On Sat, 2004-05-22 at 09:06, Daniel Berlin wrote:
This speeds up SSA-CCP by moving more things to VARYING in one step
instead of two.
Kenneth Zadeck said it was worth about 30-40% performance in their
compiler.
SSA-CCP is already fast in our compiler, but it can't hurt to make it
faster (this patch can't ever slow it down, since it can only lessen
the number of iterations it takes to finish the algorithm, not
increase
it).
2004-05-22 Daniel Berlin <dberlin@dberlin.org>
Kenneth Zadeck <zadeck@naturalbridge.com>
* tree-ssa-ccp.c (varying_ssa_edges): New worklist.
(add_var_to_ssa_edges_worklist): Add value argument.
Update callers.
Use new worklist.
(tree_ssa_ccp): Use new worklist.
It looks good. Some questions before adding it:
1. Please factor out the loop that goes through the edge lists, so
that the main iteration loop in tree_ssa_ccp() calls
process_edge_list (ssa_edges) and process_edge_list
(varying_ssa_edges).