X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbespill.c;h=2746cb042f720e34510148de38fd997bf63eb7d2;hb=6e96ec2cff42d9e59757d486e9b64b8f3bdb1704;hp=6feadd91c6bef01d8a94f844fcc8d10c0eca091f;hpb=3b0e3f49355079844d87dc1ccb46a39adbc2bd95;p=libfirm

diff --git a/ir/be/bespill.c b/ir/be/bespill.c
index 6feadd91c..2746cb042 100644
--- a/ir/be/bespill.c
+++ b/ir/be/bespill.c
@@ -24,9 +24,7 @@
  * @date		29.09.2005
  * @version     $Id$
  */
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
 
 #include <stdlib.h>
 #include <stdbool.h>
@@ -485,7 +483,7 @@ static void spill_phi(spill_env_t *env, spill_info_t *spillinfo)
 
 	/* build a new PhiM */
 	arity   = get_irn_arity(phi);
-	ins     = alloca(sizeof(ir_node*) * arity);
+	ins     = ALLOCAN(ir_node*, arity);
 	unknown = new_r_Unknown(irg, mode_M);
 	for(i = 0; i < arity; ++i) {
 		ins[i] = unknown;
@@ -564,39 +562,19 @@ static int is_value_available(spill_env_t *env, const ir_node *arg,
 	if(arg == get_irg_frame(env->irg))
 		return 1;
 
+#if 0
 	/* hack for now (happens when command should be inserted at end of block) */
-	if(is_Block(reloader)) {
+	if(is_Block(reloader))
 		return 0;
-	}
+#else
+	(void)reloader;
+#endif
 
 	/*
 	 * Ignore registers are always available
 	 */
-	if (arch_irn_is(arg, ignore)) {
-		return 1;
-	}
-
- 	/* the following test does not work while spilling,
-	 * because the liveness info is not adapted yet to the effects of the
-	 * additional spills/reloads.
-	 */
-#if 0
-	/* we want to remat before the insn reloader
-	 * thus an arguments is alive if
-	 *   - it interferes with the reloaders result
-	 *   - or it is (last-) used by reloader itself
-	 */
-	if (values_interfere(env->birg->lv, reloader, arg)) {
+	if (arch_irn_is_ignore(arg))
 		return 1;
-	}
-
-	arity = get_irn_arity(reloader);
-	for (i = 0; i < arity; ++i) {
-		ir_node *rel_arg = get_irn_n(reloader, i);
-		if (rel_arg == arg)
-			return 1;
-	}
-#endif
 
  	return 0;
 }
@@ -642,6 +620,10 @@ static int check_remat_conditions_costs(spill_env_t *env,
 	if(parentcosts + costs >= env->reload_cost + env->spill_cost) {
 		return REMAT_COST_INFINITE;
 	}
+	/* never rematerialize a node which modifies the flags.
+	 * (would be better to test wether the flags are actually live at point
+	 * reloader...)
+	 */
 	if (arch_irn_is(spilled, modify_flags)) {
 		return REMAT_COST_INFINITE;
 	}
@@ -691,7 +673,7 @@ static ir_node *do_remat(spill_env_t *env, ir_node *spilled, ir_node *reloader)
 		bl = get_nodes_block(reloader);
 	}
 
-	ins = alloca(get_irn_arity(spilled) * sizeof(ins[0]));
+	ins = ALLOCAN(ir_node*, get_irn_arity(spilled));
 	for(i = 0, arity = get_irn_arity(spilled); i < arity; ++i) {
 		ir_node *arg = get_irn_n(spilled, i);
 
@@ -837,7 +819,7 @@ static void determine_spill_costs(spill_env_t *env, spill_info_t *spillinfo)
 		spill_t *s;
 		double   spills_execfreq;
 
-		/* calculate sum of executaion frequencies of individual spills */
+		/* calculate sum of execution frequencies of individual spills */
 		spills_execfreq = 0;
 		s               = spillinfo->spills;
 		for( ; s != NULL; s = s->next) {