return tarval_bad;
} /* computed_value_Not */
+/**
+ * Tests wether a shift shifts more bits than available in the mode
+ */
+static bool is_oversize_shift(const ir_node *n)
+{
+ ir_node *count = get_binop_right(n);
+ ir_mode *mode = get_irn_mode(n);
+ ir_tarval *tv = value_of(count);
+ long modulo_shift;
+ long shiftval;
+ if (tv == tarval_bad)
+ return false;
+ if (!tarval_is_long(tv))
+ return false;
+ shiftval = get_tarval_long(tv);
+ modulo_shift = get_mode_modulo_shift(mode);
+ if (shiftval < 0 || (modulo_shift > 0 && shiftval >= modulo_shift))
+ return false;
+
+ return shiftval >= (long)get_mode_size_bits(mode);
+}
+
/**
* Return the value of a Shl.
*/
if ((ta != tarval_bad) && (tb != tarval_bad)) {
return tarval_shl(ta, tb);
}
+
+ if (is_oversize_shift(n))
+ return get_mode_null(get_irn_mode(n));
+
return tarval_bad;
} /* computed_value_Shl */
if ((ta != tarval_bad) && (tb != tarval_bad)) {
return tarval_shr(ta, tb);
}
+ if (is_oversize_shift(n))
+ return get_mode_null(get_irn_mode(n));
+
return tarval_bad;
} /* computed_value_Shr */
return tarval_bad;
} /* computed_value_Rotl */
+bool ir_zero_when_converted(const ir_node *node, ir_mode *dest_mode)
+{
+ ir_mode *mode = get_irn_mode(node);
+ if (get_mode_arithmetic(mode) != irma_twos_complement
+ || get_mode_arithmetic(dest_mode) != irma_twos_complement)
+ return false;
+
+ if (is_Shl(node)) {
+ ir_node *count = get_Shl_right(node);
+ if (is_Const(count)) {
+ ir_tarval *tv = get_Const_tarval(count);
+ if (tarval_is_long(tv)) {
+ long shiftval = get_tarval_long(tv);
+ long destbits = get_mode_size_bits(dest_mode);
+ if (shiftval >= destbits
+ && shiftval < (long)get_mode_modulo_shift(mode))
+ return true;
+ }
+ }
+ }
+ if (is_And(node)) {
+ ir_node *right = get_And_right(node);
+ if (is_Const(right)) {
+ ir_tarval *tv = get_Const_tarval(right);
+ ir_tarval *conved = tarval_convert_to(tv, dest_mode);
+ return tarval_is_null(conved);
+ }
+ }
+ return false;
+}
+
/**
* Return the value of a Conv.
*/
static ir_tarval *computed_value_Conv(const ir_node *n)
{
- ir_node *a = get_Conv_op(n);
- ir_tarval *ta = value_of(a);
+ ir_node *a = get_Conv_op(n);
+ ir_tarval *ta = value_of(a);
+ ir_mode *mode = get_irn_mode(n);
if (ta != tarval_bad)
return tarval_convert_to(ta, get_irn_mode(n));
+ if (ir_zero_when_converted(a, mode))
+ return get_mode_null(mode);
+
return tarval_bad;
} /* computed_value_Conv */
#undef CASE
} /* firm_set_default_computed_value */
-/**
- * Returns a equivalent block for another block.
- * If the block has only one predecessor, this is
- * the equivalent one. If the only predecessor of a block is
- * the block itself, this is a dead block.
- *
- * If both predecessors of a block are the branches of a binary
- * Cond, the equivalent block is Cond's block.
- *
- * If all predecessors of a block are bad or lies in a dead
- * block, the current block is dead as well.
- *
- * Note, that blocks are NEVER turned into Bad's, instead
- * the dead_block flag is set. So, never test for is_Bad(block),
- * always use is_dead_Block(block).
- */
-static ir_node *equivalent_node_Block(ir_node *n)
-{
- ir_node *oldn = n;
- int n_preds;
- ir_graph *irg;
-
- /* don't optimize dead or labeled blocks */
- if (is_Block_dead(n) || has_Block_entity(n))
- return n;
-
- n_preds = get_Block_n_cfgpreds(n);
-
- /* The Block constructor does not call optimize, but mature_immBlock()
- calls the optimization. */
- assert(get_Block_matured(n));
-
- irg = get_irn_irg(n);
-
- /* Straightening: a single entry Block following a single exit Block
- can be merged, if it is not the Start block. */
- /* !!! Beware, all Phi-nodes of n must have been optimized away.
- This should be true, as the block is matured before optimize is called.
- But what about Phi-cycles with the Phi0/Id that could not be resolved?
- Remaining Phi nodes are just Ids. */
- if (n_preds == 1) {
- ir_node *pred = skip_Proj(get_Block_cfgpred(n, 0));
-
- if (is_Jmp(pred)) {
- ir_node *predblock = get_nodes_block(pred);
- if (predblock == oldn) {
- /* Jmp jumps into the block it is in -- deal self cycle. */
- n = set_Block_dead(n);
- DBG_OPT_DEAD_BLOCK(oldn, n);
- } else {
- n = predblock;
- DBG_OPT_STG(oldn, n);
- }
- } else if (is_Cond(pred)) {
- ir_node *predblock = get_nodes_block(pred);
- if (predblock == oldn) {
- /* Jmp jumps into the block it is in -- deal self cycle. */
- n = set_Block_dead(n);
- DBG_OPT_DEAD_BLOCK(oldn, n);
- }
- }
- } else if (n_preds == 2) {
- /* Test whether Cond jumps twice to this block
- * The more general case which more than 2 predecessors is handles
- * in optimize_cf(), we handle only this special case for speed here.
- */
- ir_node *a = get_Block_cfgpred(n, 0);
- ir_node *b = get_Block_cfgpred(n, 1);
-
- if (is_Proj(a) && is_Proj(b)) {
- ir_node *cond = get_Proj_pred(a);
-
- if (cond == get_Proj_pred(b) && is_Cond(cond) &&
- get_irn_mode(get_Cond_selector(cond)) == mode_b) {
- /* Also a single entry Block following a single exit Block. Phis have
- twice the same operand and will be optimized away. */
- n = get_nodes_block(cond);
- DBG_OPT_IFSIM1(oldn, a, b, n);
- }
- }
- } else if (get_opt_unreachable_code() &&
- (n != get_irg_start_block(irg)) &&
- (n != get_irg_end_block(irg))) {
- int i;
-
- /* If all inputs are dead, this block is dead too, except if it is
- the start or end block. This is one step of unreachable code
- elimination */
- for (i = get_Block_n_cfgpreds(n) - 1; i >= 0; --i) {
- ir_node *pred = get_Block_cfgpred(n, i);
- ir_node *pred_blk;
-
- if (is_Bad(pred)) continue;
- pred_blk = get_nodes_block(skip_Proj(pred));
-
- if (is_Block_dead(pred_blk)) continue;
-
- if (pred_blk != n) {
- /* really found a living input */
- break;
- }
- }
- if (i < 0) {
- n = set_Block_dead(n);
- DBG_OPT_DEAD_BLOCK(oldn, n);
- }
- }
-
- return n;
-} /* equivalent_node_Block */
-
-/**
- * Returns a equivalent node for a Jmp, a Bad :-)
- * Of course this only happens if the Block of the Jmp is dead.
- */
-static ir_node *equivalent_node_Jmp(ir_node *n)
-{
- ir_node *oldn = n;
-
- /* unreachable code elimination */
- if (is_Block_dead(get_nodes_block(n))) {
- ir_graph *irg = get_irn_irg(n);
- n = get_irg_bad(irg);
- DBG_OPT_DEAD_BLOCK(oldn, n);
- }
- return n;
-} /* equivalent_node_Jmp */
-
-/** Raise is handled in the same way as Jmp. */
-#define equivalent_node_Raise equivalent_node_Jmp
-
-
-/* We do not evaluate Cond here as we replace it by a new node, a Jmp.
- See transform_node_Proj_Cond(). */
-
/**
* Optimize operations that are commutative and have neutral 0,
* so a op 0 = 0 op a = a.
n_preds = get_Phi_n_preds(n);
block = get_nodes_block(n);
- /* Control dead */
- if (is_Block_dead(block)) {
- ir_graph *irg = get_irn_irg(n);
- return get_irg_bad(irg);
- }
- if (n_preds == 0) return n; /* Phi of dead Region without predecessors. */
+ /* Phi of dead Region without predecessors. */
+ if (n_preds == 0)
+ return n;
/* Find first non-self-referencing input */
for (i = 0; i < n_preds; ++i) {
first_val = get_Phi_pred(n, i);
- if ( (first_val != n) /* not self pointer */
-#if 0
- /* BEWARE: when the if is changed to 1, Phis will ignore their Bad
- * predecessors. Then, Phi nodes in unreachable code might be removed,
- * causing nodes pointing to themselev (Adds for instance).
- * This is really bad and causes endless recursion on several
- * code pathes, so we do NOT optimize such code.
- * This is not that bad as it sounds, optimize_cf() removes bad control flow
- * (and bad Phi predecessors), so live code is optimized later.
- */
- && (! is_Bad(get_Block_cfgpred(block, i)))
-#endif
- ) { /* value not dead */
- break; /* then found first value. */
+ /* not self pointer */
+ if (first_val != n) {
+ /* then found first value. */
+ break;
}
}
- if (i >= n_preds) {
- ir_graph *irg = get_irn_irg(n);
- /* A totally Bad or self-referencing Phi (we didn't break the above loop) */
- return get_irg_bad(irg);
- }
-
/* search for rest of inputs, determine if any of these
are non-self-referencing */
while (++i < n_preds) {
ir_node *scnd_val = get_Phi_pred(n, i);
- if ( (scnd_val != n)
- && (scnd_val != first_val)
-#if 0
- /* see above */
- && (! is_Bad(get_Block_cfgpred(block, i)))
-#endif
- ) {
+ if (scnd_val != n && scnd_val != first_val) {
break;
}
}
return n;
} /* equivalent_node_Phi */
-/**
- * Several optimizations:
- * - fold Sync-nodes, iff they have only one predecessor except
- * themselves.
- */
-static ir_node *equivalent_node_Sync(ir_node *n)
-{
- int arity = get_Sync_n_preds(n);
- int i;
-
- for (i = 0; i < arity;) {
- ir_node *pred = get_Sync_pred(n, i);
- int j;
-
- /* Remove Bad predecessors */
- if (is_Bad(pred)) {
- del_Sync_n(n, i);
- --arity;
- continue;
- }
-
- /* Remove duplicate predecessors */
- for (j = 0;; ++j) {
- if (j >= i) {
- ++i;
- break;
- }
- if (get_Sync_pred(n, j) == pred) {
- del_Sync_n(n, i);
- --arity;
- break;
- }
- }
- }
-
- if (arity == 0) {
- ir_graph *irg = get_irn_irg(n);
- return get_irg_bad(irg);
- }
- if (arity == 1) return get_Sync_pred(n, 0);
- return n;
-} /* equivalent_node_Sync */
-
/**
* Optimize Proj(Tuple).
*/
proj = get_CopyB_mem(copyb);
DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NOP);
break;
-
- case pn_CopyB_X_except: {
- ir_graph *irg = get_irn_irg(proj);
- DBG_OPT_EXC_REM(proj);
- proj = get_irg_bad(irg);
- break;
- }
}
}
return proj;
DBG_OPT_EXC_REM(proj);
proj = get_Bound_mem(bound);
break;
- case pn_Bound_X_except: {
- ir_graph *irg = get_irn_irg(proj);
- DBG_OPT_EXC_REM(proj);
- proj = get_irg_bad(irg);
- break;
- }
case pn_Bound_res:
proj = idx;
DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NOP);
return proj;
} /* equivalent_node_Proj_Bound */
-/**
- * Optimize an Exception Proj(Load) with a non-null address.
- */
-static ir_node *equivalent_node_Proj_Load(ir_node *proj)
-{
- if (get_opt_ldst_only_null_ptr_exceptions()) {
- if (get_irn_mode(proj) == mode_X) {
- ir_node *load = get_Proj_pred(proj);
-
- /* get the Load address */
- const ir_node *addr = get_Load_ptr(load);
- const ir_node *confirm;
-
- if (value_not_null(addr, &confirm)) {
- if (get_Proj_proj(proj) == pn_Load_X_except) {
- ir_graph *irg = get_irn_irg(proj);
- DBG_OPT_EXC_REM(proj);
- return get_irg_bad(irg);
- }
- }
- }
- }
- return proj;
-} /* equivalent_node_Proj_Load */
-
-/**
- * Optimize an Exception Proj(Store) with a non-null address.
- */
-static ir_node *equivalent_node_Proj_Store(ir_node *proj)
-{
- if (get_opt_ldst_only_null_ptr_exceptions()) {
- if (get_irn_mode(proj) == mode_X) {
- ir_node *store = get_Proj_pred(proj);
-
- /* get the load/store address */
- const ir_node *addr = get_Store_ptr(store);
- const ir_node *confirm;
-
- if (value_not_null(addr, &confirm)) {
- if (get_Proj_proj(proj) == pn_Store_X_except) {
- ir_graph *irg = get_irn_irg(proj);
- DBG_OPT_EXC_REM(proj);
- return get_irg_bad(irg);
- }
- }
- }
- }
- return proj;
-} /* equivalent_node_Proj_Store */
-
/**
* Does all optimizations on nodes that must be done on its Projs
* because of creating new nodes.
static ir_node *equivalent_node_Proj(ir_node *proj)
{
ir_node *n = get_Proj_pred(proj);
-
- if (get_irn_mode(proj) == mode_X) {
- if (is_Block_dead(get_nodes_block(n))) {
- /* Remove dead control flow -- early gigo(). */
- ir_graph *irg = get_irn_irg(proj);
- return get_irg_bad(irg);
- }
- }
if (n->op->ops.equivalent_node_Proj)
return n->op->ops.equivalent_node_Proj(proj);
return proj;
break
switch (code) {
- CASE(Block);
- CASE(Jmp);
- CASE(Raise);
CASE(Eor);
CASE(Add);
CASE(Shl);
CASE(And);
CASE(Conv);
CASE(Phi);
- CASE(Sync);
CASE_PROJ(Tuple);
CASE_PROJ(Div);
CASE_PROJ(CopyB);
CASE_PROJ(Bound);
- CASE_PROJ(Load);
- CASE_PROJ(Store);
CASE(Proj);
CASE(Id);
CASE(Mux);
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(blk));
- set_Tuple_pred(n, pn_Div_X_except, get_irg_bad(irg));
+ set_Tuple_pred(n, pn_Div_X_except, new_r_Bad(irg, mode_X));
set_Tuple_pred(n, pn_Div_res, value);
}
return n;
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(blk));
- set_Tuple_pred(n, pn_Mod_X_except, get_irg_bad(irg));
+ set_Tuple_pred(n, pn_Mod_X_except, new_r_Bad(irg, mode_X));
set_Tuple_pred(n, pn_Mod_res, value);
}
return n;
jmp = new_r_Jmp(blk);
turn_into_tuple(n, pn_Cond_max);
if (ta == tarval_b_true) {
- set_Tuple_pred(n, pn_Cond_false, get_irg_bad(irg));
+ set_Tuple_pred(n, pn_Cond_false, new_r_Bad(irg, mode_X));
set_Tuple_pred(n, pn_Cond_true, jmp);
} else {
set_Tuple_pred(n, pn_Cond_false, jmp);
- set_Tuple_pred(n, pn_Cond_true, get_irg_bad(irg));
+ set_Tuple_pred(n, pn_Cond_true, new_r_Bad(irg, mode_X));
}
/* We might generate an endless loop, so keep it alive. */
add_End_keepalive(get_irg_end(irg), blk);
if (get_Proj_proj(proj) == pn_Load_X_except) {
ir_graph *irg = get_irn_irg(proj);
DBG_OPT_EXC_REM(proj);
- return get_irg_bad(irg);
+ return new_r_Bad(irg, mode_X);
} else {
ir_node *blk = get_nodes_block(load);
return new_r_Jmp(blk);
if (get_Proj_proj(proj) == pn_Store_X_except) {
ir_graph *irg = get_irn_irg(proj);
DBG_OPT_EXC_REM(proj);
- return get_irg_bad(irg);
+ return new_r_Bad(irg, mode_X);
} else {
ir_node *blk = get_nodes_block(store);
return new_r_Jmp(blk);
ir_graph *irg = get_irn_irg(proj);
/* we found an exception handler, remove it */
DBG_OPT_EXC_REM(proj);
- return get_irg_bad(irg);
+ return new_r_Bad(irg, mode_X);
}
case pn_Div_M: {
ir_graph *irg = get_irn_irg(proj);
/* we found an exception handler, remove it */
DBG_OPT_EXC_REM(proj);
- return get_irg_bad(irg);
+ return new_r_Bad(irg, mode_X);
}
case pn_Mod_M: {
} else {
ir_graph *irg = get_irn_irg(proj);
/* this case will NEVER be taken, kill it */
- return get_irg_bad(irg);
+ return new_r_Bad(irg, mode_X);
}
}
} else {
ir_relation cmp_result = tarval_cmp(b_vrp->range_bottom, tp);
ir_relation cmp_result2 = tarval_cmp(b_vrp->range_top, tp);
- if ((cmp_result & ir_relation_greater) == cmp_result && (cmp_result2
- & ir_relation_less) == cmp_result2) {
+ if ((cmp_result & ir_relation_greater) == cmp_result
+ && (cmp_result2 & ir_relation_less) == cmp_result2) {
ir_graph *irg = get_irn_irg(proj);
- return get_irg_bad(irg);
+ return new_r_Bad(irg, mode_X);
}
} else if (b_vrp->range_type == VRP_ANTIRANGE) {
ir_relation cmp_result = tarval_cmp(b_vrp->range_bottom, tp);
ir_relation cmp_result2 = tarval_cmp(b_vrp->range_top, tp);
- if ((cmp_result & ir_relation_less_equal) == cmp_result && (cmp_result2
- & ir_relation_greater_equal) == cmp_result2) {
+ if ((cmp_result & ir_relation_less_equal) == cmp_result
+ && (cmp_result2 & ir_relation_greater_equal) == cmp_result2) {
ir_graph *irg = get_irn_irg(proj);
- return get_irg_bad(irg);
+ return new_r_Bad(irg, mode_X);
}
}
b_vrp->bits_set
) == ir_relation_equal)) {
ir_graph *irg = get_irn_irg(proj);
- return get_irg_bad(irg);
+ return new_r_Bad(irg, mode_X);
}
if (!(tarval_cmp(
tarval_not(b_vrp->bits_not_set))
== ir_relation_equal)) {
ir_graph *irg = get_irn_irg(proj);
- return get_irg_bad(irg);
+ return new_r_Bad(irg, mode_X);
}
-
-
}
}
}
/* the following reassociations work only for == and != */
if (relation == ir_relation_equal || relation == ir_relation_less_greater) {
-
-#if 0 /* Might be not that good in general */
- /* a-b == 0 ==> a == b, a-b != 0 ==> a != b */
- if (tarval_is_null(tv) && is_Sub(left)) {
- right = get_Sub_right(left);
- left = get_Sub_left(left);
-
- tv = value_of(right);
- changed = 1;
- DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_C);
- }
-#endif
-
if (tv != tarval_bad) {
/* a-c1 == c2 ==> a == c2+c1, a-c1 != c2 ==> a != c2+c1 */
if (is_Sub(left)) {
DBG_OPT_EXC_REM(proj);
proj = new_r_Jmp(get_nodes_block(copyb));
break;
- case pn_CopyB_X_except:
+ case pn_CopyB_X_except: {
+ ir_graph *irg = get_irn_irg(proj);
DBG_OPT_EXC_REM(proj);
- proj = get_irg_bad(get_irn_irg(proj));
+ proj = new_r_Bad(irg, mode_X);
break;
+ }
default:
break;
}
break;
case pn_Bound_X_except:
DBG_OPT_EXC_REM(proj);
- proj = get_irg_bad(get_irn_irg(proj));
+ proj = new_r_Bad(get_irn_irg(proj), mode_X);
break;
case pn_Bound_res:
proj = idx;
return proj;
} /* transform_node_Proj */
-/**
- * Move Confirms down through Phi nodes.
- */
+static bool is_block_unreachable(const ir_node *block)
+{
+ const ir_graph *irg = get_irn_irg(block);
+ if (!is_irg_state(irg, IR_GRAPH_STATE_BAD_BLOCK))
+ return false;
+ return get_Block_dom_depth(block) < 0;
+}
+
+static ir_node *transform_node_Block(ir_node *block)
+{
+ ir_graph *irg = get_irn_irg(block);
+ int arity = get_irn_arity(block);
+ ir_node *bad = NULL;
+ int i;
+
+ if (!is_irg_state(irg, IR_GRAPH_STATE_BAD_BLOCK))
+ return block;
+
+ for (i = 0; i < arity; ++i) {
+ ir_node *pred = get_Block_cfgpred(block, i);
+ ir_node *pred_block = get_nodes_block(pred);
+ if (!is_Bad(pred) && !is_block_unreachable(pred_block))
+ continue;
+ if (bad == NULL)
+ bad = new_r_Bad(irg, mode_X);
+ set_irn_n(block, i, bad);
+ }
+
+ return block;
+}
+
static ir_node *transform_node_Phi(ir_node *phi)
{
- int i, n;
- ir_mode *mode = get_irn_mode(phi);
+ int n = get_irn_arity(phi);
+ ir_mode *mode = get_irn_mode(phi);
+ ir_node *block = get_nodes_block(phi);
+ ir_graph *irg = get_irn_irg(phi);
+ ir_node *bad = NULL;
+ int i;
+
+ /* Set phi-operands for bad-block inputs to bad */
+ for (i = 0; i < n; ++i) {
+ ir_node *pred = get_Block_cfgpred(block, i);
+ if (is_Bad(pred) || is_block_unreachable(get_nodes_block(pred))) {
+ if (bad == NULL)
+ bad = new_r_Bad(irg, mode);
+ set_irn_n(phi, i, bad);
+ }
+ }
+ /* Move Confirms down through Phi nodes. */
if (mode_is_reference(mode)) {
n = get_irn_arity(phi);
{
ir_node *left, *right;
ir_mode *mode;
+ ir_mode *count_mode;
ir_tarval *tv1, *tv2, *res;
ir_node *in[2], *irn, *block;
ir_graph *irg;
+ int modulo_shf;
left = get_binop_left(n);
return n;
right = get_binop_right(n);
- tv1 = value_of(right);
+ tv1 = value_of(right);
if (tv1 == tarval_bad)
return n;
if (tv2 == tarval_bad)
return n;
- res = tarval_add(tv1, tv2);
- mode = get_irn_mode(n);
- irg = get_irn_irg(n);
+ count_mode = get_tarval_mode(tv1);
+ if (get_tarval_mode(tv2) != count_mode) {
+ /* TODO: search bigger mode or something and convert... */
+ return n;
+ }
- /* beware: a simple replacement works only, if res < modulo shift */
- if (!is_Rotl(n)) {
- int modulo_shf = get_mode_modulo_shift(mode);
- if (modulo_shf > 0) {
- ir_tarval *modulo = new_tarval_from_long(modulo_shf,
- get_tarval_mode(res));
+ mode = get_irn_mode(n);
+ modulo_shf = get_mode_modulo_shift(mode);
- assert(modulo_shf >= (int) get_mode_size_bits(mode));
+ if (modulo_shf > 0) {
+ ir_tarval *modulo_mask = new_tarval_from_long(modulo_shf-1, count_mode);
- /* shifting too much */
- if (!(tarval_cmp(res, modulo) & ir_relation_less)) {
- if (is_Shrs(n)) {
- ir_node *block = get_nodes_block(n);
- dbg_info *dbgi = get_irn_dbg_info(n);
- ir_mode *smode = get_irn_mode(right);
- ir_node *cnst = new_r_Const_long(irg, smode, get_mode_size_bits(mode) - 1);
- return new_rd_Shrs(dbgi, block, get_binop_left(left), cnst, mode);
- }
+ /* I'm not so sure what happens in one complement... */
+ assert(get_mode_arithmetic(count_mode) == irma_twos_complement);
+ /* modulo shifts should always be a power of 2 (otherwise modulo_mask
+ * above will be invalid) */
+ assert(modulo_shf<=0 || is_po2(modulo_shf));
+
+ tv1 = tarval_and(tv1, modulo_mask);
+ tv2 = tarval_and(tv2, modulo_mask);
+ }
+ res = tarval_add(tv1, tv2);
+ irg = get_irn_irg(n);
- return new_r_Const(irg, get_mode_null(mode));
+ /* beware: a simple replacement works only, if res < modulo shift */
+ if (is_Rotl(n)) {
+ int bits = get_mode_size_bits(mode);
+ ir_tarval *modulo = new_tarval_from_long(bits, count_mode);
+ res = tarval_mod(res, modulo);
+ } else {
+ long bits = get_mode_size_bits(mode);
+ ir_tarval *mode_size = new_tarval_from_long(bits, count_mode);
+
+ /* shifting too much */
+ if (!(tarval_cmp(res, mode_size) & ir_relation_less)) {
+ if (is_Shrs(n)) {
+ ir_node *block = get_nodes_block(n);
+ dbg_info *dbgi = get_irn_dbg_info(n);
+ ir_mode *smode = get_irn_mode(right);
+ ir_node *cnst = new_r_Const_long(irg, smode, get_mode_size_bits(mode) - 1);
+ return new_rd_Shrs(dbgi, block, get_binop_left(left), cnst, mode);
}
+
+ return new_r_Const(irg, get_mode_null(mode));
}
- } else {
- res = tarval_mod(res, new_tarval_from_long(get_mode_size_bits(mode), get_tarval_mode(res)));
}
/* ok, we can replace it */
+ assert(modulo_shf >= (int) get_mode_size_bits(mode));
block = get_nodes_block(n);
in[0] = get_binop_left(left);
DBG_OPT_ALGSIM0(n, irn, FS_OPT_REASSOC_SHIFT);
return transform_node(irn);
-} /* transform_node_shift */
+}
/**
* normalisation: (x & c1) >> c2 to (x >> c2) & (c1 >> c2)
ir_node *b = get_Shrs_right(n);
ir_mode *mode = get_irn_mode(n);
+ if (is_oversize_shift(n)) {
+ ir_node *block = get_nodes_block(n);
+ dbg_info *dbgi = get_irn_dbg_info(n);
+ ir_mode *cmode = get_irn_mode(b);
+ long val = get_mode_size_bits(cmode)-1;
+ ir_graph *irg = get_irn_irg(n);
+ ir_node *cnst = new_r_Const_long(irg, cmode, val);
+ return new_rd_Shrs(dbgi, block, a, cnst, mode);
+ }
+
HANDLE_BINOP_PHI((eval_func) tarval_shrs, a, b, c, mode);
n = transform_node_shift(n);
for (i = j = 0; i < n_keepalives; ++i) {
ir_node *ka = get_End_keepalive(n, i);
- if (is_Block(ka)) {
- if (! is_Block_dead(ka)) {
- in[j++] = ka;
- }
+ ir_node *block;
+ /* no need to keep Bad */
+ if (is_Bad(ka))
continue;
- } else if (is_irn_pinned_in_irg(ka) && is_Block_dead(get_nodes_block(ka))) {
+ /* dont keep unreachable code */
+ block = is_Block(ka) ? ka : get_nodes_block(ka);
+ if (is_block_unreachable(block))
continue;
- } else if (is_Bad(ka)) {
- /* no need to keep Bad */
- continue;
- }
in[j++] = ka;
}
if (j != n_keepalives)
int pred_arity;
int j;
+ /* Remove Bad predecessors */
+ if (is_Bad(pred)) {
+ del_Sync_n(n, i);
+ --arity;
+ continue;
+ }
+
+ /* Remove duplicate predecessors */
+ for (j = 0; j < i; ++j) {
+ if (get_Sync_pred(n, j) == pred) {
+ del_Sync_n(n, i);
+ --arity;
+ break;
+ }
+ }
+ if (j < i)
+ continue;
+
if (!is_Sync(pred)) {
++i;
continue;
}
}
+ if (arity == 0) {
+ ir_graph *irg = get_irn_irg(n);
+ return new_r_Bad(irg, mode_M);
+ }
+ if (arity == 1) {
+ return get_Sync_pred(n, 0);
+ }
+
/* rehash the sync node */
add_identities(n);
+ return n;
+}
+
+static ir_node *transform_node_Load(ir_node *n)
+{
+ /* if our memory predecessor is a load from the same address, then reuse the
+ * previous result */
+ ir_node *mem = get_Load_mem(n);
+ ir_node *mem_pred;
+
+ if (!is_Proj(mem))
+ return n;
+ /* don't touch volatile loads */
+ if (get_Load_volatility(n) == volatility_is_volatile)
+ return n;
+ mem_pred = get_Proj_pred(mem);
+ if (is_Load(mem_pred)) {
+ ir_node *pred_load = mem_pred;
+
+ /* conservatively compare the 2 loads. TODO: This could be less strict
+ * with fixup code in some situations (like smaller/bigger modes) */
+ if (get_Load_ptr(pred_load) != get_Load_ptr(n))
+ return n;
+ if (get_Load_mode(pred_load) != get_Load_mode(n))
+ return n;
+ /* all combinations of aligned/unaligned pred/n should be fine so we do
+ * not compare the unaligned attribute */
+ {
+ ir_node *block = get_nodes_block(n);
+ ir_node *jmp = new_r_Jmp(block);
+ ir_graph *irg = get_irn_irg(n);
+ ir_node *bad = new_r_Bad(irg, mode_X);
+ ir_mode *mode = get_Load_mode(n);
+ ir_node *res = new_r_Proj(pred_load, mode, pn_Load_res);
+ ir_node *in[pn_Load_max] = { mem, jmp, bad, res };
+ ir_node *tuple = new_r_Tuple(block, ARRAY_SIZE(in), in);
+ return tuple;
+ }
+ } else if (is_Store(mem_pred)) {
+ ir_node *pred_store = mem_pred;
+ ir_node *value = get_Store_value(pred_store);
+
+ if (get_Store_ptr(pred_store) != get_Load_ptr(n))
+ return n;
+ if (get_irn_mode(value) != get_Load_mode(n))
+ return n;
+ /* all combinations of aligned/unaligned pred/n should be fine so we do
+ * not compare the unaligned attribute */
+ {
+ ir_node *block = get_nodes_block(n);
+ ir_node *jmp = new_r_Jmp(block);
+ ir_graph *irg = get_irn_irg(n);
+ ir_node *bad = new_r_Bad(irg, mode_X);
+ ir_node *res = value;
+ ir_node *in[pn_Load_max] = { mem, jmp, bad, res };
+ ir_node *tuple = new_r_Tuple(block, ARRAY_SIZE(in), in);
+ return tuple;
+ }
+ }
return n;
-} /* transform_node_Sync */
+}
/**
* optimize a trampoline Call into a direct Call
switch (code) {
CASE(Add);
CASE(And);
+ CASE(Block);
CASE(Call);
CASE(Cmp);
CASE(Conv);
CASE(Sync);
CASE_PROJ(Bound);
CASE_PROJ(CopyB);
- CASE_PROJ(Load);
CASE_PROJ(Store);
CASE_PROJ_EX(Cond);
CASE_PROJ_EX(Div);
+ CASE_PROJ_EX(Load);
CASE_PROJ_EX(Mod);
default:
/* leave NULL */;
current_ir_graph = rem;
} /* visit_all_identities */
-/**
- * Garbage in, garbage out. If a node has a dead input, i.e., the
- * Bad node is input to the node, return the Bad node.
- */
-static ir_node *gigo(ir_node *node)
-{
- int i, irn_arity;
- ir_op *op = get_irn_op(node);
-
- /* remove garbage blocks by looking at control flow that leaves the block
- and replacing the control flow by Bad. */
- if (get_irn_mode(node) == mode_X) {
- ir_node *block = get_nodes_block(skip_Proj(node));
- ir_graph *irg = get_irn_irg(block);
-
- /* Don't optimize nodes in immature blocks. */
- if (!get_Block_matured(block))
- return node;
- /* Don't optimize End, may have Bads. */
- if (op == op_End) return node;
-
- if (is_Block(block)) {
- if (is_Block_dead(block)) {
- /* control flow from dead block is dead */
- return get_irg_bad(irg);
- }
-
- for (i = get_irn_arity(block) - 1; i >= 0; --i) {
- if (!is_Bad(get_irn_n(block, i)))
- break;
- }
- if (i < 0) {
- ir_graph *irg = get_irn_irg(block);
- /* the start block is never dead */
- if (block != get_irg_start_block(irg)
- && block != get_irg_end_block(irg)) {
- /*
- * Do NOT kill control flow without setting
- * the block to dead of bad things can happen:
- * We get a Block that is not reachable be irg_block_walk()
- * but can be found by irg_walk()!
- */
- set_Block_dead(block);
- return get_irg_bad(irg);
- }
- }
- }
- }
-
- /* Blocks, Phis and Tuples may have dead inputs, e.g., if one of the
- blocks predecessors is dead. */
- if (op != op_Block && op != op_Phi && op != op_Tuple && op != op_Anchor) {
- ir_graph *irg = get_irn_irg(node);
- irn_arity = get_irn_arity(node);
-
- /*
- * Beware: we can only read the block of a non-floating node.
- */
- if (is_irn_pinned_in_irg(node) &&
- is_Block_dead(get_nodes_block(skip_Proj(node))))
- return get_irg_bad(irg);
-
- for (i = 0; i < irn_arity; i++) {
- ir_node *pred = get_irn_n(node, i);
-
- if (is_Bad(pred))
- return get_irg_bad(irg);
-#if 0
- /* Propagating Unknowns here seems to be a bad idea, because
- sometimes we need a node as a input and did not want that
- it kills its user.
- However, it might be useful to move this into a later phase
- (if you think that optimizing such code is useful). */
- if (is_Unknown(pred) && mode_is_data(get_irn_mode(node)))
- return new_r_Unknown(irg, get_irn_mode(node));
-#endif
- }
- }
-#if 0
- /* With this code we violate the agreement that local_optimize
- only leaves Bads in Block, Phi and Tuple nodes. */
- /* If Block has only Bads as predecessors it's garbage. */
- /* If Phi has only Bads as predecessors it's garbage. */
- if ((op == op_Block && get_Block_matured(node)) || op == op_Phi) {
- irn_arity = get_irn_arity(node);
- for (i = 0; i < irn_arity; i++) {
- if (!is_Bad(get_irn_n(node, i))) break;
- }
- if (i == irn_arity) node = get_irg_bad(irg);
- }
-#endif
- return node;
-} /* gigo */
-
/**
* These optimizations deallocate nodes from the obstack.
* It can only be called if it is guaranteed that no other nodes
/* Always optimize Phi nodes: part of the construction. */
if ((!get_opt_optimize()) && (iro != iro_Phi)) return n;
- /* Remove nodes with dead (Bad) input.
- Run always for transformation induced Bads. */
- n = gigo(n);
- if (n != oldn) {
- edges_node_deleted(oldn);
-
- /* We found an existing, better node, so we can deallocate the old node. */
- irg_kill_node(irg, oldn);
- return n;
- }
-
/* constant expression evaluation / constant folding */
if (get_opt_constant_folding()) {
/* neither constants nor Tuple values can be evaluated */
if (iro == iro_Deleted)
return n;
- /* Remove nodes with dead (Bad) input.
- Run always for transformation induced Bads. */
- n = gigo(n);
- if (is_Bad(n))
- return n;
-
/* constant expression evaluation / constant folding */
if (get_opt_constant_folding()) {
/* neither constants nor Tuple values can be evaluated */
if (get_opt_global_cse())
set_irg_pinned(irg, op_pin_state_floats);
- if (get_irg_outs_state(irg) == outs_consistent)
- set_irg_outs_inconsistent(irg);
/* FIXME: Maybe we could also test whether optimizing the node can
change the control graph. */
* @return
* The operations.
*/
-static ir_op_ops *firm_set_default_hash(ir_opcode code, ir_op_ops *ops)
+static ir_op_ops *firm_set_default_hash(unsigned code, ir_op_ops *ops)
{
#define CASE(a) \
case iro_##a: \
/*
* Sets the default operation for an ir_ops.
*/
-ir_op_ops *firm_set_default_operations(ir_opcode code, ir_op_ops *ops)
+ir_op_ops *firm_set_default_operations(unsigned code, ir_op_ops *ops)
{
ops = firm_set_default_hash(code, ops);
ops = firm_set_default_computed_value(code, ops);
projects / libfirm / blobdiff