- case iro_Jmp: /* GL: Why not same for op_Raise?? */
- /* unreachable code elimination */
- if (is_Bad(get_nodes_Block(n))) n = new_Bad();
- break;
- /* We do not evaluate Cond here as we replace it by a new node, a Jmp.
- See cases for iro_Cond and iro_Proj in transform_node. */
- /** remove stuff as x+0, x*1 x&true ... constant expression evaluation **/
- case iro_Or: if (a == b) {n = a; break;}
- case iro_Add:
- case iro_Eor: {
- tarval *tv;
- ir_node *on;
- /* After running compute_node there is only one constant predecessor.
- Find this predecessors value and remember the other node: */
- if ((tv = computed_value (a)) != tarval_bad) {
- on = b;
- } else if ((tv = computed_value (b)) != tarval_bad) {
- on = a;
- } else break;
-
- /* If this predecessors constant value is zero, the operation is
- unnecessary. Remove it: */
- if (tarval_classify (tv) == 0) {
- n = on; DBG_OPT_ALGSIM1;
- }
- } break;
- case iro_Sub:
- case iro_Shl:
- case iro_Shr:
- case iro_Shrs:
- case iro_Rot:
- /* these operations are not commutative. Test only one predecessor. */
- if (tarval_classify (computed_value (b)) == 0) {
- n = a; DBG_OPT_ALGSIM1;
- /* Test if b > #bits of a ==> return 0 / divide b by #bits
- --> transform node? */
- }
- break;
- case iro_Not: /* NotNot x == x */
- case iro_Minus: /* --x == x */ /* ??? Is this possible or can --x raise an
- out of bounds exception if min =! max? */
- if (get_irn_op(get_unop_op(n)) == get_irn_op(n)) {
- n = get_unop_op(get_unop_op(n)); DBG_OPT_ALGSIM2;
- }
- break;
- case iro_Mul:
- /* Mul is commutative and has again an other neutral element. */
- if (tarval_classify (computed_value (a)) == 1) {
- n = b; DBG_OPT_ALGSIM1;
- } else if (tarval_classify (computed_value (b)) == 1) {
- n = a; DBG_OPT_ALGSIM1;
- }
- break;
- case iro_Div:
- /* Div is not commutative. */
- if (tarval_classify (computed_value (b)) == 1) { /* div(x, 1) == x */
- /* Turn Div into a tuple (mem, bad, a) */
- ir_node *mem = get_Div_mem(n);
- turn_into_tuple(n, 3);
- set_Tuple_pred(n, 0, mem);
- set_Tuple_pred(n, 1, new_Bad());
- set_Tuple_pred(n, 2, a);
- }
- break;
- /*
- case iro_Mod, Quot, DivMod
- DivMod allocates new nodes --> it's treated in transform node.
- What about Quot, DivMod?
- */
- case iro_And:
- if (a == b) {
- n = a; /* And has it's own neutral element */
- } else if (tarval_classify (computed_value (a)) == -1) {
- n = b;
- } else if (tarval_classify (computed_value (b)) == -1) {
- n = a;
- }
- if (n != oldn) DBG_OPT_ALGSIM1;
- break;
- case iro_Conv:
- if (get_irn_mode(n) == get_irn_mode(a)) { /* No Conv necessary */
- n = a; DBG_OPT_ALGSIM3;
- } else if (get_irn_mode(n) == mode_b) {
- if (get_irn_op(a) == op_Conv &&
- get_irn_mode (get_Conv_op(a)) == mode_b) {
- n = get_Conv_op(a); /* Convb(Conv*(xxxb(...))) == xxxb(...) */ DBG_OPT_ALGSIM2;
+/**
+ * optimize operations that are commutative and have neutral 0.
+ */
+static ir_node *equivalent_node_neutral_zero(ir_node *n)
+{
+ ir_node *oldn = n;
+
+ ir_node *a = get_binop_left(n);
+ ir_node *b = get_binop_right(n);
+
+ tarval *tv;
+ ir_node *on;
+
+ /* After running compute_node there is only one constant predecessor.
+ Find this predecessors value and remember the other node: */
+ if ((tv = computed_value (a)) != tarval_bad) {
+ on = b;
+ } else if ((tv = computed_value (b)) != tarval_bad) {
+ on = a;
+ } else
+ return n;
+
+ /* If this predecessors constant value is zero, the operation is
+ unnecessary. Remove it: */
+ if (tarval_classify (tv) == TV_CLASSIFY_NULL) {
+ n = on; DBG_OPT_ALGSIM1;
+ }
+
+ return n;
+}
+
+static ir_node *equivalent_node_Add(ir_node *n)
+{
+ return equivalent_node_neutral_zero(n);
+}
+
+static ir_node *equivalent_node_Eor(ir_node *n)
+{
+ return equivalent_node_neutral_zero(n);
+}
+
+/**
+ * optimize operations that are not commutative but have neutral 0 on left.
+ * Test only one predecessor.
+ */
+static ir_node *equivalent_node_left_zero(ir_node *n)
+{
+ ir_node *oldn = n;
+
+ ir_node *a = get_binop_left(n);
+ ir_node *b = get_binop_right(n);
+
+ if (tarval_classify (computed_value (b)) == TV_CLASSIFY_NULL) {
+ n = a; DBG_OPT_ALGSIM1;
+ }
+
+ return n;
+}
+
+static ir_node *equivalent_node_Sub(ir_node *n)
+{
+ return equivalent_node_left_zero(n);
+}
+
+static ir_node *equivalent_node_Shl(ir_node *n)
+{
+ return equivalent_node_left_zero(n);
+}
+
+static ir_node *equivalent_node_Shr(ir_node *n)
+{
+ return equivalent_node_left_zero(n);
+}
+
+static ir_node *equivalent_node_Shrs(ir_node *n)
+{
+ return equivalent_node_left_zero(n);
+}
+
+static ir_node *equivalent_node_Rot(ir_node *n)
+{
+ return equivalent_node_left_zero(n);
+}
+
+static ir_node *equivalent_node_symmetric_unop(ir_node *n)
+{
+ ir_node *oldn = n;
+
+ /* optimize symmetric unop */
+ if (get_irn_op(get_unop_op(n)) == get_irn_op(n)) {
+ n = get_unop_op(get_unop_op(n)); DBG_OPT_ALGSIM2;
+ }
+ return n;
+}
+
+static ir_node *equivalent_node_Not(ir_node *n)
+{
+ /* NotNot x == x */
+ return equivalent_node_symmetric_unop(n);
+}
+
+static ir_node *equivalent_node_Minus(ir_node *n)
+{
+ /* --x == x */ /* ??? Is this possible or can --x raise an
+ out of bounds exception if min =! max? */
+ return equivalent_node_symmetric_unop(n);
+}
+
+static ir_node *equivalent_node_Mul(ir_node *n)
+{
+ ir_node *oldn = n;
+
+ ir_node *a = get_Mul_left(n);
+ ir_node *b = get_Mul_right(n);
+
+ /* Mul is commutative and has again an other neutral element. */
+ if (tarval_classify (computed_value (a)) == TV_CLASSIFY_ONE) {
+ n = b; DBG_OPT_ALGSIM1;
+ } else if (tarval_classify (computed_value (b)) == TV_CLASSIFY_ONE) {
+ n = a; DBG_OPT_ALGSIM1;
+ }
+ return n;
+}
+
+static ir_node *equivalent_node_Div(ir_node *n)
+{
+ ir_node *a = get_Div_left(n);
+ ir_node *b = get_Div_right(n);
+
+ /* Div is not commutative. */
+ if (tarval_classify (computed_value (b)) == TV_CLASSIFY_ONE) { /* div(x, 1) == x */
+ /* Turn Div into a tuple (mem, bad, a) */
+ ir_node *mem = get_Div_mem(n);
+ turn_into_tuple(n, 3);
+ set_Tuple_pred(n, pn_Div_M, mem);
+ set_Tuple_pred(n, pn_Div_X_except, new_Bad()); /* no exception */
+ set_Tuple_pred(n, pn_Div_res, a);
+ }
+ return n;
+}
+
+static ir_node *equivalent_node_And(ir_node *n)
+{
+ ir_node *oldn = n;
+
+ ir_node *a = get_And_left(n);
+ ir_node *b = get_And_right(n);
+
+ if (a == b) {
+ n = a; /* And has it's own neutral element */
+ } else if (tarval_classify (computed_value (a)) == TV_CLASSIFY_ALL_ONE) {
+ n = b;
+ } else if (tarval_classify (computed_value (b)) == TV_CLASSIFY_ALL_ONE) {
+ n = a;
+ }
+ if (n != oldn) DBG_OPT_ALGSIM1;
+ return n;
+}
+
+static ir_node *equivalent_node_Conv(ir_node *n)
+{
+ ir_node *oldn = n;
+ ir_node *a = get_Conv_op(n);
+ ir_node *b;
+
+ ir_mode *n_mode = get_irn_mode(n);
+ ir_mode *a_mode = get_irn_mode(a);
+
+ if (n_mode == a_mode) { /* No Conv necessary */
+ n = a; DBG_OPT_ALGSIM3;
+ } else if (get_irn_op(a) == op_Conv) { /* Conv(Conv(b)) */
+ ir_mode *b_mode;
+
+ b = get_Conv_op(a);
+ n_mode = get_irn_mode(n);
+ b_mode = get_irn_mode(b);
+
+ if (n_mode == b_mode) {
+ if (n_mode == mode_b) {
+ n = b; /* Convb(Conv*(xxxb(...))) == xxxb(...) */ DBG_OPT_ALGSIM1;
+ }
+ else if (mode_is_int(n_mode) || mode_is_character(n_mode)) {
+ if (smaller_mode(b_mode, a_mode)){
+ n = b; /* ConvS(ConvL(xxxS(...))) == xxxS(...) */ DBG_OPT_ALGSIM1;
+ }