X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbeconstrperm.c;h=bfb1fe94a09a96f08449debaa67f18e9a264b1aa;hb=f5a1564c99cbdfc8d4773385beeb10f45a989755;hp=e7e16a706120635fe1658dc6685cae6a62e541e0;hpb=b4677f5bb0e1cf6934b883d5c841de3490930bbd;p=libfirm

diff --git a/ir/be/beconstrperm.c b/ir/be/beconstrperm.c
index e7e16a706..bfb1fe94a 100644
--- a/ir/be/beconstrperm.c
+++ b/ir/be/beconstrperm.c
@@ -14,29 +14,65 @@
 #include "irgwalk.h"
 
 #include "bearch.h"
+#include "belive_t.h"
 #include "benode_t.h"
 #include "besched_t.h"
 #include "beconstrperm.h"
 
-static void walker_insert_constr_perms(ir_node *irn, void *env) {
+static void walker_insert_constr_perms(ir_node *bl, void *env) {
+	ir_node *irn;
 	be_chordal_env_t *cenv = env;
 	const be_main_env_t *menv = cenv->main_env;
 	const arch_env_t *aenv = menv->arch_env;
 	arch_register_req_t req;
 	int pos, max;
 
-	/* check for a restriction of the result (-1) and the operands (0..n) */
-	max = get_irn_arity(irn);
-	for(pos=-1; pos<max; ++pos) {
-		arch_get_register_req(aenv, &req, irn, pos);
-		/* if a restriction is found, insert a perm before the irn */
-		if (req.type == arch_register_req_type_limited) {
-			insert_Perm_after(menv, cenv->cls, cenv->dom_front, sched_prev(irn));
-			break;
+	sched_foreach(bl, irn) {
+		ir_node *perm = NULL;
+
+		/* check for a restriction of the result (-1) or one of the operands (0..n) */
+		max = get_irn_arity(irn);
+		for(pos=-1; pos<max; ++pos) {
+			arch_get_register_req(aenv, &req, irn, pos);
+			/* if a restriction is found, insert a perm before the irn */
+			if (cenv->cls == arch_get_irn_reg_class(aenv, irn, pos) && req.type == arch_register_req_type_limited) {
+
+				if(!perm)
+					perm = insert_Perm_after(menv, cenv->cls, cenv->dom_front, sched_prev(irn));
+
+				/*
+				 * Turn an input constraint into an output constraint:
+				 * The Proj of the Perm which corresponds to the input
+				 * constraint will have the input constraint of the node
+				 * as an output constraint
+				 */
+				if(pos >= 0) {
+					ir_node *op = get_irn_n(irn, pos);
+
+					/*
+					 * The operand must be a proj now, since a perm cut
+					 * all live ranges.
+					 */
+					assert(is_Proj(op));
+					be_set_Perm_out_req(perm, get_Proj_proj(op), &req);
+				}
+			}
 		}
+
+		/*
+		 * If we inserted a perm,
+		 * we have to recompute liveness analysis since inserting
+		 * a Perm changes the liveness situation at the end
+		 * of the block.
+		 * (its needed by successive calls to insert_Perm_after)
+		 * Perhaps thinking about an online liveness analysis
+		 * would help.
+		 */
+		if(perm)
+			be_liveness(get_irn_irg(bl));
 	}
 }
 
 void be_insert_constr_perms(be_chordal_env_t *cenv) {
-	irg_walk_graph(cenv->irg, walker_insert_constr_perms, NULL, cenv);
+	irg_block_walk_graph(cenv->irg, walker_insert_constr_perms, NULL, cenv);
 }