added register pressure analysis in loops

ir/be/Makefile.in

@@ -39,7 +39,7 @@ SOURCES += 	Makefile.in besched.h belistsched.h belistsched.c \
 	bestatevent.h bestatevent.c be_dbgout.h bestabs.c beschedrss.c \
 	beblocksched.h beblocksched.c bespilloptions.c bespilloptions.h \
 	beilpsched.c beilpsched.h bemachine.c bemachine.h \
-	bemodule.c bemodule.h
+	bemodule.c bemodule.h beloopana.c beloopana.h
 
 
 include $(topdir)/MakeRules

ir/be/beloopana.c

+/**
+ * Author:      Christian Wuerdig
+ * Date:        2007/02/19
+ * Copyright:   (c) Universitaet Karlsruhe
+ * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
+ * CVS-Id:      $Id$
+ *
+ * Compute register pressure in loops
+ */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "set.h"
+#include "pset.h"
+#include "irnode.h"
+#include "irtools.h"
+#include "irloop_t.h"
+
+#include "bearch.h"
+#include "belive.h"
+#include "besched.h"
+#include "beloopana.h"
+
+typedef struct _be_loop_info_t {
+	ir_loop                     *loop;
+	const arch_register_class_t *cls;
+	unsigned                    max_pressure;
+} be_loop_info_t;
+
+struct _be_loopana_t {
+	set      *data;
+	be_irg_t *birg;
+	DEBUG_ONLY(firm_dbg_module_t *dbg);
+};
+
+static int cmp_loop_info(const void *a, const void *b, size_t sz) {
+	const be_loop_info_t *i1 = a;
+	const be_loop_info_t *i2 = b;
+
+	return ! (i1->loop == i2->loop && i1->cls == i2->cls);
+}
+
+/**
+ * Compute the highest register pressure in a block.
+ * @param loop_ana  The loop ana object.
+ * @param block     The block to compute pressure for.
+ * @param cls       The register class to compute pressure for.
+ * @return The highest register pressure in the given block.
+ */
+static unsigned be_compute_block_pressure(be_loopana_t *loop_ana, ir_node *block, const arch_register_class_t *cls) {
+	const arch_env_t *aenv       = loop_ana->birg->main_env->arch_env;
+	pset             *live_nodes = pset_new_ptr_default();
+	ir_node          *irn;
+	int              max_live;
+
+	/* determine largest pressure with this block */
+	live_nodes = be_liveness_end_of_block(loop_ana->birg->lv, aenv, cls, block, live_nodes);
+	max_live   = pset_count(live_nodes);
+
+	sched_foreach_reverse(block, irn) {
+		int cnt;
+
+		if (is_Phi(irn))
+			break;
+
+		live_nodes = be_liveness_transfer(aenv, cls, irn, live_nodes);
+		cnt        = pset_count(live_nodes);
+		max_live   = MAX(cnt, max_live);
+	}
+
+	del_pset(live_nodes);
+	return max_live;
+}
+
+/**
+ * Compute the highest register pressure in a loop and it's sub-loops.
+ * @param loop_ana  The loop ana object.
+ * @param loop      The loop to compute pressure for.
+ * @param cls       The register class to compute pressure for.
+ * @return The highest register pressure in the given loop.
+ */
+static unsigned be_compute_loop_pressure(be_loopana_t *loop_ana, ir_loop *loop, const arch_register_class_t *cls) {
+	int i, max, pressure;
+	be_loop_info_t *entry, key;
+
+	DBG((loop_ana->dbg, LEVEL_1, "Processing Loop %d\n", loop->loop_nr));
+	assert(get_loop_n_elements(loop) > 0);
+	pressure = 0;
+
+	/* determine maximal pressure in all loop elements */
+	for (i = 0, max = get_loop_n_elements(loop); i < max; ++i) {
+		loop_element elem = get_loop_element(loop, i);
+		switch (*elem.kind) {
+			case k_ir_node:
+				pressure = be_compute_block_pressure(loop_ana, elem.node, cls);
+				break;
+			case k_ir_loop: {
+				unsigned son_pressure = be_compute_loop_pressure(loop_ana, elem.son, cls);
+				pressure = MAX(pressure, son_pressure);
+				break;
+			}
+			default:
+				assert(0);
+				break;
+		}
+   	}
+	DBG((loop_ana->dbg, LEVEL_1, "Done with loop %d, pressure %u for class %s\n", loop->loop_nr, pressure, cls->name));
+
+	/* update info in set */
+	key.loop = loop;
+	key.loop = 0;
+	key.cls  = cls;
+	entry    = set_insert(loop_ana->data, &key, sizeof(key), HASH_PTR(loop));
+	entry->max_pressure = MAX(entry->max_pressure, pressure);
+
+	return pressure;
+}
+
+/**
+ * Compute the register pressure for a class of all loops in the birg.
+ * @param birg  The backend irg object
+ * @param cls   The register class to compute the pressure for
+ * @return The loop analysation object.
+ */
+be_loopana_t *be_new_loop_pressure_cls(be_irg_t *birg, const arch_register_class_t *cls) {
+	be_loopana_t *loop_ana = xmalloc(sizeof(loop_ana));
+
+	loop_ana->data = new_set(cmp_loop_info, 16);
+	loop_ana->birg = birg;
+	FIRM_DBG_REGISTER(loop_ana->dbg, "firm.be.loopana");
+
+	be_compute_loop_pressure(loop_ana, get_irg_loop(birg->irg), cls);
+
+	return loop_ana;
+}
+
+/**
+ * Compute the register pressure for all classes of all loops in the birg.
+ * @param birg  The backend irg object
+ * @return The loop analysation object.
+ */
+be_loopana_t *be_new_loop_pressure(be_irg_t *birg) {
+	be_loopana_t *loop_ana = xmalloc(sizeof(loop_ana));
+	ir_loop      *irg_loop = get_irg_loop(birg->irg);
+	int          i;
+
+	loop_ana->data = new_set(cmp_loop_info, 16);
+	loop_ana->birg = birg;
+	FIRM_DBG_REGISTER(loop_ana->dbg, "firm.be.loopana");
+
+	for (i = arch_isa_get_n_reg_class(birg->main_env->arch_env->isa) - 1; i >= 0; --i) {
+		const arch_register_class_t *cls = arch_isa_get_reg_class(birg->main_env->arch_env->isa, i);
+		be_compute_loop_pressure(loop_ana, irg_loop, cls);
+	}
+
+	return loop_ana;
+}
+
+/**
+ * Returns the computed register pressure for the given class and loop.
+ * @return The pressure or INT_MAX if not found
+ */
+unsigned be_get_loop_pressure(be_loopana_t *loop_ana, const arch_register_class_t *cls, ir_loop *loop) {
+	unsigned pressure = INT_MAX;
+	be_loop_info_t *entry, key;
+
+	assert(cls && loop);
+
+	key.loop = loop;
+	key.cls  = cls;
+	entry    = set_find(loop_ana->data, &key, sizeof(key), HASH_PTR(&key));
+
+	if (entry)
+		pressure = entry->max_pressure;
+	else
+		assert(0 && "Pressure not computed for given class and loop object.");
+
+	return pressure;
+}
+
+/**
+ * Frees loop analysation object.
+ */
+void be_free_loop_pressure(be_loopana_t *loop_ana) {
+	del_set(loop_ana->data);
+	xfree(loop_ana);
+}

ir/be/beloopana.h

+/**
+ * Analyse register pressure in loops.
+ * @author Christian Wuerdig
+ * @date 2006/02/20
+ * @cvsid $Id$
+ */
+
+#ifndef _BELOOPANA_H_
+#define _BELOOPANA_H_
+
+#include "irloop.h"
+
+#include "bearch.h"
+#include "beirg.h"
+
+typedef struct _be_loopana_t be_loopana_t;
+
+/**
+ * Compute the register pressure for a class of all loops in the birg.
+ * @param birg  The backend irg object
+ * @param cls   The register class to compute the pressure for
+ * @return The loop analysation object.
+ */
+be_loopana_t *be_new_loop_pressure_cls(be_irg_t *birg, const arch_register_class_t *cls);
+
+/**
+ * Compute the register pressure for all classes of all loops in the birg.
+ * @param birg  The backend irg object
+ * @return The loop analysation object.
+ */
+be_loopana_t *be_new_loop_pressure(be_irg_t *birg);
+
+/**
+ * Returns the computed register pressure for the given class and loop.
+ * @return The pressure or INT_MAX if not found
+ */
+unsigned be_get_loop_pressure(be_loopana_t *loop_ana, const arch_register_class_t *cls, ir_loop *loop);
+
+/**
+ * Frees loop analysation object.
+ */
+void be_free_loop_pressure(be_loopana_t *loop_ana);
+
+#endif /* _BELOOPANA_H_ */