Use pointer sized array indices.

Using pointer sized variables (e.g. size_t / ptrdiff_t) when the
variables are used as array indices allows accessing larger arrays,
and can be a slight performance improvement due to no need for sign or
zero extending, or masking.

Regtested on x86_64-pc-linux-gnu.

libgfortran/ChangeLog:

2018-01-31  Janne Blomqvist  <jb@gcc.gnu.org>

	* generated/cshift1_16.c (cshift1): Regenerated.
	* generated/cshift1_4.c (cshift1): Regenerated.
	* generated/cshift1_8.c (cshift1): Regenerated.
	* generated/eoshift1_16.c (eoshift1): Regenerated.
	* generated/eoshift1_4.c (eoshift1): Regenerated.
	* generated/eoshift1_8.c (eoshift1): Regenerated.
	* generated/eoshift3_16.c (eoshift3): Regenerated.
	* generated/eoshift3_4.c (eoshift3): Regenerated.
	* generated/eoshift3_8.c (eoshift3): Regenerated.
	* generated/in_pack_c10.c (internal_pack_c10): Regenerated.
	* generated/in_pack_c16.c (internal_pack_c16): Regenerated.
	* generated/in_pack_c4.c (internal_pack_c4): Regenerated.
	* generated/in_pack_c8.c (internal_pack_c8): Regenerated.
	* generated/in_pack_i1.c (internal_pack_1): Regenerated.
	* generated/in_pack_i16.c (internal_pack_16): Regenerated.
	* generated/in_pack_i2.c (internal_pack_2): Regenerated.
	* generated/in_pack_i4.c (internal_pack_4): Regenerated.
	* generated/in_pack_i8.c (internal_pack_8): Regenerated.
	* generated/in_pack_r10.c (internal_pack_r10): Regenerated.
	* generated/in_pack_r16.c (internal_pack_r16): Regenerated.
	* generated/in_pack_r4.c (internal_pack_r4): Regenerated.
	* generated/in_pack_r8.c (internal_pack_r8): Regenerated.
	* generated/in_unpack_c10.c (internal_unpack_c10): Regenerated.
	* generated/in_unpack_c16.c (internal_unpack_c16): Regenerated.
	* generated/in_unpack_c4.c (internal_unpack_c4): Regenerated.
	* generated/in_unpack_c8.c (internal_unpack_c8): Regenerated.
	* generated/in_unpack_i1.c (internal_unpack_1): Regenerated.
	* generated/in_unpack_i16.c (internal_unpack_16): Regenerated.
	* generated/in_unpack_i2.c (internal_unpack_2): Regenerated.
	* generated/in_unpack_i4.c (internal_unpack_4): Regenerated.
	* generated/in_unpack_i8.c (internal_unpack_8): Regenerated.
	* generated/in_unpack_r10.c (internal_unpack_r10): Regenerated.
	* generated/in_unpack_r16.c (internal_unpack_r16): Regenerated.
	* generated/in_unpack_r4.c (internal_unpack_r4): Regenerated.
	* generated/in_unpack_r8.c (internal_unpack_r8): Regenerated.
	* generated/reshape_c10.c (reshape_c10): Regenerated.
	* generated/reshape_c16.c (reshape_c16): Regenerated.
	* generated/reshape_c4.c (reshape_c4): Regenerated.
	* generated/reshape_c8.c (reshape_c8): Regenerated.
	* generated/reshape_i16.c (reshape_16): Regenerated.
	* generated/reshape_i4.c (reshape_4): Regenerated.
	* generated/reshape_i8.c (reshape_8): Regenerated.
	* generated/reshape_r10.c (reshape_r10): Regenerated.
	* generated/reshape_r16.c (reshape_r16): Regenerated.
	* generated/reshape_r4.c (reshape_r4): Regenerated.
	* generated/reshape_r8.c (reshape_r8): Regenerated.
	* generated/shape_i1.c (shape_1): Regenerated.
	* generated/shape_i16.c (shape_16): Regenerated.
	* generated/shape_i2.c (shape_2): Regenerated.
	* generated/shape_i4.c (shape_4): Regenerated.
	* generated/shape_i8.c (shape_8): Regenerated.
	* generated/spread_c10.c (spread_scalar_c10): Regenerated.
	* generated/spread_c16.c (spread_scalar_c16): Regenerated.
	* generated/spread_c4.c (spread_scalar_c4): Regenerated.
	* generated/spread_c8.c (spread_scalar_c8): Regenerated.
	* generated/spread_i1.c (spread_scalar_i1): Regenerated.
	* generated/spread_i16.c (spread_scalar_i16): Regenerated.
	* generated/spread_i2.c (spread_scalar_i2): Regenerated.
	* generated/spread_i4.c (spread_scalar_i4): Regenerated.
	* generated/spread_i8.c (spread_scalar_i8): Regenerated.
	* generated/spread_r10.c (spread_scalar_r10): Regenerated.
	* generated/spread_r16.c (spread_scalar_r16): Regenerated.
	* generated/spread_r4.c (spread_scalar_r4): Regenerated.
	* generated/spread_r8.c (spread_scalar_r8): Regenerated.
	* intrinsics/random.c (jump): Use size_t for array index in loop.
	(getosrandom): Likewise.
	(arandom_r4): Make n an index_type.
	(arandom_r8): Likewise.
	(arandom_r10): Likewise.
	(arandom_r16): Likewise.
	(scramble_seed): Use size_t for array index in loop.
	* m4/cshift1.m4: Make i an index_type.
	* m4/eoshift1.m4: Likewise.
	* m4/eoshift3.m4: Likewise.
	* m4/in_pack.m4: Make n an index_type.
	* m4/in_unpack.m4: Likewise.
	* m4/reshape.m4: Make n and dim index_type's.
	* m4/shape.m4: Make n an index_type.
	* m4/spread.m4: Likewise, use index_type argument rather than
	copying to int.
	* runtime/bounds.c (bounds_ifunction_return): Make n an
	index_type.
	* runtime/in_pack_generic.c (internal_pack): Likewise.
	* runtime/in_unpack_generic.c (internal_unpack): Make n and size
	index_type's.

From-SVN: r257234

8 files changed, 24 insertions, 37 deletions

diff --git a/libgfortran/m4/cshift1.m4 b/libgfortran/m4/cshift1.m4
index bf1c7478404..504d4d00bc7 100644
--- a/libgfortran/m4/cshift1.m4
+++ b/libgfortran/m4/cshift1.m4
@@ -78,12 +78,10 @@ cshift1 (gfc_array_char * const restrict ret,
 
   if (ret->base_addr == NULL)
     {
-      int i;
-
       ret->base_addr = xmallocarray (arraysize, size);
       ret->offset = 0;
       GFC_DTYPE_COPY(ret,array);
-      for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
+      for (index_type i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
         {
 	  index_type ub, str;
 
diff --git a/libgfortran/m4/eoshift1.m4 b/libgfortran/m4/eoshift1.m4
index aab46fd08a5..ab3f6ce6a19 100644
--- a/libgfortran/m4/eoshift1.m4
+++ b/libgfortran/m4/eoshift1.m4
@@ -85,11 +85,9 @@ eoshift1 (gfc_array_char * const restrict ret,
   arraysize = size0 ((array_t *) array);
   if (ret->base_addr == NULL)
     {
-      int i;
-
       ret->offset = 0;
       GFC_DTYPE_COPY(ret,array);
-      for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
+      for (index_type i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
         {
 	  index_type ub, str;
 
diff --git a/libgfortran/m4/eoshift3.m4 b/libgfortran/m4/eoshift3.m4
index a8077496760..504cc7ba93a 100644
--- a/libgfortran/m4/eoshift3.m4
+++ b/libgfortran/m4/eoshift3.m4
@@ -86,12 +86,10 @@ eoshift3 (gfc_array_char * const restrict ret,
 
   if (ret->base_addr == NULL)
     {
-      int i;
-
       ret->base_addr = xmallocarray (arraysize, size);
       ret->offset = 0;
       GFC_DTYPE_COPY(ret,array);
-      for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
+      for (index_type i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
         {
 	  index_type ub, str;
 
diff --git a/libgfortran/m4/in_pack.m4 b/libgfortran/m4/in_pack.m4
index 5da0a87a571..2dce24bc03f 100644
--- a/libgfortran/m4/in_pack.m4
+++ b/libgfortran/m4/in_pack.m4
@@ -46,7 +46,6 @@ internal_pack_'rtype_ccode` ('rtype` * source)
   const 'rtype_name` *src;
   'rtype_name` * restrict dest;
   'rtype_name` *destptr;
-  int n;
   int packed;
 
   /* TODO: Investigate how we can figure out if this is a temporary
@@ -55,7 +54,7 @@ internal_pack_'rtype_ccode` ('rtype` * source)
   dim = GFC_DESCRIPTOR_RANK (source);
   ssize = 1;
   packed = 1;
-  for (n = 0; n < dim; n++)
+  for (index_type n = 0; n < dim; n++)
     {
       count[n] = 0;
       stride[n] = GFC_DESCRIPTOR_STRIDE(source,n);
@@ -91,7 +90,7 @@ internal_pack_'rtype_ccode` ('rtype` * source)
       src += stride0;
       count[0]++;
       /* Advance to the next source element.  */
-      n = 0;
+      index_type n = 0;
       while (count[n] == extent[n])
         {
           /* When we get to the end of a dimension, reset it and increment
diff --git a/libgfortran/m4/in_unpack.m4 b/libgfortran/m4/in_unpack.m4
index 776bbbf886e..b6ca9b242fe 100644
--- a/libgfortran/m4/in_unpack.m4
+++ b/libgfortran/m4/in_unpack.m4
@@ -42,7 +42,6 @@ internal_unpack_'rtype_ccode` ('rtype` * d, const 'rtype_name` * src)
   index_type dim;
   index_type dsize;
   'rtype_name` * restrict dest;
-  int n;
 
   dest = d->base_addr;
   if (src == dest || !src)
@@ -50,7 +49,7 @@ internal_unpack_'rtype_ccode` ('rtype` * d, const 'rtype_name` * src)
 
   dim = GFC_DESCRIPTOR_RANK (d);
   dsize = 1;
-  for (n = 0; n < dim; n++)
+  for (index_type n = 0; n < dim; n++)
     {
       count[n] = 0;
       stride[n] = GFC_DESCRIPTOR_STRIDE(d,n);
@@ -80,7 +79,7 @@ internal_unpack_'rtype_ccode` ('rtype` * d, const 'rtype_name` * src)
       dest += stride0;
       count[0]++;
       /* Advance to the next source element.  */
-      n = 0;
+      index_type n = 0;
       while (count[n] == extent[n])
         {
           /* When we get to the end of a dimension, reset it and increment
diff --git a/libgfortran/m4/reshape.m4 b/libgfortran/m4/reshape.m4
index 79cbca3feed..108911685de 100644
--- a/libgfortran/m4/reshape.m4
+++ b/libgfortran/m4/reshape.m4
@@ -76,8 +76,6 @@ reshape_'rtype_ccode` ('rtype` * const restrict ret,
   const 'rtype_name` *pptr;
 
   const 'rtype_name` *src;
-  int n;
-  int dim;
   int sempty, pempty, shape_empty;
   index_type shape_data[GFC_MAX_DIMENSIONS];
 
@@ -91,7 +89,7 @@ reshape_'rtype_ccode` ('rtype` * const restrict ret,
 
   shape_empty = 0;
 
-  for (n = 0; n < rdim; n++)
+  for (index_type n = 0; n < rdim; n++)
     {
       shape_data[n] = shape->base_addr[n * GFC_DESCRIPTOR_STRIDE(shape,0)];
       if (shape_data[n] <= 0)
@@ -106,7 +104,7 @@ reshape_'rtype_ccode` ('rtype` * const restrict ret,
       index_type alloc_size;
 
       rs = 1;
-      for (n = 0; n < rdim; n++)
+      for (index_type n = 0; n < rdim; n++)
 	{
 	  rex = shape_data[n];
 
@@ -133,7 +131,7 @@ reshape_'rtype_ccode` ('rtype` * const restrict ret,
       pdim = GFC_DESCRIPTOR_RANK (pad);
       psize = 1;
       pempty = 0;
-      for (n = 0; n < pdim; n++)
+      for (index_type n = 0; n < pdim; n++)
         {
           pcount[n] = 0;
           pstride[n] = GFC_DESCRIPTOR_STRIDE(pad,n);
@@ -164,7 +162,7 @@ reshape_'rtype_ccode` ('rtype` * const restrict ret,
       index_type ret_extent, source_extent;
 
       rs = 1;
-      for (n = 0; n < rdim; n++)
+      for (index_type n = 0; n < rdim; n++)
 	{
 	  rs *= shape_data[n];
 	  ret_extent = GFC_DESCRIPTOR_EXTENT(ret,n);
@@ -177,7 +175,7 @@ reshape_'rtype_ccode` ('rtype` * const restrict ret,
 
       source_extent = 1;
       sdim = GFC_DESCRIPTOR_RANK (source);
-      for (n = 0; n < sdim; n++)
+      for (index_type n = 0; n < sdim; n++)
 	{
 	  index_type se;
 	  se = GFC_DESCRIPTOR_EXTENT(source,n);
@@ -194,10 +192,10 @@ reshape_'rtype_ccode` ('rtype` * const restrict ret,
 	  int seen[GFC_MAX_DIMENSIONS];
 	  index_type v;
 
-	  for (n = 0; n < rdim; n++)
+	  for (index_type n = 0; n < rdim; n++)
 	    seen[n] = 0;
 
-	  for (n = 0; n < rdim; n++)
+	  for (index_type n = 0; n < rdim; n++)
 	    {
 	      v = order->base_addr[n * GFC_DESCRIPTOR_STRIDE(order,0)] - 1;
 
@@ -215,8 +213,9 @@ reshape_'rtype_ccode` ('rtype` * const restrict ret,
     }
 
   rsize = 1;
-  for (n = 0; n < rdim; n++)
+  for (index_type n = 0; n < rdim; n++)
     {
+      index_type dim;
       if (order)
         dim = order->base_addr[n * GFC_DESCRIPTOR_STRIDE(order,0)] - 1;
       else
@@ -247,7 +246,7 @@ reshape_'rtype_ccode` ('rtype` * const restrict ret,
 
   ssize = 1;
   sempty = 0;
-  for (n = 0; n < sdim; n++)
+  for (index_type n = 0; n < sdim; n++)
     {
       scount[n] = 0;
       sstride[n] = GFC_DESCRIPTOR_STRIDE(source,n);
@@ -287,7 +286,7 @@ reshape_'rtype_ccode` ('rtype` * const restrict ret,
       src = pptr;
       sptr = pptr;
       sdim = pdim;
-      for (dim = 0; dim < pdim; dim++)
+      for (index_type dim = 0; dim < pdim; dim++)
 	{
 	  scount[dim] = pcount[dim];
 	  sextent[dim] = pextent[dim];
@@ -307,7 +306,7 @@ reshape_'rtype_ccode` ('rtype` * const restrict ret,
       scount[0]++;
 
       /* Advance to the next destination element.  */
-      n = 0;
+      index_type n = 0;
       while (rcount[n] == rextent[n])
         {
           /* When we get to the end of a dimension, reset it and increment
@@ -347,7 +346,7 @@ reshape_'rtype_ccode` ('rtype` * const restrict ret,
                   /* Switch to the pad array.  */
                   sptr = NULL;
                   sdim = pdim;
-                  for (dim = 0; dim < pdim; dim++)
+                  for (index_type dim = 0; dim < pdim; dim++)
                     {
                       scount[dim] = pcount[dim];
                       sextent[dim] = pextent[dim];
diff --git a/libgfortran/m4/shape.m4 b/libgfortran/m4/shape.m4
index c355ca131d9..ac0b88038a3 100644
--- a/libgfortran/m4/shape.m4
+++ b/libgfortran/m4/shape.m4
@@ -37,12 +37,10 @@ void
 shape_'rtype_kind` ('rtype` * const restrict ret, 
 	const array_t * const restrict array)
 {
-  int n;
   index_type stride;
   index_type extent;
-  int rank;
 
-  rank = GFC_DESCRIPTOR_RANK (array);
+  int rank = GFC_DESCRIPTOR_RANK (array);
 
   if (ret->base_addr == NULL)
     {
@@ -56,7 +54,7 @@ shape_'rtype_kind` ('rtype` * const restrict ret,
   if (GFC_DESCRIPTOR_EXTENT(ret,0) < 1)
     return;
 
-  for (n = 0; n < rank; n++)
+  for (index_type n = 0; n < rank; n++)
     {
       extent = GFC_DESCRIPTOR_EXTENT(array,n);
       ret->base_addr[n * stride] = extent > 0 ? extent : 0 ;
diff --git a/libgfortran/m4/spread.m4 b/libgfortran/m4/spread.m4
index e8c52aad144..b5a0b4ed363 100644
--- a/libgfortran/m4/spread.m4
+++ b/libgfortran/m4/spread.m4
@@ -228,10 +228,8 @@ spread_'rtype_code` ('rtype` *ret, const 'rtype` *source,
 
 void
 spread_scalar_'rtype_code` ('rtype` *ret, const 'rtype_name` *source,
-			const index_type along, const index_type pncopies)
+			const index_type along, const index_type ncopies)
 {
-  int n;
-  int ncopies = pncopies;
   'rtype_name` * restrict dest;
   index_type stride;
 
@@ -257,7 +255,7 @@ spread_scalar_'rtype_code` ('rtype` *ret, const 'rtype_name` *source,
   dest = ret->base_addr;
   stride = GFC_DESCRIPTOR_STRIDE(ret,0);
 
-  for (n = 0; n < ncopies; n++)
+  for (index_type n = 0; n < ncopies; n++)
     {
       *dest = *source;
       dest += stride;