static tarval *computed_value_Mul(ir_node *n) {
ir_node *a = get_Mul_left(n);
ir_node *b = get_Mul_right(n);
+ ir_mode *mode;
tarval *ta = value_of(a);
tarval *tb = value_of(b);
- if ((ta != tarval_bad) && (tb != tarval_bad) && (get_irn_mode(a) == get_irn_mode(b))) {
+ mode = get_irn_mode(n);
+ if (mode != get_irn_mode(a)) {
+ /* n * n = 2n bit multiplication */
+ ta = tarval_convert_to(ta, mode);
+ tb = tarval_convert_to(tb, mode);
+ }
+
+ if (ta != tarval_bad && tb != tarval_bad) {
return tarval_mul(ta, tb);
} else {
- /* a*0 = 0 or 0*b = 0:
- calls computed_value recursive and returns the 0 with proper
- mode. */
- if ((ta != tarval_bad) && (ta == get_mode_null(get_tarval_mode(ta))))
+ /* a*0 = 0 or 0*b = 0 */
+ if (ta == get_mode_null(mode))
return ta;
- if ((tb != tarval_bad) && (tb == get_mode_null(get_tarval_mode(tb))))
+ if (tb == get_mode_null(mode))
return tb;
}
return tarval_bad;
/** Optimize Not(Not(x)) == x. */
#define equivalent_node_Not equivalent_node_idempotent_unop
-/** --x == x ??? Is this possible or can --x raise an
+/** -(-x) == x ??? Is this possible or can --x raise an
out of bounds exception if min =! max? */
#define equivalent_node_Minus equivalent_node_idempotent_unop
static ir_node *equivalent_node_Mul(ir_node *n) {
ir_node *oldn = n;
ir_node *a = get_Mul_left(n);
- ir_node *b = get_Mul_right(n);
- /* Mul is commutative and has again an other neutral element. */
- if (classify_tarval(value_of(a)) == TV_CLASSIFY_ONE) {
- n = b;
- DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_1);
- } else if (classify_tarval(value_of(b)) == TV_CLASSIFY_ONE) {
- n = a;
- DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_1);
+ /* we can handle here only the n * n = n bit cases */
+ if (get_irn_mode(n) == get_irn_mode(a)) {
+ ir_node *b = get_Mul_right(n);
+
+ /* Mul is commutative and has again an other neutral element. */
+ if (classify_tarval(value_of(a)) == TV_CLASSIFY_ONE) {
+ n = b;
+ DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_1);
+ } else if (classify_tarval(value_of(b)) == TV_CLASSIFY_ONE) {
+ n = a;
+ DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_1);
+ }
}
return n;
} /* equivalent_node_Mul */
ir_mode *a_mode = get_irn_mode(a);
if (n_mode == a_mode) { /* No Conv necessary */
- /* leave strict floating point Conv's */
- if (get_Conv_strict(n))
- return n;
+ if (get_Conv_strict(n)) {
+ /* special case: the predecessor might be a also a Conv */
+ if (is_Conv(a)) {
+ if (! get_Conv_strict(a)) {
+ /* first one is not strict, kick it */
+ set_Conv_op(n, get_Conv_op(a));
+ return n;
+ }
+ /* else both are strict conv, second is superflous */
+ } else {
+ /* leave strict floating point Conv's */
+ return n;
+ }
+ }
n = a;
DBG_OPT_ALGSIM0(oldn, n, FS_OPT_CONV);
} else if (get_irn_op(a) == op_Conv) { /* Conv(Conv(b)) */
if (n_mode == mode_b) {
n = b; /* Convb(Conv*(xxxb(...))) == xxxb(...) */
DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_CONV);
- } else if (mode_is_int(n_mode) || mode_is_character(n_mode)) {
+ } else if (mode_is_int(n_mode)) {
if (smaller_mode(b_mode, a_mode)){
n = b; /* ConvS(ConvL(xxxS(...))) == xxxS(...) */
DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_CONV);
/*
* One could expect that we simply return the previous
* Bound here. However, this would be wrong, as we could
- * add an exception Proj to a new location than.
- * So, we must turn in into a tuple
+ * add an exception Proj to a new location then.
+ * So, we must turn in into a tuple.
*/
ret_tuple = 1;
}
return c; \
}
-#define HANDLE_UNOP_PHI(op,a,c) \
- c = NULL; \
- if (is_const_Phi(a)) { \
- /* check for Op(Phi) */ \
- c = apply_unop_on_phi(a, op); \
- } \
- if (c) { \
- DBG_OPT_ALGSIM0(oldn, c, FS_OPT_CONST_PHI); \
- return c; \
+#define HANDLE_UNOP_PHI(op,a,c) \
+ c = NULL; \
+ if (is_const_Phi(a)) { \
+ /* check for Op(Phi) */ \
+ c = apply_unop_on_phi(a, op); \
+ if (c) { \
+ DBG_OPT_ALGSIM0(oldn, c, FS_OPT_CONST_PHI); \
+ return c; \
+ } \
}
-
/**
* Do the AddSub optimization, then Transform
* Constant folding on Phi
return n;
if (mode_is_num(mode)) {
- if (a == b) {
+ /* the following code leads to endless recursion when Mul are replaced by a simple instruction chain */
+ if (!get_opt_arch_dep_running() && a == b && mode_is_int(mode)) {
ir_node *block = get_irn_n(n, -1);
n = new_rd_Mul(
new_r_Const_long(current_ir_graph, block, mode, 2),
mode);
DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_A_A);
- } else if (get_irn_op(a) == op_Minus) {
+ return n;
+ }
+ if (is_Minus(a)) {
n = new_rd_Sub(
get_irn_dbg_info(n),
current_ir_graph,
get_Minus_op(a),
mode);
DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_A_MINUS_B);
- } else if (get_irn_op(b) == op_Minus) {
+ return n;
+ }
+ if (is_Minus(b)) {
n = new_rd_Sub(
get_irn_dbg_info(n),
current_ir_graph,
get_Minus_op(b),
mode);
DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_A_MINUS_B);
+ return n;
}
- /* do NOT execute this code if reassociation is enabled, it does the inverse! */
- else if (!get_opt_reassociation() && get_irn_op(a) == op_Mul) {
- ir_node *ma = get_Mul_left(a);
- ir_node *mb = get_Mul_right(a);
-
- if (b == ma) {
- ir_node *blk = get_irn_n(n, -1);
- n = new_rd_Mul(
- get_irn_dbg_info(n), current_ir_graph, blk,
- ma,
- new_rd_Add(
- get_irn_dbg_info(n), current_ir_graph, blk,
- mb,
- new_r_Const_long(current_ir_graph, blk, mode, 1),
- mode),
- mode);
- DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_MUL_A_X_A);
- } else if (b == mb) {
- ir_node *blk = get_irn_n(n, -1);
- n = new_rd_Mul(
- get_irn_dbg_info(n), current_ir_graph, blk,
- mb,
- new_rd_Add(
+ if (! get_opt_reassociation()) {
+ /* do NOT execute this code if reassociation is enabled, it does the inverse! */
+ if (is_Mul(a)) {
+ ir_node *ma = get_Mul_left(a);
+ ir_node *mb = get_Mul_right(a);
+
+ if (b == ma) {
+ ir_node *blk = get_irn_n(n, -1);
+ n = new_rd_Mul(
get_irn_dbg_info(n), current_ir_graph, blk,
ma,
- new_r_Const_long(current_ir_graph, blk, mode, 1),
- mode),
- mode);
- DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_MUL_A_X_A);
- }
- }
- /* do NOT execute this code if reassociation is enabled, it does the inverse! */
- else if (!get_opt_reassociation() && get_irn_op(b) == op_Mul) {
- ir_node *ma = get_Mul_left(b);
- ir_node *mb = get_Mul_right(b);
-
- if (a == ma) {
- ir_node *blk = get_irn_n(n, -1);
- n = new_rd_Mul(
- get_irn_dbg_info(n), current_ir_graph, blk,
- ma,
- new_rd_Add(
+ new_rd_Add(
+ get_irn_dbg_info(n), current_ir_graph, blk,
+ mb,
+ new_r_Const_long(current_ir_graph, blk, mode, 1),
+ mode),
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_MUL_A_X_A);
+ return n;
+ } else if (b == mb) {
+ ir_node *blk = get_irn_n(n, -1);
+ n = new_rd_Mul(
get_irn_dbg_info(n), current_ir_graph, blk,
mb,
- new_r_Const_long(current_ir_graph, blk, mode, 1),
- mode),
- mode);
- DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_MUL_A_X_A);
- } else if (a == mb) {
- ir_node *blk = get_irn_n(n, -1);
- n = new_rd_Mul(
- get_irn_dbg_info(n), current_ir_graph, blk,
- mb,
- new_rd_Add(
+ new_rd_Add(
+ get_irn_dbg_info(n), current_ir_graph, blk,
+ ma,
+ new_r_Const_long(current_ir_graph, blk, mode, 1),
+ mode),
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_MUL_A_X_A);
+ return n;
+ }
+ }
+ if (is_Mul(b)) {
+ ir_node *ma = get_Mul_left(b);
+ ir_node *mb = get_Mul_right(b);
+
+ if (a == ma) {
+ ir_node *blk = get_irn_n(n, -1);
+ n = new_rd_Mul(
get_irn_dbg_info(n), current_ir_graph, blk,
ma,
- new_r_Const_long(current_ir_graph, blk, mode, 1),
- mode),
- mode);
- DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_MUL_A_X_A);
+ new_rd_Add(
+ get_irn_dbg_info(n), current_ir_graph, blk,
+ mb,
+ new_r_Const_long(current_ir_graph, blk, mode, 1),
+ mode),
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_MUL_A_X_A);
+ return n;
+ }
+ if (a == mb) {
+ ir_node *blk = get_irn_n(n, -1);
+ n = new_rd_Mul(
+ get_irn_dbg_info(n), current_ir_graph, blk,
+ mb,
+ new_rd_Add(
+ get_irn_dbg_info(n), current_ir_graph, blk,
+ ma,
+ new_r_Const_long(current_ir_graph, blk, mode, 1),
+ mode),
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_MUL_A_X_A);
+ return n;
+ }
}
}
/* Here we rely on constants be on the RIGHT side */
- else if (is_Not(a) && classify_Const(b) == CNST_ONE) {
+ if (get_mode_arithmetic(mode) == irma_twos_complement &&
+ is_Not(a) && classify_Const(b) == CNST_ONE) {
/* ~x + 1 = -x */
ir_node *op = get_Not_op(a);
ir_node *blk = get_irn_n(n, -1);
n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, blk, op, mode);
DBG_OPT_ALGSIM0(oldn, n, FS_OPT_NOT_PLUS_1);
+ return n;
}
}
return n;
* Sub(0,a) -> Minus(a)
* Sub(Mul(a, x), a) -> Mul(a, x-1)
* Sub(Sub(x, y), b) -> Sub(x, Add(y,b))
+ * Sub(Add(a, x), x) -> a
+ * Sub(x, Add(x, a)) -> -a
+ * Sub(x, Const) -> Add(x, -Const)
*/
static ir_node *transform_node_Sub(ir_node *n) {
ir_mode *mode;
if (mode_is_float(mode) && (get_irg_fp_model(current_ir_graph) & fp_strict_algebraic))
return n;
+ /* Sub(a, Const) -> Add(a, -Const) */
+ if (is_Const(b) && get_irn_mode(b) != mode_P) {
+ tarval *tv = get_Const_tarval(b);
+
+ tv = tarval_neg(tv);
+ if(tv != tarval_bad) {
+ ir_node *cnst = new_Const(get_irn_mode(b), tv);
+ ir_node *block = get_nodes_block(n);
+ dbg_info *dbgi = get_irn_dbg_info(n);
+ ir_graph *irg = get_irn_irg(n);
+ ir_node *add = new_rd_Add(dbgi, irg, block, a, cnst, mode);
+
+ return add;
+ }
+ }
+
+ /* Beware of Sub(P, P) which cannot be optimized into a simple Minus ... */
+ if (mode_is_num(mode) && mode == get_irn_mode(a) && (classify_Const(a) == CNST_NULL)) {
+ n = new_rd_Minus(
+ get_irn_dbg_info(n),
+ current_ir_graph,
+ get_irn_n(n, -1),
+ b,
+ mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_0_A);
+ return n;
+ }
if (is_Add(a)) {
if (mode_wrap_around(mode)) {
ir_node *left = get_Add_left(a);
ir_node *right = get_Add_right(a);
- /* FIXME: Does the Conv's word only for two complement or generally? */
+ /* FIXME: Does the Conv's work only for two complement or generally? */
if (left == b) {
if (mode != get_irn_mode(right)) {
/* This Sub is an effective Cast */
}
n = right;
DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_SUB);
+ return n;
} else if (right == b) {
if (mode != get_irn_mode(left)) {
/* This Sub is an effective Cast */
}
n = left;
DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_SUB);
+ return n;
+ }
+ }
+ }
+ if (is_Add(b)) {
+ if (mode_wrap_around(mode)) {
+ ir_node *left = get_Add_left(b);
+ ir_node *right = get_Add_right(b);
+
+ /* FIXME: Does the Conv's work only for two complement or generally? */
+ if (left == a) {
+ ir_mode *r_mode = get_irn_mode(right);
+
+ n = new_r_Minus(get_irn_irg(n), get_irn_n(n, -1), right, r_mode);
+ if (mode != r_mode) {
+ /* This Sub is an effective Cast */
+ n = new_r_Conv(get_irn_irg(n), get_irn_n(n, -1), n, mode);
+ }
+ DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_SUB);
+ return n;
+ } else if (right == a) {
+ ir_mode *l_mode = get_irn_mode(left);
+
+ n = new_r_Minus(get_irn_irg(n), get_irn_n(n, -1), left, l_mode);
+ if (mode != l_mode) {
+ /* This Sub is an effective Cast */
+ n = new_r_Conv(get_irn_irg(n), get_irn_n(n, -1), n, mode);
+ }
+ DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_SUB);
+ return n;
}
}
- } else if (mode_is_int(mode) && is_Conv(a) && is_Conv(b)) {
+ }
+ if (mode_is_int(mode) && is_Conv(a) && is_Conv(b)) {
ir_mode *mode = get_irn_mode(a);
if (mode == get_irn_mode(b)) {
}
}
}
- /* Beware of Sub(P, P) which cannot be optimized into a simple Minus ... */
- else if (mode_is_num(mode) && mode == get_irn_mode(a) && (classify_Const(a) == CNST_NULL)) {
- n = new_rd_Minus(
- get_irn_dbg_info(n),
- current_ir_graph,
- get_irn_n(n, -1),
- b,
- mode);
- DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_0_A);
- }
/* do NOT execute this code if reassociation is enabled, it does the inverse! */
- else if (get_opt_reassociation() && get_irn_op(a) == op_Mul) {
+ if (get_opt_reassociation() && get_irn_op(a) == op_Mul) {
ir_node *ma = get_Mul_left(a);
ir_node *mb = get_Mul_right(a);
mode),
mode);
DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_MUL_A_X_A);
+ return n;
} else if (mb == b) {
ir_node *blk = get_irn_n(n, -1);
n = new_rd_Mul(
mode),
mode);
DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_MUL_A_X_A);
+ return n;
}
- } else if (get_irn_op(a) == op_Sub) {
+ }
+ if (is_Sub(a)) {
ir_node *x = get_Sub_left(a);
ir_node *y = get_Sub_right(a);
ir_node *blk = get_irn_n(n, -1);
set_Sub_left(n, x);
set_Sub_right(n, add);
DBG_OPT_ALGSIM0(n, n, FS_OPT_SUB_SUB_X_Y_Z);
+ return n;
}
return n;
} /* transform_node_Sub */
+/**
+ * Several transformation done on n*n=2n bits mul.
+ * These transformations must be done here because new nodes may be produced.
+ */
+static ir_node *transform_node_Mul2n(ir_node *n, ir_mode *mode) {
+ ir_node *oldn = n;
+ ir_node *a = get_Mul_left(n);
+ ir_node *b = get_Mul_right(n);
+ tarval *ta = value_of(a);
+ tarval *tb = value_of(b);
+ ir_mode *smode = get_irn_mode(a);
+
+ if (ta == get_mode_one(smode)) {
+ ir_node *blk = get_irn_n(n, -1);
+ n = new_rd_Conv(get_irn_dbg_info(n), current_ir_graph, blk, b, mode);
+ DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_1);
+ return n;
+ }
+ else if (ta == get_mode_minus_one(smode)) {
+ ir_node *blk = get_irn_n(n, -1);
+ n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, blk, b, smode);
+ n = new_rd_Conv(get_irn_dbg_info(n), current_ir_graph, blk, n, mode);
+ DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS_1);
+ return n;
+ }
+ if (tb == get_mode_one(smode)) {
+ ir_node *blk = get_irn_n(a, -1);
+ n = new_rd_Conv(get_irn_dbg_info(n), current_ir_graph, blk, a, mode);
+ DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_1);
+ return n;
+ }
+ else if (tb == get_mode_minus_one(smode)) {
+ ir_node *blk = get_irn_n(n, -1);
+ n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, blk, a, smode);
+ n = new_rd_Conv(get_irn_dbg_info(n), current_ir_graph, blk, n, mode);
+ DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS_1);
+ return n;
+ }
+ return n;
+}
+
/**
* Transform Mul(a,-1) into -a.
* Do constant evaluation of Phi nodes.
*/
static ir_node *transform_node_Mul(ir_node *n) {
ir_node *c, *oldn = n;
+ ir_mode *mode = get_irn_mode(n);
ir_node *a = get_Mul_left(n);
ir_node *b = get_Mul_right(n);
- ir_mode *mode;
+
+ if (mode != get_irn_mode(a))
+ return transform_node_Mul2n(n, mode);
HANDLE_BINOP_PHI(tarval_mul, a,b,c);
- mode = get_irn_mode(n);
if (mode_is_signed(mode)) {
ir_node *r = NULL;
return n;
}
}
+ if (get_mode_arithmetic(mode) == irma_ieee754) {
+ if (is_Const(a)) {
+ tarval *tv = get_Const_tarval(a);
+ if (tarval_ieee754_get_exponent(tv) == 1 && tarval_ieee754_zero_mantissa(tv)) {
+ n = new_rd_Add(get_irn_dbg_info(n), current_ir_graph, get_irn_n(n, -1), b, b, mode);
+ DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_A_A);
+ return n;
+ }
+ }
+ else if (is_Const(b)) {
+ tarval *tv = get_Const_tarval(b);
+ if (tarval_ieee754_get_exponent(tv) == 1 && tarval_ieee754_zero_mantissa(tv)) {
+ n = new_rd_Add(get_irn_dbg_info(n), current_ir_graph, get_irn_n(n, -1), a, a, mode);
+ DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_A_A);
+ return n;
+ }
+ }
+ }
return arch_dep_replace_mul_with_shifts(n);
} /* transform_node_Mul */
*/
static ir_node *transform_node_Div(ir_node *n) {
tarval *tv = value_of(n);
+ ir_mode *mode = get_Div_resmode(n);
ir_node *value = n;
- /* BEWARE: it is NOT possible to optimize a/a to 1, as this may cause a exception */
-
if (tv != tarval_bad) {
value = new_Const(get_tarval_mode(tv), tv);
DBG_OPT_CSTEVAL(n, value);
- } else /* Try architecture dependent optimization */
- value = arch_dep_replace_div_by_const(n);
+ goto make_tuple;
+ } else {
+ ir_node *a = get_Div_left(n);
+ ir_node *b = get_Div_right(n);
+ ir_node *dummy;
+
+ if (a == b && value_not_zero(a, &dummy)) {
+ /* BEWARE: we can optimize a/a to 1 only if this cannot cause a exception */
+ value = new_Const(mode, get_mode_one(mode));
+ DBG_OPT_CSTEVAL(n, value);
+ goto make_tuple;
+ } else {
+ if (mode_is_signed(mode) && is_Const(b)) {
+ tarval *tv = get_Const_tarval(b);
+
+ if (tv == get_mode_minus_one(mode)) {
+ /* a / -1 */
+ value = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, get_irn_n(n, -1), a, mode);
+ DBG_OPT_CSTEVAL(n, value);
+ goto make_tuple;
+ }
+ }
+ /* Try architecture dependent optimization */
+ value = arch_dep_replace_div_by_const(n);
+ }
+ }
if (value != n) {
+ ir_node *mem, *blk;
+
+make_tuple:
/* Turn Div into a tuple (mem, jmp, bad, value) */
- ir_node *mem = get_Div_mem(n);
- ir_node *blk = get_irn_n(n, -1);
+ mem = get_Div_mem(n);
+ blk = get_irn_n(n, -1);
+ /* skip a potential Pin */
+ if (is_Pin(mem))
+ mem = get_Pin_op(mem);
turn_into_tuple(n, pn_Div_max);
set_Tuple_pred(n, pn_Div_M, mem);
set_Tuple_pred(n, pn_Div_X_regular, new_r_Jmp(current_ir_graph, blk));
*/
static ir_node *transform_node_Mod(ir_node *n) {
tarval *tv = value_of(n);
+ ir_mode *mode = get_Mod_resmode(n);
ir_node *value = n;
- /* BEWARE: it is NOT possible to optimize a%a to 0, as this may cause a exception */
-
if (tv != tarval_bad) {
value = new_Const(get_tarval_mode(tv), tv);
DBG_OPT_CSTEVAL(n, value);
- } else /* Try architecture dependent optimization */
- value = arch_dep_replace_mod_by_const(n);
+ goto make_tuple;
+ } else {
+ ir_node *a = get_Mod_left(n);
+ ir_node *b = get_Mod_right(n);
+ ir_node *dummy;
+
+ if (a == b && value_not_zero(a, &dummy)) {
+ /* BEWARE: we can optimize a%a to 0 only if this cannot cause a exception */
+ value = new_Const(mode, get_mode_null(mode));
+ DBG_OPT_CSTEVAL(n, value);
+ goto make_tuple;
+ } else {
+ if (mode_is_signed(mode) && is_Const(b)) {
+ tarval *tv = get_Const_tarval(b);
+
+ if (tv == get_mode_minus_one(mode)) {
+ /* a % -1 = 0 */
+ value = new_Const(mode, get_mode_null(mode));
+ DBG_OPT_CSTEVAL(n, value);
+ goto make_tuple;
+ }
+ }
+ /* Try architecture dependent optimization */
+ value = arch_dep_replace_mod_by_const(n);
+ }
+ }
if (value != n) {
+ ir_node *mem, *blk;
+
+make_tuple:
/* Turn Mod into a tuple (mem, jmp, bad, value) */
- ir_node *mem = get_Mod_mem(n);
- ir_node *blk = get_irn_n(n, -1);
+ mem = get_Mod_mem(n);
+ blk = get_irn_n(n, -1);
+ /* skip a potential Pin */
+ if (is_Pin(mem))
+ mem = get_Pin_op(mem);
turn_into_tuple(n, pn_Mod_max);
set_Tuple_pred(n, pn_Mod_M, mem);
set_Tuple_pred(n, pn_Mod_X_regular, new_r_Jmp(current_ir_graph, blk));
* Transform a DivMod node.
*/
static ir_node *transform_node_DivMod(ir_node *n) {
- int evaluated = 0;
-
+ ir_node *dummy;
ir_node *a = get_DivMod_left(n);
ir_node *b = get_DivMod_right(n);
- ir_mode *mode = get_irn_mode(a);
+ ir_mode *mode = get_DivMod_resmode(n);
tarval *ta = value_of(a);
tarval *tb = value_of(b);
-
- if (!(mode_is_int(mode) && mode_is_int(get_irn_mode(b))))
- return n;
-
- /* BEWARE: it is NOT possible to optimize a/a to 1, as this may cause a exception */
+ int evaluated = 0;
if (tb != tarval_bad) {
if (tb == get_mode_one(get_tarval_mode(tb))) {
- b = new_Const (mode, get_mode_null(mode));
- evaluated = 1;
-
+ b = new_Const(mode, get_mode_null(mode));
DBG_OPT_CSTEVAL(n, b);
+ goto make_tuple;
} else if (ta != tarval_bad) {
tarval *resa, *resb;
- resa = tarval_div (ta, tb);
+ resa = tarval_div(ta, tb);
if (resa == tarval_bad) return n; /* Causes exception!!! Model by replacing through
Jmp for X result!? */
- resb = tarval_mod (ta, tb);
+ resb = tarval_mod(ta, tb);
if (resb == tarval_bad) return n; /* Causes exception! */
- a = new_Const (mode, resa);
- b = new_Const (mode, resb);
- evaluated = 1;
-
+ a = new_Const(mode, resa);
+ b = new_Const(mode, resb);
DBG_OPT_CSTEVAL(n, a);
DBG_OPT_CSTEVAL(n, b);
+ goto make_tuple;
+ } else if (mode_is_signed(mode) && tb == get_mode_minus_one(mode)) {
+ a = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, get_irn_n(n, -1), a, mode);
+ b = new_Const(mode, get_mode_null(mode));
+ DBG_OPT_CSTEVAL(n, a);
+ DBG_OPT_CSTEVAL(n, b);
+ goto make_tuple;
} else { /* Try architecture dependent optimization */
arch_dep_replace_divmod_by_const(&a, &b, n);
evaluated = a != NULL;
}
- } else if (ta == get_mode_null(mode)) {
+ } else if (a == b) {
+ if (value_not_zero(a, &dummy)) {
+ /* a/a && a != 0 */
+ a = new_Const(mode, get_mode_one(mode));
+ b = new_Const(mode, get_mode_null(mode));
+ DBG_OPT_CSTEVAL(n, a);
+ DBG_OPT_CSTEVAL(n, b);
+ goto make_tuple;
+ } else {
+ /* BEWARE: it is NOT possible to optimize a/a to 1, as this may cause a exception */
+ return n;
+ }
+ } else if (ta == get_mode_null(mode) && value_not_zero(b, &dummy)) {
/* 0 / non-Const = 0 */
b = a;
- evaluated = 1;
+ goto make_tuple;
}
if (evaluated) { /* replace by tuple */
- ir_node *mem = get_DivMod_mem(n);
- ir_node *blk = get_irn_n(n, -1);
+ ir_node *mem, *blk;
+
+make_tuple:
+ mem = get_DivMod_mem(n);
+ /* skip a potential Pin */
+ if (is_Pin(mem))
+ mem = get_Pin_op(mem);
+
+ blk = get_irn_n(n, -1);
turn_into_tuple(n, pn_DivMod_max);
set_Tuple_pred(n, pn_DivMod_M, mem);
set_Tuple_pred(n, pn_DivMod_X_regular, new_r_Jmp(current_ir_graph, blk));
return n;
} /* transform_node_DivMod */
+/**
+ * Optimize x / c to x * (1/c)
+ */
+static ir_node *transform_node_Quot(ir_node *n) {
+ ir_mode *mode = get_Quot_resmode(n);
+ ir_node *oldn = n;
+
+ if (get_mode_arithmetic(mode) == irma_ieee754) {
+ ir_node *b = get_Quot_right(n);
+
+ if (is_Const(b)) {
+ tarval *tv = get_Const_tarval(b);
+
+ tv = tarval_quo(get_mode_one(mode), tv);
+
+ /* Do the transformation if the result is either exact or we are not
+ using strict rules. */
+ if (tv != tarval_bad &&
+ (tarval_ieee754_get_exact() || (get_irg_fp_model(current_ir_graph) & fp_strict_algebraic) == 0)) {
+ ir_node *blk = get_irn_n(n, -1);
+ ir_node *c = new_r_Const(current_ir_graph, blk, mode, tv);
+ ir_node *a = get_Quot_left(n);
+ ir_node *m = new_rd_Mul(get_irn_dbg_info(n), current_ir_graph, blk, a, c, mode);
+ ir_node *mem = get_Quot_mem(n);
+
+ /* skip a potential Pin */
+ if (is_Pin(mem))
+ mem = get_Pin_op(mem);
+ turn_into_tuple(n, pn_Quot_max);
+ set_Tuple_pred(n, pn_Quot_M, mem);
+ set_Tuple_pred(n, pn_Quot_X_regular, new_r_Jmp(current_ir_graph, blk));
+ set_Tuple_pred(n, pn_Quot_X_except, new_r_Bad(current_ir_graph));
+ set_Tuple_pred(n, pn_Quot_res, m);
+ DBG_OPT_ALGSIM1(oldn, a, b, m, FS_OPT_FP_INV_MUL);
+ }
+ }
+ }
+ return n;
+} /* transform_node_Quot */
+
/**
* Optimize Abs(x) into x if x is Confirmed >= 0
* Optimize Abs(x) into -x if x is Confirmed <= 0
/**
* makes use of distributive laws for and, or, eor
* and(a OP c, b OP c) -> and(a, b) OP c
+ * note, might return a different op than n
*/
static ir_node *transform_bitwise_distributive(ir_node *n,
recursive_transform trans_func)
HANDLE_BINOP_PHI(tarval_and, a,b,c);
+ /* we can evaluate 2 Projs of the same Cmp */
+ if(get_irn_mode(n) == mode_b && is_Proj(a) && is_Proj(b)) {
+ ir_node *pred_a = get_Proj_pred(a);
+ ir_node *pred_b = get_Proj_pred(b);
+ if(pred_a == pred_b) {
+ dbg_info *dbgi = get_irn_dbg_info(n);
+ ir_node *block = get_nodes_block(pred_a);
+ pn_Cmp pn_a = get_Proj_proj(a);
+ pn_Cmp pn_b = get_Proj_proj(b);
+ /* yes, we can simply calculate with pncs */
+ pn_Cmp new_pnc = pn_a & pn_b;
+
+ return new_rd_Proj(dbgi, current_ir_graph, block, pred_a, mode_b,
+ new_pnc);
+ }
+ }
+
n = transform_bitwise_distributive(n, transform_node_And);
return n;
HANDLE_BINOP_PHI(tarval_eor, a,b,c);
+ /* we can evaluate 2 Projs of the same Cmp */
+ if(get_irn_mode(n) == mode_b && is_Proj(a) && is_Proj(b)) {
+ ir_node *pred_a = get_Proj_pred(a);
+ ir_node *pred_b = get_Proj_pred(b);
+ if(pred_a == pred_b) {
+ dbg_info *dbgi = get_irn_dbg_info(n);
+ ir_node *block = get_nodes_block(pred_a);
+ pn_Cmp pn_a = get_Proj_proj(a);
+ pn_Cmp pn_b = get_Proj_proj(b);
+ /* yes, we can simply calculate with pncs */
+ pn_Cmp new_pnc = pn_a ^ pn_b;
+
+ return new_rd_Proj(dbgi, current_ir_graph, block, pred_a, mode_b,
+ new_pnc);
+ }
+ }
+
if (a == b) {
/* a ^ a = 0 */
n = new_rd_Const(get_irn_dbg_info(n), current_ir_graph, get_irn_n(n, -1),
static ir_node *transform_node_Minus(ir_node *n) {
ir_node *c, *oldn = n;
ir_node *a = get_Minus_op(n);
+ ir_mode *mode;
HANDLE_UNOP_PHI(tarval_neg,a,c);
- if (is_Not(a)) {
+ mode = get_irn_mode(a);
+ if (get_mode_arithmetic(mode) == irma_twos_complement && is_Not(a)) {
/* -(~x) = x + 1 */
ir_node *op = get_Not_op(a);
- ir_mode *mode = get_irn_mode(op);
tarval *tv = get_mode_one(mode);
ir_node *blk = get_irn_n(n, -1);
ir_node *c = new_r_Const(current_ir_graph, blk, mode, tv);
n = new_rd_Add(get_irn_dbg_info(n), current_ir_graph, blk, op, c, mode);
DBG_OPT_ALGSIM2(oldn, a, n, FS_OPT_MINUS_NOT);
+ } else if (is_Sub(a)) {
+ /* - (a-b) = b - a */
+ ir_node *la = get_Sub_left(a);
+ ir_node *ra = get_Sub_right(a);
+ ir_node *blk = get_irn_n(n, -1);
+
+ n = new_rd_Sub(get_irn_dbg_info(n), current_ir_graph, blk, ra, la, mode);
+ DBG_OPT_ALGSIM2(oldn, a, n, FS_OPT_MINUS_SUB);
}
return n;
* Normalizes and optimizes Cmp nodes.
*/
static ir_node *transform_node_Proj_Cmp(ir_node *proj) {
- if (get_opt_reassociation()) {
- ir_node *n = get_Proj_pred(proj);
- ir_node *left = get_Cmp_left(n);
- ir_node *right = get_Cmp_right(n);
- ir_node *c = NULL;
- tarval *tv = NULL;
- int changed = 0;
- ir_mode *mode = NULL;
- long proj_nr = get_Proj_proj(proj);
+ ir_node *n = get_Proj_pred(proj);
+ ir_node *left = get_Cmp_left(n);
+ ir_node *right = get_Cmp_right(n);
+ ir_node *c = NULL;
+ tarval *tv = NULL;
+ int changed = 0;
+ ir_mode *mode = NULL;
+ long proj_nr = get_Proj_proj(proj);
+
+ /* we can evaluate this direct */
+ switch(proj_nr) {
+ case pn_Cmp_False:
+ return new_Const(mode_b, get_tarval_b_false());
+ case pn_Cmp_True:
+ return new_Const(mode_b, get_tarval_b_true());
+ case pn_Cmp_Leg:
+ if(!mode_is_float(get_irn_mode(left)))
+ return new_Const(mode_b, get_tarval_b_true());
+ break;
+ default:
+ break;
+ }
- /*
- * First step: normalize the compare op
- * by placing the constant on the right site
- * or moving the lower address node to the left.
- * We ignore the case that both are constants
- * this case should be optimized away.
- */
- if (get_irn_op(right) == op_Const) {
- c = right;
- } else if (get_irn_op(left) == op_Const) {
- c = left;
- left = right;
- right = c;
-
- proj_nr = get_inversed_pnc(proj_nr);
- changed |= 1;
- } else if (get_irn_idx(left) > get_irn_idx(right)) {
- ir_node *t = left;
-
- left = right;
- right = t;
-
- proj_nr = get_inversed_pnc(proj_nr);
- changed |= 1;
+ /* Remove unnecessary conversions */
+ /* TODO handle constants */
+ if (is_Conv(left) && is_Conv(right)) {
+ ir_mode* mode = get_irn_mode(left);
+ ir_node* op_left = get_Conv_op(left);
+ ir_node* op_right = get_Conv_op(right);
+ ir_mode* mode_left = get_irn_mode(op_left);
+ ir_mode* mode_right = get_irn_mode(op_right);
+
+ if (smaller_mode(mode_left, mode) && smaller_mode(mode_right, mode)) {
+ ir_graph* irg = current_ir_graph;
+ ir_node* block = get_nodes_block(n);
+ ir_node* new_left;
+ ir_node* new_right;
+
+ if (mode_left == mode_right) {
+ new_left = op_left;
+ new_right = op_right;
+ } else if (smaller_mode(mode_left, mode_right)) {
+ new_left = new_r_Conv(irg, block, op_left, mode_right);
+ new_right = op_right;
+ } else if (smaller_mode(mode_right, mode_left)) {
+ new_left = op_left;
+ new_right = new_r_Conv(irg, block, op_right, mode_left);
+ } else {
+ goto no_remove_conv;
+ }
+ left = new_left;
+ right = new_right;
+ set_Cmp_left( n, left);
+ set_Cmp_right(n, right);
+no_remove_conv:;
}
+ }
- /*
- * Second step: Try to reduce the magnitude
- * of a constant. This may help to generate better code
- * later and may help to normalize more compares.
- * Of course this is only possible for integer values.
- */
- if (c) {
- mode = get_irn_mode(c);
- tv = get_Const_tarval(c);
+ if (get_irn_mode(left) == mode_b) {
+ ir_graph* irg = current_ir_graph;
+ ir_node* block = get_nodes_block(n);
- if (tv != tarval_bad) {
- /* the following optimization is possible on modes without Overflow
- * on Unary Minus or on == and !=:
- * -a CMP c ==> a swap(CMP) -c
- *
- * Beware: for two-complement Overflow may occur, so only == and != can
- * be optimized, see this:
- * -MININT < 0 =/=> MININT > 0 !!!
- */
- if (get_opt_constant_folding() && get_irn_op(left) == op_Minus &&
- (!mode_overflow_on_unary_Minus(mode) ||
- (mode_is_int(mode) && (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg)))) {
- left = get_Minus_op(left);
- tv = tarval_neg(tv);
+ switch (proj_nr) {
+ case pn_Cmp_Le: return new_r_Or( irg, block, new_r_Not(irg, block, left, mode_b), right, mode_b);
+ case pn_Cmp_Lt: return new_r_And(irg, block, new_r_Not(irg, block, left, mode_b), right, mode_b);
+ case pn_Cmp_Ge: return new_r_Or( irg, block, left, new_r_Not(irg, block, right, mode_b), mode_b);
+ case pn_Cmp_Gt: return new_r_And(irg, block, left, new_r_Not(irg, block, right, mode_b), mode_b);
+ case pn_Cmp_Lg: return new_r_Eor(irg, block, left, right, mode_b);
+ case pn_Cmp_Eq: return new_r_Not(irg, block, new_r_Eor(irg, block, left, right, mode_b), mode_b);
+ }
+ }
+
+ if (!get_opt_reassociation())
+ return proj;
+
+ /*
+ * First step: normalize the compare op
+ * by placing the constant on the right site
+ * or moving the lower address node to the left.
+ * We ignore the case that both are constants
+ * this case should be optimized away.
+ */
+ if (get_irn_op(right) == op_Const) {
+ c = right;
+ } else if (get_irn_op(left) == op_Const) {
+ c = left;
+ left = right;
+ right = c;
+
+ proj_nr = get_inversed_pnc(proj_nr);
+ changed |= 1;
+ } else if (get_irn_idx(left) > get_irn_idx(right)) {
+ ir_node *t = left;
+
+ left = right;
+ right = t;
+
+ proj_nr = get_inversed_pnc(proj_nr);
+ changed |= 1;
+ }
+
+ /*
+ * Second step: Try to reduce the magnitude
+ * of a constant. This may help to generate better code
+ * later and may help to normalize more compares.
+ * Of course this is only possible for integer values.
+ */
+ if (c) {
+ mode = get_irn_mode(c);
+ tv = get_Const_tarval(c);
+
+ if (tv != tarval_bad) {
+ /* the following optimization is possible on modes without Overflow
+ * on Unary Minus or on == and !=:
+ * -a CMP c ==> a swap(CMP) -c
+ *
+ * Beware: for two-complement Overflow may occur, so only == and != can
+ * be optimized, see this:
+ * -MININT < 0 =/=> MININT > 0 !!!
+ */
+ if (get_opt_constant_folding() && get_irn_op(left) == op_Minus &&
+ (!mode_overflow_on_unary_Minus(mode) ||
+ (mode_is_int(mode) && (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg)))) {
+ left = get_Minus_op(left);
+ tv = tarval_neg(tv);
+
+ if (tv != tarval_bad) {
+ proj_nr = get_inversed_pnc(proj_nr);
+ changed |= 2;
+ }
+ }
+
+ /* for integer modes, we have more */
+ if (mode_is_int(mode)) {
+ /* Ne includes Unordered which is not possible on integers.
+ * However, frontends often use this wrong, so fix it here */
+ if (proj_nr & pn_Cmp_Uo) {
+ proj_nr &= ~pn_Cmp_Uo;
+ set_Proj_proj(proj, proj_nr);
+ }
+
+ /* c > 0 : a < c ==> a <= (c-1) a >= c ==> a > (c-1) */
+ if ((proj_nr == pn_Cmp_Lt || proj_nr == pn_Cmp_Ge) &&
+ tarval_cmp(tv, get_mode_null(mode)) == pn_Cmp_Gt) {
+ tv = tarval_sub(tv, get_mode_one(mode));
if (tv != tarval_bad) {
- proj_nr = get_inversed_pnc(proj_nr);
+ proj_nr ^= pn_Cmp_Eq;
changed |= 2;
}
}
+ /* c < 0 : a > c ==> a >= (c+1) a <= c ==> a < (c+1) */
+ else if ((proj_nr == pn_Cmp_Gt || proj_nr == pn_Cmp_Le) &&
+ tarval_cmp(tv, get_mode_null(mode)) == pn_Cmp_Lt) {
+ tv = tarval_add(tv, get_mode_one(mode));
- /* for integer modes, we have more */
- if (mode_is_int(mode)) {
- /* Ne includes Unordered which is not possible on integers.
- * However, frontends often use this wrong, so fix it here */
- if (proj_nr & pn_Cmp_Uo) {
- proj_nr &= ~pn_Cmp_Uo;
- set_Proj_proj(proj, proj_nr);
+ if (tv != tarval_bad) {
+ proj_nr ^= pn_Cmp_Eq;
+ changed |= 2;
}
+ }
- /* c > 0 : a < c ==> a <= (c-1) a >= c ==> a > (c-1) */
- if ((proj_nr == pn_Cmp_Lt || proj_nr == pn_Cmp_Ge) &&
- tarval_cmp(tv, get_mode_null(mode)) == pn_Cmp_Gt) {
- tv = tarval_sub(tv, get_mode_one(mode));
+ /* the following reassociations work only for == and != */
+ if (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) {
- if (tv != tarval_bad) {
- proj_nr ^= pn_Cmp_Eq;
- changed |= 2;
- }
- }
- /* c < 0 : a > c ==> a >= (c+1) a <= c ==> a < (c+1) */
- else if ((proj_nr == pn_Cmp_Gt || proj_nr == pn_Cmp_Le) &&
- tarval_cmp(tv, get_mode_null(mode)) == pn_Cmp_Lt) {
- tv = tarval_add(tv, get_mode_one(mode));
+ /* a-b == 0 ==> a == b, a-b != 0 ==> a != b */
+ if (classify_tarval(tv) == TV_CLASSIFY_NULL && get_irn_op(left) == op_Sub) {
+ right = get_Sub_right(left);
+ left = get_Sub_left(left);
+ tv = value_of(right);
if (tv != tarval_bad) {
- proj_nr ^= pn_Cmp_Eq;
- changed |= 2;
+ changed = 1;
}
}
- /* the following reassociations work only for == and != */
- if (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) {
-
- /* a-b == 0 ==> a == b, a-b != 0 ==> a != b */
- if (classify_tarval(tv) == TV_CLASSIFY_NULL && get_irn_op(left) == op_Sub) {
- right = get_Sub_right(left);
- left = get_Sub_left(left);
-
- tv = value_of(right);
- if (tv != tarval_bad) {
- changed = 1;
- }
- }
+ if (tv != tarval_bad) {
+ ir_op *op = get_irn_op(left);
- if (tv != tarval_bad) {
- ir_op *op = get_irn_op(left);
+ /* a-c1 == c2 ==> a == c2+c1, a-c1 != c2 ==> a != c2+c1 */
+ if (op == op_Sub) {
+ ir_node *c1 = get_Sub_right(left);
+ tarval *tv2 = value_of(c1);
- /* a-c1 == c2 ==> a == c2+c1, a-c1 != c2 ==> a != c2+c1 */
- if (op == op_Sub) {
- ir_node *c1 = get_Sub_right(left);
- tarval *tv2 = value_of(c1);
+ if (tv2 != tarval_bad) {
+ tv2 = tarval_add(tv, value_of(c1));
if (tv2 != tarval_bad) {
- tv2 = tarval_add(tv, value_of(c1));
-
- if (tv2 != tarval_bad) {
- left = get_Sub_left(left);
- tv = tv2;
- changed |= 2;
- }
+ left = get_Sub_left(left);
+ tv = tv2;
+ changed |= 2;
}
}
- /* a+c1 == c2 ==> a == c2-c1, a+c1 != c2 ==> a != c2-c1 */
- else if (op == op_Add) {
- ir_node *a_l = get_Add_left(left);
- ir_node *a_r = get_Add_right(left);
- ir_node *a;
- tarval *tv2;
-
- if (get_irn_op(a_l) == op_Const) {
- a = a_r;
- tv2 = value_of(a_l);
- } else {
- a = a_l;
- tv2 = value_of(a_r);
- }
-
- if (tv2 != tarval_bad) {
- tv2 = tarval_sub(tv, tv2);
-
- if (tv2 != tarval_bad) {
- left = a;
- tv = tv2;
- changed |= 2;
- }
- }
+ }
+ /* a+c1 == c2 ==> a == c2-c1, a+c1 != c2 ==> a != c2-c1 */
+ else if (op == op_Add) {
+ ir_node *a_l = get_Add_left(left);
+ ir_node *a_r = get_Add_right(left);
+ ir_node *a;
+ tarval *tv2;
+
+ if (get_irn_op(a_l) == op_Const) {
+ a = a_r;
+ tv2 = value_of(a_l);
+ } else {
+ a = a_l;
+ tv2 = value_of(a_r);
}
- /* -a == c ==> a == -c, -a != c ==> a != -c */
- else if (op == op_Minus) {
- tarval *tv2 = tarval_sub(get_mode_null(mode), tv);
+
+ if (tv2 != tarval_bad) {
+ tv2 = tarval_sub(tv, tv2);
if (tv2 != tarval_bad) {
- left = get_Minus_op(left);
+ left = a;
tv = tv2;
changed |= 2;
}
}
}
- } /* == or != */
- /* the following reassociations work only for <= */
- else if (proj_nr == pn_Cmp_Le || proj_nr == pn_Cmp_Lt) {
- if (tv != tarval_bad) {
- ir_op *op = get_irn_op(left);
+ /* -a == c ==> a == -c, -a != c ==> a != -c */
+ else if (op == op_Minus) {
+ tarval *tv2 = tarval_sub(get_mode_null(mode), tv);
- /* c >= 0 : Abs(a) <= c ==> (unsigned)(a + c) <= 2*c */
- if (op == op_Abs) {
+ if (tv2 != tarval_bad) {
+ left = get_Minus_op(left);
+ tv = tv2;
+ changed |= 2;
}
}
}
- } /* mode_is_int */
+ } /* == or != */
+ /* the following reassociations work only for <= */
+ else if (proj_nr == pn_Cmp_Le || proj_nr == pn_Cmp_Lt) {
+ if (tv != tarval_bad) {
+ ir_op *op = get_irn_op(left);
- /*
- * optimization for AND:
- * Optimize:
- * And(x, C) == C ==> And(x, C) != 0
- * And(x, C) != C ==> And(X, C) == 0
- *
- * if C is a single Bit constant.
- */
- if ((proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) &&
- (get_irn_op(left) == op_And)) {
- if (is_single_bit_tarval(tv)) {
- /* check for Constant's match. We have check hare the tarvals,
- because our const might be changed */
- ir_node *la = get_And_left(left);
- ir_node *ra = get_And_right(left);
- if ((is_Const(la) && get_Const_tarval(la) == tv) ||
- (is_Const(ra) && get_Const_tarval(ra) == tv)) {
- /* fine: do the transformation */
- tv = get_mode_null(get_tarval_mode(tv));
- proj_nr ^= pn_Cmp_Leg;
- changed |= 2;
+ /* c >= 0 : Abs(a) <= c ==> (unsigned)(a + c) <= 2*c */
+ if (op == op_Abs) {
}
}
}
- } /* tarval != bad */
- }
+ } /* mode_is_int */
+
+ /*
+ * optimization for AND:
+ * Optimize:
+ * And(x, C) == C ==> And(x, C) != 0
+ * And(x, C) != C ==> And(X, C) == 0
+ *
+ * if C is a single Bit constant.
+ */
+ if ((proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) &&
+ (get_irn_op(left) == op_And)) {
+ if (tarval_is_single_bit(tv)) {
+ /* check for Constant's match. We have check hare the tarvals,
+ because our const might be changed */
+ ir_node *la = get_And_left(left);
+ ir_node *ra = get_And_right(left);
+ if ((is_Const(la) && get_Const_tarval(la) == tv) ||
+ (is_Const(ra) && get_Const_tarval(ra) == tv)) {
+ /* fine: do the transformation */
+ tv = get_mode_null(get_tarval_mode(tv));
+ proj_nr ^= pn_Cmp_Leg;
+ changed |= 2;
+ }
+ }
+ }
+ } /* tarval != bad */
+ }
- if (changed) {
- ir_node *block = get_irn_n(n, -1); /* Beware of get_nodes_Block() */
+ if (changed) {
+ ir_node *block = get_irn_n(n, -1); /* Beware of get_nodes_Block() */
- if (changed & 2) /* need a new Const */
- right = new_Const(mode, tv);
+ if (changed & 2) /* need a new Const */
+ right = new_Const(mode, tv);
- /* create a new compare */
- n = new_rd_Cmp(get_irn_dbg_info(n), current_ir_graph, block,
- left, right);
+ /* create a new compare */
+ n = new_rd_Cmp(get_irn_dbg_info(n), current_ir_graph, block,
+ left, right);
- set_Proj_pred(proj, n);
- set_Proj_proj(proj, proj_nr);
- }
+ set_Proj_pred(proj, n);
+ set_Proj_proj(proj, proj_nr);
}
+
return proj;
} /* transform_node_Proj_Cmp */
* OR c2 ===> OR
* AND c1
* OR
+ *
+ *
+ * value c2 value c1
+ * AND c1 ===> OR if (c1 | c2) == 0x111..11
+ * OR
*/
static ir_node *transform_node_Or_bf_store(ir_node *or) {
ir_node *and, *c1;
tarval *tv1, *tv2, *tv3, *tv4, *tv, *n_tv4, *n_tv2;
- get_comm_Binop_Ops(or, &and, &c1);
- if ((get_irn_op(c1) != op_Const) || (get_irn_op(and) != op_And))
- return or;
+ while (1) {
+ get_comm_Binop_Ops(or, &and, &c1);
+ if (!is_Const(c1) || !is_And(and))
+ return or;
- get_comm_Binop_Ops(and, &or_l, &c2);
- if ((get_irn_op(c2) != op_Const) || (get_irn_op(or_l) != op_Or))
- return or;
+ get_comm_Binop_Ops(and, &or_l, &c2);
+ if (!is_Const(c2))
+ return or;
- get_comm_Binop_Ops(or_l, &and_l, &c3);
- if ((get_irn_op(c3) != op_Const) || (get_irn_op(and_l) != op_And))
- return or;
+ tv1 = get_Const_tarval(c1);
+ tv2 = get_Const_tarval(c2);
- get_comm_Binop_Ops(and_l, &value, &c4);
- if (get_irn_op(c4) != op_Const)
- return or;
+ tv = tarval_or(tv1, tv2);
+ if (classify_tarval(tv) == TV_CLASSIFY_ALL_ONE) {
+ /* the AND does NOT clear a bit with isn't set be the OR */
+ set_Or_left(or, or_l);
+ set_Or_right(or, c1);
- /* ok, found the pattern, check for conditions */
- assert(mode == get_irn_mode(and));
- assert(mode == get_irn_mode(or_l));
- assert(mode == get_irn_mode(and_l));
+ /* check for more */
+ continue;
+ }
- tv1 = get_Const_tarval(c1);
- tv2 = get_Const_tarval(c2);
- tv3 = get_Const_tarval(c3);
- tv4 = get_Const_tarval(c4);
+ if (!is_Or(or_l))
+ return or;
- tv = tarval_or(tv4, tv2);
- if (classify_tarval(tv) != TV_CLASSIFY_ALL_ONE) {
- /* have at least one 0 at the same bit position */
- return or;
- }
+ get_comm_Binop_Ops(or_l, &and_l, &c3);
+ if (!is_Const(c3) || !is_And(and_l))
+ return or;
- n_tv4 = tarval_not(tv4);
- if (tv3 != tarval_and(tv3, n_tv4)) {
- /* bit in the or_mask is outside the and_mask */
- return or;
- }
+ get_comm_Binop_Ops(and_l, &value, &c4);
+ if (!is_Const(c4))
+ return or;
- n_tv2 = tarval_not(tv2);
- if (tv1 != tarval_and(tv1, n_tv2)) {
- /* bit in the or_mask is outside the and_mask */
- return or;
- }
+ /* ok, found the pattern, check for conditions */
+ assert(mode == get_irn_mode(and));
+ assert(mode == get_irn_mode(or_l));
+ assert(mode == get_irn_mode(and_l));
+
+ tv3 = get_Const_tarval(c3);
+ tv4 = get_Const_tarval(c4);
+
+ tv = tarval_or(tv4, tv2);
+ if (classify_tarval(tv) != TV_CLASSIFY_ALL_ONE) {
+ /* have at least one 0 at the same bit position */
+ return or;
+ }
+
+ n_tv4 = tarval_not(tv4);
+ if (tv3 != tarval_and(tv3, n_tv4)) {
+ /* bit in the or_mask is outside the and_mask */
+ return or;
+ }
- /* ok, all conditions met */
- block = get_irn_n(or, -1);
+ n_tv2 = tarval_not(tv2);
+ if (tv1 != tarval_and(tv1, n_tv2)) {
+ /* bit in the or_mask is outside the and_mask */
+ return or;
+ }
+
+ /* ok, all conditions met */
+ block = get_irn_n(or, -1);
- new_and = new_r_And(current_ir_graph, block,
- value, new_r_Const(current_ir_graph, block, mode, tarval_and(tv4, tv2)), mode);
+ new_and = new_r_And(current_ir_graph, block,
+ value, new_r_Const(current_ir_graph, block, mode, tarval_and(tv4, tv2)), mode);
- new_const = new_r_Const(current_ir_graph, block, mode, tarval_or(tv3, tv1));
+ new_const = new_r_Const(current_ir_graph, block, mode, tarval_or(tv3, tv1));
- set_Or_left(or, new_and);
- set_Or_right(or, new_const);
+ set_Or_left(or, new_and);
+ set_Or_right(or, new_const);
- /* check for more */
- return transform_node_Or_bf_store(or);
+ /* check for more */
+ }
} /* transform_node_Or_bf_store */
/**
ir_node *a = get_Or_left(n);
ir_node *b = get_Or_right(n);
+ /* we can evaluate 2 Projs of the same Cmp */
+ if(get_irn_mode(n) == mode_b && is_Proj(a) && is_Proj(b)) {
+ ir_node *pred_a = get_Proj_pred(a);
+ ir_node *pred_b = get_Proj_pred(b);
+ if(pred_a == pred_b) {
+ dbg_info *dbgi = get_irn_dbg_info(n);
+ ir_node *block = get_nodes_block(pred_a);
+ pn_Cmp pn_a = get_Proj_proj(a);
+ pn_Cmp pn_b = get_Proj_proj(b);
+ /* yes, we can simply calculate with pncs */
+ pn_Cmp new_pnc = pn_a | pn_b;
+
+ return new_rd_Proj(dbgi, current_ir_graph, block, pred_a, mode_b,
+ new_pnc);
+ }
+ }
+
HANDLE_BINOP_PHI(tarval_or, a,b,c);
n = transform_node_Or_bf_store(n);
return n;
} /* transform_node_End */
+/** returns 1 if a == -b */
+static int is_negated_value(ir_node *a, ir_node *b) {
+ if(is_Minus(a) && get_Minus_op(a) == b)
+ return 1;
+ if(is_Minus(b) && get_Minus_op(b) == a)
+ return 1;
+ if(is_Sub(a) && is_Sub(b)) {
+ ir_node *a_left = get_Sub_left(a);
+ ir_node *a_right = get_Sub_right(a);
+ ir_node *b_left = get_Sub_left(b);
+ ir_node *b_right = get_Sub_right(b);
+
+ if(a_left == b_right && a_right == b_left)
+ return 1;
+ }
+
+ return 0;
+}
+
/**
* Optimize a Mux into some simpler cases.
*/
ir_node *oldn = n, *sel = get_Mux_sel(n);
ir_mode *mode = get_irn_mode(n);
+ 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_graph *irg = current_ir_graph;
+
+ if (is_Const(t)) {
+ tarval *tv_t = get_Const_tarval(t);
+ if (tv_t == tarval_b_true) {
+ if (is_Const(f)) {
+ assert(get_Const_tarval(f) == tarval_b_false);
+ return sel;
+ } else {
+ return new_rd_Or(dbg, irg, block, sel, f, mode_b);
+ }
+ } else {
+ ir_node* not_sel = new_rd_Not(dbg, irg, block, sel, mode_b);
+ assert(tv_t == tarval_b_false);
+ if (is_Const(f)) {
+ assert(get_Const_tarval(f) == tarval_b_true);
+ return not_sel;
+ } else {
+ return new_rd_And(dbg, irg, block, not_sel, f, mode_b);
+ }
+ }
+ } else if (is_Const(f)) {
+ tarval *tv_f = get_Const_tarval(f);
+ if (tv_f == tarval_b_true) {
+ ir_node* not_sel = new_rd_Not(dbg, irg, block, sel, mode_b);
+ return new_rd_Or(dbg, irg, block, not_sel, t, mode_b);
+ } else {
+ assert(tv_f == tarval_b_false);
+ return new_rd_And(dbg, irg, block, sel, t, mode_b);
+ }
+ }
+ }
+
if (get_irn_op(sel) == op_Proj && !mode_honor_signed_zeros(mode)) {
ir_node *cmp = get_Proj_pred(sel);
- long proj_nr = get_Proj_proj(sel);
- ir_node *f = get_Mux_false(n);
+ long pn = get_Proj_proj(sel);
+ ir_node *f = get_Mux_false(n);
ir_node *t = get_Mux_true(n);
- if (get_irn_op(cmp) == op_Cmp && classify_Const(get_Cmp_right(cmp)) == CNST_NULL) {
- ir_node *block = get_irn_n(n, -1);
-
- /*
- * Note: normalization puts the constant on the right site,
- * so we check only one case.
- *
- * Note further that these optimization work even for floating point
- * with NaN's because -NaN == NaN.
- * However, if +0 and -0 is handled differently, we cannot use the first one.
- */
- if (get_irn_op(f) == op_Minus &&
- get_Minus_op(f) == t &&
- get_Cmp_left(cmp) == t) {
-
- if (proj_nr == pn_Cmp_Ge || proj_nr == pn_Cmp_Gt) {
- /* Mux(a >=/> 0, -a, a) ==> Abs(a) */
- n = new_rd_Abs(get_irn_dbg_info(n),
- current_ir_graph,
- block,
- t, mode);
- DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_ABS);
- return n;
- } else if (proj_nr == pn_Cmp_Le || proj_nr == pn_Cmp_Lt) {
- /* Mux(a <=/< 0, -a, a) ==> Minus(Abs(a)) */
- n = new_rd_Abs(get_irn_dbg_info(n),
- current_ir_graph,
- block,
- t, mode);
- n = new_rd_Minus(get_irn_dbg_info(n),
- current_ir_graph,
- block,
- n, mode);
-
- DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_ABS);
- return n;
- }
- } else if (get_irn_op(t) == op_Minus &&
- get_Minus_op(t) == f &&
- get_Cmp_left(cmp) == f) {
-
- if (proj_nr == pn_Cmp_Le || proj_nr == pn_Cmp_Lt) {
- /* Mux(a <=/< 0, a, -a) ==> Abs(a) */
- n = new_rd_Abs(get_irn_dbg_info(n),
- current_ir_graph,
- block,
- f, mode);
+ /*
+ * Note: normalization puts the constant on the right site,
+ * so we check only one case.
+ *
+ * Note further that these optimization work even for floating point
+ * with NaN's because -NaN == NaN.
+ * However, if +0 and -0 is handled differently, we cannot use the first
+ * one.
+ */
+ if (get_irn_op(cmp) == op_Cmp
+ && classify_Const(get_Cmp_right(cmp)) == CNST_NULL) {
+ ir_node *block = get_irn_n(n, -1);
+
+ if(is_negated_value(f, t)) {
+ ir_node *cmp_left = get_Cmp_left(cmp);
+
+ /* Psi(a >= 0, a, -a) = Psi(a <= 0, -a, a) ==> Abs(a) */
+ if ( (cmp_left == t && (pn == pn_Cmp_Ge || pn == pn_Cmp_Gt))
+ || (cmp_left == f && (pn == pn_Cmp_Le || pn == pn_Cmp_Lt)))
+ {
+ n = new_rd_Abs(get_irn_dbg_info(n), current_ir_graph, block,
+ cmp_left, mode);
DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_ABS);
return n;
- } else if (proj_nr == pn_Cmp_Ge || proj_nr == pn_Cmp_Gt) {
- /* Mux(a >=/> 0, a, -a) ==> Minus(Abs(a)) */
- n = new_rd_Abs(get_irn_dbg_info(n),
- current_ir_graph,
- block,
- f, mode);
- n = new_rd_Minus(get_irn_dbg_info(n),
- current_ir_graph,
- block,
- n, mode);
-
+ /* Psi(a <= 0, a, -a) = Psi(a >= 0, -a, a) ==> -Abs(a) */
+ } else if ((cmp_left == t && (pn == pn_Cmp_Le || pn == pn_Cmp_Lt))
+ || (cmp_left == f && (pn == pn_Cmp_Ge || pn == pn_Cmp_Gt)))
+ {
+ n = new_rd_Abs(get_irn_dbg_info(n), current_ir_graph, block,
+ cmp_left, mode);
+ n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph,
+ block, n, mode);
DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_ABS);
return n;
}
* work if mode(x) = Hs and mode == Is, but at least it removes
* all wrong cases.
*/
- if ((proj_nr == pn_Cmp_Lt || proj_nr == pn_Cmp_Le) &&
+ if ((pn == pn_Cmp_Lt || pn == pn_Cmp_Le) &&
classify_Const(t) == CNST_ALL_ONE &&
classify_Const(f) == CNST_NULL) {
/*
mode);
DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_SHR);
return n;
- } else if ((proj_nr == pn_Cmp_Gt || proj_nr == pn_Cmp_Ge) &&
+ } else if ((pn == pn_Cmp_Gt || pn == pn_Cmp_Ge) &&
classify_Const(t) == CNST_ONE &&
classify_Const(f) == CNST_NULL) {
/*
* not be freed even if the equivalent node isn't the old one.
*/
static ir_node *transform_node(ir_node *n) {
- if (n->op->ops.transform_node)
- n = n->op->ops.transform_node(n);
+ ir_node *oldn;
+
+ /*
+ * Transform_node is the only "optimizing transformation" that might
+ * return a node with a different opcode. We iterate HERE until fixpoint
+ * to get the final result.
+ */
+ do {
+ oldn = n;
+ if (n->op->ops.transform_node)
+ n = n->op->ops.transform_node(n);
+ } while (oldn != n);
+
return n;
} /* transform_node */
CASE(Div);
CASE(Mod);
CASE(DivMod);
+ CASE(Quot);
CASE(Abs);
CASE(Cond);
CASE(And);
get_Load_volatility(b) == volatility_is_volatile)
/* NEVER do CSE on volatile Loads */
return 1;
+ /* do not CSE Loads with different alignment. Be conservative. */
+ if (get_Load_align(a) != get_Load_align(b))
+ return 1;
return get_Load_mode(a) != get_Load_mode(b);
} /* node_cmp_attr_Load */
/** Compares the attributes of two Store nodes. */
static int node_cmp_attr_Store(ir_node *a, ir_node *b) {
+ /* do not CSE Stores with different alignment. Be conservative. */
+ if (get_Store_align(a) != get_Store_align(b))
+ return 1;
+
/* NEVER do CSE on volatile Stores */
return (get_Store_volatility(a) == volatility_is_volatile ||
get_Store_volatility(b) == volatility_is_volatile);
if (get_opt_constant_folding()) {
/* neither constants nor Tuple values can be evaluated */
if (iro != iro_Const && (get_irn_mode(n) != mode_T)) {
+ unsigned fp_model = get_irg_fp_model(current_ir_graph);
+ int old_fp_mode = tarval_enable_fp_ops((fp_model & fp_strict_algebraic) == 0);
/* try to evaluate */
tv = computed_value(n);
if (tv != tarval_bad) {
if (old_tp && get_type_mode(old_tp) == get_tarval_mode (tv))
set_Const_type(nw, old_tp);
DBG_OPT_CSTEVAL(oldn, nw);
+ tarval_enable_fp_ops(old_fp_mode);
return nw;
}
+ tarval_enable_fp_ops(old_fp_mode);
}
}
if (get_opt_constant_folding()) {
/* neither constants nor Tuple values can be evaluated */
if (iro != iro_Const && get_irn_mode(n) != mode_T) {
+ unsigned fp_model = get_irg_fp_model(current_ir_graph);
+ int old_fp_mode = tarval_enable_fp_ops((fp_model & fp_strict_algebraic) == 0);
/* try to evaluate */
tv = computed_value(n);
if (tv != tarval_bad) {
set_Const_type(n, old_tp);
DBG_OPT_CSTEVAL(oldn, n);
+ tarval_enable_fp_ops(old_fp_mode);
return n;
}
+ tarval_enable_fp_ops(old_fp_mode);
}
}