- moved peephole_IncSP_IncSP() to bepeephole.c, as this is a generic function and...

[libfirm] / ir / be / bepeephole.c

diff --git a/ir/be/bepeephole.c b/ir/be/bepeephole.c
index d237790..3194b4b 100644 (file)
--- a/ir/be/bepeephole.c
+++ b/ir/be/bepeephole.c
@@ -261,6 +261,58 @@ static void        kill_barriers(ir_graph *irg) {
        skip_barrier(start_blk, irg);
 }
 
+/*
+ * Tries to optimize a beIncSp node with it's previous IncSP node.
+ * Must be run from a be_peephole_opt() context.
+ */
+void be_peephole_IncSP_IncSP(ir_node *node)
+{
+       int      pred_offs;
+       int      curr_offs;
+       int      offs;
+       ir_node *pred = be_get_IncSP_pred(node);
+       ir_node *predpred;
+
+       if (!be_is_IncSP(pred))
+               return;
+
+       if (get_irn_n_edges(pred) > 1)
+               return;
+
+       pred_offs = be_get_IncSP_offset(pred);
+       curr_offs = be_get_IncSP_offset(node);
+
+       if (pred_offs == BE_STACK_FRAME_SIZE_EXPAND) {
+               if (curr_offs != BE_STACK_FRAME_SIZE_SHRINK) {
+                       return;
+               }
+               offs = 0;
+       } else if (pred_offs == BE_STACK_FRAME_SIZE_SHRINK) {
+               if (curr_offs != BE_STACK_FRAME_SIZE_EXPAND) {
+                       return;
+               }
+               offs = 0;
+       } else if (curr_offs == BE_STACK_FRAME_SIZE_EXPAND ||
+                  curr_offs == BE_STACK_FRAME_SIZE_SHRINK) {
+               return;
+       } else {
+               offs = curr_offs + pred_offs;
+       }
+
+       /* add pred offset to ours and remove pred IncSP */
+       be_set_IncSP_offset(node, offs);
+
+       predpred = be_get_IncSP_pred(pred);
+       be_peephole_before_exchange(pred, predpred);
+
+       /* rewire dependency edges */
+       edges_reroute_kind(pred, predpred, EDGE_KIND_DEP, current_ir_graph);
+       be_set_IncSP_pred(node, predpred);
+       sched_remove(pred);
+       be_kill_node(pred);
+
+       be_peephole_after_exchange(predpred);
+}
 
 void be_peephole_opt(be_irg_t *birg)
 {