[svn-r24709] rename H5V to H5VM since H5V is needed in the fastforward project for

view objects.  The addition of view objects in the fastforward project
is expected to be brough into the trunk sometimes in the future, which
is why we need to make this change.

Tested Manually on Jam and Ostrich.
Tested with h5commitest - Koala with intel compilers failed, but nothing had to do with those changes.
error on Koala: error while loading shared libraries: libirng.so

1 files changed, 1712 insertions, 0 deletions

diff --git a/src/H5VM.c b/src/H5VM.c
new file mode 100644
index 0000000..6f72c57
--- /dev/null
+++ b/src/H5VM.c
@@ -0,0 +1,1712 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Programmer: Robb Matzke <matzke@llnl.gov>
+ *	       Friday, October 10, 1997
+ */
+
+
+#include "H5private.h"
+#include "H5Eprivate.h"
+#include "H5Oprivate.h"
+#include "H5VMprivate.h"
+
+/* Local typedefs */
+typedef struct H5VM_memcpy_ud_t {
+    unsigned char *dst;         /* Pointer to destination buffer */
+    const unsigned char *src;   /* Pointer to source buffer */
+} H5VM_memcpy_ud_t;
+
+/* Local macros */
+#define H5VM_HYPER_NDIMS H5O_LAYOUT_NDIMS
+
+/* Local prototypes */
+static void
+H5VM_stride_optimize1(unsigned *np/*in,out*/, hsize_t *elmt_size/*in,out*/,
+		     const hsize_t *size, hsize_t *stride1);
+static void
+H5VM_stride_optimize2(unsigned *np/*in,out*/, hsize_t *elmt_size/*in,out*/,
+		     const hsize_t *size, hsize_t *stride1, hsize_t *stride2);
+#ifdef LATER
+static void
+H5VM_stride_copy2(hsize_t nelmts, hsize_t elmt_size,
+     unsigned dst_n, const hsize_t *dst_size, const ssize_t *dst_stride, void *_dst,
+     unsigned src_n, const hsize_t *src_size, const ssize_t *src_stride, const void *_src);
+#endif /* LATER */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_stride_optimize1
+ *
+ * Purpose:	Given a stride vector which references elements of the
+ *		specified size, optimize the dimensionality, the stride
+ *		vector, and the element size to minimize the dimensionality
+ *		and the number of memory accesses.
+ *
+ *		All arguments are passed by reference and their values may be
+ *		modified by this function.
+ *
+ * Return:	None
+ *
+ * Programmer:	Robb Matzke
+ *		Saturday, October 11, 1997
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+static void
+H5VM_stride_optimize1(unsigned *np/*in,out*/, hsize_t *elmt_size/*in,out*/,
+		     const hsize_t *size, hsize_t *stride1)
+{
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    /*
+     * This has to be true because if we optimize the dimensionality down to
+     * zero we still must make one reference.
+     */
+    HDassert(1 == H5VM_vector_reduce_product(0, NULL));
+
+    /*
+     * Combine adjacent memory accesses
+     */
+    while (*np && stride1[*np-1]>0 &&
+           (hsize_t)(stride1[*np-1])==*elmt_size) {
+        *elmt_size *= size[*np-1];
+        if (--*np)
+            stride1[*np-1] += size[*np] * stride1[*np];
+    }
+
+    FUNC_LEAVE_NOAPI_VOID
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_stride_optimize2
+ *
+ * Purpose:	Given two stride vectors which reference elements of the
+ *		specified size, optimize the dimensionality, the stride
+ *		vectors, and the element size to minimize the dimensionality
+ *		and the number of memory accesses.
+ *
+ *		All arguments are passed by reference and their values may be
+ *		modified by this function.
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Robb Matzke
+ *		Saturday, October 11, 1997
+ *
+ * Modifications:
+ *              Unrolled loops for common cases
+ *              Quincey Koziol
+ *		?, ? ?, 2001?
+ *
+ *-------------------------------------------------------------------------
+ */
+static void
+H5VM_stride_optimize2(unsigned *np/*in,out*/, hsize_t *elmt_size/*in,out*/,
+		     const hsize_t *size, hsize_t *stride1, hsize_t *stride2)
+{
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    /*
+     * This has to be true because if we optimize the dimensionality down to
+     * zero we still must make one reference.
+     */
+    HDassert(1 == H5VM_vector_reduce_product(0, NULL));
+    HDassert(*elmt_size>0);
+
+    /*
+     * Combine adjacent memory accesses
+     */
+
+    /* Unroll loop for common cases */
+    switch(*np) {
+        case 1: /* For 0-D datasets (dunno if this ever gets used...) */
+            if(stride1[0] == *elmt_size && stride2[0] == *elmt_size) {
+                *elmt_size *= size[0];
+                --*np;  /* *np decrements to a value of 0 now */
+            } /* end if */
+            break;
+
+        case 2: /* For 1-D datasets */
+            if(stride1[1] == *elmt_size && stride2[1] == *elmt_size) {
+                *elmt_size *= size[1];
+                --*np;  /* *np decrements to a value of 1 now */
+                stride1[0] += size[1] * stride1[1];
+                stride2[0] += size[1] * stride2[1];
+
+                if(stride1[0] == *elmt_size && stride2[0] == *elmt_size) {
+                    *elmt_size *= size[0];
+                    --*np;  /* *np decrements to a value of 0 now */
+                } /* end if */
+            } /* end if */
+            break;
+
+        case 3: /* For 2-D datasets */
+            if(stride1[2] == *elmt_size && stride2[2] == *elmt_size) {
+                *elmt_size *= size[2];
+                --*np;  /* *np decrements to a value of 2 now */
+                stride1[1] += size[2] * stride1[2];
+                stride2[1] += size[2] * stride2[2];
+
+                if(stride1[1] == *elmt_size && stride2[1] == *elmt_size) {
+                    *elmt_size *= size[1];
+                    --*np;  /* *np decrements to a value of 1 now */
+                    stride1[0] += size[1] * stride1[1];
+                    stride2[0] += size[1] * stride2[1];
+
+                    if(stride1[0] == *elmt_size && stride2[0] == *elmt_size) {
+                        *elmt_size *= size[0];
+                        --*np;  /* *np decrements to a value of 0 now */
+                    } /* end if */
+                } /* end if */
+            } /* end if */
+            break;
+
+        case 4: /* For 3-D datasets */
+            if(stride1[3] == *elmt_size && stride2[3] == *elmt_size) {
+                *elmt_size *= size[3];
+                --*np;  /* *np decrements to a value of 3 now */
+                stride1[2] += size[3] * stride1[3];
+                stride2[2] += size[3] * stride2[3];
+
+                if(stride1[2] == *elmt_size && stride2[2] == *elmt_size) {
+                    *elmt_size *= size[2];
+                    --*np;  /* *np decrements to a value of 2 now */
+                    stride1[1] += size[2] * stride1[2];
+                    stride2[1] += size[2] * stride2[2];
+
+                    if(stride1[1] == *elmt_size && stride2[1] == *elmt_size) {
+                        *elmt_size *= size[1];
+                        --*np;  /* *np decrements to a value of 1 now */
+                        stride1[0] += size[1] * stride1[1];
+                        stride2[0] += size[1] * stride2[1];
+
+                        if(stride1[0] == *elmt_size && stride2[0] == *elmt_size) {
+                            *elmt_size *= size[0];
+                            --*np;  /* *np decrements to a value of 0 now */
+                        } /* end if */
+                    } /* end if */
+                } /* end if */
+            } /* end if */
+            break;
+
+        default:
+            while (*np &&
+                    stride1[*np-1] == *elmt_size &&
+                    stride2[*np-1] == *elmt_size) {
+                *elmt_size *= size[*np-1];
+                if (--*np) {
+                    stride1[*np-1] += size[*np] * stride1[*np];
+                    stride2[*np-1] += size[*np] * stride2[*np];
+                }
+            }
+            break;
+    } /* end switch */
+
+    FUNC_LEAVE_NOAPI_VOID
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_hyper_stride
+ *
+ * Purpose:	Given a description of a hyperslab, this function returns
+ *		(through STRIDE[]) the byte strides appropriate for accessing
+ *		all bytes of the hyperslab and the byte offset where the
+ *		striding will begin.  The SIZE can be passed to the various
+ *		stride functions.
+ *
+ *		The dimensionality of the whole array, the hyperslab, and the
+ *		returned stride array is N.  The whole array dimensions are
+ *		TOTAL_SIZE and the hyperslab is at offset OFFSET and has
+ *		dimensions SIZE.
+ *
+ *		The stride and starting point returned will cause the
+ *		hyperslab elements to be referenced in C order.
+ *
+ * Return:	Success:	Byte offset from beginning of array to start
+ *				of striding.
+ *
+ *		Failure:	abort() -- should never fail
+ *
+ * Programmer:	Robb Matzke
+ *		Saturday, October 11, 1997
+ *
+ * Modifications:
+ *              Unrolled loops for common cases
+ *              Quincey Koziol
+ *		?, ? ?, 2001?
+ *
+ *-------------------------------------------------------------------------
+ */
+hsize_t
+H5VM_hyper_stride(unsigned n, const hsize_t *size,
+		 const hsize_t *total_size, const hsize_t *offset,
+		 hsize_t *stride/*out*/)
+{
+    hsize_t	    skip;	/*starting point byte offset		*/
+    hsize_t	    acc;	/*accumulator				*/
+    int		i;		/*counter				*/
+    hsize_t	    ret_value;  /* Return value */
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    HDassert(n <= H5VM_HYPER_NDIMS);
+    HDassert(size);
+    HDassert(total_size);
+    HDassert(stride);
+
+    /* init */
+    HDassert(n>0);
+    stride[n-1] = 1;
+    skip = offset ? offset[n-1] : 0;
+
+    switch(n) {
+        case 2: /* 1-D dataset */
+            HDassert(total_size[1]>=size[1]);
+            stride[0] = total_size[1]-size[1]; /*overflow checked*/
+            acc = total_size[1];
+            skip += acc * (offset ? offset[0] : 0);
+            break;
+
+        case 3: /* 2-D dataset */
+            HDassert(total_size[2]>=size[2]);
+            stride[1] = total_size[2]-size[2]; /*overflow checked*/
+            acc = total_size[2];
+            skip += acc * (offset ? (hsize_t)offset[1] : 0);
+
+            HDassert(total_size[1]>=size[1]);
+            stride[0] = acc * (total_size[1] - size[1]); /*overflow checked*/
+            acc *= total_size[1];
+            skip += acc * (offset ? (hsize_t)offset[0] : 0);
+            break;
+
+        case 4: /* 3-D dataset */
+            HDassert(total_size[3]>=size[3]);
+            stride[2] = total_size[3]-size[3]; /*overflow checked*/
+            acc = total_size[3];
+            skip += acc * (offset ? (hsize_t)offset[2] : 0);
+
+            HDassert(total_size[2]>=size[2]);
+            stride[1] = acc * (total_size[2] - size[2]); /*overflow checked*/
+            acc *= total_size[2];
+            skip += acc * (offset ? (hsize_t)offset[1] : 0);
+
+            HDassert(total_size[1]>=size[1]);
+            stride[0] = acc * (total_size[1] - size[1]); /*overflow checked*/
+            acc *= total_size[1];
+            skip += acc * (offset ? (hsize_t)offset[0] : 0);
+            break;
+
+        default:
+            /* others */
+            for (i=(int)(n-2), acc=1; i>=0; --i) {
+                HDassert(total_size[i+1]>=size[i+1]);
+                stride[i] = acc * (total_size[i+1] - size[i+1]); /*overflow checked*/
+                acc *= total_size[i+1];
+                skip += acc * (offset ? (hsize_t)offset[i] : 0);
+            }
+            break;
+    } /* end switch */
+
+    /* Set return value */
+    ret_value=skip;
+
+    FUNC_LEAVE_NOAPI(ret_value)
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_hyper_eq
+ *
+ * Purpose:	Determines whether two hyperslabs are equal.  This function
+ *		assumes that both hyperslabs are relative to the same array,
+ *		for if not, they could not possibly be equal.
+ *
+ * Return:	Success:	TRUE if the hyperslabs are equal (that is,
+ *				both refer to exactly the same elements of an
+ *				array)
+ *
+ *				FALSE otherwise.
+ *
+ *		Failure:	TRUE the rank is zero or if both hyperslabs
+ *				are of zero size.
+ *
+ * Programmer:	Robb Matzke
+ *		Friday, October 17, 1997
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+htri_t
+H5VM_hyper_eq(unsigned n,
+	     const hsize_t *offset1, const hsize_t *size1,
+	     const hsize_t *offset2, const hsize_t *size2)
+{
+    hsize_t	nelmts1 = 1, nelmts2 = 1;
+    unsigned	i;
+    htri_t      ret_value=TRUE;         /* Return value */
+
+    /* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    if (n == 0) HGOTO_DONE(TRUE)
+
+    for (i=0; i<n; i++) {
+	if ((offset1 ? offset1[i] : 0) != (offset2 ? offset2[i] : 0))
+	    HGOTO_DONE(FALSE)
+	if ((size1 ? size1[i] : 0) != (size2 ? size2[i] : 0))
+	    HGOTO_DONE(FALSE)
+	if (0 == (nelmts1 *= (size1 ? size1[i] : 0)))
+            HGOTO_DONE(FALSE)
+	if (0 == (nelmts2 *= (size2 ? size2[i] : 0)))
+            HGOTO_DONE(FALSE)
+    }
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_hyper_disjointp
+ *
+ * Purpose:	Determines if two hyperslabs are disjoint.
+ *
+ * Return:	Success:	FALSE if they are not disjoint.
+ *				TRUE if they are disjoint.
+ *
+ *		Failure:	A hyperslab of zero size is disjoint from all
+ *				other hyperslabs.
+ *
+ * Programmer:	Robb Matzke
+ *		Thursday, October 16, 1997
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+htri_t
+H5VM_hyper_disjointp(unsigned n,
+    const hsize_t *offset1, const uint32_t *size1,
+    const hsize_t *offset2, const uint32_t *size2)
+{
+    unsigned	u;
+    htri_t      ret_value = FALSE;        /* Return value */
+
+    /* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    if(!n || !size1 || !size2)
+        HGOTO_DONE(TRUE)
+
+    for(u = 0; u < n; u++) {
+        HDassert(size1[u] < HSIZET_MAX);
+        HDassert(size2[u] < HSIZET_MAX);
+
+        if(0 == size1[u] || 0 == size2[u])
+            HGOTO_DONE(TRUE)
+        if(((offset1 ? offset1[u] : 0) < (offset2 ? offset2[u] : 0) &&
+                    ((offset1 ? offset1[u] : 0) + size1[u] <= (offset2 ? offset2[u] : 0))) ||
+                ((offset2 ? offset2[u] : 0) < (offset1 ? offset1[u] : 0) &&
+                    ((offset2 ? offset2[u] : 0) + size2[u] <= (offset1 ? offset1[u] : 0))))
+            HGOTO_DONE(TRUE)
+    } /* end for */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VM_hyper_disjointp() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_hyper_fill
+ *
+ * Purpose:	Similar to memset() except it operates on hyperslabs...
+ *
+ *		Fills a hyperslab of array BUF with some value VAL.  BUF
+ *		is treated like a C-order array with N dimensions where the
+ *		size of each dimension is TOTAL_SIZE[].	 The hyperslab which
+ *		will be filled with VAL begins at byte offset OFFSET[] from
+ *		the minimum corner of BUF and continues for SIZE[] bytes in
+ *		each dimension.
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Robb Matzke
+ *		Friday, October 10, 1997
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VM_hyper_fill(unsigned n, const hsize_t *_size,
+	       const hsize_t *total_size, const hsize_t *offset, void *_dst,
+	       unsigned fill_value)
+{
+    uint8_t	*dst = (uint8_t*)_dst;	/*cast for ptr arithmetic	*/
+    hsize_t	size[H5VM_HYPER_NDIMS];	/*a modifiable copy of _size	*/
+    hsize_t	dst_stride[H5VM_HYPER_NDIMS]; /*destination stride info  */
+    hsize_t	dst_start;		/*byte offset to start of stride*/
+    hsize_t	elmt_size = 1;		/*bytes per element		*/
+    herr_t	ret_value;		/*function return status	*/
+#ifndef NDEBUG
+    unsigned	u;
+#endif
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    /* check args */
+    HDassert(n > 0 && n <= H5VM_HYPER_NDIMS);
+    HDassert(_size);
+    HDassert(total_size);
+    HDassert(dst);
+#ifndef NDEBUG
+    for (u = 0; u < n; u++) {
+        HDassert(_size[u] > 0);
+        HDassert(total_size[u] > 0);
+    }
+#endif
+
+    /* Copy the size vector so we can modify it */
+    H5VM_vector_cpy(n, size, _size);
+
+    /* Compute an optimal destination stride vector */
+    dst_start = H5VM_hyper_stride(n, size, total_size, offset, dst_stride);
+    H5VM_stride_optimize1(&n, &elmt_size, size, dst_stride);
+
+    /* Copy */
+    ret_value = H5VM_stride_fill(n, elmt_size, size, dst_stride, dst+dst_start,
+			     fill_value);
+
+    FUNC_LEAVE_NOAPI(ret_value)
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_hyper_copy
+ *
+ * Purpose:	Copies a hyperslab from the source to the destination.
+ *
+ *		A hyperslab is a logically contiguous region of
+ *		multi-dimensional size SIZE of an array whose dimensionality
+ *		is N and whose total size is DST_TOTAL_SIZE or SRC_TOTAL_SIZE.
+ *		The minimum corner of the hyperslab begins at a
+ *		multi-dimensional offset from the minimum corner of the DST
+ *		(destination) or SRC (source) array.  The sizes and offsets
+ *		are assumed to be in C order, that is, the first size/offset
+ *		varies the slowest while the last varies the fastest in the
+ *		mapping from N-dimensional space to linear space.  This
+ *		function assumes that the array elements are single bytes (if
+ *		your array has multi-byte elements then add an additional
+ *		dimension whose size is that of your element).
+ *
+ *		The SRC and DST array may be the same array, but the results
+ *		are undefined if the source hyperslab overlaps the
+ *		destination hyperslab.
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Robb Matzke
+ *		Friday, October 10, 1997
+ *
+ * Modifications:
+ *              Unrolled loops for common cases
+ *              Quincey Koziol
+ *		?, ? ?, 2001?
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VM_hyper_copy(unsigned n, const hsize_t *_size,
+
+	       /*destination*/
+	       const hsize_t *dst_size, const hsize_t *dst_offset,
+	       void *_dst,
+
+	       /*source*/
+	       const hsize_t *src_size, const hsize_t *src_offset,
+	       const void *_src)
+{
+    const uint8_t *src = (const uint8_t*)_src;	/*cast for ptr arithmtc */
+    uint8_t	*dst = (uint8_t*) _dst;		/*cast for ptr arithmtc */
+    hsize_t	size[H5VM_HYPER_NDIMS];		/*a modifiable _size	*/
+    hsize_t	src_stride[H5VM_HYPER_NDIMS];	/*source stride info	*/
+    hsize_t	dst_stride[H5VM_HYPER_NDIMS];	/*dest stride info	*/
+    hsize_t	dst_start, src_start;		/*offset to start at	*/
+    hsize_t	elmt_size = 1;			/*element size in bytes */
+    herr_t	ret_value;			/*return status		*/
+#ifndef NDEBUG
+    unsigned	u;
+#endif
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    /* check args */
+    HDassert(n > 0 && n <= H5VM_HYPER_NDIMS);
+    HDassert(_size);
+    HDassert(dst_size);
+    HDassert(src_size);
+    HDassert(dst);
+    HDassert(src);
+#ifndef NDEBUG
+    for (u = 0; u < n; u++) {
+        HDassert(_size[u] > 0);
+        HDassert(dst_size[u] > 0);
+        HDassert(src_size[u] > 0);
+    }
+#endif
+
+    /* Copy the size vector so we can modify it */
+    H5VM_vector_cpy(n, size, _size);
+
+    /* Compute stride vectors for source and destination */
+#ifdef NO_INLINED_CODE
+    dst_start = H5VM_hyper_stride(n, size, dst_size, dst_offset, dst_stride);
+    src_start = H5VM_hyper_stride(n, size, src_size, src_offset, src_stride);
+#else /* NO_INLINED_CODE */
+    /* in-line version of two calls to H5VM_hyper_stride() */
+    {
+        hsize_t	    dst_acc;	/*accumulator				*/
+        hsize_t	    src_acc;	/*accumulator				*/
+        int        ii;		    /*counter				*/
+
+        /* init */
+        HDassert(n>0);
+        dst_stride[n-1] = 1;
+        src_stride[n-1] = 1;
+        dst_start = dst_offset ? dst_offset[n-1] : 0;
+        src_start = src_offset ? src_offset[n-1] : 0;
+
+        /* Unroll loop for common cases */
+        switch(n) {
+            case 2:
+                HDassert(dst_size[1]>=size[1]);
+                HDassert(src_size[1]>=size[1]);
+                dst_stride[0] = dst_size[1] - size[1]; /*overflow checked*/
+                src_stride[0] = src_size[1] - size[1]; /*overflow checked*/
+                dst_acc = dst_size[1];
+                src_acc = src_size[1];
+                dst_start += dst_acc * (dst_offset ? dst_offset[0] : 0);
+                src_start += src_acc * (src_offset ? src_offset[0] : 0);
+                break;
+
+            case 3:
+                HDassert(dst_size[2]>=size[2]);
+                HDassert(src_size[2]>=size[2]);
+                dst_stride[1] = dst_size[2] - size[2]; /*overflow checked*/
+                src_stride[1] = src_size[2] - size[2]; /*overflow checked*/
+                dst_acc = dst_size[2];
+                src_acc = src_size[2];
+                dst_start += dst_acc * (dst_offset ? dst_offset[1] : 0);
+                src_start += src_acc * (src_offset ? src_offset[1] : 0);
+
+                HDassert(dst_size[1]>=size[1]);
+                HDassert(src_size[1]>=size[1]);
+                dst_stride[0] = dst_acc * (dst_size[1] - size[1]); /*overflow checked*/
+                src_stride[0] = src_acc * (src_size[1] - size[1]); /*overflow checked*/
+                dst_acc *= dst_size[1];
+                src_acc *= src_size[1];
+                dst_start += dst_acc * (dst_offset ? dst_offset[0] : 0);
+                src_start += src_acc * (src_offset ? src_offset[0] : 0);
+                break;
+
+            case 4:
+                HDassert(dst_size[3]>=size[3]);
+                HDassert(src_size[3]>=size[3]);
+                dst_stride[2] = dst_size[3] - size[3]; /*overflow checked*/
+                src_stride[2] = src_size[3] - size[3]; /*overflow checked*/
+                dst_acc = dst_size[3];
+                src_acc = src_size[3];
+                dst_start += dst_acc * (dst_offset ? dst_offset[2] : 0);
+                src_start += src_acc * (src_offset ? src_offset[2] : 0);
+
+                HDassert(dst_size[2]>=size[2]);
+                HDassert(src_size[2]>=size[2]);
+                dst_stride[1] = dst_acc * (dst_size[2] - size[2]); /*overflow checked*/
+                src_stride[1] = src_acc * (src_size[2] - size[2]); /*overflow checked*/
+                dst_acc *= dst_size[2];
+                src_acc *= src_size[2];
+                dst_start += dst_acc * (dst_offset ? dst_offset[1] : 0);
+                src_start += src_acc * (src_offset ? src_offset[1] : 0);
+
+                HDassert(dst_size[1]>=size[1]);
+                HDassert(src_size[1]>=size[1]);
+                dst_stride[0] = dst_acc * (dst_size[1] - size[1]); /*overflow checked*/
+                src_stride[0] = src_acc * (src_size[1] - size[1]); /*overflow checked*/
+                dst_acc *= dst_size[1];
+                src_acc *= src_size[1];
+                dst_start += dst_acc * (dst_offset ? dst_offset[0] : 0);
+                src_start += src_acc * (src_offset ? src_offset[0] : 0);
+                break;
+
+            default:
+                /* others */
+                for (ii=(int)(n-2), dst_acc=1, src_acc=1; ii>=0; --ii) {
+                    HDassert(dst_size[ii+1]>=size[ii+1]);
+                    HDassert(src_size[ii+1]>=size[ii+1]);
+                    dst_stride[ii] = dst_acc * (dst_size[ii+1] - size[ii+1]); /*overflow checked*/
+                    src_stride[ii] = src_acc * (src_size[ii+1] - size[ii+1]); /*overflow checked*/
+                    dst_acc *= dst_size[ii+1];
+                    src_acc *= src_size[ii+1];
+                    dst_start += dst_acc * (dst_offset ? dst_offset[ii] : 0);
+                    src_start += src_acc * (src_offset ? src_offset[ii] : 0);
+                }
+                break;
+        } /* end switch */
+    }
+#endif /* NO_INLINED_CODE */
+
+    /* Optimize the strides as a pair */
+    H5VM_stride_optimize2(&n, &elmt_size, size, dst_stride, src_stride);
+
+    /* Perform the copy in terms of stride */
+    ret_value = H5VM_stride_copy(n, elmt_size, size,
+             dst_stride, dst+dst_start, src_stride, src+src_start);
+
+    FUNC_LEAVE_NOAPI(ret_value)
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_stride_fill
+ *
+ * Purpose:	Fills all bytes of a hyperslab with the same value using
+ *		memset().
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Robb Matzke
+ *		Saturday, October 11, 1997
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VM_stride_fill(unsigned n, hsize_t elmt_size, const hsize_t *size,
+		const hsize_t *stride, void *_dst, unsigned fill_value)
+{
+    uint8_t	*dst = (uint8_t*)_dst; 	/*cast for ptr arithmetic	*/
+    hsize_t	idx[H5VM_HYPER_NDIMS]; 	/*1-origin indices		*/
+    hsize_t	nelmts;			/*number of elements to fill	*/
+    hsize_t	i;			/*counter			*/
+    int	j;			/*counter			*/
+    hbool_t	carry;			/*subtraction carray value	*/
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    HDassert(elmt_size < SIZET_MAX);
+
+    H5VM_vector_cpy(n, idx, size);
+    nelmts = H5VM_vector_reduce_product(n, size);
+    for (i=0; i<nelmts; i++) {
+        /* Copy an element */
+        H5_CHECK_OVERFLOW(elmt_size,hsize_t,size_t);
+        HDmemset(dst, (int)fill_value, (size_t)elmt_size); /*lint !e671 The elmt_size will be OK */
+
+        /* Decrement indices and advance pointer */
+        for (j=(int)(n-1), carry=TRUE; j>=0 && carry; --j) {
+            dst += stride[j];
+
+            if (--idx[j])
+                carry = FALSE;
+            else {
+                HDassert(size);
+                idx[j] = size[j];
+            } /* end else */
+        }
+    }
+
+    FUNC_LEAVE_NOAPI(SUCCEED)
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_stride_copy
+ *
+ * Purpose:	Uses DST_STRIDE and SRC_STRIDE to advance through the arrays
+ *		DST and SRC while copying bytes from SRC to DST.  This
+ *		function minimizes the number of calls to memcpy() by
+ *		combining various strides, but it will never touch memory
+ *		outside the hyperslab defined by the strides.
+ *
+ * Note:	If the src_stride is all zero and elmt_size is one, then it's
+ *		probably more efficient to use H5VM_stride_fill() instead.
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Robb Matzke
+ *		Saturday, October 11, 1997
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VM_stride_copy(unsigned n, hsize_t elmt_size, const hsize_t *size,
+		const hsize_t *dst_stride, void *_dst,
+		const hsize_t *src_stride, const void *_src)
+{
+    uint8_t	*dst = (uint8_t*)_dst;		/*cast for ptr arithmetic*/
+    const uint8_t *src = (const uint8_t*) _src;	/*cast for ptr arithmetic*/
+    hsize_t	idx[H5VM_HYPER_NDIMS];		/*1-origin indices	*/
+    hsize_t	nelmts;				/*num elements to copy	*/
+    hsize_t	i;				/*counter		*/
+    int	j;				/*counters		*/
+    hbool_t	carry;				/*carray for subtraction*/
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    HDassert(elmt_size<SIZET_MAX);
+
+    if (n) {
+        H5VM_vector_cpy(n, idx, size);
+        nelmts = H5VM_vector_reduce_product(n, size);
+        for (i=0; i<nelmts; i++) {
+
+            /* Copy an element */
+            H5_CHECK_OVERFLOW(elmt_size,hsize_t,size_t);
+            HDmemcpy(dst, src, (size_t)elmt_size); /*lint !e671 The elmt_size will be OK */
+
+            /* Decrement indices and advance pointers */
+            for (j=(int)(n-1), carry=TRUE; j>=0 && carry; --j) {
+                src += src_stride[j];
+                dst += dst_stride[j];
+
+                if (--idx[j])
+                    carry = FALSE;
+                else {
+                    HDassert(size);
+                    idx[j] = size[j];
+                }
+            }
+        }
+    } else {
+        H5_CHECK_OVERFLOW(elmt_size,hsize_t,size_t);
+        HDmemcpy (dst, src, (size_t)elmt_size); /*lint !e671 The elmt_size will be OK */
+    }
+
+    FUNC_LEAVE_NOAPI(SUCCEED)
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_stride_copy_s
+ *
+ * Purpose:	Uses DST_STRIDE and SRC_STRIDE to advance through the arrays
+ *		DST and SRC while copying bytes from SRC to DST.  This
+ *		function minimizes the number of calls to memcpy() by
+ *		combining various strides, but it will never touch memory
+ *		outside the hyperslab defined by the strides.
+ *
+ * Note:	If the src_stride is all zero and elmt_size is one, then it's
+ *		probably more efficient to use H5VM_stride_fill() instead.
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Robb Matzke
+ *		Saturday, October 11, 1997
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VM_stride_copy_s(unsigned n, hsize_t elmt_size, const hsize_t *size,
+		const hssize_t *dst_stride, void *_dst,
+		const hssize_t *src_stride, const void *_src)
+{
+    uint8_t	*dst = (uint8_t*)_dst;		/*cast for ptr arithmetic*/
+    const uint8_t *src = (const uint8_t*) _src;	/*cast for ptr arithmetic*/
+    hsize_t	idx[H5VM_HYPER_NDIMS];		/*1-origin indices	*/
+    hsize_t	nelmts;				/*num elements to copy	*/
+    hsize_t	i;				/*counter		*/
+    int	j;				/*counters		*/
+    hbool_t	carry;				/*carray for subtraction*/
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    HDassert(elmt_size<SIZET_MAX);
+
+    if (n) {
+        H5VM_vector_cpy(n, idx, size);
+        nelmts = H5VM_vector_reduce_product(n, size);
+        for (i=0; i<nelmts; i++) {
+
+            /* Copy an element */
+            H5_CHECK_OVERFLOW(elmt_size,hsize_t,size_t);
+            HDmemcpy(dst, src, (size_t)elmt_size); /*lint !e671 The elmt_size will be OK */
+
+            /* Decrement indices and advance pointers */
+            for (j=(int)(n-1), carry=TRUE; j>=0 && carry; --j) {
+                src += src_stride[j];
+                dst += dst_stride[j];
+
+                if (--idx[j])
+                    carry = FALSE;
+                else {
+                    HDassert(size);
+                    idx[j] = size[j];
+                }
+            }
+        }
+    } else {
+        H5_CHECK_OVERFLOW(elmt_size,hsize_t,size_t);
+        HDmemcpy (dst, src, (size_t)elmt_size); /*lint !e671 The elmt_size will be OK */
+    }
+
+    FUNC_LEAVE_NOAPI(SUCCEED)
+}
+
+#ifdef LATER
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_stride_copy2
+ *
+ * Purpose:	Similar to H5VM_stride_copy() except the source and
+ *		destination each have their own dimensionality and size and
+ *		we copy exactly NELMTS elements each of size ELMT_SIZE.	 The
+ *		size counters wrap if NELMTS is more than a size counter.
+ *
+ * Return:	None
+ *
+ * Programmer:	Robb Matzke
+ *		Saturday, October 11, 1997
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+static void
+H5VM_stride_copy2(hsize_t nelmts, hsize_t elmt_size,
+
+		 /* destination */
+		 unsigned dst_n, const hsize_t *dst_size,
+		 const hsize_t *dst_stride,
+		 void *_dst,
+
+		 /* source */
+		 unsigned src_n, const hsize_t *src_size,
+		 const hsize_t *src_stride,
+		 const void *_src)
+{
+    uint8_t	*dst = (uint8_t *) _dst;
+    const uint8_t *src = (const uint8_t *) _src;
+    hsize_t	dst_idx[H5VM_HYPER_NDIMS];
+    hsize_t	src_idx[H5VM_HYPER_NDIMS];
+    hsize_t	i;              /* Local index variable */
+    int		j;              /* Local index variable */
+    hbool_t	carry;
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    HDassert(elmt_size < SIZET_MAX);
+    HDassert(dst_n>0);
+    HDassert(src_n>0);
+
+    H5VM_vector_cpy(dst_n, dst_idx, dst_size);
+    H5VM_vector_cpy(src_n, src_idx, src_size);
+
+    for (i=0; i<nelmts; i++) {
+
+	/* Copy an element */
+        H5_CHECK_OVERFLOW(elmt_size,hsize_t,size_t);
+	HDmemcpy(dst, src, (size_t)elmt_size); /*lint !e671 The elmt_size will be OK */
+
+	/* Decrement indices and advance pointers */
+	for (j=(int)(dst_n-1), carry=TRUE; j>=0 && carry; --j) {
+	    dst += dst_stride[j];
+	    if (--dst_idx[j])
+                carry = FALSE;
+	    else {
+                HDassert(dst_size);
+                dst_idx[j] = dst_size[j];
+            } /* end else */
+	}
+	for (j=(int)(src_n-1), carry=TRUE; j>=0 && carry; --j) {
+	    src += src_stride[j];
+	    if (--src_idx[j])
+                carry = FALSE;
+	    else {
+                HDassert(src_size);
+                src_idx[j] = src_size[j];
+            } /* end else */
+	}
+    }
+
+    FUNC_LEAVE_NOAPI_VOID
+}
+#endif /* LATER */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_array_fill
+ *
+ * Purpose:	Fills all bytes of an array with the same value using
+ *		memset(). Increases amount copied by power of two until the
+ *		halfway point is crossed, then copies the rest in one swoop.
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Quincey Koziol
+ *		Thursday, June 18, 1998
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VM_array_fill(void *_dst, const void *src, size_t size, size_t count)
+{
+    size_t      copy_size;          /* size of the buffer to copy	*/
+    size_t      copy_items;         /* number of items currently copying*/
+    size_t      items_left;         /* number of items left to copy 	*/
+    uint8_t     *dst=(uint8_t*)_dst;/* alias for pointer arithmetic	*/
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    HDassert(dst);
+    HDassert(src);
+    HDassert(size < SIZET_MAX && size > 0);
+    HDassert(count < SIZET_MAX && count > 0);
+
+    HDmemcpy(dst, src, size);   /* copy first item */
+
+    /* Initialize counters, etc. while compensating for first element copied */
+    copy_size = size;
+    copy_items = 1;
+    items_left = count - 1;
+    dst += size;
+
+    /* copy until we've copied at least half of the items */
+    while (items_left >= copy_items)
+    {
+        HDmemcpy(dst, _dst, copy_size);   /* copy the current chunk */
+        dst += copy_size;     /* move the offset for the next chunk */
+        items_left -= copy_items;   /* decrement the number of items left */
+
+        copy_size *= 2;     /* increase the size of the chunk to copy */
+        copy_items *= 2;    /* increase the count of items we are copying */
+    }   /* end while */
+    if (items_left > 0)   /* if there are any items left to copy */
+        HDmemcpy(dst, _dst, items_left * size);
+
+    FUNC_LEAVE_NOAPI(SUCCEED)
+}   /* H5VM_array_fill() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_array_down
+ *
+ * Purpose:	Given a set of dimension sizes, calculate the size of each
+ *              "down" slice.  This is the size of the dimensions for all the
+ *              dimensions below the current one, which is used for indexing
+ *              offsets in this dimension.
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Quincey Koziol
+ *		Monday, April 28, 2003
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VM_array_down(unsigned n, const hsize_t *total_size, hsize_t *down)
+{
+    hsize_t	acc;	                /*accumulator			*/
+    int	        i;		        /*counter			*/
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    HDassert(n <= H5VM_HYPER_NDIMS);
+    HDassert(total_size);
+    HDassert(down);
+
+    /* Build the sizes of each dimension in the array */
+    /* (From fastest to slowest) */
+    for(i=(int)(n-1),acc=1; i>=0; i--) {
+        down[i]=acc;
+        acc *= total_size[i];
+    } /* end for */
+
+    FUNC_LEAVE_NOAPI(SUCCEED)
+} /* end H5VM_array_down() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_array_offset_pre
+ *
+ * Purpose:	Given a coordinate description of a location in an array, this
+ *      function returns the byte offset of the coordinate.
+ *
+ *		The dimensionality of the whole array, and the offset is N.
+ *              The whole array dimensions are TOTAL_SIZE and the coordinate
+ *              is at offset OFFSET.
+ *
+ * Return:	Success: Byte offset from beginning of array to element offset
+ *		Failure: abort() -- should never fail
+ *
+ * Programmer:	Quincey Koziol
+ *		Tuesday, June 22, 1999
+ *
+ * Modifications:
+ *              Use precomputed accumulator array
+ *              Quincey Koziol
+ *		Saturday, April 26, 2003
+ *
+ *-------------------------------------------------------------------------
+ */
+hsize_t
+H5VM_array_offset_pre(unsigned n, const hsize_t *acc, const hsize_t *offset)
+{
+    int             i;		/*counter				*/
+    hsize_t	    ret_value;  /* Return value */
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    HDassert(n <= H5VM_HYPER_NDIMS);
+    HDassert(acc);
+    HDassert(offset);
+
+    /* Compute offset in array */
+    for (i=(int)(n-1), ret_value=0; i>=0; --i)
+        ret_value += acc[i] * offset[i];
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VM_array_offset_pre() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_array_offset
+ *
+ * Purpose:	Given a coordinate description of a location in an array, this
+ *      function returns the byte offset of the coordinate.
+ *
+ *		The dimensionality of the whole array, and the offset is N.
+ *              The whole array dimensions are TOTAL_SIZE and the coordinate
+ *              is at offset OFFSET.
+ *
+ * Return:	Success: Byte offset from beginning of array to element offset
+ *		Failure: abort() -- should never fail
+ *
+ * Programmer:	Quincey Koziol
+ *		Tuesday, June 22, 1999
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+hsize_t
+H5VM_array_offset(unsigned n, const hsize_t *total_size, const hsize_t *offset)
+{
+    hsize_t	acc_arr[H5VM_HYPER_NDIMS];	/* Accumulated size of down dimensions */
+    hsize_t	ret_value;  /* Return value */
+
+    FUNC_ENTER_NOAPI((HDabort(), 0)) /*lint !e527 Don't worry about unreachable statement */
+
+    HDassert(n <= H5VM_HYPER_NDIMS);
+    HDassert(total_size);
+    HDassert(offset);
+
+    /* Build the sizes of each dimension in the array */
+    if(H5VM_array_down(n,total_size,acc_arr)<0)
+        HGOTO_ERROR(H5E_INTERNAL, H5E_BADVALUE, UFAIL, "can't compute down sizes")
+
+    /* Set return value */
+    ret_value=H5VM_array_offset_pre(n,acc_arr,offset);
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VM_array_offset() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_array_calc_pre
+ *
+ * Purpose:	Given a linear offset in an array, the dimensions of that
+ *              array and the pre-computed 'down' (accumulator) sizes, this
+ *              function computes the coordinates of that offset in the array.
+ *
+ *		The dimensionality of the whole array, and the coordinates is N.
+ *              The array dimensions are TOTAL_SIZE and the coordinates
+ *              are returned in COORD.  The linear offset is in OFFSET.
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Quincey Koziol
+ *		Thursday, July 16, 2009
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5VM_array_calc_pre(hsize_t offset, unsigned n, const hsize_t *down,
+    hsize_t *coords)
+{
+    unsigned    u;                      /* Local index variable */
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    /* Sanity check */
+    HDassert(n <= H5VM_HYPER_NDIMS);
+    HDassert(coords);
+
+    /* Compute the coordinates from the offset */
+    for(u = 0; u < n; u++) {
+        coords[u] = offset / down[u];
+        offset %= down[u];
+    } /* end for */
+
+    FUNC_LEAVE_NOAPI(SUCCEED)
+} /* end H5VM_array_calc_pre() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_array_calc
+ *
+ * Purpose:	Given a linear offset in an array and the dimensions of that
+ *              array, this function computes the coordinates of that offset
+ *              in the array.
+ *
+ *		The dimensionality of the whole array, and the coordinates is N.
+ *              The array dimensions are TOTAL_SIZE and the coordinates
+ *              are returned in COORD.  The linear offset is in OFFSET.
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Quincey Koziol
+ *		Wednesday, April 16, 2003
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VM_array_calc(hsize_t offset, unsigned n, const hsize_t *total_size, hsize_t *coords)
+{
+    hsize_t	idx[H5VM_HYPER_NDIMS];	/* Size of each dimension in bytes */
+    herr_t      ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity check */
+    HDassert(n <= H5VM_HYPER_NDIMS);
+    HDassert(total_size);
+    HDassert(coords);
+
+    /* Build the sizes of each dimension in the array */
+    if(H5VM_array_down(n, total_size, idx) < 0)
+        HGOTO_ERROR(H5E_INTERNAL, H5E_BADVALUE, FAIL, "can't compute down sizes")
+
+    /* Compute the coordinates from the offset */
+    if(H5VM_array_calc_pre(offset, n, idx, coords) < 0)
+        HGOTO_ERROR(H5E_INTERNAL, H5E_BADVALUE, FAIL, "can't compute coordinates")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VM_array_calc() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_chunk_index
+ *
+ * Purpose:	Given a coordinate offset (COORD), the size of each chunk
+ *              (CHUNK), the number of chunks in each dimension (NCHUNKS)
+ *              and the number of dimensions of all of these (NDIMS), calculate
+ *              a "chunk index" for the chunk that the coordinate offset is
+ *              located in.
+ *
+ *              The chunk index starts at 0 and increases according to the
+ *              fastest changing dimension, then the next fastest, etc.
+ *
+ *              For example, with a 3x5 chunk size and 6 chunks in the fastest
+ *              changing dimension and 3 chunks in the slowest changing
+ *              dimension, the chunk indices are as follows:
+ *
+ *              +-----+-----+-----+-----+-----+-----+
+ *              |     |     |     |     |     |     |
+ *              |  0  |  1  |  2  |  3  |  4  |  5  |
+ *              |     |     |     |     |     |     |
+ *              +-----+-----+-----+-----+-----+-----+
+ *              |     |     |     |     |     |     |
+ *              |  6  |  7  |  8  |  9  | 10  | 11  |
+ *              |     |     |     |     |     |     |
+ *              +-----+-----+-----+-----+-----+-----+
+ *              |     |     |     |     |     |     |
+ *              | 12  | 13  | 14  | 15  | 16  | 17  |
+ *              |     |     |     |     |     |     |
+ *              +-----+-----+-----+-----+-----+-----+
+ *
+ *              The chunk index is placed in the CHUNK_IDX location for return
+ *              from this function
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Quincey Koziol
+ *		Monday, April 21, 2003
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VM_chunk_index(unsigned ndims, const hsize_t *coord, const uint32_t *chunk,
+    const hsize_t *down_nchunks, hsize_t *chunk_idx)
+{
+    hsize_t	scaled_coord[H5VM_HYPER_NDIMS];	/* Scaled, coordinates, in terms of chunks */
+    unsigned    u;                      /* Local index variable */
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    /* Sanity check */
+    HDassert(ndims <= H5VM_HYPER_NDIMS);
+    HDassert(coord);
+    HDassert(chunk);
+    HDassert(chunk_idx);
+
+    /* Compute the scaled coordinates for actual coordinates */
+    for(u=0; u<ndims; u++)
+        scaled_coord[u]=coord[u]/chunk[u];
+
+    /* Compute the chunk index */
+    *chunk_idx=H5VM_array_offset_pre(ndims,down_nchunks,scaled_coord); /*lint !e772 scaled_coord will always be initialized */
+
+    FUNC_LEAVE_NOAPI(SUCCEED)
+} /* end H5VM_chunk_index() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_opvv
+ *
+ * Purpose:	Perform an operation on a source & destination sequences
+ *		of offset/length pairs.  Each set of sequnces has an array
+ *		of lengths, an array of offsets, the maximum number of
+ *		sequences and the current sequence to start at in the sequence.
+ *
+ *              There may be different numbers of bytes in the source and
+ *              destination sequences, the operation stops when either the
+ *              source or destination sequence runs out of information.
+ *
+ * Note:	The algorithm in this routine is [basically] the same as for
+ *		H5VM_memcpyvv().  Changes should be made to both!
+ *
+ * Return:	Non-negative # of bytes operated on, on success/Negative on failure
+ *
+ * Programmer:	Quincey Koziol
+ *		Thursday, September 30, 2010
+ *
+ *-------------------------------------------------------------------------
+ */
+ssize_t
+H5VM_opvv(size_t dst_max_nseq, size_t *dst_curr_seq, size_t dst_len_arr[],
+    hsize_t dst_off_arr[],
+    size_t src_max_nseq, size_t *src_curr_seq, size_t src_len_arr[],
+    hsize_t src_off_arr[],
+    H5VM_opvv_func_t op, void *op_data)
+{
+    hsize_t *max_dst_off_ptr, *max_src_off_ptr;  /* Pointers to max. source and destination offset locations */
+    hsize_t *dst_off_ptr, *src_off_ptr; /* Pointers to source and destination offset arrays */
+    size_t *dst_len_ptr, *src_len_ptr;  /* Pointers to source and destination length arrays */
+    hsize_t tmp_dst_off, tmp_src_off;   /* Temporary source and destination offset values */
+    size_t tmp_dst_len, tmp_src_len;    /* Temporary source and destination length values */
+    size_t acc_len;             /* Accumulated length of sequences */
+    ssize_t ret_value = 0;      /* Return value (Total size of sequence in bytes) */
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity check */
+    HDassert(dst_curr_seq);
+    HDassert(*dst_curr_seq < dst_max_nseq);
+    HDassert(dst_len_arr);
+    HDassert(dst_off_arr);
+    HDassert(src_curr_seq);
+    HDassert(*src_curr_seq < src_max_nseq);
+    HDassert(src_len_arr);
+    HDassert(src_off_arr);
+    HDassert(op);
+
+    /* Set initial offset & length pointers */
+    dst_len_ptr = dst_len_arr + *dst_curr_seq;
+    dst_off_ptr = dst_off_arr + *dst_curr_seq;
+    src_len_ptr = src_len_arr + *src_curr_seq;
+    src_off_ptr = src_off_arr + *src_curr_seq;
+
+    /* Get temporary source & destination sequence offsets & lengths */
+    tmp_dst_len = *dst_len_ptr;
+    tmp_dst_off = *dst_off_ptr;
+    tmp_src_len = *src_len_ptr;
+    tmp_src_off = *src_off_ptr;
+
+    /* Compute maximum offset pointer values */
+    max_dst_off_ptr = dst_off_arr + dst_max_nseq;
+    max_src_off_ptr = src_off_arr + src_max_nseq;
+
+/* Work through the sequences */
+/* (Choose smallest sequence available initially) */
+
+    /* Source sequence is less than destination sequence */
+    if(tmp_src_len < tmp_dst_len) {
+src_smaller:
+        acc_len = 0;
+        do {
+            /* Make operator callback */
+            if((*op)(tmp_dst_off, tmp_src_off, tmp_src_len, op_data) < 0)
+                HGOTO_ERROR(H5E_INTERNAL, H5E_CANTOPERATE, FAIL, "can't perform operation")
+
+            /* Accumulate number of bytes copied */
+            acc_len += tmp_src_len;
+
+            /* Update destination length */
+            tmp_dst_off += tmp_src_len;
+            tmp_dst_len -= tmp_src_len;
+
+            /* Advance source offset & check for being finished */
+            src_off_ptr++;
+            if(src_off_ptr >= max_src_off_ptr) {
+                /* Roll accumulated changes into appropriate counters */
+                *dst_off_ptr = tmp_dst_off;
+                *dst_len_ptr = tmp_dst_len;
+
+                /* Done with sequences */
+                goto finished;
+            } /* end if */
+            tmp_src_off = *src_off_ptr;
+
+            /* Update source information */
+            src_len_ptr++;
+            tmp_src_len = *src_len_ptr;
+        } while(tmp_src_len < tmp_dst_len);
+
+        /* Roll accumulated sequence lengths into return value */
+        ret_value += (ssize_t)acc_len;
+
+        /* Transition to next state */
+        if(tmp_dst_len < tmp_src_len)
+            goto dst_smaller;
+        else
+            goto equal;
+    } /* end if */
+    /* Destination sequence is less than source sequence */
+    else if(tmp_dst_len < tmp_src_len) {
+dst_smaller:
+        acc_len = 0;
+        do {
+            /* Make operator callback */
+            if((*op)(tmp_dst_off, tmp_src_off, tmp_dst_len, op_data) < 0)
+                HGOTO_ERROR(H5E_INTERNAL, H5E_CANTOPERATE, FAIL, "can't perform operation")
+
+            /* Accumulate number of bytes copied */
+            acc_len += tmp_dst_len;
+
+            /* Update source length */
+            tmp_src_off += tmp_dst_len;
+            tmp_src_len -= tmp_dst_len;
+
+            /* Advance destination offset & check for being finished */
+            dst_off_ptr++;
+            if(dst_off_ptr >= max_dst_off_ptr) {
+                /* Roll accumulated changes into appropriate counters */
+                *src_off_ptr = tmp_src_off;
+                *src_len_ptr = tmp_src_len;
+
+                /* Done with sequences */
+                goto finished;
+            } /* end if */
+            tmp_dst_off = *dst_off_ptr;
+
+            /* Update destination information */
+            dst_len_ptr++;
+            tmp_dst_len = *dst_len_ptr;
+        } while(tmp_dst_len < tmp_src_len);
+
+        /* Roll accumulated sequence lengths into return value */
+        ret_value += (ssize_t)acc_len;
+
+        /* Transition to next state */
+        if(tmp_src_len < tmp_dst_len)
+            goto src_smaller;
+        else
+            goto equal;
+    } /* end else-if */
+    /* Destination sequence and source sequence are same length */
+    else {
+equal:
+        acc_len = 0;
+        do {
+            /* Make operator callback */
+            if((*op)(tmp_dst_off, tmp_src_off, tmp_dst_len, op_data) < 0)
+                HGOTO_ERROR(H5E_INTERNAL, H5E_CANTOPERATE, FAIL, "can't perform operation")
+
+            /* Accumulate number of bytes copied */
+            acc_len += tmp_dst_len;
+
+            /* Advance source & destination offset & check for being finished */
+            src_off_ptr++;
+            dst_off_ptr++;
+            if(src_off_ptr >= max_src_off_ptr || dst_off_ptr >= max_dst_off_ptr)
+                /* Done with sequences */
+                goto finished;
+            tmp_src_off = *src_off_ptr;
+            tmp_dst_off = *dst_off_ptr;
+
+            /* Update source information */
+            src_len_ptr++;
+            tmp_src_len = *src_len_ptr;
+
+            /* Update destination information */
+            dst_len_ptr++;
+            tmp_dst_len = *dst_len_ptr;
+        } while(tmp_dst_len == tmp_src_len);
+
+        /* Roll accumulated sequence lengths into return value */
+        ret_value += (ssize_t)acc_len;
+
+        /* Transition to next state */
+        if(tmp_dst_len < tmp_src_len)
+            goto dst_smaller;
+        else
+            goto src_smaller;
+    } /* end else */
+
+finished:
+    /* Roll accumulated sequence lengths into return value */
+    ret_value += (ssize_t)acc_len;
+
+    /* Update current sequence vectors */
+    *dst_curr_seq = (size_t)(dst_off_ptr - dst_off_arr);
+    *src_curr_seq = (size_t)(src_off_ptr - src_off_arr);
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VM_opvv() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5VM_memcpyvv
+ *
+ * Purpose:	Given source and destination buffers in memory (SRC & DST)
+ *              copy sequences of from the source buffer into the destination
+ *              buffer.  Each set of sequnces has an array of lengths, an
+ *              array of offsets, the maximum number of sequences and the
+ *              current sequence to start at in the sequence.
+ *
+ *              There may be different numbers of bytes in the source and
+ *              destination sequences, data copying stops when either the
+ *              source or destination buffer runs out of sequence information.
+ *
+ * Note:	The algorithm in this routine is [basically] the same as for
+ *		H5VM_opvv().  Changes should be made to both!
+ *
+ * Return:	Non-negative # of bytes copied on success/Negative on failure
+ *
+ * Programmer:	Quincey Koziol
+ *		Friday, May 2, 2003
+ *
+ *-------------------------------------------------------------------------
+ */
+ssize_t
+H5VM_memcpyvv(void *_dst,
+    size_t dst_max_nseq, size_t *dst_curr_seq, size_t dst_len_arr[], hsize_t dst_off_arr[],
+    const void *_src,
+    size_t src_max_nseq, size_t *src_curr_seq, size_t src_len_arr[], hsize_t src_off_arr[])
+{
+    unsigned char *dst;         /* Destination buffer pointer */
+    const unsigned char *src;   /* Source buffer pointer */
+    hsize_t *max_dst_off_ptr, *max_src_off_ptr;  /* Pointers to max. source and destination offset locations */
+    hsize_t *dst_off_ptr, *src_off_ptr;  /* Pointers to source and destination offset arrays */
+    size_t *dst_len_ptr, *src_len_ptr;  /* Pointers to source and destination length arrays */
+    size_t tmp_dst_len;         /* Temporary dest. length value */
+    size_t tmp_src_len;         /* Temporary source length value */
+    size_t acc_len;             /* Accumulated length of sequences */
+    ssize_t ret_value = 0;      /* Return value (Total size of sequence in bytes) */
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    /* Sanity check */
+    HDassert(_dst);
+    HDassert(dst_curr_seq);
+    HDassert(*dst_curr_seq < dst_max_nseq);
+    HDassert(dst_len_arr);
+    HDassert(dst_off_arr);
+    HDassert(_src);
+    HDassert(src_curr_seq);
+    HDassert(*src_curr_seq < src_max_nseq);
+    HDassert(src_len_arr);
+    HDassert(src_off_arr);
+
+    /* Set initial offset & length pointers */
+    dst_len_ptr = dst_len_arr + *dst_curr_seq;
+    dst_off_ptr = dst_off_arr + *dst_curr_seq;
+    src_len_ptr = src_len_arr + *src_curr_seq;
+    src_off_ptr = src_off_arr + *src_curr_seq;
+
+    /* Get temporary source & destination sequence lengths */
+    tmp_dst_len = *dst_len_ptr;
+    tmp_src_len = *src_len_ptr;
+
+    /* Compute maximum offset pointer values */
+    max_dst_off_ptr = dst_off_arr + dst_max_nseq;
+    max_src_off_ptr = src_off_arr + src_max_nseq;
+
+    /* Compute buffer offsets */
+    dst = (unsigned char *)_dst + *dst_off_ptr;
+    src = (const unsigned char *)_src + *src_off_ptr;
+
+/* Work through the sequences */
+/* (Choose smallest sequence available initially) */
+
+    /* Source sequence is less than destination sequence */
+    if(tmp_src_len < tmp_dst_len) {
+src_smaller:
+        acc_len = 0;
+        do {
+            /* Copy data */
+            HDmemcpy(dst, src, tmp_src_len);
+
+            /* Accumulate number of bytes copied */
+            acc_len += tmp_src_len;
+
+            /* Update destination length */
+            tmp_dst_len -= tmp_src_len;
+
+            /* Advance source offset & check for being finished */
+            src_off_ptr++;
+            if(src_off_ptr >= max_src_off_ptr) {
+                /* Roll accumulated changes into appropriate counters */
+                *dst_off_ptr += acc_len;
+                *dst_len_ptr = tmp_dst_len;
+
+                /* Done with sequences */
+                goto finished;
+            } /* end if */
+
+            /* Update destination pointer */
+            dst += tmp_src_len;
+
+            /* Update source information */
+            src_len_ptr++;
+            tmp_src_len = *src_len_ptr;
+            src = (const unsigned char *)_src + *src_off_ptr;
+        } while(tmp_src_len < tmp_dst_len);
+
+        /* Roll accumulated sequence lengths into return value */
+        ret_value += (ssize_t)acc_len;
+
+        /* Transition to next state */
+        if(tmp_dst_len < tmp_src_len)
+            goto dst_smaller;
+        else
+            goto equal;
+    } /* end if */
+    /* Destination sequence is less than source sequence */
+    else if(tmp_dst_len < tmp_src_len) {
+dst_smaller:
+        acc_len = 0;
+        do {
+            /* Copy data */
+            HDmemcpy(dst, src, tmp_dst_len);
+
+            /* Accumulate number of bytes copied */
+            acc_len += tmp_dst_len;
+
+            /* Update source length */
+            tmp_src_len -= tmp_dst_len;
+
+            /* Advance destination offset & check for being finished */
+            dst_off_ptr++;
+            if(dst_off_ptr >= max_dst_off_ptr) {
+                /* Roll accumulated changes into appropriate counters */
+                *src_off_ptr += acc_len;
+                *src_len_ptr = tmp_src_len;
+
+                /* Done with sequences */
+                goto finished;
+            } /* end if */
+
+            /* Update source pointer */
+            src += tmp_dst_len;
+
+            /* Update destination information */
+            dst_len_ptr++;
+            tmp_dst_len = *dst_len_ptr;
+            dst = (unsigned char *)_dst + *dst_off_ptr;
+        } while(tmp_dst_len < tmp_src_len);
+
+        /* Roll accumulated sequence lengths into return value */
+        ret_value += (ssize_t)acc_len;
+
+        /* Transition to next state */
+        if(tmp_src_len < tmp_dst_len)
+            goto src_smaller;
+        else
+            goto equal;
+    } /* end else-if */
+    /* Destination sequence and source sequence are same length */
+    else {
+equal:
+        acc_len = 0;
+        do {
+            /* Copy data */
+            HDmemcpy(dst, src, tmp_dst_len);
+
+            /* Accumulate number of bytes copied */
+            acc_len += tmp_dst_len;
+
+            /* Advance source & destination offset & check for being finished */
+            src_off_ptr++;
+            dst_off_ptr++;
+            if(src_off_ptr >= max_src_off_ptr || dst_off_ptr >= max_dst_off_ptr)
+                /* Done with sequences */
+                goto finished;
+
+            /* Update source information */
+            src_len_ptr++;
+            tmp_src_len = *src_len_ptr;
+            src = (const unsigned char *)_src + *src_off_ptr;
+
+            /* Update destination information */
+            dst_len_ptr++;
+            tmp_dst_len = *dst_len_ptr;
+            dst = (unsigned char *)_dst + *dst_off_ptr;
+        } while(tmp_dst_len == tmp_src_len);
+
+        /* Roll accumulated sequence lengths into return value */
+        ret_value += (ssize_t)acc_len;
+
+        /* Transition to next state */
+        if(tmp_dst_len < tmp_src_len)
+            goto dst_smaller;
+        else
+            goto src_smaller;
+    } /* end else */
+
+finished:
+    /* Roll accumulated sequence lengths into return value */
+    ret_value += (ssize_t)acc_len;
+
+    /* Update current sequence vectors */
+    *dst_curr_seq = (size_t)(dst_off_ptr - dst_off_arr);
+    *src_curr_seq = (size_t)(src_off_ptr - src_off_arr);
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VM_memcpyvv() */
+