+ * Simulate a virtual fisttp.
+ *
+ * @param state the x87 state
+ * @param n the node that should be simulated (and patched)
+ *
+ * @return NO_NODE_ADDED
+ */
+static int sim_fisttp(x87_state *state, ir_node *n)
+{
+ ir_node *val = get_irn_n(n, n_ia32_vfst_val);
+ const arch_register_t *op2 = x87_get_irn_register(val);
+ ia32_x87_attr_t *attr;
+ int op2_reg_idx, op2_idx, depth;
+
+ op2_reg_idx = arch_register_get_index(op2);
+ if (op2_reg_idx == REG_VFP_UKNWN) {
+ /* just take any value from stack */
+ if (state->depth > 0) {
+ op2_idx = 0;
+ DEBUG_ONLY(op2 = NULL);
+ } else {
+ /* produce a new value which we will consume immediately */
+ x87_create_fldz(state, n, op2_reg_idx);
+ op2_idx = x87_on_stack(state, op2_reg_idx);
+ assert(op2_idx >= 0);
+ }
+ } else {
+ op2_idx = x87_on_stack(state, op2_reg_idx);
+ DB((dbg, LEVEL_1, ">>> %+F %s ->\n", n, arch_register_get_name(op2)));
+ assert(op2_idx >= 0);
+ }
+
+ depth = x87_get_depth(state);
+
+ /* Note: although the value is still live here, it is destroyed because
+ of the pop. The register allocator is aware of that and introduced a copy
+ if the value must be alive. */
+
+ /* we can only store the tos to memory */
+ if (op2_idx != 0)
+ x87_create_fxch(state, n, op2_idx);
+
+ x87_pop(state);
+ x87_patch_insn(n, op_ia32_fisttp);
+
+ attr = get_ia32_x87_attr(n);
+ attr->x87[1] = op2 = &ia32_st_regs[0];
+ DB((dbg, LEVEL_1, "<<< %s %s ->\n", get_irn_opname(n), arch_register_get_name(op2)));
+
+ return NO_NODE_ADDED;
+} /* sim_fisttp */
+
+/**
+ * Simulate a virtual FtstFnstsw.