diff options
Diffstat (limited to 'src/H5VM.c')
| -rw-r--r-- | src/H5VM.c | 83 |
1 files changed, 75 insertions, 8 deletions
@@ -1258,18 +1258,83 @@ done: * The chunk index is placed in the CHUNK_IDX location for return * from this function * - * Return: Non-negative on success/Negative on failure + * Return: Chunk index on success (can't fail) * * Programmer: Quincey Koziol * Monday, April 21, 2003 * *------------------------------------------------------------------------- */ -herr_t +hsize_t H5VM_chunk_index(unsigned ndims, const hsize_t *coord, const uint32_t *chunk, - const hsize_t *down_nchunks, hsize_t *chunk_idx) + const hsize_t *down_nchunks) { hsize_t scaled_coord[H5VM_HYPER_NDIMS]; /* Scaled, coordinates, in terms of chunks */ + hsize_t chunk_idx; /* Chunk index computed */ + + FUNC_ENTER_NOAPI_NOINIT_NOERR + + /* Sanity check */ + HDassert(ndims <= H5VM_HYPER_NDIMS); + HDassert(coord); + HDassert(chunk); + HDassert(down_nchunks); + + /* Defer to H5VM_chunk_index_scaled */ + chunk_idx = H5VM_chunk_index_scaled(ndims, coord, chunk, down_nchunks, scaled_coord); + + FUNC_LEAVE_NOAPI(chunk_idx) +} /* end H5VM_chunk_index() */ + + +/*------------------------------------------------------------------------- + * Function: H5VM_chunk_index_scaled + * + * 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 + * + * Note: This routine is identical to H5VM_chunk_index(), except for + * caching the scaled information. Make changes in both places. + * + * Return: Chunk index on success (can't fail) + * + * Programmer: Vailin Choi + * Monday, February 9, 2015 + * + *------------------------------------------------------------------------- + */ +hsize_t +H5VM_chunk_index_scaled(unsigned ndims, const hsize_t *coord, const uint32_t *chunk, + const hsize_t *down_nchunks, hsize_t *scaled) +{ + hsize_t chunk_idx; /* Computed chunk index */ unsigned u; /* Local index variable */ FUNC_ENTER_NOAPI_NOINIT_NOERR @@ -1278,17 +1343,19 @@ H5VM_chunk_index(unsigned ndims, const hsize_t *coord, const uint32_t *chunk, HDassert(ndims <= H5VM_HYPER_NDIMS); HDassert(coord); HDassert(chunk); - HDassert(chunk_idx); + HDassert(down_nchunks); + HDassert(scaled); /* Compute the scaled coordinates for actual coordinates */ + /* (Note that the 'scaled' array is an 'OUT' parameter) */ for(u = 0; u < ndims; u++) - scaled_coord[u] = coord[u] / chunk[u]; + scaled[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 */ + chunk_idx = H5VM_array_offset_pre(ndims, down_nchunks, scaled); /*lint !e772 scaled_coord will always be initialized */ - FUNC_LEAVE_NOAPI(SUCCEED) -} /* end H5VM_chunk_index() */ + FUNC_LEAVE_NOAPI(chunk_idx) +} /* end H5VM_chunk_index_scaled() */ /*------------------------------------------------------------------------- |