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-rw-r--r--src/H5Shyper.c134
1 files changed, 85 insertions, 49 deletions
diff --git a/src/H5Shyper.c b/src/H5Shyper.c
index 1f56737..48f1064 100644
--- a/src/H5Shyper.c
+++ b/src/H5Shyper.c
@@ -8420,18 +8420,16 @@ H5S_hyper_get_seq_list_single(const H5S_t *space, H5S_sel_iter_t *iter,
hsize_t base_offset[H5O_LAYOUT_NDIMS]; /* Base coordinate offset in dataspace */
hsize_t offset[H5O_LAYOUT_NDIMS]; /* Coordinate offset in dataspace */
hsize_t slab[H5O_LAYOUT_NDIMS]; /* Hyperslab size */
- hsize_t skip[H5O_LAYOUT_NDIMS]; /* Bytes to skip between blocks */
hsize_t fast_dim_block; /* Local copies of fastest changing dimension info */
hsize_t acc; /* Accumulator */
hsize_t loc; /* Coordinate offset */
size_t tot_blk_count; /* Total number of blocks left to output */
- size_t blk_count; /* Total number of blocks left to output */
size_t elem_size; /* Size of each element iterating over */
size_t io_left; /* The number of elements left in I/O operation */
size_t actual_elem; /* The actual number of elements to count */
unsigned ndims; /* Number of dimensions of dataset */
unsigned fast_dim; /* Rank of the fastest changing dimension for the dataspace */
- int temp_dim; /* Temporary rank holder */
+ unsigned skip_dim; /* Rank of the dimension to skip along */
unsigned u; /* Local index variable */
int i; /* Local index variable */
@@ -8454,7 +8452,6 @@ H5S_hyper_get_seq_list_single(const H5S_t *space, H5S_sel_iter_t *iter,
if(iter->u.hyp.iter_rank != 0 && iter->u.hyp.iter_rank < space->extent.rank) {
/* Set the aliases for a few important dimension ranks */
ndims = iter->u.hyp.iter_rank;
- fast_dim = ndims - 1;
/* Set the local copy of the selection offset */
sel_off = iter->u.hyp.sel_off;
@@ -8465,7 +8462,6 @@ H5S_hyper_get_seq_list_single(const H5S_t *space, H5S_sel_iter_t *iter,
else {
/* Set the aliases for a few important dimension ranks */
ndims = space->extent.rank;
- fast_dim = ndims - 1;
/* Set the local copy of the selection offset */
sel_off = space->select.offset;
@@ -8473,6 +8469,7 @@ H5S_hyper_get_seq_list_single(const H5S_t *space, H5S_sel_iter_t *iter,
/* Set up the pointer to the size of the memory space */
mem_size = space->extent.size;
} /* end else */
+ fast_dim = ndims - 1;
/* initialize row sizes for each dimension */
elem_size = iter->elmt_size;
@@ -8481,10 +8478,6 @@ H5S_hyper_get_seq_list_single(const H5S_t *space, H5S_sel_iter_t *iter,
acc *= mem_size[i];
} /* end for */
- /* Compute the amount to skip between sequences */
- for(u = 0; u < ndims; u++)
- skip[u] = (mem_size[u] - tdiminfo[u].block) * slab[u];
-
/* Copy the base location of the block */
/* (Add in the selection offset) */
for(u = 0; u < ndims; u++)
@@ -8518,16 +8511,11 @@ H5S_hyper_get_seq_list_single(const H5S_t *space, H5S_sel_iter_t *iter,
/* Check for blocks to operate on */
if(tot_blk_count > 0) {
- hsize_t tmp_block[H5O_LAYOUT_NDIMS];/* Temporary block offset */
size_t actual_bytes; /* The actual number of bytes to copy */
/* Set the number of actual bytes */
actual_bytes = actual_elem * elem_size;
- /* Set the starting block location */
- for(u = 0; u < ndims; u++)
- tmp_block[u] = iter->u.hyp.off[u] - tdiminfo[u].start;
-
/* Check for 1-dim selection */
if(0 == fast_dim) {
/* Sanity checks */
@@ -8539,53 +8527,101 @@ H5S_hyper_get_seq_list_single(const H5S_t *space, H5S_sel_iter_t *iter,
*len++ = actual_bytes;
} /* end if */
else {
- /* Create sequences until an entire row can't be used */
- blk_count = tot_blk_count;
- while(blk_count > 0) {
- /* Store the sequence information */
- *off++ = loc;
- *len++ = actual_bytes;
-
- /* Set temporary dimension for advancing offsets */
- temp_dim = (int)fast_dim - 1;
+ hsize_t skip_slab; /* Temporary copy of slab[fast_dim - 1] */
+ size_t blk_count; /* Total number of blocks left to output */
+
+ /* Find first dimension w/block >1 */
+ skip_dim = fast_dim;
+ for(i = (int)(fast_dim - 1); i >= 0; i--)
+ if(tdiminfo[i].block > 1) {
+ skip_dim = (unsigned)i;
+ break;
+ } /* end if */
+ skip_slab = slab[skip_dim];
+
+ /* Check for being able to use fast algorithm for 1-D */
+ if(0 == skip_dim) {
+ /* Create sequences until an entire row can't be used */
+ blk_count = tot_blk_count;
+ while(blk_count > 0) {
+ /* Store the sequence information */
+ *off++ = loc;
+ *len++ = actual_bytes;
+
+ /* Increment offset in destination buffer */
+ loc += skip_slab;
+
+ /* Decrement block count */
+ blk_count--;
+ } /* end while */
- /* Increment offset in destination buffer */
- loc += slab[temp_dim];
+ /* Move to the next location */
+ offset[skip_dim] += tot_blk_count;
+ } /* end if */
+ else {
+ hsize_t tmp_block[H5O_LAYOUT_NDIMS];/* Temporary block offset */
+ hsize_t skip[H5O_LAYOUT_NDIMS]; /* Bytes to skip between blocks */
+ int temp_dim; /* Temporary rank holder */
- /* Increment the offset and count for the other dimensions */
- while(temp_dim >= 0) {
- /* Move to the next row in the curent dimension */
- offset[temp_dim]++;
- tmp_block[temp_dim]++;
+ /* Set the starting block location */
+ for(u = 0; u < ndims; u++)
+ tmp_block[u] = iter->u.hyp.off[u] - tdiminfo[u].start;
- /* If this block is still in the range of blocks to output for the dimension, break out of loop */
- if(tmp_block[temp_dim] < tdiminfo[temp_dim].block)
- break;
- else {
- offset[temp_dim] = base_offset[temp_dim];
- loc += skip[temp_dim];
- tmp_block[temp_dim] = 0;
- } /* end else */
+ /* Compute the amount to skip between sequences */
+ for(u = 0; u < ndims; u++)
+ skip[u] = (mem_size[u] - tdiminfo[u].block) * slab[u];
- /* Decrement dimension count */
- temp_dim--;
- } /* end while */
+ /* Create sequences until an entire row can't be used */
+ blk_count = tot_blk_count;
+ while(blk_count > 0) {
+ /* Store the sequence information */
+ *off++ = loc;
+ *len++ = actual_bytes;
- /* Decrement block count */
- blk_count--;
- } /* end while */
+ /* Set temporary dimension for advancing offsets */
+ temp_dim = (int)skip_dim;
+
+ /* Increment offset in destination buffer */
+ loc += skip_slab;
+
+ /* Increment the offset and count for the other dimensions */
+ while(temp_dim >= 0) {
+ /* Move to the next row in the curent dimension */
+ offset[temp_dim]++;
+ tmp_block[temp_dim]++;
+
+ /* If this block is still in the range of blocks to output for the dimension, break out of loop */
+ if(tmp_block[temp_dim] < tdiminfo[temp_dim].block)
+ break;
+ else {
+ offset[temp_dim] = base_offset[temp_dim];
+ loc += skip[temp_dim];
+ tmp_block[temp_dim] = 0;
+ } /* end else */
+
+ /* Decrement dimension count */
+ temp_dim--;
+ } /* end while */
+
+ /* Decrement block count */
+ blk_count--;
+ } /* end while */
+ } /* end else */
} /* end else */
/* Update the iterator, if there were any blocks used */
- /* Update the iterator with the location we stopped */
- /* (Subtract out the selection offset) */
- for(u = 0; u < ndims; u++)
- iter->u.hyp.off[u] = (hsize_t)((hssize_t)offset[u] - sel_off[u]);
-
/* Decrement the number of elements left in selection */
iter->elmt_left -= tot_blk_count * actual_elem;
+ /* Check if there are elements left in iterator */
+ if(iter->elmt_left > 0) {
+ /* Update the iterator with the location we stopped */
+ /* (Subtract out the selection offset) */
+ for(u = 0; u < ndims; u++)
+ iter->u.hyp.off[u] = (hsize_t)((hssize_t)offset[u] - sel_off[u]);
+ } /* end if */
+
/* Increment the number of sequences generated */
*nseq += tot_blk_count;