Commit 73ed3cd4 authored by Michael Beck's avatar Michael Beck
Browse files

Add a rule to transform x .op. (x .op. y) into y .op. (x .op. x) for...

Add a rule to transform x .op. (x .op. y) into y .op. (x .op. x) for commutative nodes. This finally "fixes" codegen/lea.c and might be usefull for and,or,xor as well.

[r26980]
parent 802484dd
......@@ -222,7 +222,7 @@ static ir_mode *get_mode_from_ops(ir_node *op1, ir_node *op2)
static int reassoc_commutative(ir_node **node)
{
ir_node *n = *node;
ir_op *op = get_irn_op(n);
ir_op *op = get_irn_op(n);
ir_node *block = get_nodes_block(n);
ir_node *t1, *c1;
......@@ -306,6 +306,55 @@ static int reassoc_commutative(ir_node **node)
}
}
}
if (get_irn_op(c1) == op) {
ir_node *t = c1;
c1 = t1;
t1 = t;
}
if (get_irn_op(t1) == op) {
ir_node *l = get_binop_left(t1);
ir_node *r = get_binop_right(t1);
const_class_t c_r;
if (r == c1) {
ir_node *t = r;
r = l;
l = t;
}
c_r = get_const_class(r, block);
if (c_r != NO_CONSTANT) {
/*
* Beware: don't do the following op if a constant was
* placed below, else we will fall into a loop.
*/
return 0;
}
if (l == c1) {
/* convert x .OP. (x .OP. y) => y .OP. (x .OP. x) */
ir_mode *mode_res = get_irn_mode(n);
ir_mode *mode_c1 = get_irn_mode(c1);
ir_node *irn, *in[2];
in[0] = c1;
in[1] = c1;
in[1] = optimize_node(new_ir_node(NULL, current_ir_graph, block, op, mode_c1, 2, in));
in[0] = r;
irn = optimize_node(new_ir_node(NULL, current_ir_graph, block, op, mode_res, 2, in));
DBG((dbg, LEVEL_5, "Applied: %n .%s. (%n .%s. %n) => %n .%s. (%n .%s. %n)\n",
c1, get_irn_opname(n), l, get_irn_opname(n), r,
r, get_irn_opname(n), c1, get_irn_opname(n), c1));
if (n != irn) {
exchange(n, irn);
*node = irn;
return 1;
}
}
}
return 0;
} /* reassoc_commutative */
......
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