-/**
- * @file beintlive_t.h
- * @date 10.05.2007
- * @author Sebastian Hack
- *
- * Principal routines for liveness and interference checks.
- *
- * Copyright (C) 2007 Universitaet Karlsruhe
- * Released under the GPL
+/*
+ * This file is part of libFirm.
+ * Copyright (C) 2012 Universitaet Karlsruhe
*/
-
#ifndef _BELIVECHK_T_H
#define _BELIVECHK_T_H
#include "beutil.h"
#include "iredges_t.h"
-#define value_dominates(a, b) _value_dominates(a, b)
-
/**
* Check dominance of two nodes in the same block.
* @param a The first node.
* @param b The second node.
* @return 1 if a dominates b or if a == b, 0 else.
*/
-static inline int _value_dominates(const ir_node *a, const ir_node *b)
+static inline int value_dominates(const ir_node *a, const ir_node *b)
{
const ir_node *block_a = get_block_const(a);
const ir_node *block_b = get_block_const(b);
return _value_dominates_intrablock(a, b);
}
-/**
- * Check, if one value dominates the other.
- * The dominance is strict here.
- * @param a The first node.
- * @param b The second node.
- * @return 1 if a dominates b, 0 else.
- */
-static inline int _value_strictly_dominates(const ir_node *a, const ir_node *b)
-{
- const ir_node *block_a = get_block_const(a);
- const ir_node *block_b = get_block_const(b);
-
- /*
- * a and b are not in the same block,
- * so dominance is determined by the dominance of the blocks.
- */
- if(block_a != block_b) {
- return block_dominates(block_a, block_b);
- }
-
- /*
- * Dominance is determined by the time steps of the schedule.
- */
- return _value_strictly_dominates_intrablock(a, b);
-}
-
/**
* Check, if two values interfere.
* @param lv Liveness information
* @param a The first value.
* @param b The second value.
- * @return 1, if a and b interfere, 0 if not.
+ * @return true, if a and b interfere, false if not.
*/
-static inline int be_values_interfere(const be_lv_t *lv, const ir_node *a, const ir_node *b)
+static inline bool be_values_interfere(be_lv_t const *lv, ir_node const *a, ir_node const *b)
{
- int a2b = _value_dominates(a, b);
- int b2a = _value_dominates(b, a);
- int res = 0;
-
- /*
- * Adjust a and b so, that a dominates b if
- * a dominates b or vice versa.
- */
- if(b2a) {
- const ir_node *t = a;
+ if (value_dominates(b, a)) {
+ /* Adjust a and b so, that a dominates b if
+ * a dominates b or vice versa. */
+ ir_node const *const t = a;
a = b;
b = t;
- a2b = 1;
+ } else if (!value_dominates(a, b)) {
+ /* If there is no dominance relation, they do not interfere. */
+ return false;
}
- /* If there is no dominance relation, they do not interfere. */
- if(a2b) {
- ir_node *bb = get_nodes_block(b);
-
- /*
- * If a is live end in b's block it is
- * live at b's definition (a dominates b)
- */
- if(be_is_live_end(lv, bb, a)) {
- res = 1;
- goto end;
- }
-
- /*
- * Look at all usages of a.
- * If there's one usage of a in the block of b, then
- * we check, if this use is dominated by b, if that's true
- * a and b interfere. Note that b must strictly dominate the user,
- * since if b is the last user of in the block, b and a do not
- * interfere.
- * Uses of a not in b's block can be disobeyed, because the
- * check for a being live at the end of b's block is already
- * performed.
- */
- foreach_out_edge(a, edge) {
- const ir_node *user = get_edge_src_irn(edge);
- if(get_nodes_block(user) == bb && !is_Phi(user) && _value_strictly_dominates(b, user)) {
- res = 1;
- goto end;
- }
- }
+ ir_node *const bb = get_nodes_block(b);
+
+ /* If a is live end in b's block it is
+ * live at b's definition (a dominates b) */
+ if (be_is_live_end(lv, bb, a))
+ return true;
+
+ /* Look at all usages of a.
+ * If there's one usage of a in the block of b, then
+ * we check, if this use is dominated by b, if that's true
+ * a and b interfere. Note that b must strictly dominate the user,
+ * since if b is the last user of in the block, b and a do not
+ * interfere.
+ * Uses of a not in b's block can be disobeyed, because the
+ * check for a being live at the end of b's block is already
+ * performed. */
+ foreach_out_edge(a, edge) {
+ ir_node const *const user = get_edge_src_irn(edge);
+ if (get_nodes_block(user) == bb && !is_Phi(user) && _value_strictly_dominates_intrablock(b, user))
+ return true;
}
-end:
- return res;
+ return false;
}
#endif
projects / libfirm / blobdiff