X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fscripts%2Fgenerate_new_opcodes.pl;h=9f40503d8ba8ffbcfcbe64a26fdaf5fb9fff9493;hb=df2faee01a5832057bb3ca0ba5f67e979c916e19;hp=ee29ed6963b7531b7f8d7f62632fc69921acf1ef;hpb=11107302f969142a3c0c833e970e8d8e434dd9be;p=libfirm

diff --git a/ir/be/scripts/generate_new_opcodes.pl b/ir/be/scripts/generate_new_opcodes.pl
index ee29ed696..9f40503d8 100755
--- a/ir/be/scripts/generate_new_opcodes.pl
+++ b/ir/be/scripts/generate_new_opcodes.pl
@@ -1,7 +1,7 @@
 #!/usr/bin/perl -w
 
 #
-# Copyright (C) 1995-2007 University of Karlsruhe.  All right reserved.
+# Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
 #
 # This file is part of libFirm.
 #
@@ -23,25 +23,24 @@
 # their coresponding node constructors for all operations in a given spec
 # so they can be used as normal firm nodes.
 # Creation: 2005/10/19
-# $Id$
 
 use strict;
 use Data::Dumper;
 
 my $specfile   = $ARGV[0];
 my $target_dir = $ARGV[1];
-my $state      = 1;
-my $cur_op     = "";
-my $line_nr    = 0;
 
 our $arch;
-our $additional_opcodes;
 our %nodes;
-our %cpu;
 our $default_attr_type;
 our $default_cmp_attr;
+our $default_copy_attr;
 our %init_attr;
+our $custom_init_attr_func;
 our %compare_attr;
+our %copy_attr;
+our %reg_classes;
+our %custom_irn_flags;
 
 # include spec file
 
@@ -49,9 +48,9 @@ my $return;
 
 no strict "subs";
 unless ($return = do $specfile) {
-	die "couldn't parse $specfile: $@" if $@;
-	die "couldn't do $specfile: $!"    unless defined $return;
-	die "couldn't run $specfile"       unless $return;
+	die "Fatal error: couldn't parse $specfile: $@" if $@;
+	die "Fatal error: couldn't do $specfile: $!"    unless defined $return;
+	die "Fatal error: couldn't run $specfile"       unless $return;
 }
 use strict "subs";
 
@@ -61,34 +60,33 @@ my $target_h = $target_dir."/gen_".$arch."_new_nodes.h";
 if(!defined($default_attr_type)) {
 	$default_attr_type = "${arch}_attr_t";
 }
-if(!defined(%init_attr)) {
+if(! %init_attr) {
 	%init_attr = (
-		"$default_attr_type" => "\tinit_${arch}_attributes(res, flags, in_reqs, out_reqs, exec_units, n_res, latency);",
+		"$default_attr_type" => "\tinit_${arch}_attributes(res, irn_flags_, in_reqs, n_res);",
 	);
 }
 if(!defined($default_cmp_attr)) {
 	$default_cmp_attr = "${arch}_compare_attr";
 }
-if(!defined(%compare_attr)) {
+if(! %compare_attr) {
 	%compare_attr = (
 		"${default_attr_type}" => "${default_cmp_attr}",
 	);
 }
 
-#print Dumper(%nodes);
-#print Dumper(%operands);
-
 # create c code file from specs
 
-my @obst_opvar;       # stack for the "ir_op *op_<arch>_<op-name> = NULL;" statements
-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 $obst_limit_func  = ""; #
+my $obst_reg_reqs    = ""; #
+my $obst_opvar       = ""; # buffer for the "ir_op *op_<arch>_<op-name> = NULL;" statements
+my $obst_get_opvar   = ""; # buffer for the get_op_<arch>_<op-name>() functions
+my $obst_constructor = ""; # buffer for node constructor functions
+my $obst_new_irop    = ""; # buffer for the new_ir_op calls
+my $obst_free_irop   = ""; # buffer for free_ir_op calls
+my $obst_enum_op     = ""; # buffer for creating the <arch>_opcode enum
+my $obst_header      = ""; # buffer for function prototypes
+my $obst_cmp_attr    = ""; # buffer for the compare attribute functions
+my $obst_proj        = ""; # buffer for the pn_ numbers
 my $orig_op;
 my $arity;
 my $cmp_attr_func;
@@ -96,13 +94,364 @@ my $temp;
 my $n_opcodes = 0;    # number of opcodes
 my $ARITY_VARIABLE = -1;
 my $ARITY_DYNAMIC  = -2;
+my %requirements = ();
+my %limit_bitsets = ();
+my %reg2class = ();
+my %regclass2len = ();
+
+# build register->class hashes
+foreach my $class_name (keys(%reg_classes)) {
+	my @class         = @{ $reg_classes{"$class_name"} };
+	my $old_classname = $class_name;
+
+	pop(@class);
+
+	$class_name = $arch."_".$class_name;
+
+	my $idx = 0;
+	foreach (@class) {
+		$reg2class{$_->{name}} = {
+			"class" => $old_classname,
+			"index" => $idx
+		};
+		$idx++;
+	}
+
+	$regclass2len{$old_classname} = $idx;
+}
+
+
+$obst_header .= "void ${arch}_create_opcodes(const arch_irn_ops_t *be_ops);\n";
+$obst_header .= "void ${arch}_free_opcodes(void);\n";
+
+sub create_constructor {
+	my $op   = shift;
+	my $name = shift;
+	my $n    = shift;
+	my $on   = shift;
+	my $known_mode;
+
+	my $suffix = "";
+	if ($name ne "") {
+		$suffix = "_${name}";
+	}
+
+	# determine mode
+	if (exists($n->{mode})) {
+		$known_mode = $n->{mode};
+	}
+
+	# determine arity
+	my $arity = 0;
+	if(exists($n->{"arity"})) {
+		$arity = $n->{"arity"};
+	} elsif (exists($n->{"reg_req"}) && exists($n->{"reg_req"}{"in"})) {
+		$arity = scalar(@{ $n->{"reg_req"}{"in"} });
+	} elsif (exists($n->{"ins"})) {
+		$arity = scalar(@{ $n->{"ins"} });
+	}
+	if($arity eq "variable") {
+		$arity = $ARITY_VARIABLE;
+	} elsif($arity eq "dynamic") {
+		$arity = $ARITY_DYNAMIC;
+	}
+
+	# determine out arity
+	my $out_arity = 0;
+	if(exists($n->{"out_arity"})) {
+		$out_arity = $n->{"out_arity"};
+	} elsif (exists($n->{"reg_req"}) && exists($n->{"reg_req"}{"out"})) {
+		$out_arity = scalar(@{ $n->{"reg_req"}{"out"} });
+	} elsif (exists($n->{"outs"})) {
+		$out_arity = scalar(@{ $n->{"outs"} });
+	}
+	if($out_arity eq "variable") {
+		$out_arity = $ARITY_VARIABLE;
+	} elsif($out_arity eq "dynamic") {
+		$out_arity = $ARITY_DYNAMIC;
+	}
+	if ($out_arity != 0 && $out_arity != 1 && !defined($known_mode)) {
+		$known_mode = "mode_T";
+	}
+
+	my $comment = $n->{"comment"};
+	if(!exists($n->{"comment"})) {
+		$comment = "construct ${orig_op} node";
+	}
+	$comment =
+		"/**\n".
+		" * ${comment}\n".
+		" */\n";
+
+	$obst_constructor .= $comment;
+
+	# create constructor head
+	my $complete_args = "";
+	$temp             = "";
+
+	$temp = "ir_node *new_bd_${arch}_${op}${suffix}(dbg_info *dbgi, ir_node *block";
+	if (!exists($n->{"args"})) { # default args
+		if ($arity == $ARITY_VARIABLE) {
+			$complete_args = ", int arity, ir_node *in[]";
+		} elsif ($arity == $ARITY_DYNAMIC) {
+			$complete_args = "";
+		} else {
+			for (my $i = 0; $i < $arity; $i++) {
+				my $opname = "op${i}";
+				if (exists($n->{"ins"})) {
+					my @ins = @{ $n->{"ins"} };
+					$opname = $ins[$i];
+				}
+
+				$complete_args .= ", ir_node *${opname}";
+			}
+		}
+		if ($out_arity == $ARITY_VARIABLE) {
+			$complete_args .= ", int n_res";
+		}
+
+		if (!defined($known_mode)) {
+			$complete_args .= ", ir_mode *mode";
+		}
+	} else { # user defined args
+		for my $href (@{ $n->{"args"} }) {
+			$href->{"type"} .= " " if ($href->{"type"} !~ / [*]?$/); # put a space between name and type if there is none at the end
+			$complete_args  .= ", ".$href->{"type"}.$href->{"name"};
+		}
+	}
+
+	# we have additional attribute arguements
+	if (exists($n->{"attr"})) {
+		$complete_args .= ", ".$n->{"attr"};
+	}
+
+	$temp .= "$complete_args)";
+	$obst_constructor .= "${temp}\n{\n";
+
+	$obst_header .= $comment;
+	$obst_header .= "${temp};\n";
+
+	# emit constructor code
+	$temp = <<EOF;
+	ir_graph         *irg        = get_irn_irg(block);
+	ir_op            *op         = op_${arch}_${op};
+	arch_irn_flags_t  irn_flags_ = arch_irn_flags_none;
+	ir_node          *res;
+	backend_info_t   *info;
+EOF
+
+	if($arity == $ARITY_DYNAMIC) {
+		$temp .= <<EOF;
+	int             arity   = -1;
+	ir_node       **in      = NULL;
+EOF
+	} elsif($arity == $ARITY_VARIABLE) {
+	} else {
+		$temp .= <<EOF;
+	int             arity   = $arity;
+EOF
+		if($arity > 0) {
+			$temp .= <<EOF;
+	ir_node        *in[$arity];
+EOF
+		} else {
+			$temp .= <<EOF;
+	ir_node       **in      = NULL;
+EOF
+		}
+	}
+	if($out_arity == $ARITY_DYNAMIC) {
+		$temp .= <<EOF;
+	int             n_res   = -1;
+EOF
+	} elsif($out_arity == $ARITY_VARIABLE) {
+	} else {
+		$temp .= <<EOF;
+	int             n_res   = ${out_arity};
+EOF
+	}
+
+	if (defined($known_mode)) {
+		$temp .= <<EOF;
+	ir_mode        *mode    = ${known_mode};
+EOF
+	}
+
+	undef my $in_req_var;
+	undef my $out_req_var;
+
+	my $set_out_reqs = "";
 
-# for registering additional opcodes
-$n_opcodes += $additional_opcodes if (defined($additional_opcodes));
+	# set up static variables for requirements and registers
+	if (exists($n->{"reg_req"})) {
+		my %req = %{ $n->{"reg_req"} };
+		my $idx;
 
-push(@obst_header, "void ".$arch."_create_opcodes(void);\n");
+		undef my @in;
+		@in = @{ $req{"in"} } if (exists($req{"in"}));
+		undef my @out;
+		@out = @{ $req{"out"} } if exists(($req{"out"}));
 
-push(@obst_enum_op, "typedef enum _$arch\_opcodes {\n");
+		for(my $idx = 0; $idx < $#in; $idx++) {
+			my $req = $in[$idx];
+			generate_requirements($req, $n, "${arch}_${op}", $idx, 1);
+		}
+		for(my $idx = 0; $idx < $#out; $idx++) {
+			my $req = $out[$idx];
+			generate_requirements($req, $n, "${arch}_${op}", $idx, 0);
+		}
+
+		if (@in) {
+			if($arity >= 0 && scalar(@in) != $arity) {
+				die "Fatal error: Arity and number of in requirements don't match for ${op}\n";
+			}
+
+			$temp .= "\tstatic const arch_register_req_t *in_reqs[] =\n";
+			$temp .= "\t{\n";
+			for ($idx = 0; $idx <= $#in; $idx++) {
+				my $req = $in[$idx];
+				my $reqstruct = generate_requirements($req, $n, "${arch}_${op}", $idx, 1);
+				$temp .= "\t\t& ${reqstruct},\n";
+			}
+			$temp .= "\t};\n";
+		} else {
+			if($arity > 0) {
+				die "Fatal error: need in requirements for ${op}\n";
+			}
+			$temp .= "\tstatic const arch_register_req_t **in_reqs = NULL;\n";
+		}
+
+		if (@out) {
+			if($out_arity >= 0 && scalar(@out) != $out_arity) {
+				die "Fatal error: Out-Arity and number of out requirements don't match for ${op}\n";
+			}
+
+			for ($idx = 0; $idx <= $#out; $idx++) {
+				my $req = $out[$idx];
+				my $reqstruct = generate_requirements($req, $n, "${arch}_${op}", $idx, 0);
+				$set_out_reqs .= <<EOF;
+	info->out_infos[${idx}].req = &${reqstruct};
+EOF
+			}
+		} else {
+			if($out_arity > 0) {
+				die "Fatal error: need out requirements for ${op}\n";
+			}
+		}
+	} else {
+		$temp .= "\tstatic const arch_register_req_t **in_reqs = NULL;\n";
+	}
+	my $attr_type = $on->{attr_type};
+	if(exists($n->{"init_attr"})) {
+		$temp .= "\t${attr_type} *attr;\n";
+	}
+
+	$temp .= "\n";
+
+	if($arity > 0) {
+		$temp .= "\t/* construct in array */\n";
+		for (my $i = 0; $i < $arity; $i++) {
+			my $opname = "op${i}";
+			if (exists($n->{"ins"})) {
+				my @ins = @{ $n->{"ins"} };
+				$opname = $ins[$i];
+			}
+
+			$temp .= "\tin[${i}] = ${opname};\n";
+		}
+		$temp .= "\n";
+	}
+
+	# set flags
+	if (exists($n->{"irn_flags"})) {
+		$temp .= "\t/* flags */\n";
+		my %known_irn_flags = (
+			"none"             => "arch_irn_flags_none",
+			"dont_spill"       => "arch_irn_flags_dont_spill",
+			"rematerializable" => "arch_irn_flags_rematerializable",
+			"modify_flags"     => "arch_irn_flags_modify_flags",
+			"simple_jump"      => "arch_irn_flags_simple_jump",
+			"not_scheduled"    => "arch_irn_flags_not_scheduled",
+		);
+		if (%custom_irn_flags) {
+			%known_irn_flags = (%known_irn_flags, %custom_irn_flags);
+		}
+		foreach my $flag (@{$n->{"irn_flags"}}) {
+			if (not defined($known_irn_flags{$flag})) {
+				print STDERR "WARNING: irn_flag '$flag' in opcode $op is unknown\n";
+			} else {
+				$temp .= "\tirn_flags_ |= " . $known_irn_flags{$flag} . ";\n";
+			}
+		}
+		$temp .= "\n";
+	}
+
+	# lookup init function
+	my $attr_init_code = "(void)in;(void)irn_flags_;(void)in_reqs;(void)n_res;";
+	if ($attr_type ne "") {
+		$attr_init_code = $init_attr{$attr_type};
+		if(!defined($attr_init_code)) {
+			die "Fatal error: Couldn't find attribute initialisation code for type '${attr_type}'";
+		}
+	}
+	my $custominit = "";
+	if(defined($custom_init_attr_func)) {
+		$custominit .= &$custom_init_attr_func($n, $on, "${arch}_${op}");
+	}
+	if(defined($n->{custominit})) {
+		$custominit .= $n->{custominit};
+	}
+
+	$temp .= <<EOF;
+	/* create node */
+	assert(op != NULL);
+	res = new_ir_node(dbgi, irg, block, op, mode, arity, in);
+
+	/* init node attributes */
+	${attr_init_code}
+	${custominit}
+	info = be_get_info(res);
+	(void) info; /* avoid potential warning */
+${set_out_reqs}
+
+EOF
+
+	if (exists($n->{"init_attr"})) {
+		$temp .= "\tattr = (${attr_type}*)get_irn_generic_attr(res);\n";
+		$temp .= "\t(void) attr; /* avoid potential warning */\n";
+		$temp .= "\t".$n->{"init_attr"}."\n";
+	}
+
+	$temp .= <<EOF;
+	/* optimize node */
+	res = optimize_node(res);
+	irn_verify_irg(res, irg);
+
+	return res;
+EOF
+
+	$obst_constructor .= $temp;
+
+	# close constructor function
+	$obst_constructor .= "}\n\n";
+}
+
+my @node_attrs = (
+	"args",
+	"arity",
+	"attr",
+	"comment",
+	"custominit",
+	"init_attr",
+	"ins",
+	"irn_flags",
+	"mode",
+	"out_arity",
+	"outs",
+	"reg_req",
+);
+
+$obst_enum_op .= "typedef enum ${arch}_opcodes {\n";
 foreach my $op (keys(%nodes)) {
 	my %n        = %{ $nodes{"$op"} };
 	my $known_mode;
@@ -148,63 +497,70 @@ foreach my $op (keys(%nodes)) {
 	if (exists($n{"outs"})) {
 		undef my @outs;
 
-		@outs     = @{ $n{"outs"} };
+		@outs = @{ $n{"outs"} };
 		if($out_arity >= 0 && scalar(@outs) != $out_arity) {
-			die "Op ${op} has different number of outs and out_arity\n";
+			die "Fatal error: Op ${op} has different number of outs and out_arity\n";
 		}
 
 		$num_outs = $#outs + 1;
 
-		push(@obst_proj, "\nenum pn_$op {\n");
+		if ($num_outs > 0) {
+			$obst_proj .= "\nenum pn_${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))*)//;
+			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))*)//;
+				}
+				$obst_proj .= "\tpn_${op}_".$outs[$idx]." = ${idx},\n";
 			}
-			push(@obst_proj, "\tpn_$op\_".$outs[$idx]." = $idx,\n");
-		}
 
-		push(@obst_proj, "};\n");
+			$obst_proj .= "};\n";
+		}
 		# outs have names, it must be a mode_T node
-		$known_mode = "mode_T";
+		if (!defined($n{mode})) {
+			$n{mode} = "mode_T";
+		}
 	}
 	if (exists($n{"ins"})) {
 		undef my @ins;
 
 		@ins = @{ $n{"ins"} };
 		if($arity >= 0 && scalar(@ins) != $arity) {
-			die "Op ${op} has different number of ins and arity\n";
+			die "Fatal error: Op ${op} has different number of ins and arity\n";
 		}
 
-		push(@obst_proj, "\nenum n_$op {\n");
-
-		for (my $idx = 0; $idx <= $#ins; $idx++) {
-			push(@obst_proj, "\tn_${op}_".$ins[$idx]." = $idx,\n");
+		if ($#ins >= 0) {
+			$obst_proj .= "\nenum n_$op {\n";
+			for (my $idx = 0; $idx <= $#ins; $idx++) {
+				$obst_proj .= "\tn_${op}_".$ins[$idx]." = ${idx},\n";
+			}
+			$obst_proj .= "};\n";
 		}
-
-		push(@obst_proj, "};\n");
-	}
-
-	# determine mode
-	if (exists($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_$arch\_irn_opcode(n) == iro_$op; }\n\n");
+	# Create opcode
+	$obst_opvar     .= "ir_op *op_$op = NULL;\n";
+	$obst_get_opvar .= "ir_op *get_op_$op(void)         { return op_$op; }\n";
+	$obst_get_opvar .= "int    is_$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");
+	$obst_header .= <<EOF;
+extern ir_op *op_${op};
+ir_op *get_op_${op}(void);
+int is_${op}(const ir_node *n);
+EOF
 
-	my $attr_type= $n{"attr_type"};
+	my $attr_type= $n{attr_type};
 	if(!defined($attr_type)) {
 		$attr_type = $default_attr_type;
+		$n{attr_type} = $attr_type;
+	}
+
+	# determine hash function
+	my $hash_func;
+	if (exists($n{"hash_func"})) {
+		$hash_func = $n{"hash_func"};
 	}
 
 	# determine compare function
@@ -212,318 +568,138 @@ foreach my $op (keys(%nodes)) {
 	if (exists($n{"cmp_attr"})) {
 		my $cmpcode = $n{"cmp_attr"};
 
-		push(@obst_cmp_attr, "static int cmp_attr_$op(ir_node *a, ir_node *b) {\n");
+		$obst_cmp_attr .= "static int cmp_attr_$op(const ir_node *a, const ir_node *b) {\n";
 		if($cmpcode =~ m/attr_a/) {
-			push(@obst_cmp_attr, "\t${attr_type} *attr_a = get_irn_generic_attr(a);\n");
+			$obst_cmp_attr .= "\tconst ${attr_type} *attr_a = get_irn_generic_attr_const(a);\n";
+		} else {
+			$obst_cmp_attr .= "\t(void) a;\n";
 		}
 		if($cmpcode =~ m/attr_b/) {
-			push(@obst_cmp_attr, "\t${attr_type} *attr_b = get_irn_generic_attr(b);\n");
+			$obst_cmp_attr .= "\tconst ${attr_type} *attr_b = get_irn_generic_attr_const(b);\n";
+		} else {
+			$obst_cmp_attr .= "\t(void) b;\n";
 		}
-		push(@obst_cmp_attr, "\t${cmpcode}\n");
-		push(@obst_cmp_attr, "}\n\n");
+		$obst_cmp_attr .= "\t${cmpcode}\n";
+		$obst_cmp_attr .= "}\n\n";
 
 		$cmp_attr_func = "cmp_attr_${op}";
+	} elsif ($attr_type eq "") {
+		$cmp_attr_func = "NULL";
 	} else {
 		if(defined($compare_attr{${attr_type}})) {
 			$cmp_attr_func = $compare_attr{${attr_type}};
 		} else {
-			die "No compare function defined for ${attr_type} attributes.";
+			die "Fatal error: No compare function defined for ${attr_type} attributes.";
 		}
 	}
 
-	if (exists($n{"rd_constructor"}) && $n{"rd_constructor"} =~ /^NONE$/i) {
-		# we explicitly skip the constructor if the specification entry says NONE
+	my %constructors;
+	if (exists($n{constructors})) {
+		%constructors = %{ $n{constructors} };
 	} else {
-		my $comment = $n{"comment"};
-		if(!exists($n{"comment"})) {
-			$comment = "construct ${orig_op} node";
-		}
-		$comment =
-			"/**\n".
-			" * ${comment}\n".
-			" */\n";
-
-		push(@obst_constructor, $comment);
-
-		# create constructor head
-		my $complete_args = "";
-		$temp             = "";
-
-		$temp = "ir_node *new_rd_$op(dbg_info *db, ir_graph *irg, ir_node *block";
-		if (!exists($n{"args"})) { # default args
-			if ($arity == $ARITY_VARIABLE) {
-				$complete_args = ", int arity, ir_node *in[]";
-			} elsif ($arity == $ARITY_DYNAMIC) {
-				$complete_args = "";
-			} else {
-				for (my $i = 0; $i < $arity; $i++) {
-					my $opname = "op${i}";
-					if (exists($n{"ins"})) {
-						my @ins = @{ $n{"ins"} };
-						$opname = $ins[$i];
-					}
-
-					$complete_args .= ", ir_node *${opname}";
-				}
-			}
-			if ($out_arity == $ARITY_VARIABLE) {
-				$complete_args .= ", int n_res";
+		# Create 1 default constructor
+		my %constructor = ();
+		foreach my $a (@node_attrs) {
+			if (defined($n{$a})) {
+				$constructor{$a} = $n{$a};
 			}
-
-			if (!defined($known_mode)) {
-				$complete_args .= ", ir_mode *mode";
-			}
-		} else { # user defined args
-			for my $href (@{ $n{"args"} }) {
-				$href->{"type"} .= " " if ($href->{"type"} !~ / [*]?$/); # put a space between name and type if there is none at the end
-				$complete_args  .= ", ".$href->{"type"}.$href->{"name"};
-			}
-		}
-
-		# we have additional attribute arguements
-		if (exists($n{"attr"})) {
-			$complete_args .= ", ".$n{"attr"};
 		}
+		%constructors = ( "" => \%constructor );
+	}
 
-		$temp .= "$complete_args)";
-		push(@obst_constructor, $temp."\n{\n");
-		push(@obst_header, $comment);
-		push(@obst_header, $temp.";\n");
-
-		# emit constructor code
-		if (!exists($n{"rd_constructor"})) { # default constructor
-			$temp  = "\tir_node  *res;\n";
-			$temp .= "\tir_op    *op      = op_${op};\n";
-			$temp .= "\tint       flags   = 0;\n";
-
-			if($arity == $ARITY_DYNAMIC) {
-				$temp .= "\tint        arity   = -1;\n";
-				$temp .= "\tir_node  **in      = NULL;\n";
-			} elsif($arity == $ARITY_VARIABLE) {
-			} else {
-				$temp .= "\tint       arity   = $arity;\n";
-				if($arity > 0) {
-					$temp .= "\tir_node  *in[$arity];\n";
-				} else {
-					$temp .= "\tir_node **in    = NULL;\n";
-				}
-			}
-			if($out_arity == $ARITY_DYNAMIC) {
-				$temp .= "\tint       n_res   = -1;\n";
-			} elsif($out_arity == $ARITY_VARIABLE) {
-			} else {
-				$temp .= "\tint       n_res   = ${out_arity};\n";
-			}
-
-			my $latency = $n{"latency"};
-			if (!defined($latency)) {
-				$latency = 1;
-			}
-			$temp .= "\tunsigned  latency = ${latency};\n";
-
-			if (defined($known_mode)) {
-				$temp .= "\tir_mode  *mode    = ${known_mode};\n";
-			}
-
-			# set up static variables for cpu execution unit assigments
-			if (exists($n{"units"})) {
-				$temp .= gen_execunit_list_initializer($n{"units"});
-			} else {
-				$temp .= "\tstatic const be_execution_unit_t ***exec_units = NULL;\n";
-			}
-
-			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;
-
-				undef my @in;
-				@in = @{ $req{"in"} } if (exists($req{"in"}));
-				undef my @out;
-				@out = @{ $req{"out"} } if exists(($req{"out"}));
-
-				if (@in) {
-					if($arity >= 0 && scalar(@in) != $arity) {
-						die "Arity and number of in requirements don't match for ${op}\n";
-					}
-
-					$temp .= "\tstatic const arch_register_req_t *in_reqs[] =\n";
-					$temp .= "\t{\n";
-					for ($idx = 0; $idx <= $#in; $idx++) {
-						$temp .= "\t\t&".$op."_reg_req_in_".$idx.",\n";
-					}
-					$temp .= "\t};\n";
-				} else {
-					if($arity > 0) {
-						die "need in requirements for ${op}\n";
-					}
-					$temp .= "\tstatic const arch_register_req_t **in_reqs = NULL;\n";
-				}
-
-				if (@out) {
-					if($out_arity >= 0 && scalar(@out) != $out_arity) {
-						die "Out-Arity and number of out requirements don't match for ${op}\n";
-					}
-
-					$temp .= "\tstatic const arch_register_req_t *out_reqs[] =\n";
-					$temp .= "\t{\n";
-					for ($idx = 0; $idx <= $#out; $idx++) {
-						$temp .= "\t\t&".$op."_reg_req_out_".$idx.",\n";
-					}
-					$temp .= "\t};\n";
-				} else {
-					if($out_arity > 0) {
-						die "need out requirements for ${op}\n";
-					}
-					$temp .= "\tstatic const arch_register_req_t **out_reqs = NULL;\n";
-				}
-			} else {
-				$temp .= "\tstatic const arch_register_req_t **in_reqs = NULL;\n";
-				$temp .= "\tstatic const arch_register_req_t **out_reqs = NULL;\n";
-			}
-			if(exists($n{"init_attr"})) {
-				$temp .= "\t${attr_type} *attr;\n";
-			}
-
-			$temp .= "\n";
-
-			if($arity > 0) {
-				$temp .= "\t/* construct in array */\n";
-				for (my $i = 0; $i < $arity; $i++) {
-					my $opname = "op${i}";
-					if (exists($n{"ins"})) {
-						my @ins = @{ $n{"ins"} };
-						$opname = $ins[$i];
-					}
-
-					$temp .= "\tin[${i}] = ${opname};\n";
-				}
-				$temp .= "\n";
-			}
-
-			# set flags
-			if (exists($n{"irn_flags"})) {
-				$temp .= "\t/* flags */\n";
-				foreach my $flag (split(/\|/, $n{"irn_flags"})) {
-					if ($flag eq "R") {
-						$temp .= "\tflags |= arch_irn_flags_rematerializable;\n";
-					} elsif ($flag eq "N") {
-						$temp .= "\tflags |= arch_irn_flags_dont_spill;\n";
-					} elsif ($flag eq "I") {
-						$temp .= "\tflags |= arch_irn_flags_ignore;\n";
-					} elsif ($flag eq "S") {
-						$temp .= "\tflags |= arch_irn_flags_modify_sp;\n";
-					}
-				}
-				$temp .= "\n";
-			}
-
-			$temp .= "\t/* create node */\n";
-			$temp .= "\tassert(op != NULL);\n";
-			$temp .= "\tres = new_ir_node(db, irg, block, op, mode, arity, in);\n";
-			$temp .= "\n";
-
-			$temp .= "\t/* init node attributes */\n";
-			# lookup init function
-			my $attr_init_code = $init_attr{$attr_type};
-			if(!defined($attr_init_code)) {
-				die "Couldn't find attribute initialisation code for type '${attr_type}'";
-			}
-			$temp .= "${attr_init_code}\n";
-			$temp .= "\n";
-
-			# set flags for outs
-			if ($#out_flags >= 0) {
-				$temp .= "\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";
-				}
-				$temp .= "\n";
-			}
-
-
-			if (exists($n{"init_attr"})) {
-				$temp .= "\tattr = get_irn_generic_attr(res);\n";
-				$temp .= "\t".$n{"init_attr"}."\n";
+	foreach my $constr (keys(%constructors)) {
+		my %cstr = %{ $constructors{$constr} };
+		# Copy some values from outer node if they don't exists in the constr
+		foreach my $a (@node_attrs) {
+			if (!defined($cstr{$a}) && defined($n{$a})) {
+				$cstr{$a} = $n{$a};
 			}
-
-			$temp .= "\t/* optimize node */\n";
-			$temp .= "\tres = optimize_node(res);\n";
-			$temp .= "\tirn_vrfy_irg(res, irg);\n";
-			$temp .= "\n";
-
-			$temp .= "\treturn res;\n";
-
-			push(@obst_constructor, $temp);
-		}
-		else { # user defined constructor
-			push(@obst_constructor, $n{"rd_constructor"});
 		}
-
-		# close constructor function
-		push(@obst_constructor, "}\n\n");
-	} # constructor creation
+		create_constructor($orig_op, $constr, \%cstr, \%n);
+	}
 
 	# set default values for state and flags if not given
-	$n{"state"}    = "floats" if (! exists($n{"state"}));
-	$n{"op_flags"} = "N"      if (! exists($n{"op_flags"}));
-
+	$n{"state"}     = "floats" if (! exists($n{"state"}));
+	$n{"op_flags"}  = ["none"] if (! exists($n{"op_flags"}));
+	$n{"dump_func"} = "${arch}_dump_node" if (!exists($n{"dump_func"}));
+	my $dump_func = $n{"dump_func"};
+
+	my %known_flags = map { $_ => 1 } (
+		"none", "commutative", "cfopcode", "unknown_jump", "fragile",
+		"forking", "highlevel", "constlike", "keep", "start_block",
+		"uses_memory", "dump_noblock", "cse_neutral"
+	);
+	my $is_fragile = 0;
+	foreach my $flag (@{$n{"op_flags"}}) {
+		if (not defined($known_flags{$flag})) {
+			print STDERR "WARNING: Flag '$flag' in opcode $op is unknown\n";
+		}
+		if ($flag eq "fragile") {
+			$is_fragile = 1;
+		}
+	}
+	my @mapped = map { "irop_flag_$_" } @{$n{"op_flags"}};
+	my $op_flags = join('|', @mapped);
 
-	push(@obst_new_irop, "\n\tmemset(&ops, 0, sizeof(ops));\n");
-	push(@obst_new_irop, "\tops.dump_node     = $arch\_dump_node;\n");
+	my $attr_size = "0";
+	if ($attr_type ne "") {
+		$attr_size = "sizeof(${attr_type})"
+	}
 
+	$n_opcodes++;
+	$temp  = "\top = new_ir_op(cur_opcode + iro_$op, \"$op\", op_pin_state_".$n{"state"}.", $op_flags";
+	$temp .= ", ".translate_arity($arity).", 0, ${attr_size});\n";
+	$obst_new_irop .= $temp;
+	$obst_new_irop .= "\top->ops.be_ops        = be_ops;\n";
+	$obst_new_irop .= "\top->ops.dump_node     = ${dump_func};\n";
 	if (defined($cmp_attr_func)) {
-		push(@obst_new_irop, "\tops.node_cmp_attr = ${cmp_attr_func};\n");
+		$obst_new_irop .= "\top->ops.node_cmp_attr = ${cmp_attr_func};\n";
+	}
+	my $copy_attr_func = $copy_attr{$attr_type};
+	if (!defined($copy_attr_func)) {
+		# don't set a copy_attr function if the node has no additional attributes.
+		if ($attr_type ne "") {
+			$copy_attr_func = $default_copy_attr;
+		}
+	}
+	if (defined($copy_attr_func)) {
+		$obst_new_irop .= "\top->ops.copy_attr     = ${copy_attr_func};\n";
+	}
+	if (defined($hash_func)) {
+		$obst_new_irop .= "\top->ops.hash          = ${hash_func};\n";
 	}
 
-	$n_opcodes++;
-	my $n_res = $out_arity;
-	if($n_res < 0) {
-		$n_res = "20"; # hacky....
+	if ($is_fragile) {
+		$obst_new_irop .= "\tir_op_set_memory_index(op, n_${op}_mem);\n";
+		$obst_new_irop .= "\tir_op_set_fragile_indices(op, pn_${op}_X_regular, pn_${op}_X_except);\n";
+	}
+	$obst_new_irop .= "\tset_op_tag(op, $arch\_op_tag);\n";
+	if(defined($n{op_attr_init})) {
+		$obst_new_irop .= "\t".$n{op_attr_init}."\n";
 	}
-	$temp  = "\top_$op = new_ir_op(cur_opcode + iro_$op, \"$op\", op_pin_state_".$n{"state"}.", ".$n{"op_flags"};
-	$temp .= "|M, ".translate_arity($arity).", 0, sizeof(${attr_type}), &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");
+	$obst_new_irop .= "\top_${op} = op;\n";
+
+	$obst_free_irop .= "\tfree_ir_op(op_$op); op_$op = NULL;\n";
+
+	$obst_enum_op .= "\tiro_$op,\n";
 
-	push(@obst_header, "\n");
+	$obst_header .= "\n";
 }
-push(@obst_enum_op, "\tiro_$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} $arch\_opcodes;\n\n");
+$obst_enum_op .= "\tiro_$arch\_last\n";
+$obst_enum_op .= "} $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";
+open(OUT, ">$target_c") || die("Fatal error: Could not open $target_c, reason: $!\n");
 
 print OUT<<EOF;
+#include "gen_$arch\_regalloc_if.h"
+#include "irverify_t.h"
+#include "fourcc.h"
+
+$obst_cmp_attr
+$obst_opvar
+$obst_get_opvar
 
 static int $arch\_opcode_start = -1;
 static int $arch\_opcode_end   = -1;
@@ -550,10 +726,10 @@ if (length($arch) >= 4) {
 	$d = uc(substr($arch, 3, 1));
 }
 
-print OUT<<ENDOFISIRN;
+print OUT <<END;
 
 /** A tag for the $arch opcodes. Note that the address is used as a tag value, NOT the FOURCC code. */
-static unsigned $arch\_op_tag = FOURCC('$a', '$b', '$c', '$d');
+#define $arch\_op_tag FOURCC('$a', '$b', '$c', '$d')
 
 /** Return the opcode number of the first $arch opcode. */
 int get_$arch\_opcode_first(void) {
@@ -567,7 +743,7 @@ int get_$arch\_opcode_last(void) {
 
 /** Return 1 if the given opcode is a $arch machine op, 0 otherwise */
 int is_$arch\_op(const ir_op *op) {
-	return get_op_tag(op) == &$arch\_op_tag;
+	return get_op_tag(op) == $arch\_op_tag;
 }
 
 /** Return 1 if the given node is a $arch machine node, 0 otherwise */
@@ -581,54 +757,38 @@ int get_$arch\_irn_opcode(const ir_node *node) {
 	return -1;
 }
 
-ENDOFISIRN
+#ifdef BIT
+#undef BIT
+#endif
+#define BIT(x)  (1 << (x))
 
-print OUT @obst_constructor;
+$obst_limit_func
+$obst_reg_reqs
+$obst_constructor
 
-print OUT<<ENDOFMAIN;
 /**
  * Creates the $arch specific Firm machine operations
  * needed for the assembler irgs.
  */
-void $arch\_create_opcodes(void) {
-#define N   irop_flag_none
-#define L   irop_flag_labeled
-#define C   irop_flag_commutative
-#define X   irop_flag_cfopcode
-#define I   irop_flag_ip_cfopcode
-#define F   irop_flag_fragile
-#define Y   irop_flag_forking
-#define H   irop_flag_highlevel
-#define c   irop_flag_constlike
-#define K   irop_flag_keep
-#define M   irop_flag_machine
-#define O   irop_flag_machine_op
-#define R   (irop_flag_user << 0)
-
-	ir_op_ops  ops;
-	int        cur_opcode;
-	static int run_once = 0;
-
-	if (run_once)
-		return;
-	run_once = 1;
-
-	cur_opcode = get_next_ir_opcodes(iro_$arch\_last);
+void $arch\_create_opcodes(const arch_irn_ops_t *be_ops)
+{
+	ir_op *op;
+	int    cur_opcode = get_next_ir_opcodes(iro_$arch\_last);
 
 	$arch\_opcode_start = cur_opcode;
-ENDOFMAIN
+$obst_new_irop
+	$arch\_opcode_end = cur_opcode + iro_$arch\_last;
+}
 
-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";
+void $arch\_free_opcodes(void)
+{
+$obst_free_irop
+}
+END
 
 close(OUT);
 
-open(OUT, ">$target_h") || die("Could not open $target_h, reason: $!\n");
+open(OUT, ">$target_h") || die("Fatal error: Could not open $target_h, reason: $!\n");
 
 my $creation_time = localtime(time());
 my $tmp = uc($arch);
@@ -645,17 +805,16 @@ print OUT<<EOF;
 #ifndef FIRM_BE_${tmp}_GEN_${tmp}_NEW_NODES_H
 #define FIRM_BE_${tmp}_GEN_${tmp}_NEW_NODES_H
 
-EOF
+$obst_enum_op
+int is_${arch}_irn(const ir_node *node);
+int is_${arch}_op(const ir_op *op);
 
-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;
+int get_${arch}_opcode_first(void);
+int get_${arch}_opcode_last(void);
+int get_${arch}_irn_opcode(const ir_node *node);
+${obst_header}
+${obst_proj}
 
-print OUT <<EOF;
 #endif
 EOF
 
@@ -688,74 +847,381 @@ sub translate_arity {
 	} elsif ($arity == $ARITY_DYNAMIC) {
 		return "oparity_dynamic";
 	} else {
-		die "Unknown arity $arity";
+		die "Fatal error: Unknown arity $arity";
+	}
+}
+
+sub mangle_requirements {
+	my $reqs  = shift;
+	my $class = shift;
+	my $flags = shift;
+
+	my @alternatives = split(/ /, $reqs);
+	for(my $idx = 0; $idx < scalar(@alternatives); $idx++) {
+		$alternatives[$idx] =~ s/!/not_/g;
 	}
+
+	@alternatives = sort @alternatives;
+
+	my $name = $class."_".join('_', @alternatives);
+	if (defined($flags)) {
+		$flags =~ s/\|/_/g;
+		$name .= "_$flags";
+	}
+
+	return $name;
 }
 
 ###
-# Return the list of pointers for the given execution units.
+# Determines whether $name is a specified register class or not.
+# @return 1 if name is register class, 0 otherwise
 ###
-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."]");
+sub is_reg_class {
+    my $name = shift;
+    return 1 if exists($reg_classes{"$name"});
+    return 0;
+}
+
+###
+# Returns the register class for a given register.
+# @return class or undef
+###
+sub get_reg_class {
+    my $reg = shift;
+    $reg = substr($reg, 1) if ($reg =~ /!.*/);
+    return $reg2class{"$reg"}{"class"} if (exists($reg2class{"$reg"}));
+    return undef;
+}
+
+###
+# Returns the index of a given register within its register class.
+# @return index or undef
+###
+sub get_reg_index {
+    my $reg = shift;
+    return $reg2class{"$reg"}{"index"} if (exists($reg2class{"$reg"}));
+    return undef;
+}
+
+###
+# Remember the register class for each index in the given requirements.
+# We need this information for requirements like "in_sX" or "out_dX"
+# @return array of classes corresponding to the requirement for each index
+###
+sub build_inout_idx_class {
+	my $n     = shift;
+	my $op    = shift;
+	my $is_in = shift;
+	my @idx_class;
+
+	my $inout = ($is_in ? "in" : "out");
+
+	if (exists($n->{"reg_req"}{"$inout"})) {
+		my @reqs = @{ $n->{"reg_req"}{"$inout"} };
+
+		for (my $idx = 0; $idx <= $#reqs; $idx++) {
+			my $class = undef;
+			my ($req,) = split(/:/, $reqs[$idx]);
+
+			if ($req eq "none") {
+				$class = "none";
+			} elsif (is_reg_class($req)) {
+				$class = $req;
+			} else {
+				my @regs = split(/ /, $req);
+GET_CLASS:		foreach my $reg (@regs) {
+					if ($reg =~ /!?(in|out)\_r\d+/ || $reg =~ /!in/) {
+						$class = "UNKNOWN_CLASS";
+					} else {
+						$class = get_reg_class($reg);
+						if (!defined $class) {
+							die("Fatal error: Could not get ".uc($inout)." register class for '$op' pos $idx (reg $reg) ... exiting.\n");
+						} else {
+							last GET_CLASS;
+						} # !defined class
+					} # if (reg =~ ...
+				} # foreach
+			} # if
+
+			push(@idx_class, $class);
+		} # for
+	} # if
+
+	return @idx_class;
+}
+
+###
+# Generates the function for a given $op and a given IN-index
+# which returns a subset of possible register from a register class
+# @return classname from which the subset is derived or undef and
+#         pos which corresponds to in/out reference position or undef
+###
+sub build_subset_class_func {
+	my $neg           = undef;
+	my $class         = undef;
+	my $has_limit     = 0;
+	my $limit_name;
+	my $same_pos      = 0;
+	my $different_pos = 0;
+	my $temp;
+	my @obst_init;
+	my @obst_limits;
+	my @obst_ignore;
+	my @limit_array;
+	my $limit_reqs;   #used for name mangling
+
+	# build function header
+	my $node  = shift;
+	my $op    = shift;
+	my $idx   = shift;
+	my $is_in = shift;
+	my @regs  = split(/ /, shift);
+	my $flags = shift;
+
+	my @idx_class = build_inout_idx_class($node, $op, !$is_in);
+
+	# set/unset registers
+CHECK_REQS: foreach (@regs) {
+		if (!$is_in && /(!)?in_r(\d+)/) {
+			my $bit_pos = 1 << ($2 - 1);
+			if ($different_pos & $bit_pos) {
+				if ($1) {
+					print STDERR "duplicate !in constraint\n";
+				} else {
+					print STDERR "conflicting !in and in constraints\n";
+				}
+				return (undef, undef, undef, undef);
+			}
+
+			if ($same_pos & $bit_pos) {
+				if ($1) {
+					print STDERR "conflicting !in and in constraints\n";
+				} else {
+					print STDERR "duplicate in constraint\n";
+				}
+				return (undef, undef, undef, undef);
+			}
+
+			if ($1) {
+				$different_pos |= $bit_pos;
+			} else {
+				$same_pos      |= $bit_pos;
 			}
+
+			$class = $idx_class[$2 - 1];
+			next CHECK_REQS;
 		}
-		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."]");
-						$found = 1;
-						last TP_SEARCH;
-					}
+
+		# check for negate
+		if (substr($_, 0, 1) eq "!") {
+			if (defined($neg) && $neg == 0) {
+				# we have seen a positiv constraint as first one but this one is negative
+				# this doesn't make sense
+				print STDERR "Mixed positive and negative constraints for the same slot are not allowed.\n";
+				return (undef, undef, undef, undef);
+			}
+
+			if (!defined($neg)) {
+				$has_limit = 1;
+			}
+
+			$_   = substr($_, 1); # skip '!'
+			$neg = 1;
+		} else {
+			if (defined($neg) && $neg == 1) {
+				# we have seen a negative constraint as first one but this one is positive
+				# this doesn't make sense
+				print STDERR "Mixed positive and negative constraints for the same slot are not allowed.\n";
+				return (undef, undef, undef, undef);
+			}
+
+			$has_limit = 1;
+			$neg = 0;
+		}
+
+		# check if register belongs to one of the given classes
+		$temp = get_reg_class($_);
+		if (!defined($temp)) {
+			print STDERR "Unknown register '$_'!\n";
+			return (undef, undef, undef, undef);
+		}
+
+		# set class
+		if (!defined($class)) {
+			$class = $temp;
+		} elsif ($class ne $temp) {
+			# all registers must belong to the same class
+			print STDERR "Registerclass mismatch. '$_' is not member of class '$class'.\n";
+			return (undef, undef, undef, undef);
+		}
+
+		# calculate position inside the initializer bitfield (only 32 bits per
+		# element)
+		my $regidx = get_reg_index($_);
+		my $arrayp = $regidx / 32;
+		push(@{$limit_array[$arrayp]}, $_);
+		$limit_reqs .= "$_ ";
+	}
+
+	# don't allow ignore regs in negative constraints
+	if($neg) {
+		my @cur_class = @{ $reg_classes{"$class"} };
+		for (my $idx = 0; $idx <= $#cur_class; $idx++) {
+			if (defined($cur_class[$idx]{"type"}) && ($cur_class[$idx]{"type"} & 4)) {
+				my $reg    = $cur_class[$idx]{"name"};
+				my $regix  = get_reg_index($reg);
+				my $arrayp = $regix / 32;
+				push(@{$limit_array[$arrayp]}, $reg);
+				$limit_reqs .= "$reg ";
+			}
+		}
+	}
+
+	if ($has_limit == 1) {
+		$limit_name = "${arch}_limit_".mangle_requirements($limit_reqs, $class);
+
+		if(defined($limit_bitsets{$limit_name})) {
+			$limit_name = $limit_bitsets{$limit_name};
+			return ($class, $limit_name, $same_pos, $different_pos);
+		}
+
+		$limit_bitsets{$limit_name} = $limit_name;
+
+		$obst_limit_func .= "static const unsigned $limit_name\[] = { ";
+		my $first = 1;
+		my $limitbitsetlen = $regclass2len{$class};
+		my $limitarraylen = ($limitbitsetlen+31) / 32;
+		for(my $i = 0; $i < $limitarraylen; $i++) {
+
+			my $limitarraypart = $limit_array[$i];
+			if($first) {
+				$first = 0;
+			} else {
+				$obst_limit_func .= ", ";
+			}
+			my $temp;
+			if($neg) {
+				$temp = "0xFFFFFFFF";
+			}
+			foreach my $reg (@{$limitarraypart}) {
+				if($neg) {
+					$temp .= " & ~";
+				} elsif(defined($temp)) {
+					$temp .= " | ";
 				}
+				my $firstreg = uc($reg_classes{$class}[0]->{"name"});
+				my $classuc = uc($class);
+				my $reguc = uc($reg);
+				$temp .= "BIT(REG_${classuc}_${reguc})";
 			}
+			$obst_limit_func .= $temp || "0";
+		}
+		$obst_limit_func .= " };\n";
+	}
 
-			if (! $found) {
-				print STDERR "Invalid execution unit $unit specified!\n";
+	return ($class, $limit_name, $same_pos, $different_pos);
+}
+
+###
+# Generate register requirements structure
+###
+sub generate_requirements {
+	my ($reqs, $flags) = split(/:/, shift);
+	my $node  = shift;
+	my $op    = shift;
+	my $idx   = shift;
+	my $is_in = shift;
+	my $class = "";
+	my $width = 1;
+	my $result;
+
+	my @req_type_mask;
+	if (defined($flags)) {
+		foreach my $f (split(/|/, $flags)) {
+			if ($f eq "I") {
+				push(@req_type_mask, "arch_register_req_type_ignore");
+			} elsif ($f eq "S") {
+				push(@req_type_mask, "arch_register_req_type_produces_sp");
+			} elsif ($f eq "a") {
+				push(@req_type_mask, "arch_register_req_type_aligned");
+			} elsif ($f eq "2" or $f eq "4" or $f eq "8") {
+				$width = int($f);
 			}
 		}
 	}
 
-	# 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";
+	if ($reqs eq "none") {
+
+		$result = <<EOF;
+{
+	arch_register_req_type_none,
+	NULL,                         /* regclass */
+	NULL,                         /* limit bitset */
+	0,                            /* same pos */
+	0,                            /* different pos */
+	0                             /* width */
+};
+
+EOF
+	} elsif (is_reg_class($reqs)) {
+		push(@req_type_mask, "arch_register_req_type_normal");
+		my $reqtype = join(" | ", @req_type_mask);
+		$class  = $reqs;
+		$result = <<EOF;
+{
+	${reqtype},
+	& ${arch}_reg_classes[CLASS_${arch}_${class}],
+	NULL,        /* limit bitset */
+	0,           /* same pos */
+	0,           /* different pos */
+	$width            /* width */
+};
+
+EOF
+
+	} else {
+		my ($regclass, $limit_bitset, $same_pos, $different_pos)
+			= build_subset_class_func($node, $op, $idx, $is_in, $reqs, $flags);
+
+		if (!defined($regclass)) {
+			die("Fatal error: Could not build subset for requirements '$reqs' of '$op' pos $idx ... exiting.\n");
+		}
+
+		if (defined($limit_bitset) && $limit_bitset ne "NULL") {
+			push(@req_type_mask, "arch_register_req_type_limited");
+		}
+		if ($same_pos != 0) {
+			push(@req_type_mask, "arch_register_req_type_should_be_same");
+		}
+		if ($different_pos != 0) {
+			push(@req_type_mask, "arch_register_req_type_must_be_different");
+		}
+		my $reqtype = join(" | ", @req_type_mask);
+
+ 		if(!defined($limit_bitset)) {
+			$limit_bitset = "NULL";
 		}
-		$ret .= "\t\tNULL\n";
-		$ret .= "\t};\n";
-		$ret2 .= "\t\tallowed_units_$key,\n";
+
+		$class  = $regclass;
+		$result = <<EOF;
+{
+	${reqtype},
+	& ${arch}_reg_classes[CLASS_${arch}_${class}],
+	${limit_bitset},
+	${same_pos},        /* same pos */
+	${different_pos},       /* different pos */
+	$width             /* width */
+};
+
+EOF
 	}
-	$ret2 .= "\t\tNULL\n";
 
-	$ret .= "\tstatic const be_execution_unit_t **exec_units[] =\n";
-	$ret .= "\t{\n";
-	$ret .= $ret2;
-	$ret .= "\t};\n";
+	my $name = "${arch}_requirements_".mangle_requirements($reqs, $class, $flags);
+	if(defined($requirements{$name})) {
+		return $name;
+	}
+	$requirements{$name} = $name;
+	$obst_reg_reqs .= "static const arch_register_req_t ${name} = ${result}\n";
 
-	return $ret;
+	return $name;
 }