In some cases, code will write to multiple indexes of an array before reading from them. Our SSA implementation does not differentiate between different indices and thus renames the array at each write. This means all array writes except the last one will have no reads. This is a unique case because multiple writes to different array indices do not make previous writes useless, as happens with non-array variables.
Example:
In Update_Sources(), sources_dw is an array.
sources_dw[0] gets written to and then sources_dw[1] gets written to.
The second write renames sources_dw in the first write, creating two separate dataspace nodes. The first node, however has no reads despite the fact that soures_dw[0] is read from. This is a bug.
In some cases, code will write to multiple indexes of an array before reading from them. Our SSA implementation does not differentiate between different indices and thus renames the array at each write. This means all array writes except the last one will have no reads. This is a unique case because multiple writes to different array indices do not make previous writes useless, as happens with non-array variables.
Example: In
Update_Sources(),sources_dwis an array.sources_dw[0]gets written to and thensources_dw[1]gets written to. The second write renamessources_dwin the first write, creating two separate dataspace nodes. The first node, however has no reads despite the fact thatsoures_dw[0]is read from. This is a bug.