added a few benchmarks/testapps from http://shootout.alioth.debian.org

[libfirm] / ir / be / beirgmod.c

diff --git a/ir/be/beirgmod.c b/ir/be/beirgmod.c
index b67f437..45db095 100644 (file)
--- a/ir/be/beirgmod.c
+++ b/ir/be/beirgmod.c
@@ -601,3 +601,50 @@ void extreme_liverange_splitting(struct _be_chordal_env_t *cenv)
        be_liveness_recompute(cenv->lv);
        obstack_free(&c.obst, NULL);
 }
+
+static void remove_empty_block(ir_node *block, void *data) {
+       ir_graph *irg;
+       const ir_edge_t *edge, *next;
+       ir_node *node;
+       ir_node *jump = NULL;
+
+       assert(is_Block(block));
+
+       if(get_Block_n_cfgpreds(block) != 1)
+               return;
+
+       sched_foreach(block, node) {
+               if(!is_Jmp(node))
+                       return;
+               if(jump != NULL) {
+                       // we should never have 2 jumps in a block
+                       assert(0);
+                       return;
+               }
+               jump = node;
+       }
+       if(jump == NULL)
+               return;
+
+       node = get_Block_cfgpred(block, 0);
+       foreach_out_edge_safe(jump, edge, next) {
+               ir_node *block = get_edge_src_irn(edge);
+               int pos = get_edge_src_pos(edge);
+
+               set_irn_n(block, pos, node);
+       }
+
+       set_Block_cfgpred(block, 0, new_Bad());
+       sched_remove(jump);
+
+       irg = get_irn_irg(block);
+       set_irg_doms_inconsistent(irg);
+       set_irg_extblk_inconsistent(irg);
+}
+
+/**
+ * removes basic blocks that just contain a jump instruction
+ */
+void be_remove_empty_blocks(ir_graph *irg) {
+       irg_block_walk_graph(irg, remove_empty_block, NULL, NULL);
+}