/*
- * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
+ * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
*
* This file is part of libFirm.
*
#include "iredges_t.h"
#include "irgwalk.h"
#include "irprintf.h"
+#include "irtools.h"
/**
* Walker environment.
static void handle_if(ir_node *block, ir_node *cmp, pn_Cmp pnc, env_t *env) {
ir_node *left = get_Cmp_left(cmp);
ir_node *right = get_Cmp_right(cmp);
+ ir_node *cond_block;
ir_op *op;
const ir_edge_t *edge, *next;
* replace the left one by the right (potentially const) one.
*/
if (pnc == pn_Cmp_Eq) {
+ cond_block = get_Block_cfgpred_block(block, 0);
for (edge = get_irn_out_edge_first(left); edge; edge = next) {
- ir_node *succ = get_edge_src_irn(edge);
+ ir_node *user = get_edge_src_irn(edge);
int pos = get_edge_src_pos(edge);
- ir_node *blk = get_effective_use_block(succ, pos);
+ ir_node *blk = get_effective_use_block(user, pos);
next = get_irn_out_edge_next(left, edge);
if (block_dominates(block, blk)) {
* dominated by the branch block.
* We can replace the input with right.
*/
- set_irn_n(succ, pos, right);
+ set_irn_n(user, pos, right);
DBG_OPT_CONFIRM(left, right);
-// ir_printf("2 Replacing input %d of node %n with %n\n", pos, succ, right);
+// ir_printf("2 Replacing input %d of node %n with %n\n", pos, user, right);
env->num_eq += 1;
+ } else if (block_dominates(blk, cond_block)) {
+ if (is_Const(right) && get_irn_pinned(user) == op_pin_state_floats) {
+ /*
+ * left == Const and we found a movable user of left in a
+ * dominator of the Cond block
+ */
+ const ir_edge_t *edge, *next;
+ for (edge = get_irn_out_edge_first(user); edge; edge = next) {
+ ir_node *usr_of_usr = get_edge_src_irn(edge);
+ int npos = get_edge_src_pos(edge);
+ ir_node *blk = get_effective_use_block(usr_of_usr, npos);
+
+ next = get_irn_out_edge_next(user, edge);
+ if (block_dominates(block, blk)) {
+ /*
+ * The user of the user is dominated by our true/false
+ * block. So, create a copy of user WITH the constant
+ * replacing it's pos'th input.
+ *
+ * This is always good for unop's and might be good
+ * for binops.
+ *
+ * If user has other user in the false/true block, code
+ * placement will move it down.
+ * If there are users in cond block or upper, we create
+ * "redundant ops", because one will have a const op,
+ * the other no const ...
+ */
+ ir_node *new_op = exact_copy(user);
+ set_nodes_block(new_op, block);
+ set_irn_n(new_op, pos, right);
+ set_irn_n(usr_of_usr, npos, new_op);
+ }
+ }
+ }
}
}
} else { /* not pn_Cmp_Eq cases */
pos = get_edge_src_pos(edge);
set_irn_n(succ, pos, c);
-// ir_printf("3 Replacing input %d of node %n with %n\n", pos, succ, c);
+// ir_printf("3 Replacing input %d of node %n with %n\n", pos, user, c);
env->num_confirms += 1;
}