#include "ia32_transform.h"
#include "ia32_dbg_stat.h"
#include "ia32_optimize.h"
+#include "gen_ia32_regalloc_if.h"
/**
* Transforms a Sub or xSub into Neg--Add iff OUT_REG == SRC2_REG.
arch_set_irn_register(cg->arch_env, res, in2_reg);
/* add to schedule */
+ sched_add_before(irn, get_Proj_pred(res));
sched_add_before(irn, res);
/* generate the add */
set_ia32_op_type(irn, ia32_AddrModeD);
set_ia32_pncode(irn, get_inversed_pnc(get_ia32_pncode(irn)));
}
+ }
+end: ;
+}
- /* check if there is a sub which need to be transformed */
- ia32_transform_sub_to_neg_add(irn, cg);
+/**
+ * Following Problem:
+ * We have a source address mode node with base or index register equal to
+ * result register. The constraint handler will insert a copy from the
+ * remaining input operand to the result register -> base or index is
+ * broken then.
+ * Solution: Turn back this address mode into explicit Load + Operation.
+ */
+static void fix_am_source(ir_node *irn, void *env) {
+ ia32_code_gen_t *cg = env;
+ ir_node *base, *index;
+ const arch_register_t *reg_base, *reg_index;
+ const ia32_register_req_t **reqs;
+ int n_res, i;
- /* transform a LEA into an Add if possible */
- ia32_transform_lea_to_add(irn, cg);
- }
-end:
+ /* check only ia32 nodes with source address mode */
+ if (! is_ia32_irn(irn) || get_ia32_op_type(irn) != ia32_AddrModeS)
+ return;
+
+ base = get_irn_n(irn, 0);
+ index = get_irn_n(irn, 1);
+
+ reg_base = arch_get_irn_register(cg->arch_env, base);
+ reg_index = arch_get_irn_register(cg->arch_env, index);
+ reqs = get_ia32_out_req_all(irn);
+
+ n_res = get_ia32_n_res(irn);
+
+ for (i = 0; i < n_res; i++) {
+ if (arch_register_req_is(&(reqs[i]->req), should_be_same)) {
+ /* get in and out register */
+ const arch_register_t *out_reg = get_ia32_out_reg(irn, i);
+
+ /*
+ there is a constraint for the remaining operand
+ and the result register is equal to base or index register
+ */
+ if (reqs[i]->same_pos == 2 &&
+ (REGS_ARE_EQUAL(out_reg, reg_base) || REGS_ARE_EQUAL(out_reg, reg_index)))
+ {
+ /* turn back address mode */
+ ir_node *in_node = get_irn_n(irn, 2);
+ const arch_register_t *in_reg = arch_get_irn_register(cg->arch_env, in_node);
+ ir_node *block = get_nodes_block(irn);
+ ir_mode *ls_mode = get_ia32_ls_mode(irn);
+ ir_node *load;
+ int pnres;
+
+ if (arch_register_get_class(in_reg) == &ia32_reg_classes[CLASS_ia32_gp]) {
+ load = new_rd_ia32_Load(NULL, cg->irg, block, base, index, get_irn_n(irn, 4));
+ pnres = pn_ia32_Load_res;
+ }
+ else if (arch_register_get_class(in_reg) == &ia32_reg_classes[CLASS_ia32_xmm]) {
+ load = new_rd_ia32_xLoad(NULL, cg->irg, block, base, index, get_irn_n(irn, 4));
+ pnres = pn_ia32_xLoad_res;
+ }
+ else {
+ assert(0 && "cannot turn back address mode for this register class");
+ }
+
+ /* copy address mode information to load */
+ set_ia32_ls_mode(load, ls_mode);
+ set_ia32_am_flavour(load, get_ia32_am_flavour(irn));
+ set_ia32_op_type(load, ia32_AddrModeS);
+ set_ia32_am_support(load, ia32_am_Source);
+ set_ia32_am_scale(load, get_ia32_am_scale(irn));
+ set_ia32_am_sc(load, get_ia32_am_sc(irn));
+ add_ia32_am_offs(load, get_ia32_am_offs(irn));
+ set_ia32_frame_ent(load, get_ia32_frame_ent(irn));
+
+ if (is_ia32_use_frame(irn))
+ set_ia32_use_frame(load);
+
+ /* insert the load into schedule */
+ sched_add_before(irn, load);
+
+ DBG((cg->mod, LEVEL_3, "irg %+F: build back AM source for node %+F, inserted load %+F\n", cg->irg, irn, load));
+
+ load = new_r_Proj(cg->irg, block, load, ls_mode, pnres);
+ arch_set_irn_register(cg->arch_env, load, out_reg);
+
+ /* insert the load result proj into schedule */
+ sched_add_before(irn, load);
- /* check for peephole optimization */
- ia32_peephole_optimization(irn, cg);
+ /* set the new input operand */
+ set_irn_n(irn, 3, load);
+
+ /* this is a normal node now */
+ set_ia32_op_type(irn, ia32_Normal);
+
+ break;
+ }
+ }
+ }
}
static void ia32_finish_irg_walker(ir_node *block, void *env) {
ir_node *irn, *next;
+ /* first: turn back AM source if necessary */
+ for (irn = sched_first(block); ! sched_is_end(irn); irn = next) {
+ next = sched_next(irn);
+ fix_am_source(irn, env);
+ }
+
+ for (irn = sched_first(block); ! sched_is_end(irn); irn = next) {
+ ia32_code_gen_t *cg = env;
+ next = sched_next(irn);
+
+ if (is_ia32_irn(irn)) {
+ /* check if there is a sub which need to be transformed */
+ ia32_transform_sub_to_neg_add(irn, cg);
+
+ /* transform a LEA into an Add if possible */
+ ia32_transform_lea_to_add(irn, cg);
+
+ /* check for peephole optimization */
+ ia32_peephole_optimization(irn, cg);
+ }
+ }
+
+ /* second: insert copies and finish irg */
for (irn = sched_first(block); ! sched_is_end(irn); irn = next) {
next = sched_next(irn);
ia32_finish_node(irn, env);
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