removed union from register requirements to make static inits easier

[libfirm] / ir / be / beconstrperm.c

diff --git a/ir/be/beconstrperm.c b/ir/be/beconstrperm.c
index e7e16a7..d6d9821 100644 (file)
--- a/ir/be/beconstrperm.c
+++ b/ir/be/beconstrperm.c
@@ -1,5 +1,5 @@
 /**
- * Author:      Daniel Grund
+ * Author:      Daniel Grund, Sebastian Hack
  * Date:               15.12.2005
  * Copyright:   (c) Universitaet Karlsruhe
  * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
@@ -14,29 +14,80 @@
 #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) {
-       be_chordal_env_t *cenv = env;
+static void check_constraints(const be_chordal_env_t *cenv, ir_node *base, ir_node *irn, ir_node **perm)
+{
+       const arch_env_t *aenv    = cenv->main_env->arch_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;
+       int pos, n;
 
-       /* check for a restriction of the result (-1) and the operands (0..n) */
-       max = get_irn_arity(irn);
-       for(pos=-1; pos<max; ++pos) {
+       assert(is_Proj(irn) || (base == irn));
+
+       for(pos = -1, n = get_irn_arity(irn); pos < n; ++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;
+
+               if(arch_irn_has_reg_class(aenv, irn, pos, cenv->cls) && req.type == arch_register_req_type_limited) {
+
+               /*
+               * 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 == NULL) {
+                               *perm = insert_Perm_after(menv, cenv->cls, cenv->dom_front, sched_prev(base));
+                               be_liveness(cenv->irg);
+                       }
+
+                       /*
+                       * 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);
+                       }
+               }
+       }
+}
+
+static void walker_insert_constr_perms(ir_node *bl, void *env) {
+       be_chordal_env_t *cenv    = env;
+       ir_node *irn;
+
+       for(irn = sched_first(bl); !sched_is_end(irn); irn = sched_next(irn)) {
+               ir_node *perm = NULL;
+
+               if(get_irn_mode(irn) == mode_T) {
+                       ir_node *proj;
+
+                       for(proj = sched_next(irn); is_Proj(proj); proj = sched_next(proj))
+                               check_constraints(cenv, irn, proj, &perm);
+
+                       irn = sched_prev(proj);
                }
+
+               else
+                       check_constraints(cenv, irn, irn, &perm);
        }
 }
 
 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);
 }