Move checking for zero offset in selection adjust calls to the selection callbacks. This makes the

procedure for checking it consistent across selection types and between
_s and _u, ensures it is always is performed even when called within the H5S package, and removes the redundant check that would occur when callins H5S_select_adjust_s() from outside the H5S package.

1 files changed, 33 insertions, 22 deletions

diff --git a/src/H5Shyper.c b/src/H5Shyper.c
index a76812d..ab06eff 100644
--- a/src/H5Shyper.c
+++ b/src/H5Shyper.c
@@ -6477,39 +6477,50 @@ H5S__hyper_adjust_u_helper(H5S_hyper_span_info_t *spans, unsigned rank,
 static herr_t
 H5S__hyper_adjust_u(H5S_t *space, const hsize_t *offset)
 {
+    hbool_t non_zero_offset = FALSE;    /* Whether any offset is non-zero */
+    unsigned u;                         /* Local index variable */
+
     FUNC_ENTER_STATIC_NOERR
 
     /* Sanity check */
     HDassert(space);
     HDassert(offset);
 
-    /* Subtract the offset from the "regular" coordinates, if they exist */
-    /* (No need to rebuild the dimension info yet -QAK) */
-    if(space->select.sel_info.hslab->diminfo_valid == H5S_DIMINFO_VALID_YES) {
-        unsigned u;                         /* Local index variable */
+    /* Check for an all-zero offset vector */
+    for(u = 0; u < space->extent.rank; u++)
+        if(0 != offset[u]) {
+            non_zero_offset = TRUE;
+            break;
+        } /* end if */
 
-        for(u = 0; u < space->extent.rank; u++) {
-            HDassert(space->select.sel_info.hslab->diminfo.opt[u].start >= offset[u]);
-            space->select.sel_info.hslab->diminfo.opt[u].start -= offset[u];
+    /* Only perform operation if the offset is non-zero */
+    if(non_zero_offset) {
+        /* Subtract the offset from the "regular" coordinates, if they exist */
+        /* (No need to rebuild the dimension info yet -QAK) */
+        if(space->select.sel_info.hslab->diminfo_valid == H5S_DIMINFO_VALID_YES) {
+            for(u = 0; u < space->extent.rank; u++) {
+                HDassert(space->select.sel_info.hslab->diminfo.opt[u].start >= offset[u]);
+                space->select.sel_info.hslab->diminfo.opt[u].start -= offset[u];
 
-            /* Adjust the low & high bounds */
-            HDassert(space->select.sel_info.hslab->diminfo.low_bounds[u] >= offset[u]);
-            space->select.sel_info.hslab->diminfo.low_bounds[u] -= offset[u];
-            space->select.sel_info.hslab->diminfo.high_bounds[u] -= offset[u];
-        } /* end for */
-    } /* end if */
+                /* Adjust the low & high bounds */
+                HDassert(space->select.sel_info.hslab->diminfo.low_bounds[u] >= offset[u]);
+                space->select.sel_info.hslab->diminfo.low_bounds[u] -= offset[u];
+                space->select.sel_info.hslab->diminfo.high_bounds[u] -= offset[u];
+            } /* end for */
+        } /* end if */
 
-    /* Subtract the offset from the span tree coordinates, if they exist */
-    if(space->select.sel_info.hslab->span_lst) {
-        uint64_t op_gen;            /* Operation generation value */
+        /* Subtract the offset from the span tree coordinates, if they exist */
+        if(space->select.sel_info.hslab->span_lst) {
+            uint64_t op_gen;            /* Operation generation value */
 
-        /* Acquire an operation generation value for this operation */
-        op_gen = H5S__hyper_get_op_gen();
+            /* Acquire an operation generation value for this operation */
+            op_gen = H5S__hyper_get_op_gen();
 
-        /* Perform adjustment */
-        /* Always use op_info[0] since we own this op_info, so there can be no
-         * simultaneous operations */
-        H5S__hyper_adjust_u_helper(space->select.sel_info.hslab->span_lst, space->extent.rank, offset, 0, op_gen);
+            /* Perform adjustment */
+            /* Always use op_info[0] since we own this op_info, so there can be no
+             * simultaneous operations */
+            H5S__hyper_adjust_u_helper(space->select.sel_info.hslab->span_lst, space->extent.rank, offset, 0, op_gen);
+        } /* end if */
     } /* end if */
 
     FUNC_LEAVE_NOAPI(SUCCEED)