoshift_5.f90:  New test.
	* gfortran.dg/eoshift_6.f90:  New test.

From-SVN: r250085

1 files changed, 17 insertions, 6 deletions

diff --git a/libgfortran/generated/eoshift1_4.c b/libgfortran/generated/eoshift1_4.c
index 1be49325895..a90fc2176de 100644
--- a/libgfortran/generated/eoshift1_4.c
+++ b/libgfortran/generated/eoshift1_4.c
@@ -183,12 +183,23 @@ eoshift1 (gfc_array_char * const restrict ret,
           src = sptr;
           dest = &rptr[delta * roffset];
         }
-      for (n = 0; n < len - delta; n++)
-        {
-          memcpy (dest, src, size);
-          dest += roffset;
-          src += soffset;
-        }
+
+      /* If the elements are contiguous, perform a single block move.  */
+      if (soffset == size && roffset == size)
+	{
+	  size_t chunk = size * (len - delta);
+	  memcpy (dest, src, chunk);
+	  dest += chunk;
+	}
+      else
+	{
+	  for (n = 0; n < len - delta; n++)
+	    {
+	      memcpy (dest, src, size);
+	      dest += roffset;
+	      src += soffset;
+	    }
+	}
       if (sh < 0)
         dest = rptr;
       n = delta;