+int i_mapper_exp2(ir_node *call, void *ctx)
+{
+ return i_mapper_exp(call, ctx);
+}
+
+int i_mapper_exp10(ir_node *call, void *ctx)
+{
+ return i_mapper_exp(call, ctx);
+}
+
+/**
+ * A mapper for mapping f(0.0) to 0.0.
+ */
+static int i_mapper_zero_to_zero(ir_node *call, void *ctx, int reason)
+{
+ ir_node *val = get_Call_param(call, 0);
+ (void) ctx;
+
+ if (is_Const(val) && is_Const_null(val)) {
+ /* f(0.0) = 0.0 */
+ ir_node *mem = get_Call_mem(call);
+ DBG_OPT_ALGSIM0(call, val, reason);
+ replace_call(val, call, mem, NULL, NULL);
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * A mapper for mapping f(1.0) to 0.0.
+ */
+static int i_mapper_one_to_zero(ir_node *call, void *ctx, int reason)
+{
+ ir_node *val = get_Call_param(call, 0);
+ (void) ctx;
+
+ if (is_Const(val) && is_Const_one(val)) {
+ /* acos(1.0) = 0.0 */
+ ir_graph *irg = get_irn_irg(val);
+ ir_mode *mode = get_irn_mode(val);
+ ir_node *irn = new_r_Const(irg, get_mode_null(mode));
+ ir_node *mem = get_Call_mem(call);
+ DBG_OPT_ALGSIM0(call, irn, reason);
+ replace_call(irn, call, mem, NULL, NULL);
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * A mapper for mapping a functions with the following characteristics:
+ * f(-x) = f(x).
+ * f(0.0) = 1.0
+ */
+static int i_mapper_symmetric_zero_to_one(ir_node *call, void *ctx, int reason)
+{
+ int changed = 0;
+ ir_node *val = get_Call_param(call, 0);
+ (void) ctx;
+
+ if (is_Conv(val)) {
+ ir_node *op = get_Conv_op(val);
+ if (is_Minus(op)) {
+ /* f(-x) = f(x) with strictConv */
+ ir_node *block = get_nodes_block(call);
+ ir_mode *mode = get_irn_mode(val);
+ dbg_info *dbg = get_irn_dbg_info(val);
+
+ op = get_Minus_op(op);
+ val = new_rd_Conv(dbg, block, op, mode);
+ DBG_OPT_ALGSIM2(call, op, call, FS_OPT_RTS_SYMMETRIC);
+ set_Call_param(call, 0, val);
+ changed = 1;
+ }
+ } else if (is_Minus(val)) {
+ /* f(-x) = f(x) */
+ val = get_Minus_op(val);
+ DBG_OPT_ALGSIM2(call, val, call, FS_OPT_RTS_SYMMETRIC);
+ set_Call_param(call, 0, val);
+ changed = 1;
+ }
+
+ if (is_Const(val) && is_Const_null(val)) {
+ /* f(0.0) = 1.0 */
+ ir_graph *irg = get_irn_irg(val);
+ ir_mode *mode = get_irn_mode(val);
+ ir_node *irn = new_r_Const(irg, get_mode_one(mode));
+ ir_node *mem = get_Call_mem(call);
+ DBG_OPT_ALGSIM0(call, irn, reason);
+ replace_call(irn, call, mem, NULL, NULL);
+ changed = 1;
+ }
+ return changed;
+}
+
+int i_mapper_log(ir_node *call, void *ctx)
+{
+ /* log(1.0) = 0.0 */
+ return i_mapper_one_to_zero(call, ctx, FS_OPT_RTS_LOG);
+}
+
+int i_mapper_log2(ir_node *call, void *ctx)
+{
+ /* log2(1.0) = 0.0 */
+ return i_mapper_one_to_zero(call, ctx, FS_OPT_RTS_LOG);
+}
+
+int i_mapper_log10(ir_node *call, void *ctx)
+{
+ /* log10(1.0) = 0.0 */
+ return i_mapper_one_to_zero(call, ctx, FS_OPT_RTS_LOG);
+}
+
+int i_mapper_sin(ir_node *call, void *ctx)
+{
+ /* sin(0.0) = 0.0 */
+ return i_mapper_zero_to_zero(call, ctx, FS_OPT_RTS_SIN);
+}
+
+int i_mapper_cos(ir_node *call, void *ctx)
+{
+ /* cos(0.0) = 1.0, cos(-x) = x */
+ return i_mapper_symmetric_zero_to_one(call, ctx, FS_OPT_RTS_COS);
+}
+
+int i_mapper_tan(ir_node *call, void *ctx)
+{
+ /* tan(0.0) = 0.0 */
+ return i_mapper_zero_to_zero(call, ctx, FS_OPT_RTS_TAN);
+}
+
+int i_mapper_asin(ir_node *call, void *ctx)
+{
+ /* asin(0.0) = 0.0 */
+ return i_mapper_zero_to_zero(call, ctx, FS_OPT_RTS_ASIN);
+}
+
+int i_mapper_acos(ir_node *call, void *ctx)
+{
+ /* acos(1.0) = 0.0 */
+ return i_mapper_one_to_zero(call, ctx, FS_OPT_RTS_ACOS);
+}
+
+int i_mapper_atan(ir_node *call, void *ctx)
+{
+ /* atan(0.0) = 0.0 */
+ return i_mapper_zero_to_zero(call, ctx, FS_OPT_RTS_ATAN);
+}
+
+int i_mapper_sinh(ir_node *call, void *ctx)
+{
+ /* sinh(0.0) = 0.0 */
+ return i_mapper_zero_to_zero(call, ctx, FS_OPT_RTS_SINH);
+}
+
+int i_mapper_cosh(ir_node *call, void *ctx)
+{
+ /* cosh(0.0) = 1.0, cosh(-x) = x */
+ return i_mapper_symmetric_zero_to_one(call, ctx, FS_OPT_RTS_COSH);
+}
+
+int i_mapper_tanh(ir_node *call, void *ctx)
+{
+ /* tanh(0.0) = 0.0 */
+ return i_mapper_zero_to_zero(call, ctx, FS_OPT_RTS_TANH);
+}
+
+/**
+ * Return the const entity that is accessed through the pointer ptr or
+ * NULL if there is no entity (or the entity is not constant).
+ *
+ * @param ptr the pointer
+ */
+static ir_entity *get_const_entity(ir_node *ptr)
+{
+ if (is_SymConst_addr_ent(ptr)) {
+ ir_entity *ent = get_SymConst_entity(ptr);
+
+ if (get_entity_linkage(ent) & IR_LINKAGE_CONSTANT) {
+ /* a constant entity */
+ return ent;
+ }
+ }
+ return NULL;
+}
+
+static ir_tarval *get_initializer_value(ir_initializer_t *const init, ir_mode *const mode)
+{
+ switch (get_initializer_kind(init)) {
+ case IR_INITIALIZER_NULL:
+ return get_mode_null(mode);
+
+ case IR_INITIALIZER_TARVAL:
+ return get_initializer_tarval_value(init);
+
+ case IR_INITIALIZER_CONST: {
+ ir_node *const irn = get_initializer_const_value(init);
+ if (is_Const(irn))
+ return get_Const_tarval(irn);
+ break;
+ }
+
+ case IR_INITIALIZER_COMPOUND:
+ break;
+ }
+
+ return get_tarval_undefined();
+}
+
+static bool initializer_val_is_null(ir_initializer_t *init)
+{
+ ir_tarval *tv;
+
+ if (get_initializer_kind(init) == IR_INITIALIZER_NULL)
+ return true;
+
+ if (get_initializer_kind(init) == IR_INITIALIZER_TARVAL) {
+ tv = get_initializer_tarval_value(init);
+ } else if (get_initializer_kind(init) == IR_INITIALIZER_CONST) {
+ ir_node *irn = get_initializer_const_value(init);
+ if (!is_Const(irn))
+ return false;
+ tv = get_Const_tarval(irn);
+ } else {
+ return false;
+ }
+
+ return tarval_is_null(tv);
+}
+
+/**
+ * Calculate the value of strlen if possible.
+ *
+ * @param ent the entity
+ * @param res_tp the result type
+ *
+ * @return a Const node containing the strlen() result or NULL
+ * if the evaluation fails
+ */
+static ir_node *eval_strlen(ir_graph *irg, ir_entity *ent, ir_type *res_tp)
+{
+ ir_type *tp = get_entity_type(ent);
+ ir_mode *mode;
+ ir_initializer_t *initializer;
+ size_t size;
+ size_t i;
+
+ if (! is_Array_type(tp))
+ return NULL;
+ tp = get_array_element_type(tp);
+ if (! is_Primitive_type(tp))
+ return NULL;
+ mode = get_type_mode(tp);
+
+ /* FIXME: This is too restrict, as the type char might be more the 8bits */
+ if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
+ return NULL;
+
+ initializer = get_entity_initializer(ent);
+ if (get_initializer_kind(initializer) != IR_INITIALIZER_COMPOUND)
+ return NULL;
+
+ size = get_initializer_compound_n_entries(initializer);
+ for (i = 0; i < size; ++i) {
+ ir_initializer_t *val = get_initializer_compound_value(initializer, i);
+ if (initializer_val_is_null(val)) {
+ ir_tarval *tv = new_tarval_from_long(i, get_type_mode(res_tp));
+ return new_r_Const(irg, tv);
+ }
+ }
+
+ return NULL;
+}
+
+int i_mapper_strlen(ir_node *call, void *ctx)
+{
+ ir_node *s = get_Call_param(call, 0);
+ ir_entity *ent = get_const_entity(s);
+
+ (void) ctx;
+
+ /* FIXME: this cannot handle constant strings inside struct initializers yet */
+ if (ent != NULL) {
+ /* a constant entity */
+ ir_type *tp = get_Call_type(call);
+ ir_node *irn;
+
+ tp = get_method_res_type(tp, 0);
+ irn = eval_strlen(get_irn_irg(call), ent, tp);
+
+ if (irn) {
+ ir_node *mem = get_Call_mem(call);
+ DBG_OPT_ALGSIM0(call, irn, FS_OPT_RTS_STRLEN);
+ replace_call(irn, call, mem, NULL, NULL);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/**
+ * Calculate the value of strlen if possible.
+ *
+ * @param left the left entity
+ * @param right the right entity
+ * @param res_tp the result type
+ *
+ * @return a Const node containing the strcmp() result or NULL
+ * if the evaluation fails
+ */
+static ir_node *eval_strcmp(ir_graph *irg, ir_entity *left, ir_entity *right,
+ ir_type *res_tp)
+{
+ ir_type *tp;
+ ir_mode *mode;
+ ir_initializer_t *init_l;
+ ir_initializer_t *init_r;
+ size_t size_l;
+ size_t size_r;
+ size_t size;
+ size_t i;
+
+ tp = get_entity_type(left);
+ if (! is_Array_type(tp))
+ return NULL;
+ tp = get_array_element_type(tp);
+ if (! is_Primitive_type(tp))
+ return NULL;
+ mode = get_type_mode(tp);
+
+ /* FIXME: This is too restrict, as the type char might be more the 8bits */
+ if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
+ return NULL;
+
+ tp = get_entity_type(right);
+ if (! is_Array_type(tp))
+ return NULL;
+ tp = get_array_element_type(tp);
+ if (! is_Primitive_type(tp))
+ return NULL;
+ mode = get_type_mode(tp);
+
+ /* FIXME: This is too restrict, as the type char might be more the 8bits */
+ if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
+ return NULL;
+
+ init_l = get_entity_initializer(left);
+ init_r = get_entity_initializer(right);
+ if (get_initializer_kind(init_l) != IR_INITIALIZER_COMPOUND ||
+ get_initializer_kind(init_r) != IR_INITIALIZER_COMPOUND)
+ return NULL;
+
+ size_l = get_initializer_compound_n_entries(init_l);
+ size_r = get_initializer_compound_n_entries(init_r);
+ size = size_l < size_r ? size_l : size_r;
+
+ for (i = 0; i != size; ++i) {
+ ir_initializer_t *const val_l = get_initializer_compound_value(init_l, i);
+ ir_tarval *const tv_l = get_initializer_value(val_l, mode);
+ ir_initializer_t *const val_r = get_initializer_compound_value(init_r, i);
+ ir_tarval *const tv_r = get_initializer_value(val_r, mode);
+
+ if (!tarval_is_constant(tv_l) || !tarval_is_constant(tv_r))
+ return NULL;
+
+ if (tv_l != tv_r) {
+ ir_mode *const res_mode = get_type_mode(res_tp);
+ ir_tarval *const res_l = tarval_convert_to(tv_l, res_mode);
+ ir_tarval *const res_r = tarval_convert_to(tv_r, res_mode);
+ ir_tarval *const tv = tarval_sub(res_l, res_r, res_mode);
+ return new_r_Const(irg, tv);
+ }
+
+ if (tarval_is_null(tv_l)) {
+ ir_tarval *const tv = get_mode_null(get_type_mode(res_tp));
+ return new_r_Const(irg, tv);
+ }
+ }
+
+ return NULL;
+}
+
+/**
+ * Checks if an entity represents the empty string.
+ *
+ * @param ent the entity
+ *
+ * @return non-zero if ent represents the empty string
+ */
+static int is_empty_string(ir_entity *ent)
+{
+ ir_type *tp = get_entity_type(ent);
+ ir_mode *mode;
+ ir_initializer_t *initializer;
+ ir_initializer_t *init0;
+
+ if (! is_Array_type(tp))
+ return 0;
+ tp = get_array_element_type(tp);
+ if (! is_Primitive_type(tp))
+ return 0;
+ mode = get_type_mode(tp);
+
+ /* FIXME: This is too restrict, as the type char might be more the 8bits */
+ if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
+ return 0;
+
+ initializer = get_entity_initializer(ent);
+ if (get_initializer_kind(initializer) != IR_INITIALIZER_COMPOUND)
+ return 0;
+
+ if (get_initializer_compound_n_entries(initializer) < 1)
+ return 0;
+
+ init0 = get_initializer_compound_value(initializer, 0);
+ return initializer_val_is_null(init0);
+}
+
+int i_mapper_strcmp(ir_node *call, void *ctx)
+{
+ ir_node *left = get_Call_param(call, 0);
+ ir_node *right = get_Call_param(call, 1);
+ ir_node *irn = NULL;
+ ir_node *exc = NULL;
+ ir_node *reg = NULL;
+ ir_type *call_tp = get_Call_type(call);
+ ir_type *res_tp = get_method_res_type(call_tp, 0);
+ ir_entity *ent_l, *ent_r;
+ ir_type *char_tp;
+ ir_node *v;
+