+} /* i_mapper_exp */
+
+/**
+ * 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;
+} /* i_mapper_zero_to_zero */
+
+/**
+ * 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;
+} /* i_mapper_one_to_zero */
+
+/**
+ * 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)
+{
+ ir_node *val = get_Call_param(call, 0);
+ (void) ctx;
+
+ if (is_strictConv(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);
+ if (is_Conv(val)) {
+ /* still a Conv ? */
+ set_Conv_strict(val, 1);
+ }
+ DBG_OPT_ALGSIM2(call, op, call, FS_OPT_RTS_SYMMETRIC);
+ set_Call_param(call, 0, val);
+ }
+ } 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);
+ }
+
+ 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);
+ return 1;
+ }
+ return 0;
+} /* i_mapper_symmetric_zero_to_one */
+
+/* A mapper for the floating point log. */
+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);
+} /* i_mapper_log */
+
+/* A mapper for the floating point sin. */
+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);
+} /* i_mapper_sin */
+
+/* A mapper for the floating point cos. */
+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);
+} /* i_mapper_cos */
+
+/* A mapper for the floating point tan. */
+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);
+} /* i_mapper_tan */
+
+/* A mapper for the floating point asin. */
+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);
+} /* i_mapper_asin */
+
+/* A mapper for the floating point acos. */
+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);
+} /* i_mapper_acos */
+
+/* A mapper for the floating point atan. */
+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);
+} /* i_mapper_atan */
+
+/* A mapper for the floating point sinh. */
+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);
+} /* i_mapper_sinh */
+
+/* A mapper for the floating point cosh. */
+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);
+} /* i_mapper_cosh */
+
+/* A mapper for the floating point tanh. */
+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);
+} /* i_mapper_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_Global(ptr)) {
+ ir_entity *ent = get_Global_entity(ptr);
+
+ if (get_entity_linkage(ent) & IR_LINKAGE_CONSTANT) {
+ /* a constant entity */
+ return ent;
+ }
+ }
+ return NULL;
+} /* get_const_entity */
+
+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);