static ir_node *transform_node_Mux(ir_node *n) {
ir_node *oldn = n, *sel = get_Mux_sel(n);
ir_mode *mode = get_irn_mode(n);
+ ir_node *t = get_Mux_true(n);
+ ir_node *f = get_Mux_false(n);
+ ir_graph *irg = current_ir_graph;
+ ir_node *conds[1], *vals[2];
+ /* first normalization step: move a possible zero to the false case */
+ if (is_Proj(sel)) {
+ ir_node *cmp = get_Proj_pred(sel);
+
+ if (is_Cmp(cmp)) {
+ if (is_Const(t) && is_Const_null(t)) {
+ /* Psi(x, 0, y) => Psi(x, y, 0) */
+ pn_Cmp pnc = get_Proj_proj(sel);
+ sel = new_r_Proj(irg, get_nodes_block(cmp), cmp, mode_b,
+ get_negated_pnc(pnc, get_irn_mode(get_Cmp_left(cmp))));
+ conds[0] = sel;
+ vals[0] = f;
+ vals[1] = t;
+ n = new_rd_Psi(get_irn_dbg_info(n), irg, get_nodes_block(n), 1, conds, vals, mode);
+ t = vals[0];
+ f = vals[1];
+ }
+ }
+ }
+
+ /* note: after normalization, false can only happen on default */
if (mode == mode_b) {
- ir_node *t = get_Mux_true(n);
- ir_node *f = get_Mux_false(n);
dbg_info *dbg = get_irn_dbg_info(n);
- ir_node *block = get_irn_n(n, -1);
+ ir_node *block = get_nodes_block(n);
ir_graph *irg = current_ir_graph;
if (is_Const(t)) {
DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_OR_BOOL);
return n;
}
- } else {
- ir_node* not_sel = new_rd_Not(dbg, irg, block, sel, mode_b);
- assert(tv_t == tarval_b_false);
- if (is_Const(f)) {
- /* Muxb(sel, false, true) = Not(sel) */
- assert(get_Const_tarval(f) == tarval_b_true);
- DBG_OPT_ALGSIM0(oldn, not_sel, FS_OPT_MUX_NOT_BOOL);
- return not_sel;
- } else {
- /* Muxb(sel, false, x) = And(Not(sel), x) */
- n = new_rd_And(dbg, irg, block, not_sel, f, mode_b);
- DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_ANDNOT_BOOL);
- return n;
- }
}
} else if (is_Const(f)) {
tarval *tv_f = get_Const_tarval(f);
}
}
+ /* more normalization: try to normalize Mux(x, C1, C2) into Mux(x, +1/-1, 0) op C2 */
+ if (is_Const(t) && is_Const(f) && mode_is_int(mode)) {
+ tarval *a = get_Const_tarval(t);
+ tarval *b = get_Const_tarval(f);
+ tarval *null = get_tarval_null(mode);
+ tarval *diff, *min;
+
+ if (tarval_cmp(a, b) & pn_Cmp_Gt) {
+ diff = tarval_sub(a, b);
+ min = b;
+ } else {
+ diff = tarval_sub(b, a);
+ min = a;
+ }
+
+ if (diff == get_tarval_one(mode) && min != null) {
+ dbg_info *dbg = get_irn_dbg_info(n);
+ ir_node *block = get_nodes_block(n);
+ ir_graph *irg = current_ir_graph;
+
+
+ conds[0] = sel;
+ vals[0] = new_Const(mode, tarval_sub(a, min));
+ vals[1] = new_Const(mode, tarval_sub(b, min));
+ n = new_rd_Psi(dbg, irg, block, 1, conds, vals, mode);
+ n = new_rd_Add(dbg, irg, block, n, new_Const(mode, min), mode);
+ return n;
+ }
+ }
+
if (is_Proj(sel)) {
ir_node *cmp = get_Proj_pred(sel);
long pn = get_Proj_proj(sel);
- ir_node *f = get_Mux_false(n);
- ir_node *t = get_Mux_true(n);
/*
* Note: normalization puts the constant on the right side,
if (mode_is_int(mode)) {
/* integer only */
- if (pn == pn_Cmp_Eq) {
- ir_node *tmp = t;
- t = f;
- f = tmp;
- pn = pn_Cmp_Lg;
- }
- if (pn == pn_Cmp_Lg && is_And(cmp_l)) {
+ if ((pn == pn_Cmp_Lg || pn == pn_Cmp_Eq) && is_And(cmp_l)) {
/* Psi((a & b) != 0, c, 0) */
ir_node *and_r = get_And_right(cmp_l);
ir_node *and_l;
if (and_r == t && f == cmp_r) {
if (is_Const(t) && tarval_is_single_bit(get_Const_tarval(t))) {
- /* Psi((a & 2^C) != 0, 2^C, 0) */
- n = cmp_l;
- return n;
- }
- }
- if (and_r == f && t == cmp_r) {
- if (is_Const(f) && tarval_is_single_bit(get_Const_tarval(f))) {
- /* Psi((a & 2^C) != 0, 0, 2^C) */
- n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph,
- block, cmp_l, f, mode);
+ if (pn == pn_Cmp_Lg) {
+ /* Psi((a & 2^C) != 0, 2^C, 0) */
+ n = cmp_l;
+ } else {
+ /* Psi((a & 2^C) == 0, 2^C, 0) */
+ n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph,
+ block, cmp_l, t, mode);
+ }
return n;
}
}
ir_node *shl_l = get_Shl_left(and_r);
if (is_Const(shl_l) && is_Const_one(shl_l)) {
if (and_r == t && f == cmp_r) {
- /* (a & (1 << n)) != 0, (1 << n), 0) */
- n = cmp_l;
- return n;
- }
- else if (and_r == f && t == cmp_r) {
- /* (a & (1 << n)) != 0, 0, (1 << n)) */
- n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph,
- block, cmp_l, f, mode);
+ if (pn == pn_Cmp_Lg) {
+ /* (a & (1 << n)) != 0, (1 << n), 0) */
+ n = cmp_l;
+ } else {
+ /* (a & (1 << n)) == 0, (1 << n), 0) */
+ n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph,
+ block, cmp_l, t, mode);
+ }
return n;
}
}
ir_node *shl_l = get_Shl_left(and_l);
if (is_Const(shl_l) && is_Const_one(shl_l)) {
if (and_l == t && f == cmp_r) {
- /* ((1 << n) & a) != 0, (1 << n), 0) */
- n = cmp_l;
- return n;
- }
- else if (and_l == f && t == cmp_r) {
- /* ((1 << n) & a) != 0, 0, (1 << n)) */
- n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph,
- block, cmp_l, f, mode);
+ if (pn == pn_Cmp_Lg) {
+ /* ((1 << n) & a) != 0, (1 << n), 0) */
+ n = cmp_l;
+ } else {
+ /* ((1 << n) & a) == 0, (1 << n), 0) */
+ n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph,
+ block, cmp_l, t, mode);
+ }
return n;
}
}
projects / libfirm / commitdiff