X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fscripts%2Fgenerate_new_opcodes.pl;h=7e8a84c666ec5ba3c5cb24d11d03a7fca708df4b;hb=205396c4f4f5abe7abd6dc2350c8c398a7623afc;hp=5f68400ffd23aa05731928862279cda81f1925f2;hpb=ac8e2d19d7a8f1f4ef7f428177cee9bc4d1d43e9;p=libfirm

diff --git a/ir/be/scripts/generate_new_opcodes.pl b/ir/be/scripts/generate_new_opcodes.pl
index 5f68400ff..7e8a84c66 100755
--- a/ir/be/scripts/generate_new_opcodes.pl
+++ b/ir/be/scripts/generate_new_opcodes.pl
@@ -16,7 +16,10 @@ my $cur_op     = "";
 my $line_nr    = 0;
 
 our $arch;
+our $additional_opcodes;
 our %nodes;
+our %cpu;
+our $default_cmp_attr;
 
 # include spec file
 
@@ -24,9 +27,9 @@ my $return;
 
 no strict "subs";
 unless ($return = do $specfile) {
-	warn "couldn't parse $specfile: $@" if $@;
-	warn "couldn't do $specfile: $!"    unless defined $return;
-	warn "couldn't run $specfile"       unless $return;
+	die "couldn't parse $specfile: $@" if $@;
+	die "couldn't do $specfile: $!"    unless defined $return;
+	die "couldn't run $specfile"       unless $return;
 }
 use strict "subs";
 
@@ -34,6 +37,7 @@ my $target_c = $target_dir."/gen_".$arch."_new_nodes.c.inl";
 my $target_h = $target_dir."/gen_".$arch."_new_nodes.h";
 
 #print Dumper(%nodes);
+#print Dumper(%operands);
 
 # create c code file from specs
 
@@ -41,42 +45,108 @@ my @obst_opvar;       # stack for the "ir_op *op_<arch>_<op-name> = NULL;" state
 my @obst_get_opvar;   # stack for the get_op_<arch>_<op-name>() functions
 my @obst_constructor; # stack for node constructor functions
 my @obst_new_irop;    # stack for the new_ir_op calls
+my @obst_enum_op;     # stack for creating the <arch>_opcode enum
 my @obst_header;      # stack for function prototypes
 my @obst_is_archirn;  # stack for the is_$arch_irn() function
 my @obst_cmp_attr;    # stack for the compare attribute functions
+my @obst_proj;        # stack for the pn_ numbers
 my $orig_op;
 my $arity;
 my $cmp_attr_func;
 my $temp;
+my $n_opcodes = 0;    # number of opcodes
+
+# for registering additional opcodes
+$n_opcodes += $additional_opcodes if (defined($additional_opcodes));
 
 push(@obst_header, "void ".$arch."_create_opcodes(void);\n");
 
+# create default compare function
+if(defined($default_cmp_attr)) {
+	my $cmpcode = $default_cmp_attr;
+	push(@obst_cmp_attr, "static int default_cmp_attr(ir_node *a, ir_node *b) {\n");
+	if($cmpcode =~ m/attr_a/) {
+		push(@obst_cmp_attr, "\t$arch\_attr_t *attr_a = get_$arch\_attr(a);\n");
+	}
+	if($cmpcode =~ m/attr_b/) {
+		push(@obst_cmp_attr, "\t$arch\_attr_t *attr_b = get_$arch\_attr(b);\n");
+	}
+	push(@obst_cmp_attr, "\t${cmpcode}\n");
+	push(@obst_cmp_attr, "}\n\n");
+}
+
+push(@obst_enum_op, "typedef enum _$arch\_opcodes {\n");
 foreach my $op (keys(%nodes)) {
-	my %n = %{ $nodes{"$op"} };
+	my %n        = %{ $nodes{"$op"} };
+	my $known_mode;
+	my $n_res    = 0;
+	my $num_outs = 0;
+	my @out_flags;
+
+	# determine arity from in requirements
+	$arity = exists($n{"arity"}) ? $n{"arity"} : 0;
+	if (exists($n{"reg_req"}) && exists($n{"reg_req"}{"in"})) {
+		$arity = scalar(@{ $n{"reg_req"}{"in"} });
+	}
 
 	$orig_op = $op;
 	$op      = $arch."_".$op;
-	$arity   = $n{"arity"};
 	$temp    = "";
 
+	# define some proj numbers
+	if (exists($n{"outs"})) {
+		undef my @outs;
+
+		@outs     = @{ $n{"outs"} };
+		$num_outs = $#outs + 1;
+
+		push(@obst_proj, "\nenum pn_$op {\n");
+
+		for (my $idx = 0; $idx <= $#outs; $idx++) {
+			# check, if we have additional flags annotated to out
+			if ($outs[$idx] =~ /:((S|I)(\|(S|I))*)/) {
+				push(@out_flags, $1);
+				$outs[$idx] =~ s/:((S|I)(\|(S|I))*)//;
+			}
+			push(@obst_proj, "  pn_$op\_".$outs[$idx]." = $idx,\n");
+		}
+
+		push(@obst_proj, "};\n");
+		$known_mode = "mode_T";
+	}
+	if (exists($n{"mode"})) {
+		$known_mode = $n{"mode"};
+	}
+
 	push(@obst_opvar, "ir_op *op_$op = NULL;\n");
-	push(@obst_get_opvar, "ir_op *get_op_$op(void)   { return op_$op; }\n");
-	push(@obst_get_opvar, "int    is_$op(const ir_node *n) { return get_irn_op(n) == op_$op; }\n\n");
+	push(@obst_get_opvar, "ir_op *get_op_$op(void)         { return op_$op; }\n");
+	push(@obst_get_opvar, "int    is_$op(const ir_node *n) { return get_$arch\_irn_opcode(n) == iro_$op; }\n\n");
 
 	push(@obst_is_archirn, "is_$op(node)");
 
+	push(@obst_header, "extern ir_op *op_$op;\n");
+	push(@obst_header, "ir_op *get_op_$op(void);\n");
 	push(@obst_header, "int is_$op(const ir_node *n);\n");
 
-	$cmp_attr_func = 0;
+	my $cmp_attr_func;
+	if(defined($default_cmp_attr)) {
+		$cmp_attr_func = "default_cmp_attr";
+	}
 	# create compare attribute function if needed
 	if (exists($n{"cmp_attr"})) {
+		my $cmpcode = $n{"cmp_attr"};
+
 		push(@obst_cmp_attr, "static int cmp_attr_$op(ir_node *a, ir_node *b) {\n");
-		push(@obst_cmp_attr, "  asmop_attr *attr_a = get_ia32_attr(a);\n");
-		push(@obst_cmp_attr, "  asmop_attr *attr_b = get_ia32_attr(b);\n");
-		push(@obst_cmp_attr, $n{"cmp_attr"});
+		if($cmpcode =~ m/attr_a/) {
+			push(@obst_cmp_attr, "\t$arch\_attr_t *attr_a = get_$arch\_attr(a);\n");
+		}
+		if($cmpcode =~ m/attr_b/) {
+			push(@obst_cmp_attr, "\t$arch\_attr_t *attr_b = get_$arch\_attr(b);\n");
+		}
+		push(@obst_cmp_attr, "\t${cmpcode}\n");
 		push(@obst_cmp_attr, "}\n\n");
 
-		$cmp_attr_func = 1;
+		$cmp_attr_func = "cmp_attr_${op}";
 	}
 
 	if (exists($n{"rd_constructor"}) && $n{"rd_constructor"} =~ /^NONE$/i) {
@@ -95,16 +165,18 @@ foreach my $op (keys(%nodes)) {
 
 		$temp = "ir_node *new_rd_$op(dbg_info *db, ir_graph *irg, ir_node *block";
 		if (!exists($n{"args"}) || $n{"args"} =~ /^DEFAULT$/i) { # default args
-			if ($n{"arity"} !~ /^\d+$/) {
+			if ($arity !~ /^\d+$/) {
 				print "DEFAULT args require numeric arity (0, 1, 2, ...)! Ignoring op $orig_op!\n";
 				next;
 			}
-			for (my $i = 1; $i <= $n{"arity"}; $i++) {
+			for (my $i = 1; $i <= $arity; $i++) {
 				$complete_args .= ", ir_node *op".$i;
 				$arg_names     .= ", op".$i;
 			}
-			$complete_args .= ", ir_mode *mode";
-			$arg_names     .= ", mode";
+			if (!defined($known_mode)) {
+				$complete_args .= ", ir_mode *mode";
+				$arg_names     .= ", mode";
+			}
 		}
 		else { # user defined args
 			for my $href (@{ $n{"args"} }) {
@@ -113,44 +185,41 @@ foreach my $op (keys(%nodes)) {
 				$arg_names      .= ", ".$href->{"name"};
 			}
 		}
-		$complete_args = substr($complete_args, 2);
-		$temp .= ", $complete_args)";
+
+		# we have additional attribute arguements
+		if (exists($n{"attr"})) {
+			$complete_args .= ", ".$n{"attr"};
+		}
+
+		# $complete_args = substr($complete_args, 2);
+		$temp .= "$complete_args)";
 		push(@obst_constructor, $temp." {\n");
+		push(@obst_header, $n{"comment"});
 		push(@obst_header, $temp.";\n");
 
 		# emit constructor code
 		if (!exists($n{"rd_constructor"}) || $n{"rd_constructor"} =~ /^DEFAULT$/i) { # default constructor
-			if ($n{"arity"} !~ /^\d+$/) {
-				print "DEFAULT rd_constructor requires arity 0,1,2 or 3! Ignoring op $orig_op!\n";
+			if ($arity !~ /^\d+$/) {
+				print "DEFAULT rd_constructor requires numeric arity! Ignoring op $orig_op!\n";
 				next;
 			}
-			$temp  = "  asmop_attr *attr;\n";
-			$temp .= "  ir_node *res;\n";
-			$temp .= "  ir_node *in[$arity];\n" if ($arity > 0);
-			$temp .= "\n";
-			$temp .= "  if (!op_$op) {\n";
-			$temp .= "    assert(0);\n";
-			$temp .= "    return NULL;\n";
-			$temp .= "  }\n\n";
-			for (my $i = 1; $i <= $arity; $i++) {
-				$temp .= "  in[".($i - 1)."] = op".$i.";\n";
-			}
-			$temp .= "  res = new_ir_node(db, irg, block, op_$op, mode, $arity, ".($arity > 0 ? "in" : "NULL").");\n";
-			$temp .= "  set_ia32_pncode(res, -1);\n";
-			$temp .= "  res = optimize_node(res);\n";
-			$temp .= "  irn_vrfy_irg(res, irg);\n\n";
-
-			# set register flags
-			$temp .= "  attr = get_ia32_attr(res);\n\n";
-			$temp .= "  attr->flags  = 0;                                 /* clear flags */\n";
-			if (exists($n{"spill"}) && $n{"spill"} == 0) {
-				$temp .= "  attr->flags |= arch_irn_flags_dont_spill;          /* op is NOT spillable */\n";
-			}
-			if (exists($n{"remat"}) && $n{"remat"} == 1) {
-				$temp .= "  attr->flags |= arch_irn_flags_rematerializable;   /* op can be easily recalulated */\n";
+
+			$temp  = "\tir_node *res;\n";
+			$temp .= "\tir_node *in[$arity];\n" if ($arity > 0);
+			$temp .= "\tint flags = 0;\n";
+			$temp .= "\t$arch\_attr_t *attr;\n" if (exists($n{"init_attr"}));
+
+			my $exec_units = "NULL";
+			# set up static variables for cpu execution unit assigments
+			if (exists($n{"units"})) {
+				$temp .= gen_execunit_list_initializer($n{"units"});
+				$exec_units = "_exec_units";
 			}
 
-			# allocate memory and set pointer to register requirements
+			undef my $in_req_var;
+			undef my $out_req_var;
+
+			# set up static variables for requirements and registers
 			if (exists($n{"reg_req"})) {
 				my %req = %{ $n{"reg_req"} };
 				my $idx;
@@ -161,28 +230,131 @@ foreach my $op (keys(%nodes)) {
 				@out = @{ $req{"out"} } if exists(($req{"out"}));
 
 				if (@in) {
-					$temp .= "\n  /* allocate memory for IN register requirements and assigned registers */\n";
-					$temp .= "  attr->in_req    = calloc(".($#in + 1).", sizeof(arch_register_req_t *));  /* space for in requirements */\n";
+					$in_req_var = "_in_req_$op";
+					$temp .= "\tstatic const arch_register_req_t *".$in_req_var."[] =\n";
+					$temp .= "\t{\n";
 					for ($idx = 0; $idx <= $#in; $idx++) {
-						$temp .= "  attr->in_req[$idx] = ".$op."_reg_req_in_".$idx.";\n";
+						$temp .= "\t\t&".$op."_reg_req_in_".$idx.",\n";
 					}
+					$temp .= "\t};\n";
 				}
 
 				if (@out) {
-					$temp .= "\n  /* allocate memory for OUT register requirements and assigned registers */\n";
-					$temp .= "  attr->out_req    = calloc(".($#out + 1).", sizeof(arch_register_req_t *)); /* space for out requirements */\n";
-					$temp .= "  attr->slots      = calloc(".($#out + 1).", sizeof(arch_register_t *));     /* space for assigned registers */\n";
+					$out_req_var = "_out_req_$op";
+
+					$temp .= "\tstatic const arch_register_req_t *".$out_req_var."[] =\n";
+					$temp .= "\t{\n";
 					for ($idx = 0; $idx <= $#out; $idx++) {
-						$temp .= "  attr->out_req[$idx] = ".$op."_reg_req_out_".$idx.";\n";
+						$temp .= "\t\t&".$op."_reg_req_out_".$idx.",\n";
+					}
+					$temp .= "\t};\n";
+				}
+			}
+
+			$temp .= "\n";
+			$temp .= "\tassert(op_$op != NULL);\n\n";
+
+			for (my $i = 1; $i <= $arity; $i++) {
+				$temp .= "\tin[".($i - 1)."] = op".$i.";\n";
+			}
+
+			# set flags
+			if (exists($n{"irn_flags"})) {
+				foreach my $flag (split(/\|/, $n{"irn_flags"})) {
+					if ($flag eq "R") {
+						$temp .= "\tflags |= arch_irn_flags_rematerializable;   /* op can be easily recalculated */\n";
+					}
+					elsif ($flag eq "N") {
+						$temp .= "\tflags |= arch_irn_flags_dont_spill;         /* op is NOT spillable */\n";
+					}
+					elsif ($flag eq "I") {
+						$temp .= "\tflags |= arch_irn_flags_ignore;             /* ignore op for register allocation */\n";
 					}
-					$temp .= "  attr->n_res      = ".($#out + 1).";\n";
+					elsif ($flag eq "S") {
+						$temp .= "\tflags |= arch_irn_flags_modify_sp;          /* op modifies stack pointer */\n";
+					}
+				}
+			}
+
+			my $in_param;
+			my $out_param;
+			# allocate memory and set pointer to register requirements
+			if (exists($n{"reg_req"})) {
+				my %req = %{ $n{"reg_req"} };
+
+				undef my @in;
+				@in = @{ $req{"in"} } if (exists($req{"in"}));
+				undef my @out;
+				@out = @{ $req{"out"} } if exists(($req{"out"}));
+
+				if (@in) {
+					$in_param = $in_req_var;
+				}
+				else {
+					$in_param = "NULL";
+				}
+
+				if (@out) {
+					$n_res     = $#out + 1;
+					$out_param = "$out_req_var, $exec_units, $n_res";
 				}
 				else {
-					$temp .= "  attr->n_res      = 0;\n";
+					$out_param = "NULL, $exec_units, 0";
+				}
+			}
+			else {
+				$in_param  = "NULL";
+				$out_param = "NULL, $exec_units, 0";
+			}
+			$temp .= "\n\t/* create node */\n";
+
+			my $latency = 1;
+			if (exists($n{"latency"})) {
+				$latency = $n{"latency"};
+			}
+
+			my $mode = "mode";
+			if (defined($known_mode)) {
+				$mode = $known_mode;
+			}
+			$temp .= "\tres = new_ir_node(db, irg, block, op_$op, $mode, $arity, ".($arity > 0 ? "in" : "NULL").");\n";
+
+			$temp .= "\n\t/* init node attributes */\n";
+			$temp .= "\tinit_$arch\_attributes(res, flags, $in_param, $out_param, $latency);\n";
+
+			# set flags for outs
+			if ($#out_flags >= 0) {
+				$temp .= "\n\t/* set flags for outs */\n";
+				for (my $idx = 0; $idx <= $#out_flags; $idx++) {
+					my $flags  = "";
+					my $prefix = "";
+
+					foreach my $flag (split(/\|/, $out_flags[$idx])) {
+						if ($flag eq "I") {
+							$flags .= $prefix."arch_irn_flags_ignore";
+							$prefix = " | ";
+						}
+						elsif ($flag eq "S") {
+							$flags .= $prefix."arch_irn_flags_modify_sp";
+							$prefix = " | ";
+						}
+					}
+
+					$temp .= "\tset_$arch\_out_flags(res, $flags, $idx);\n";
 				}
 			}
 
-			$temp .= "\n  return res;\n";
+
+			if (exists($n{"init_attr"})) {
+				$temp .= "\tattr = get_$arch\_attr(res);\n";
+				$temp .= $n{"init_attr"}."\n";
+			}
+
+			$temp .= "\n\t/* optimize node */\n";
+			$temp .= "\tres = optimize_node(res);\n";
+			$temp .= "\tirn_vrfy_irg(res, irg);\n\n";
+
+			$temp .= "\n\treturn res;\n";
 
 			push(@obst_constructor, $temp);
 		}
@@ -192,41 +364,105 @@ foreach my $op (keys(%nodes)) {
 
 		# close constructor function
 		push(@obst_constructor, "}\n\n");
-
 	} # constructor creation
 
 	# set default values for state and flags if not given
-	$n{"state"}    = "pinned" if (! exists($n{"state"}));
+	$n{"state"}    = "floats" if (! exists($n{"state"}));
 	$n{"op_flags"} = "N"      if (! exists($n{"op_flags"}));
 
-	push(@obst_new_irop, "\n  memset(&ops, 0, sizeof(ops));\n");
-	push(@obst_new_irop, "  ops.dump_node     = dump_node_$arch;\n");
 
-	if ($cmp_attr_func) {
-		push(@obst_new_irop, "  ops.node_cmp_attr = cmp_attr_$op;\n");
+	push(@obst_new_irop, "\n\tmemset(&ops, 0, sizeof(ops));\n");
+	push(@obst_new_irop, "\tops.dump_node     = $arch\_dump_node;\n");
+
+	if (defined($cmp_attr_func)) {
+		push(@obst_new_irop, "\tops.node_cmp_attr = ${cmp_attr_func};\n");
 	}
 
-	$temp  = "  op_$op = new_ir_op(get_next_ir_opcode(), \"$op\", op_pin_state_".$n{"state"}.", ".$n{"op_flags"};
-	$temp .= ", ".translate_arity($arity).", 0, sizeof(asmop_attr), &ops);\n";
+	$n_opcodes++;
+	$temp  = "\top_$op = new_ir_op(cur_opcode + iro_$op, \"$op\", op_pin_state_".$n{"state"}.", ".$n{"op_flags"};
+	$temp .= "|M, ".translate_arity($arity).", 0, sizeof($arch\_attr_t) + $n_res * sizeof(arch_register_t *), &ops);\n";
 	push(@obst_new_irop, $temp);
+	push(@obst_new_irop, "\tset_op_tag(op_$op, &$arch\_op_tag);\n");
+	push(@obst_enum_op, "\tiro_$op,\n");
+
+	push(@obst_header, "\n");
 }
+push(@obst_enum_op, "\tiro_$arch\_last_generated,\n");
+push(@obst_enum_op, "\tiro_$arch\_last = iro_$arch\_last_generated");
+push(@obst_enum_op, " + $additional_opcodes") if (defined($additional_opcodes));
+push(@obst_enum_op, "\n} $arch\_opcodes;\n\n");
 
 # emit the code
 
 open(OUT, ">$target_c") || die("Could not open $target_c, reason: $!\n");
 
+print OUT "#include \"gen_$arch\_regalloc_if_t.h\"\n\n";
 print OUT @obst_cmp_attr;
 print OUT "\n";
 print OUT @obst_opvar;
 print OUT "\n";
 print OUT @obst_get_opvar;
 print OUT "\n";
-print OUT "int is_".$arch."_irn(const ir_node *node) {\n  if (".join(" ||\n      ", @obst_is_archirn).")\n    return 1;\n  else\n    return 0;\n}\n\n";
+
+print OUT<<EOF;
+
+static int $arch\_opcode_start = -1;
+static int $arch\_opcode_end   = -1;
+
+EOF
+
+# build the FOURCC arguments from $arch
+
+my ($a, $b, $c, $d) = ('\0', '\0', '\0', '\0');
+
+if (length($arch) >= 1) {
+	$a = uc(substr($arch, 0, 1));
+}
+
+if (length($arch) >= 2) {
+	$b = uc(substr($arch, 1, 1));
+}
+
+if (length($arch) >= 3) {
+	$c = uc(substr($arch, 2, 1));
+}
+
+if (length($arch) >= 4) {
+	$d = uc(substr($arch, 3, 1));
+}
+
+print OUT "static unsigned $arch\_op_tag = FOURCC('$a', '$b', '$c', '$d');\n";
+
+print OUT<<ENDOFISIRN;
+
+/** Return the opcode number of the first $arch opcode. */
+int get_$arch\_opcode_first(void) {
+	return $arch\_opcode_start;
+}
+
+/** Return the opcode number of the last $arch opcode + 1. */
+int get_$arch\_opcode_last(void) {
+	return $arch\_opcode_end;
+}
+
+/** Return 1 if the given node is a $arch machine node, 0 otherwise */
+int is_$arch\_irn(const ir_node *node) {
+	return get_op_tag(get_irn_op(node)) == &$arch\_op_tag;
+}
+
+int get_$arch\_irn_opcode(const ir_node *node) {
+	if (is_$arch\_irn(node))
+		return get_irn_opcode(node) - $arch\_opcode_start;
+	return -1;
+}
+
+ENDOFISIRN
+
 print OUT @obst_constructor;
 
 print OUT<<ENDOFMAIN;
 /**
- * Creates the $arch specific firm operations
+ * Creates the $arch specific Firm machine operations
  * needed for the assembler irgs.
  */
 void $arch\_create_opcodes(void) {
@@ -239,19 +475,46 @@ void $arch\_create_opcodes(void) {
 #define Y   irop_flag_forking
 #define H   irop_flag_highlevel
 #define c   irop_flag_constlike
+#define K   irop_flag_keep
+#define M   irop_flag_machine
+#define O   irop_flag_machine_op
+#define R   (irop_flag_user << 0)
 
-	ir_op_ops ops;
+	ir_op_ops  ops;
+	int        cur_opcode;
+	static int run_once = 0;
 
+	if (run_once)
+		return;
+	run_once = 1;
+
+	cur_opcode = get_next_ir_opcodes(iro_$arch\_last);
+
+	$arch\_opcode_start = cur_opcode;
 ENDOFMAIN
 
 print OUT @obst_new_irop;
+print OUT "\n";
+print OUT "\t$arch\_register_additional_opcodes(cur_opcode);\n" if (defined($additional_opcodes));
+print OUT "\t$arch\_opcode_end = cur_opcode + iro_$arch\_last";
+print OUT " + $additional_opcodes" if (defined($additional_opcodes));
+print OUT ";\n";
 print OUT "}\n";
 
 close(OUT);
 
 open(OUT, ">$target_h") || die("Could not open $target_h, reason: $!\n");
 
+print OUT "#ifndef __GEN_$arch\_NEW_NODES_H__\n";
+print OUT "#define __GEN_$arch\_NEW_NODES_H__\n\n";
+print OUT @obst_enum_op;
+print OUT "int is_$arch\_irn(const ir_node *node);\n\n";
+print OUT "int get_$arch\_opcode_first(void);\n";
+print OUT "int get_$arch\_opcode_last(void);\n";
+print OUT "int get_$arch\_irn_opcode(const ir_node *node);\n";
 print OUT @obst_header;
+print OUT @obst_proj;
+print OUT "\n#endif /* __GEN_$arch\_NEW_NODES_H__ */\n";
 
 close(OUT);
 
@@ -275,10 +538,78 @@ sub translate_arity {
 			return "oparity_trinary";
 		}
 		else {
-			return "$arity";
+			return "oparity_any";
 		}
 	}
 	else {
 		return "oparity_".$arity;
 	}
 }
+
+###
+# Return the list of pointers for the given execution units.
+###
+sub gen_execunit_list_initializer {
+	my $units   = shift;
+	my $uc_arch = uc($arch);
+	my $ret     = "";
+	my $ret2    = "";
+	my %init;
+
+	foreach my $unit (@{ $units }) {
+		if ($unit eq "DUMMY") {
+			push(@{ $init{"DUMMY"} }, "\t\t&be_machine_execution_units_DUMMY[0]");
+		}
+		elsif (exists($cpu{"$unit"})) {
+			# operation can be executed on all units of this type
+			# -> add them all
+			my $tp_name = "$arch\_execution_units_$unit";
+			my $idx     = 0;
+			foreach (@{ $cpu{"$unit"} }) {
+				next if ($idx++ == 0);  # skip first element (it's not a unit)
+				my $unit_name = "$uc_arch\_EXECUNIT_TP_$unit\_$_";
+				push(@{ $init{"$unit"} }, "\t\t&".$tp_name."[".$unit_name."]");
+			}
+		}
+		else {
+			# operation can be executed only a certain unit
+			# -> find corresponding unit type
+			my $found = 0;
+TP_SEARCH:	foreach my $cur_type (keys(%cpu)) {
+				foreach my $cur_unit (@{ $cpu{"$cur_type"} }) {
+					if ($unit eq $cur_unit) {
+						my $tp_name   = "$arch\_execution_units_$cur_type";
+						my $unit_name = "$uc_arch\_EXECUNIT_TP_$cur_type\_$unit";
+						push(@{ $init{"$unit"} }, "\t\t&".$tp_name."[".$unit_name."]");
+						$found = 1;
+						last TP_SEARCH;
+					}
+				}
+			}
+
+			if (! $found) {
+				print STDERR "Invalid execution unit $unit specified!\n";
+			}
+		}
+	}
+
+	# prepare the 2-dim array init
+	foreach my $key (keys(%init)) {
+		$ret .= "\tstatic const be_execution_unit_t *_allowed_units_".$key."[] =\n";
+		$ret .= "\t{\n";
+		foreach (@{ $init{"$key"} }) {
+			$ret .= "$_,\n";
+		}
+		$ret .= "\t\tNULL\n";
+		$ret .= "\t};\n";
+		$ret2 .= "\t\t_allowed_units_$key,\n";
+	}
+	$ret2 .= "\t\tNULL\n";
+
+	$ret .= "\tstatic const be_execution_unit_t **_exec_units[] =\n";
+	$ret .= "\t{\n";
+	$ret .= $ret2;
+	$ret .= "\t};\n";
+
+	return $ret;
+}