+ CASE(Mux);
+ CASE(Psi);
+ CASE(Cmp);
+ CASE(Confirm);
+ CASE(CopyB);
+ CASE(Bound);
+ default:
+ /* leave NULL */;
+ }
+
+ return ops;
+#undef CASE
+}
+
+/**
+ * Do node specific optimizations of nodes predecessors.
+ */
+static void
+optimize_preds(ir_node *n) {
+ ir_node *a = NULL, *b = NULL;
+
+ /* get the operands we will work on for simple cases. */
+ if (is_binop(n)) {
+ a = get_binop_left(n);
+ b = get_binop_right(n);
+ } else if (is_unop(n)) {
+ a = get_unop_op(n);
+ }
+
+ switch (get_irn_opcode(n)) {
+
+ case iro_Cmp:
+ /* We don't want Cast as input to Cmp. */
+ if (get_irn_op(a) == op_Cast) {
+ a = get_Cast_op(a);
+ set_Cmp_left(n, a);
+ }
+ if (get_irn_op(b) == op_Cast) {
+ b = get_Cast_op(b);
+ set_Cmp_right(n, b);
+ }
+ break;
+
+ default: break;
+ } /* end switch */
+}
+
+/**
+ * Transform AddP(P, ConvIs(Iu)), AddP(P, ConvIu(Is)) and
+ * SubP(P, ConvIs(Iu)), SubP(P, ConvIu(Is)).
+ * If possible, remove the Conv's.
+ */
+static ir_node *transform_node_AddSub(ir_node *n)
+{
+ ir_mode *mode = get_irn_mode(n);
+
+ if (mode_is_reference(mode)) {
+ ir_node *left = get_binop_left(n);
+ ir_node *right = get_binop_right(n);
+ int ref_bits = get_mode_size_bits(mode);
+
+ if (get_irn_op(left) == op_Conv) {
+ ir_mode *mode = get_irn_mode(left);
+ int bits = get_mode_size_bits(mode);
+
+ if (ref_bits == bits &&
+ mode_is_int(mode) &&
+ get_mode_arithmetic(mode) == irma_twos_complement) {
+ ir_node *pre = get_Conv_op(left);
+ ir_mode *pre_mode = get_irn_mode(pre);
+
+ if (mode_is_int(pre_mode) &&
+ get_mode_size_bits(pre_mode) == bits &&
+ get_mode_arithmetic(pre_mode) == irma_twos_complement) {
+ /* ok, this conv just changes to sign, moreover the calculation
+ * is done with same number of bits as our address mode, so
+ * we can ignore the conv as address calculation can be viewed
+ * as either signed or unsigned
+ */
+ set_binop_left(n, pre);
+ }
+ }
+ }
+
+ if (get_irn_op(right) == op_Conv) {
+ ir_mode *mode = get_irn_mode(right);
+ int bits = get_mode_size_bits(mode);
+
+ if (ref_bits == bits &&
+ mode_is_int(mode) &&
+ get_mode_arithmetic(mode) == irma_twos_complement) {
+ ir_node *pre = get_Conv_op(right);
+ ir_mode *pre_mode = get_irn_mode(pre);
+
+ if (mode_is_int(pre_mode) &&
+ get_mode_size_bits(pre_mode) == bits &&
+ get_mode_arithmetic(pre_mode) == irma_twos_complement) {
+ /* ok, this conv just changes to sign, moreover the calculation
+ * is done with same number of bits as our address mode, so
+ * we can ignore the conv as address calculation can be viewed
+ * as either signed or unsigned
+ */
+ set_binop_right(n, pre);
+ }
+ }
+ }
+ }
+ return n;
+}
+
+/**
+ * Do the AddSub optimization, then Transform
+ * Add(a,a) -> Mul(a, 2)
+ * Add(Mul(a, x), a) -> Mul(a, x+1)
+ * if the mode is integer or float.
+ * Transform Add(a,-b) into Sub(a,b).
+ * Reassociation might fold this further.
+ */
+static ir_node *transform_node_Add(ir_node *n)
+{
+ ir_mode *mode;
+ ir_node *oldn = n;
+
+ n = transform_node_AddSub(n);
+
+ mode = get_irn_mode(n);
+ if (mode_is_num(mode)) {
+ ir_node *a = get_Add_left(n);
+ ir_node *b = get_Add_right(n);
+
+ if (a == b) {
+ ir_node *block = get_irn_n(n, -1);
+
+ n = new_rd_Mul(
+ get_irn_dbg_info(n),
+ current_ir_graph,
+ block,
+ a,
+ new_r_Const_long(current_ir_graph, block, mode, 2),
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_A_A);
+ }
+ else if (get_irn_op(a) == op_Minus) {
+ n = new_rd_Sub(
+ get_irn_dbg_info(n),
+ current_ir_graph,
+ get_irn_n(n, -1),
+ b,
+ get_Minus_op(a),
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_A_MINUS_B);
+ }
+ else if (get_irn_op(b) == op_Minus) {
+ n = new_rd_Sub(
+ get_irn_dbg_info(n),
+ current_ir_graph,
+ get_irn_n(n, -1),
+ a,
+ get_Minus_op(b),
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_A_MINUS_B);
+ }
+ /* do NOT execute this code if reassociation is enabled, it does the inverse! */
+ else if (!get_opt_reassociation() && get_irn_op(a) == op_Mul) {
+ ir_node *ma = get_Mul_left(a);
+ ir_node *mb = get_Mul_right(a);
+
+ if (b == ma) {
+ ir_node *blk = get_irn_n(n, -1);
+ n = new_rd_Mul(
+ get_irn_dbg_info(n), current_ir_graph, blk,
+ ma,
+ new_rd_Add(
+ get_irn_dbg_info(n), current_ir_graph, blk,
+ mb,
+ new_r_Const_long(current_ir_graph, blk, mode, 1),
+ mode),
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_MUL_A_X_A);
+ }
+ else if (b == mb) {
+ ir_node *blk = get_irn_n(n, -1);
+ n = new_rd_Mul(
+ get_irn_dbg_info(n), current_ir_graph, blk,
+ mb,
+ new_rd_Add(
+ get_irn_dbg_info(n), current_ir_graph, blk,
+ ma,
+ new_r_Const_long(current_ir_graph, blk, mode, 1),
+ mode),
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_MUL_A_X_A);
+ }
+ }
+ /* do NOT execute this code if reassociation is enabled, it does the inverse! */
+ else if (!get_opt_reassociation() && get_irn_op(b) == op_Mul) {
+ ir_node *ma = get_Mul_left(b);
+ ir_node *mb = get_Mul_right(b);
+
+ if (a == ma) {
+ ir_node *blk = get_irn_n(n, -1);
+ n = new_rd_Mul(
+ get_irn_dbg_info(n), current_ir_graph, blk,
+ ma,
+ new_rd_Add(
+ get_irn_dbg_info(n), current_ir_graph, blk,
+ mb,
+ new_r_Const_long(current_ir_graph, blk, mode, 1),
+ mode),
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_MUL_A_X_A);
+ }
+ else if (a == mb) {
+ ir_node *blk = get_irn_n(n, -1);
+ n = new_rd_Mul(
+ get_irn_dbg_info(n), current_ir_graph, blk,
+ mb,
+ new_rd_Add(
+ get_irn_dbg_info(n), current_ir_graph, blk,
+ ma,
+ new_r_Const_long(current_ir_graph, blk, mode, 1),
+ mode),
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_MUL_A_X_A);
+ }
+ }
+ }
+ return n;
+}
+
+/**
+ * Do the AddSub optimization, then Transform
+ * Sub(0,a) -> Minus(a)
+ * Sub(Mul(a, x), a) -> Mul(a, x-1)
+ */
+static ir_node *transform_node_Sub(ir_node *n)
+{
+ ir_mode *mode;
+ ir_node *oldn = n;
+ ir_node *a, *b;
+
+ n = transform_node_AddSub(n);
+
+ mode = get_irn_mode(n);
+ a = get_Sub_left(n);
+ b = get_Sub_right(n);
+ if (mode_is_num(mode) && (classify_Const(a) == CNST_NULL)) {
+ n = new_rd_Minus(
+ get_irn_dbg_info(n),
+ current_ir_graph,
+ get_irn_n(n, -1),
+ b,
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_0_A);
+ }
+ /* do NOT execute this code if reassociation is enabled, it does the inverse! */
+ else if (get_opt_reassociation() && get_irn_op(a) == op_Mul) {
+ ir_node *ma = get_Mul_left(a);
+ ir_node *mb = get_Mul_right(a);
+
+ if (ma == b) {
+ ir_node *blk = get_irn_n(n, -1);
+ n = new_rd_Mul(
+ get_irn_dbg_info(n),
+ current_ir_graph, blk,
+ ma,
+ new_rd_Sub(
+ get_irn_dbg_info(n),
+ current_ir_graph, blk,
+ mb,
+ new_r_Const_long(current_ir_graph, blk, mode, 1),
+ mode),
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_MUL_A_X_A);
+ }
+ else if (mb == b) {
+ ir_node *blk = get_irn_n(n, -1);
+ n = new_rd_Mul(
+ get_irn_dbg_info(n),
+ current_ir_graph, blk,
+ mb,
+ new_rd_Sub(
+ get_irn_dbg_info(n),
+ current_ir_graph, blk,
+ ma,
+ new_r_Const_long(current_ir_graph, blk, mode, 1),
+ mode),
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_MUL_A_X_A);
+ }
+ }
+
+ return n;
+}
+
+/**
+ * Transform Mul(a,-1) into -a.
+ * Do architecture dependent optimizations on Mul nodes
+ */
+static ir_node *transform_node_Mul(ir_node *n) {
+ ir_node *oldn = n;
+ ir_mode *mode = get_irn_mode(n);
+
+ if (mode_is_signed(mode)) {
+ ir_node *r = NULL;
+ ir_node *a = get_Mul_left(n);
+ ir_node *b = get_Mul_right(n);
+
+ if (value_of(a) == get_mode_minus_one(mode))
+ r = b;
+ else if (value_of(b) == get_mode_minus_one(mode))
+ r = a;
+ if (r) {
+ n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, get_irn_n(n, -1), r, mode);
+ DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS_1);
+ return n;
+ }
+ }
+ return arch_dep_replace_mul_with_shifts(n);
+}
+
+/**
+ * transform a Div Node
+ */
+static ir_node *transform_node_Div(ir_node *n)
+{
+ tarval *tv = value_of(n);
+ ir_node *value = n;
+
+ /* BEWARE: it is NOT possible to optimize a/a to 1, as this may cause a exception */
+
+ if (tv != tarval_bad) {
+ value = new_Const(get_tarval_mode(tv), tv);
+
+ DBG_OPT_CSTEVAL(n, value);
+ }
+ else /* Try architecture dependent optimization */
+ value = arch_dep_replace_div_by_const(n);
+
+ if (value != n) {
+ /* Turn Div into a tuple (mem, bad, value) */
+ ir_node *mem = get_Div_mem(n);
+
+ turn_into_tuple(n, pn_Div_max);
+ set_Tuple_pred(n, pn_Div_M, mem);
+ set_Tuple_pred(n, pn_Div_X_except, new_Bad());
+ set_Tuple_pred(n, pn_Div_res, value);
+ }
+ return n;
+}
+
+/**
+ * transform a Mod node
+ */
+static ir_node *transform_node_Mod(ir_node *n)
+{
+ tarval *tv = value_of(n);
+ ir_node *value = n;
+
+ /* BEWARE: it is NOT possible to optimize a%a to 0, as this may cause a exception */
+
+ if (tv != tarval_bad) {
+ value = new_Const(get_tarval_mode(tv), tv);
+
+ DBG_OPT_CSTEVAL(n, value);
+ }
+ else /* Try architecture dependent optimization */
+ value = arch_dep_replace_mod_by_const(n);
+
+ if (value != n) {
+ /* Turn Mod into a tuple (mem, bad, value) */
+ ir_node *mem = get_Mod_mem(n);
+
+ turn_into_tuple(n, pn_Mod_max);
+ set_Tuple_pred(n, pn_Mod_M, mem);
+ set_Tuple_pred(n, pn_Mod_X_except, new_Bad());
+ set_Tuple_pred(n, pn_Mod_res, value);
+ }
+ return n;
+}
+
+/**
+ * transform a DivMod node
+ */
+static ir_node *transform_node_DivMod(ir_node *n)
+{
+ int evaluated = 0;
+
+ ir_node *a = get_DivMod_left(n);
+ ir_node *b = get_DivMod_right(n);
+ ir_mode *mode = get_irn_mode(a);
+ tarval *ta = value_of(a);
+ tarval *tb = value_of(b);
+
+ if (!(mode_is_int(mode) && mode_is_int(get_irn_mode(b))))
+ return n;
+
+ /* BEWARE: it is NOT possible to optimize a/a to 1, as this may cause a exception */
+
+ if (tb != tarval_bad) {
+ if (tb == get_mode_one(get_tarval_mode(tb))) {
+ b = new_Const (mode, get_mode_null(mode));
+ evaluated = 1;
+
+ DBG_OPT_CSTEVAL(n, b);
+ }
+ else if (ta != tarval_bad) {
+ tarval *resa, *resb;
+ resa = tarval_div (ta, tb);
+ if (resa == tarval_bad) return n; /* Causes exception!!! Model by replacing through
+ Jmp for X result!? */
+ resb = tarval_mod (ta, tb);
+ if (resb == tarval_bad) return n; /* Causes exception! */
+ a = new_Const (mode, resa);
+ b = new_Const (mode, resb);
+ evaluated = 1;
+
+ DBG_OPT_CSTEVAL(n, a);
+ DBG_OPT_CSTEVAL(n, b);
+ }
+ else { /* Try architecture dependent optimization */
+ arch_dep_replace_divmod_by_const(&a, &b, n);
+ evaluated = a != NULL;
+ }
+ } else if (ta == get_mode_null(mode)) {
+ /* 0 / non-Const = 0 */
+ b = a;
+ evaluated = 1;
+ }
+
+ if (evaluated) { /* replace by tuple */
+ ir_node *mem = get_DivMod_mem(n);
+ turn_into_tuple(n, pn_DivMod_max);
+ set_Tuple_pred(n, pn_DivMod_M, mem);
+ set_Tuple_pred(n, pn_DivMod_X_except, new_Bad()); /* no exception */
+ set_Tuple_pred(n, pn_DivMod_res_div, a);
+ set_Tuple_pred(n, pn_DivMod_res_mod, b);
+ }
+
+ return n;
+}
+
+/**
+ * Optimize Abs(x) into x if x is Confirmed >= 0
+ * Optimize Abs(x) into -x if x is Confirmed <= 0
+ */
+static ir_node *transform_node_Abs(ir_node *n)
+{
+ ir_node *oldn = n;
+ ir_node *a = get_Abs_op(n);
+ value_classify sign = classify_value_sign(a);
+
+ if (sign == VALUE_NEGATIVE) {
+ ir_mode *mode = get_irn_mode(n);
+
+ /*
+ * We can replace the Abs by -x here.
+ * We even could add a new Confirm here.
+ *
+ * Note that -x would create a new node, so we could
+ * not run it in the equivalent_node() context.
+ */
+ n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph,
+ get_irn_n(n, -1), a, mode);
+
+ DBG_OPT_CONFIRM(oldn, n);
+ }
+ else if (sign == VALUE_POSITIVE) {
+ /* n is positive, Abs is not needed */
+ n = a;
+
+ DBG_OPT_CONFIRM(oldn, n);
+ }
+
+ return n;
+}
+
+/**
+ * transform a Cond node
+ */
+static ir_node *transform_node_Cond(ir_node *n)
+{
+ /* Replace the Cond by a Jmp if it branches on a constant
+ condition. */
+ ir_node *jmp;
+ ir_node *a = get_Cond_selector(n);
+ tarval *ta = value_of(a);
+
+ /* we need block info which is not available in floating irgs */
+ if (get_irg_pinned(current_ir_graph) == op_pin_state_floats)
+ return n;
+
+ if ((ta != tarval_bad) &&
+ (get_irn_mode(a) == mode_b) &&
+ (get_opt_unreachable_code())) {
+ /* It's a boolean Cond, branching on a boolean constant.
+ Replace it by a tuple (Bad, Jmp) or (Jmp, Bad) */
+ jmp = new_r_Jmp(current_ir_graph, get_nodes_block(n));
+ turn_into_tuple(n, pn_Cond_max);
+ if (ta == tarval_b_true) {
+ set_Tuple_pred(n, pn_Cond_false, new_Bad());
+ set_Tuple_pred(n, pn_Cond_true, jmp);
+ } else {
+ set_Tuple_pred(n, pn_Cond_false, jmp);
+ set_Tuple_pred(n, pn_Cond_true, new_Bad());
+ }
+ /* We might generate an endless loop, so keep it alive. */
+ add_End_keepalive(get_irg_end(current_ir_graph), get_nodes_block(n));
+ }
+ return n;
+}
+
+/**
+ * Transform an Eor.
+ */
+static ir_node *transform_node_Eor(ir_node *n)
+{
+ ir_node *oldn = n;
+ ir_node *a = get_Eor_left(n);
+ ir_node *b = get_Eor_right(n);
+ ir_mode *mode = get_irn_mode(n);
+
+ if (a == b) {
+ /* a ^ a = 0 */
+ n = new_rd_Const(get_irn_dbg_info(n), current_ir_graph, get_irn_n(n, -1),
+ mode, get_mode_null(mode));
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_A_A);
+ }
+ else if ((mode == mode_b)
+ && (get_irn_op(a) == op_Proj)
+ && (get_irn_mode(a) == mode_b)
+ && (classify_tarval (value_of(b)) == TV_CLASSIFY_ONE)
+ && (get_irn_op(get_Proj_pred(a)) == op_Cmp)) {
+ /* The Eor negates a Cmp. The Cmp has the negated result anyways! */
+ n = new_r_Proj(current_ir_graph, get_irn_n(n, -1), get_Proj_pred(a),
+ mode_b, get_negated_pnc(get_Proj_proj(a), mode));
+
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_TO_NOT_BOOL);
+ }
+ else if ((mode == mode_b)
+ && (classify_tarval (value_of(b)) == TV_CLASSIFY_ONE)) {
+ /* The Eor is a Not. Replace it by a Not. */
+ /* ????!!!Extend to bitfield 1111111. */
+ n = new_r_Not(current_ir_graph, get_irn_n(n, -1), a, mode_b);
+
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_TO_NOT);
+ }
+
+ return n;
+}
+
+/**
+ * Transform a boolean Not.
+ */
+static ir_node *transform_node_Not(ir_node *n)
+{
+ ir_node *oldn = n;
+ ir_node *a = get_Not_op(n);
+
+ if ( (get_irn_mode(n) == mode_b)
+ && (get_irn_op(a) == op_Proj)
+ && (get_irn_mode(a) == mode_b)
+ && (get_irn_op(get_Proj_pred(a)) == op_Cmp)) {
+ /* We negate a Cmp. The Cmp has the negated result anyways! */
+ n = new_r_Proj(current_ir_graph, get_irn_n(n, -1), get_Proj_pred(a),
+ mode_b, get_negated_pnc(get_Proj_proj(a), mode_b));
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_NOT_CMP);
+ }
+
+ return n;
+}
+
+/**
+ * Transform a Cast_type(Const) into a new Const_type
+ */
+static ir_node *transform_node_Cast(ir_node *n) {
+ ir_node *oldn = n;
+ ir_node *pred = get_Cast_op(n);
+ ir_type *tp = get_irn_type(n);
+
+ if (get_irn_op(pred) == op_Const && get_Const_type(pred) != tp) {
+ n = new_rd_Const_type(NULL, current_ir_graph, get_irn_n(pred, -1), get_irn_mode(pred),
+ get_Const_tarval(pred), tp);
+ DBG_OPT_CSTEVAL(oldn, n);
+ } else if ((get_irn_op(pred) == op_SymConst) && (get_SymConst_value_type(pred) != tp)) {
+ n = new_rd_SymConst_type(NULL, current_ir_graph, get_irn_n(pred, -1), get_SymConst_symbol(pred),
+ get_SymConst_kind(pred), tp);
+ DBG_OPT_CSTEVAL(oldn, n);
+ }
+
+ return n;
+}
+
+/**
+ * Transform a Proj(Div) with a non-zero value.
+ * Removes the exceptions and routes the memory to the NoMem node.
+ */
+static ir_node *transform_node_Proj_Div(ir_node *proj)
+{
+ ir_node *n = get_Proj_pred(proj);
+ ir_node *b = get_Div_right(n);
+ long proj_nr;
+
+ if (value_not_zero(b)) {
+ /* div(x, y) && y != 0 */
+ proj_nr = get_Proj_proj(proj);
+
+ /* this node may float if it did not depend on a Confirm */
+ set_irn_pinned(n, op_pin_state_floats);
+
+ if (proj_nr == pn_Div_X_except) {
+ /* we found an exception handler, remove it */
+ DBG_OPT_EXC_REM(proj);
+ return new_Bad();
+ }
+ else if (proj_nr == pn_Div_M) {
+ ir_node *res = get_Div_mem(n);
+ /* the memory Proj can only be removed if we divide by a
+ real constant, but the node never produce a new memory */
+ if (value_of(b) != tarval_bad) {
+ /* this is a Div by a const, we can remove the memory edge */
+ set_Div_mem(n, get_irg_no_mem(current_ir_graph));
+ }
+ return res;
+ }
+ }
+ return proj;
+}
+
+/**
+ * Transform a Proj(Mod) with a non-zero value.
+ * Removes the exceptions and routes the memory to the NoMem node.
+ */
+static ir_node *transform_node_Proj_Mod(ir_node *proj)
+{
+ ir_node *n = get_Proj_pred(proj);
+ ir_node *b = get_Mod_right(n);
+ long proj_nr;
+
+ if (value_not_zero(b)) {
+ /* mod(x, y) && y != 0 */
+ proj_nr = get_Proj_proj(proj);
+
+ /* this node may float if it did not depend on a Confirm */
+ set_irn_pinned(n, op_pin_state_floats);
+
+ if (proj_nr == pn_Mod_X_except) {
+ /* we found an exception handler, remove it */
+ DBG_OPT_EXC_REM(proj);
+ return new_Bad();
+ } else if (proj_nr == pn_Mod_M) {
+ ir_node *res = get_Mod_mem(n);
+ /* the memory Proj can only be removed if we divide by a
+ real constant, but the node never produce a new memory */
+ if (value_of(b) != tarval_bad) {
+ /* this is a Mod by a const, we can remove the memory edge */
+ set_Mod_mem(n, get_irg_no_mem(current_ir_graph));
+ }
+ return res;
+ }
+ else if (proj_nr == pn_Mod_res && get_Mod_left(n) == b) {
+ /* a % a = 0 if a != 0 */
+ ir_mode *mode = get_irn_mode(proj);
+ ir_node *res = new_Const(mode, get_mode_null(mode));
+
+ DBG_OPT_CSTEVAL(n, res);
+ return res;
+ }
+ }
+ return proj;
+}
+
+/**
+ * Transform a Proj(DivMod) with a non-zero value.
+ * Removes the exceptions and routes the memory to the NoMem node.
+ */
+static ir_node *transform_node_Proj_DivMod(ir_node *proj)
+{
+ ir_node *n = get_Proj_pred(proj);
+ ir_node *b = get_DivMod_right(n);
+ long proj_nr;
+
+ if (value_not_zero(b)) {
+ /* DivMod(x, y) && y != 0 */
+ proj_nr = get_Proj_proj(proj);
+
+ /* this node may float if it did not depend on a Confirm */
+ set_irn_pinned(n, op_pin_state_floats);
+
+ if (proj_nr == pn_DivMod_X_except) {
+ /* we found an exception handler, remove it */
+ DBG_OPT_EXC_REM(proj);
+ return new_Bad();
+ }
+ else if (proj_nr == pn_DivMod_M) {
+ ir_node *res = get_DivMod_mem(n);
+ /* the memory Proj can only be removed if we divide by a
+ real constant, but the node never produce a new memory */
+ if (value_of(b) != tarval_bad) {
+ /* this is a DivMod by a const, we can remove the memory edge */
+ set_DivMod_mem(n, get_irg_no_mem(current_ir_graph));
+ }
+ return res;
+ }
+ else if (proj_nr == pn_DivMod_res_mod && get_DivMod_left(n) == b) {
+ /* a % a = 0 if a != 0 */
+ ir_mode *mode = get_irn_mode(proj);
+ ir_node *res = new_Const(mode, get_mode_null(mode));
+
+ DBG_OPT_CSTEVAL(n, res);
+ return res;
+ }
+ }
+ return proj;
+}
+
+/**
+ * Optimizes jump tables (CondIs or CondIu) by removing all impossible cases.
+ */
+static ir_node *transform_node_Proj_Cond(ir_node *proj)
+{
+ if (get_opt_unreachable_code()) {
+ ir_node *n = get_Proj_pred(proj);
+ ir_node *b = get_Cond_selector(n);
+
+ if (mode_is_int(get_irn_mode(b))) {
+ tarval *tb = value_of(b);
+
+ if (tb != tarval_bad) {
+ /* we have a constant switch */
+ long num = get_Proj_proj(proj);
+
+ if (num != get_Cond_defaultProj(n)) { /* we cannot optimize default Proj's yet */
+ if (get_tarval_long(tb) == num) {
+ /* Do NOT create a jump here, or we will have 2 control flow ops
+ * in a block. This case is optimized away in optimize_cf(). */
+ return proj;
+ }
+ else {
+ /* this case will NEVER be taken, kill it */
+ return new_Bad();
+ }
+ }
+ }
+ }
+ }
+ return proj;
+}
+
+/**
+ * Normalizes and optimizes Cmp nodes.
+ */
+static ir_node *transform_node_Proj_Cmp(ir_node *proj)
+{
+ if (get_opt_reassociation()) {
+ ir_node *n = get_Proj_pred(proj);
+ ir_node *left = get_Cmp_left(n);
+ ir_node *right = get_Cmp_right(n);
+ ir_node *c = NULL;
+ tarval *tv = NULL;
+ int changed = 0;
+ ir_mode *mode = NULL;
+ long proj_nr = get_Proj_proj(proj);
+
+ /*
+ * First step: normalize the compare op
+ * by placing the constant on the right site
+ * or moving the lower address node to the left.
+ * We ignore the case that both are constants
+ * this case should be optimized away.
+ */
+ if (get_irn_op(right) == op_Const)
+ c = right;
+ else if (get_irn_op(left) == op_Const) {
+ c = left;
+ left = right;
+ right = c;
+
+ proj_nr = get_inversed_pnc(proj_nr);
+ changed |= 1;
+ }
+ else if (get_irn_idx(left) > get_irn_idx(right)) {
+ ir_node *t = left;
+
+ left = right;
+ right = t;
+
+ proj_nr = get_inversed_pnc(proj_nr);
+ changed |= 1;
+ }
+
+ /*
+ * Second step: Try to reduce the magnitude
+ * of a constant. This may help to generate better code
+ * later and may help to normalize more compares.
+ * Of course this is only possible for integer values.
+ */
+ if (c) {
+ mode = get_irn_mode(c);
+ tv = get_Const_tarval(c);
+
+ if (tv != tarval_bad) {
+ /* the following optimization is possible on modes without Overflow
+ * on Unary Minus or on == and !=:
+ * -a CMP c ==> a swap(CMP) -c
+ *
+ * Beware: for two-complement Overflow may occur, so only == and != can
+ * be optimized, see this:
+ * -MININT < 0 =/=> MININT > 0 !!!
+ */
+ if (get_opt_constant_folding() && get_irn_op(left) == op_Minus &&
+ (!mode_overflow_on_unary_Minus(mode) ||
+ (mode_is_int(mode) && (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg)))) {
+ left = get_Minus_op(left);
+ tv = tarval_sub(get_mode_null(mode), tv);
+
+ proj_nr = get_inversed_pnc(proj_nr);
+ changed |= 2;
+ }
+
+ /* for integer modes, we have more */
+ if (mode_is_int(mode)) {
+ /* Ne includes Unordered which is not possible on integers.
+ * However, frontends often use this wrong, so fix it here */
+ if (proj_nr & pn_Cmp_Uo) {
+ proj_nr &= ~pn_Cmp_Uo;
+ set_Proj_proj(proj, proj_nr);
+ }
+
+ /* c > 0 : a < c ==> a <= (c-1) a >= c ==> a > (c-1) */
+ if ((proj_nr == pn_Cmp_Lt || proj_nr == pn_Cmp_Ge) &&
+ tarval_cmp(tv, get_mode_null(mode)) == pn_Cmp_Gt) {
+ tv = tarval_sub(tv, get_mode_one(mode));
+
+ proj_nr ^= pn_Cmp_Eq;
+ changed |= 2;
+ }
+ /* c < 0 : a > c ==> a >= (c+1) a <= c ==> a < (c+1) */
+ else if ((proj_nr == pn_Cmp_Gt || proj_nr == pn_Cmp_Le) &&
+ tarval_cmp(tv, get_mode_null(mode)) == pn_Cmp_Lt) {
+ tv = tarval_add(tv, get_mode_one(mode));
+
+ proj_nr ^= pn_Cmp_Eq;
+ changed |= 2;
+ }
+
+ /* the following reassociations work only for == and != */
+ if (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) {
+
+ /* a-b == 0 ==> a == b, a-b != 0 ==> a != b */
+ if (classify_tarval(tv) == TV_CLASSIFY_NULL && get_irn_op(left) == op_Sub) {
+ right = get_Sub_right(left);
+ left = get_Sub_left(left);
+
+ tv = value_of(right);
+ changed = 1;
+ }
+
+ if (tv != tarval_bad) {
+ ir_op *op = get_irn_op(left);
+
+ /* a-c1 == c2 ==> a == c2+c1, a-c1 != c2 ==> a != c2+c1 */
+ if (op == op_Sub) {
+ ir_node *c1 = get_Sub_right(left);
+ tarval *tv2 = value_of(c1);
+
+ if (tv2 != tarval_bad) {
+ tv2 = tarval_add(tv, value_of(c1));
+
+ if (tv2 != tarval_bad) {
+ left = get_Sub_left(left);
+ tv = tv2;
+ changed |= 2;
+ }
+ }
+ }
+ /* a+c1 == c2 ==> a == c2-c1, a+c1 != c2 ==> a != c2-c1 */
+ else if (op == op_Add) {
+ ir_node *a_l = get_Add_left(left);
+ ir_node *a_r = get_Add_right(left);
+ ir_node *a;
+ tarval *tv2;
+
+ if (get_irn_op(a_l) == op_Const) {
+ a = a_r;
+ tv2 = value_of(a_l);
+ }
+ else {
+ a = a_l;
+ tv2 = value_of(a_r);
+ }
+
+ if (tv2 != tarval_bad) {
+ tv2 = tarval_sub(tv, tv2);
+
+ if (tv2 != tarval_bad) {
+ left = a;
+ tv = tv2;
+ changed |= 2;
+ }
+ }
+ }
+ /* -a == c ==> a == -c, -a != c ==> a != -c */
+ else if (op == op_Minus) {
+ tarval *tv2 = tarval_sub(get_mode_null(mode), tv);
+
+ if (tv2 != tarval_bad) {
+ left = get_Minus_op(left);
+ tv = tv2;
+ changed |= 2;
+ }
+ }
+ }
+ } /* == or != */
+ /* the following reassociations work only for <= */
+ else if (proj_nr == pn_Cmp_Le || proj_nr == pn_Cmp_Lt) {
+ if (tv != tarval_bad) {
+ ir_op *op = get_irn_op(left);
+
+ /* c >= 0 : Abs(a) <= c ==> (unsigned)(a + c) <= 2*c */
+ if (op == op_Abs) {
+ }
+ }
+ }
+ } /* mode_is_int */
+
+ /*
+ * optimization for AND:
+ * Optimize:
+ * And(x, C) == C ==> And(x, C) != 0
+ * And(x, C) != C ==> And(X, C) == 0
+ *
+ * if C is a single Bit constant.
+ */
+ if ((proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) &&
+ (get_irn_op(left) == op_And)) {
+ if (is_single_bit_tarval(tv)) {
+ /* check for Constant's match. We have check hare the tarvals,
+ because our const might be changed */
+ ir_node *la = get_And_left(left);
+ ir_node *ra = get_And_right(left);
+ if ((is_Const(la) && get_Const_tarval(la) == tv) ||
+ (is_Const(ra) && get_Const_tarval(ra) == tv)) {
+ /* fine: do the transformation */
+ tv = get_mode_null(get_tarval_mode(tv));
+ proj_nr ^= pn_Cmp_Leg;
+ changed |= 2;
+ }
+ }
+ }
+ } /* tarval != bad */
+ }
+
+ if (changed) {
+ ir_node *block = get_irn_n(n, -1); /* Beware of get_nodes_Block() */
+
+ if (changed & 2) /* need a new Const */
+ right = new_Const(mode, tv);
+
+ /* create a new compare */
+ n = new_rd_Cmp(get_irn_dbg_info(n), current_ir_graph, block,
+ left, right);
+
+ set_Proj_pred(proj, n);
+ set_Proj_proj(proj, proj_nr);
+ }
+ }
+ return proj;
+}
+
+/**
+ * Does all optimizations on nodes that must be done on it's Proj's
+ * because of creating new nodes.
+ */
+static ir_node *transform_node_Proj(ir_node *proj)
+{
+ ir_node *n = get_Proj_pred(proj);
+
+ switch (get_irn_opcode(n)) {
+ case iro_Div:
+ return transform_node_Proj_Div(proj);
+
+ case iro_Mod:
+ return transform_node_Proj_Mod(proj);
+
+ case iro_DivMod:
+ return transform_node_Proj_DivMod(proj);
+
+ case iro_Cond:
+ return transform_node_Proj_Cond(proj);
+
+ case iro_Cmp:
+ return transform_node_Proj_Cmp(proj);
+
+ case iro_Tuple:
+ /* should not happen, but if it does will be optimized away */
+ return equivalent_node_Proj(proj);
+