X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fscripts%2Fgenerate_regalloc_if.pl;h=0f310b36e26f9f37ca542263a7fb4f528680e48f;hb=b3846b62b473eae163a25127f7bd361d24e0c871;hp=b4ab2d5b342453714ab5312bd46637725cb46336;hpb=0f0b70bee67238a0226380ddce061cfe50e6c8fc;p=libfirm diff --git a/ir/be/scripts/generate_regalloc_if.pl b/ir/be/scripts/generate_regalloc_if.pl index b4ab2d5b3..0f310b36e 100755 --- a/ir/be/scripts/generate_regalloc_if.pl +++ b/ir/be/scripts/generate_regalloc_if.pl @@ -22,155 +22,242 @@ 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; + warn "couldn't parse $specfile: $@" if $@; + warn "couldn't do $specfile: $!" unless defined $return; + warn "couldn't run $specfile" unless $return; } use strict "subs"; -my $target_c = $target_dir."/gen_".$arch."_regalloc_if.c.inl"; -my $target_h = $target_dir."/gen_".$arch."_regalloc_if.h"; +my $target_c = $target_dir."/gen_".$arch."_regalloc_if.c"; +my $target_h = $target_dir."/gen_".$arch."_regalloc_if.h"; +my $target_h_t = $target_dir."/gen_".$arch."_regalloc_if_t.h"; # helper function -my @rt = ("arch_register_type_none", - "arch_register_type_write_invariant", - "arch_register_type_caller_saved", - "arch_register_type_callee_saved", - "arch_register_type_ignore"); +sub translate_reg_type { + my $t = shift; + + if ($t == 0) { + return "arch_register_type_none"; + } + else { + my @types; + + if ($t & 1) { + push(@types, "arch_register_type_caller_save"); + } + + if ($t & 2) { + push(@types, "arch_register_type_callee_save"); + } + + if ($t & 4) { + push(@types, "arch_register_type_ignore"); + } + + if ($t & 8) { + push(@types, "arch_register_type_joker"); + } + + return join(" | ", @types); + } +} # stacks for output -my @obst_regtypes; # stack for the register type variables +my @obst_regtypes_def; # stack for the register type variables definitions +my @obst_regtypes_decl;# stack for the register type variables declarations my @obst_regclasses; # stack for the register class variables -my @obst_classdef; # stack to assign a number to a certain class +my @obst_classdef; # stack to define a name for a class index +my @obst_regdef; # stack to define a name for a register index my @obst_reginit; # stack for the register type inits my @obst_req; # stack for the register requirements my @obst_limit_func; # stack for functions to return a subset of a register class +my @obst_defreq_head; # stack for prototypes of default requirement function +my @obst_header_all; # stack for some extern struct defs needed for bearch_$arch include +my @obst_requirement_def; # stack for requirement name defines my $numregs; +my $class_ptr; my $class_idx = 0; +my $tmp; + my %reg2class; -# generate register type and class variable and init function +# there is a default NONE requirement +$tmp = "/* Default NONE register requirements */\n"; +$tmp .= "const $arch\_register_req_t $arch\_default_req_none = {\n"; +$tmp .= " {\n"; +$tmp .= " arch_register_req_type_none, /* register type */\n"; +$tmp .= " NULL, /* register class */\n"; +$tmp .= " NULL, /* limit function */\n"; +$tmp .= " NULL, /* limit environment */\n"; +$tmp .= " NULL, /* node for same */\n"; +$tmp .= " NULL /* node for different */\n"; +$tmp .= " },\n"; +$tmp .= " 0, /* same pos */\n"; +$tmp .= " 0 /* different pos */\n"; +$tmp .= "};\n\n"; +push(@obst_req, $tmp); +push(@obst_header_all, "extern const $arch\_register_req_t $arch\_default_req_none;\n"); + +push(@obst_classdef, "enum reg_classes {\n"); + +my $class_mode; + +# generate register type and class variable, init function and default requirements foreach my $class_name (keys(%reg_classes)) { - my @class = @{ $reg_classes{"$class_name"} }; - my $old_classname = $class_name; - - $class_name = $arch."_".$class_name; - $numregs = "N_".$class_name."_REGS"; - - push(@obst_regtypes, "#define $numregs ".($#class + 1)."\n"); - push(@obst_regtypes, "arch_register_t ".$class_name."_regs[$numregs];\n\n"); - - push(@obst_classdef, "#define CLASS_$class_name $class_idx\n"); - push(@obst_regclasses, "{ \"$class_name\", $numregs, ".$class_name."_regs }"); - - my $idx = 0; - push(@obst_reginit, " /* Init of all registers in class '$class_name' */\n\n"); - foreach (@class) { - $reg2class{$_->{"name"}} = { "class" => $old_classname, "index" => $idx }; # remember reg to class for later use - push(@obst_reginit, " ".$class_name."_regs[$idx].name = \"".$_->{"name"}."\";\n"); - push(@obst_reginit, " ".$class_name."_regs[$idx].reg_class = &$arch\_reg_classes[CLASS_$class_name];\n"); - push(@obst_reginit, " ".$class_name."_regs[$idx].index = $idx;\n"); - push(@obst_reginit, " ".$class_name."_regs[$idx].type = ".$rt[$_->{"type"}].";\n\n"); - $idx++; - } - - $class_idx++; + my @class = @{ $reg_classes{"$class_name"} }; + my $old_classname = $class_name; + + $class_name = $arch."_".$class_name; + $numregs = "N_".$class_name."_REGS"; + $class_ptr = "&".$arch."_reg_classes[CLASS_".$class_name."]"; + $class_mode = pop(@class)->{"mode"}; + + push(@obst_regtypes_decl, "extern arch_register_t ".$class_name."_regs[$numregs];\n"); + push(@obst_regtypes_def, "arch_register_t ".$class_name."_regs[$numregs];\n"); + + push(@obst_classdef, " CLASS_$class_name = $class_idx,\n"); + push(@obst_regclasses, "{ \"$class_name\", $numregs, NULL, ".$class_name."_regs }"); + + # there is a default NORMAL requirement for each class + $tmp = "/* Default NORMAL register requirements for class $class_name */\n"; + $tmp .= "const $arch\_register_req_t $arch\_default_req_$class_name = {\n"; + $tmp .= " {\n"; + $tmp .= " arch_register_req_type_normal,\n"; + $tmp .= " $class_ptr,\n"; + $tmp .= " NULL, /* limit function */ \n"; + $tmp .= " NULL, /* limit environment */\n"; + $tmp .= " NULL, /* node for same */\n"; + $tmp .= " NULL /* node for different */\n"; + $tmp .= " },\n"; + $tmp .= " 0, /* same pos */\n"; + $tmp .= " 0 /* different pos */\n"; + $tmp .= "};\n\n"; + push(@obst_req, $tmp); + push(@obst_header_all, "extern const $arch\_register_req_t $arch\_default_req_$class_name;\n"); + + my $idx = 0; + push(@obst_reginit, " /* Init of all registers in class '$class_name' */\n\n"); + push(@obst_reginit, " /* set largest possible mode for '$class_name' */\n"); + push(@obst_reginit, " $arch\_reg_classes[CLASS_".$class_name."].mode = $class_mode;\n\n"); + push(@obst_regdef, "enum reg_".$class_name."_values {\n"); + foreach (@class) { + # For each class we build for each of it's member registers a limit function + # which limits the class to this particular register. We also build the + # corresponding requirement structs. + # We need those functions to set register requirements on demand in transformation + # esp. for Call and RegParams where we can mix int and float parameters. + + my $limit_func_name = $arch."_limit_".$class_name."_".$_->{"name"}; + + # push the function prototype + $tmp = "void $limit_func_name(void *_unused, bitset_t *bs)"; + push(@obst_defreq_head, $tmp.";\n"); + + # push the function definition + $tmp .= " {\n"; + $tmp .= " bs = bitset_clear_all(bs);\n"; + $tmp .= " bitset_set(bs, REG_".uc($_->{"name"}).");\n"; # REGISTER to index assignment is done some lines down + $tmp .= "}\n\n"; + push(@obst_limit_func, $tmp); + + # push the default requirement struct + $tmp = "const $arch\_register_req_t $arch\_default_req_$class_name\_".$_->{"name"}." = {\n"; + $tmp .= " {\n"; + $tmp .= " arch_register_req_type_limited,\n"; + $tmp .= " $class_ptr,\n"; + $tmp .= " $limit_func_name,\n"; + $tmp .= " NULL, /* limit environment */\n"; + $tmp .= " NULL, /* node for same */\n"; + $tmp .= " NULL /* node for different */\n"; + $tmp .= " },\n"; + $tmp .= " 0, /* same pos */\n"; + $tmp .= " 0 /* different pos */\n"; + $tmp .= "};\n\n"; + push(@obst_req, $tmp); + push(@obst_header_all,"extern const $arch\_register_req_t $arch\_default_req_$class_name\_".$_->{"name"}.";\n"); + + $reg2class{$_->{"name"}} = { "class" => $old_classname, "index" => $idx }; # remember reg to class for later use + push(@obst_regdef, " REG_".uc($_->{"name"})." = $idx,\n"); + push(@obst_reginit, " ".$class_name."_regs[$idx].name = \"".$_->{"name"}."\";\n"); + push(@obst_reginit, " ".$class_name."_regs[$idx].reg_class = $class_ptr;\n"); + push(@obst_reginit, " ".$class_name."_regs[$idx].index = $idx;\n"); + push(@obst_reginit, " ".$class_name."_regs[$idx].type = ".translate_reg_type($_->{"type"}).";\n"); + push(@obst_reginit, "\n"); + $idx++; + } + push(@obst_regdef, " $numregs = $idx\n"); + push(@obst_regdef, "};\n\n"); + + $class_idx++; } +push(@obst_classdef, " N_CLASSES = ".scalar(keys(%reg_classes))."\n"); +push(@obst_classdef, "};\n\n"); + # generate node-register constraints foreach my $op (keys(%nodes)) { - my %n = %{ $nodes{"$op"} }; - - next if (!exists($n{"reg_req"})); - - $op = $arch."_".$op; - - push(@obst_req, "/* IN requirements for '$op' */\n"); - - my @inidx_class; - - # check for argument requirements - if (exists($n{"reg_req"}{"in"})) { - my @in = @{ $n{"reg_req"}{"in"} }; - - for (my $idx = 0; $idx <= $#in; $idx++) { - my $class = undef; - - push(@obst_req, "static const arch_register_req_t ".$op."_reg_req_in_$idx = {\n"); - - if ($in[$idx] eq "none") { - push(@inidx_class, "none"); - push(@obst_req, " arch_register_req_type_none,\n NULL,\n { NULL }"); - } - elsif (is_reg_class($in[$idx])) { - push(@inidx_class, $in[$idx]); - push(@obst_req, " arch_register_req_type_normal,\n &$arch\_reg_classes[CLASS_$arch\_".$in[$idx]."],\n { NULL }"); - } - else { - $class = build_subset_class_func($op, $idx, 1, $in[$idx]); - if (!defined $class) { - die("Could not build subset for IN requirements '$op' pos $idx ... exiting.\n"); - } - push(@inidx_class, $class); - push(@obst_req, " arch_register_req_type_limited,\n &$arch\_reg_classes[CLASS_$arch\_".$class."],\n { limit_reg_".$op."_in_".$idx." }"); - } - - push(@obst_req, "\n};\n\n"); - } - } - - push(@obst_req, "/* OUT requirements for '$op' */\n"); - - # check for result requirements - if (exists($n{"reg_req"}{"out"})) { - my @out = @{ $n{"reg_req"}{"out"} }; - - for (my $idx = 0; $idx <= $#out; $idx++) { - my $class = undef; - - push(@obst_req, "static const arch_register_req_t ".$op."_reg_req_out_$idx = {\n"); - - if ($out[$idx] eq "none") { - push(@obst_req, " arch_register_req_type_none,\n NULL,\n { NULL }"); - } - elsif (is_reg_class($out[$idx])) { - push(@obst_req, " arch_register_req_type_normal,\n &$arch\_reg_classes[CLASS_$arch\_".$out[$idx]."],\n { NULL }"); - } - elsif ($out[$idx] =~ /^(!)?in_s(\d+)/) { # this is a "should be (un)equal to register at in_X" - push(@obst_req, " arch_register_req_type_".($1 ? "un" : "")."equal,\n"); - push(@obst_req, " &$arch\_reg_classes[CLASS_$arch\_".$inidx_class[$2 - 1]."],\n"); - push(@obst_req, " { ".($2 - 1)." }"); - } - else { - $class = build_subset_class_func($op, $idx, 0, $out[$idx]); - if (!defined $class) { - die("Could not build subset for OUT requirements '$op' pos $idx ... exiting.\n"); - } - push(@obst_req, " arch_register_req_type_limited,\n &$arch\_reg_classes[CLASS_$arch\_".$class."],\n { limit_reg_".$op."_out_".$idx." }"); - } - - push(@obst_req, "\n};\n\n"); - } - } + my %n = %{ $nodes{"$op"} }; + + next if (!exists($n{"reg_req"})); + + $op = $arch."_".$op; + + push(@obst_req, "/* IN requirements for '$op' */\n"); + # check for argument requirements + if (exists($n{"reg_req"}{"in"})) { + generate_requirements(\%n, $op, "in"); + } + + push(@obst_req, "/* OUT requirements for '$op' */\n"); + # check for result requirements + if (exists($n{"reg_req"}{"out"})) { + generate_requirements(\%n, $op, "out"); + } } -# generate header file -open(OUT, ">$target_h") || die("Could not open $target_h, reason: $!\n"); +# generate header _t (internal usage) file +open(OUT, ">$target_h_t") || die("Could not open $target_h_t, reason: $!\n"); my $creation_time = localtime(time()); -my $tmp = uc($arch); +$tmp = uc($arch); + +print OUT<$target_h") || die("Could not open $target_h, reason: $!\n"); + +$creation_time = localtime(time()); print OUT<{"reg_req"}{"$inout"})) { + my @reqs = @{ $n->{"reg_req"}{"$inout"} }; + + for (my $idx = 0; $idx <= $#reqs; $idx++) { + my $class = undef; + + if ($reqs[$idx] eq "none") { + $class = "none"; + } + elsif (is_reg_class($reqs[$idx])) { + $class = $reqs[$idx]; + } + else { + my @regs = split(/ /, $reqs[$idx]); +GET_CLASS: foreach my $reg (@regs) { + if ($reg =~ /!?(in|out)\_r\d+/) { + $class = "UNKNOWN_CLASS"; + } + else { + $class = get_reg_class($reg); + if (!defined $class) { + die("Could not get ".uc($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 requirements for the given description +### +sub generate_requirements { + my $n = shift; + my $op = shift; + my $inout = shift; + + # get classes for the complementary direction + my $outin = ($inout eq "in") ? "out" : "in"; + + my @reqs = @{ $n->{"reg_req"}{"$inout"} }; + + for (my $idx = 0; $idx <= $#reqs; $idx++) { + my $class = undef; + + my $tmp2 = "const $arch\_register_req_t _".$op."_reg_req_$inout\_$idx = "; + my $tmp = "#define ".$op."_reg_req_$inout\_$idx "; + + if ($reqs[$idx] eq "none") { + $tmp .= "&$arch\_default_req_none\n"; + } + elsif ($reqs[$idx] =~ /^new_reg_(.*)$/) { + if (is_reg_class($1)) { + $tmp .= "&_".$op."_reg_req_$inout\_$idx\n"; + $tmp2 .= "{\n"; + $tmp2 .= " {\n"; + $tmp2 .= " arch_register_req_type_should_be_different_from_all,\n"; + $tmp2 .= " &$arch\_reg_classes[CLASS_$arch\_".$1."],\n"; + $tmp2 .= " NULL, /* limit function */\n"; + $tmp2 .= " NULL, /* limit environment */\n"; + $tmp2 .= " NULL, /* same node */\n"; + $tmp2 .= " NULL /* different node */\n"; + $tmp2 .= " },\n"; + $tmp2 .= " 0,\n"; + $tmp2 .= " 0\n"; + $tmp2 .= "};\n"; + + push(@obst_req, $tmp2."\n"); + push(@obst_header_all, "extern const $arch\_register_req_t _".$op."_reg_req_$inout\_$idx;\n"); + } + else { + print STDERR "Invalid register class '$1' given in OUT requirement $idx for '$op'.\n"; + } + } + elsif (is_reg_class($reqs[$idx])) { + $tmp .= "&$arch\_default_req_".$arch."_".$reqs[$idx]."\n"; + } + else { + my @req_type_mask; + my ($class, $has_limit, $same_pos, $different_pos) = build_subset_class_func($n, $op, $idx, (($inout eq "in") ? 1 : 0), $reqs[$idx]); + + if (!defined($class)) { + die("Could not build subset for ".uc($inout)." requirements '$op' pos $idx ... exiting.\n"); + } + + if ($has_limit) { + push(@req_type_mask, "arch_register_req_type_limited"); + } + if (defined($same_pos)) { + push(@req_type_mask, "arch_register_req_type_should_be_same"); + } + if (defined($different_pos)) { + push(@req_type_mask, "arch_register_req_type_should_be_different"); + } + + $tmp .= "&_".$op."_reg_req_$inout\_$idx\n"; + $tmp2 .= "{\n"; + $tmp2 .= " {\n"; + $tmp2 .= " ".join(" | ", @req_type_mask).",\n"; + $tmp2 .= " &$arch\_reg_classes[CLASS_$arch\_".$class."],\n"; + $tmp2 .= " ".($has_limit ? "limit_reg_".$op."_$inout\_".$idx : "NULL").",\n"; + $tmp2 .= " NULL, /* limit environment */\n"; + $tmp2 .= " NULL, /* same node */\n"; + $tmp2 .= " NULL /* different node */\n"; + $tmp2 .= " },\n"; + $tmp2 .= " ".(defined($same_pos) ? $same_pos : "0").",\n"; + $tmp2 .= " ".(defined($different_pos) ? $different_pos : "0")."\n"; + $tmp2 .= "};\n"; + + push(@obst_req, $tmp2."\n"); + push(@obst_header_all, "extern const $arch\_register_req_t _".$op."_reg_req_$inout\_$idx;\n"); + } + + push(@obst_requirement_def, $tmp); + } +} ### # Determines whether $name is a specified register class or not. # @return 1 if name is register class, 0 otherwise ### sub is_reg_class { - my $name = shift; - return 1 if exists($reg_classes{"$name"}); - return 0; + my $name = shift; + return 1 if exists($reg_classes{"$name"}); + return 0; } ### @@ -239,9 +480,10 @@ sub is_reg_class { # @return class or undef ### sub get_reg_class { - my $reg = shift; - return $reg2class{"$reg"}{"class"} if (exists($reg2class{"$reg"})); - return undef; + my $reg = shift; + $reg = substr($reg, 1) if ($reg =~ /!.*/); + return $reg2class{"$reg"}{"class"} if (exists($reg2class{"$reg"})); + return undef; } ### @@ -249,90 +491,136 @@ sub get_reg_class { # @return index or undef ### sub get_reg_index { - my $reg = shift; - return $reg2class{"$reg"}{"index"} if (exists($reg2class{"$reg"})); - return undef; + my $reg = shift; + return $reg2class{"$reg"}{"index"} if (exists($reg2class{"$reg"})); + return undef; } ### # 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 +# @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 = ""; - my $temp; - - # build function header - my $op = shift; - my $idx = shift; - my $in = shift; - push(@obst_limit_func, "/* limit the possible registers for ".($in ? "IN" : "OUT")." $idx at op $op */\n"); - push(@obst_limit_func, "int limit_reg_".$op."_".($in ? "in" : "out")."_".$idx."(const ir_node *irn, int pos, bitset_t *bs) {\n"); - - my @regs = split(/ /, shift); - - # set/unset registers - foreach (@regs) { - # check for negate - - if (substr($_, 0, 1) eq "!") { - if (defined($neg) && $neg == 0) { - # we have seen a positiv constraint as first one but this one is negative - # this doesn't make sense - print STDERR "Mixed positive and negative constraints for the same slot are not allowed.\n"; - return undef; - } - - if (!defined($neg)) { - push(@obst_limit_func, " bs = bitset_set_all(bs); /* allow all register (negative constraints given) */\n"); - } - - $_ = substr($_, 1); # skip '!' - $neg = 1; - } - else { - if (defined($neg) && $neg == 1) { - # we have seen a negative constraint as first one but this one is positive - # this doesn't make sense - print STDERR "Mixed positive and negative constraints for the same slot are not allowed.\n"; - return undef; - } - - if (!defined($neg)) { - push(@obst_limit_func, " bs = bitset_clear_all(bs); /* disallow all register (positive constraints given) */\n"); - } - $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; - } - - # set class - if (!$class) { - $class = $temp; - } - elsif ($class ne $temp) { - # all registers must belong to the same class - print STDERR "Registerclass mismatch. '$_' is not member of class '$class'.\n"; - return undef; - } - - if ($neg == 1) { - push(@obst_limit_func, " bitset_clear(bs, ".get_reg_index($_)."); /* disallow $_ */\n"); - } - else { - push(@obst_limit_func, " bitset_set(bs, ".get_reg_index($_)."); /* allow $_ */\n"); - } - } - - push(@obst_limit_func, "\n return ".($neg ? scalar(@{ $reg_classes{"$class"} }) - scalar(@regs) : scalar(@regs)).";\n"); - push(@obst_limit_func, "}\n\n"); - - return $class; + my $neg = undef; + my $class = undef; + my $has_limit = 0; + my $same_pos = undef; + my $different_pos = undef; + my $temp; + my @obst_init; + my @obst_limits; + my @obst_ignore; + + + # build function header + my $n = shift; + my $op = shift; + my $idx = shift; + my $in = shift; + + my $outin = $in ? "out" : "in"; + my @regs = split(/ /, shift); + + my @idx_class = build_inout_idx_class($n, $op, $outin); + + # set/unset registers +CHECK_REQS: foreach (@regs) { + if (/(!)?$outin\_r(\d+)/) { + if (($1 && defined($different_pos)) || (!$1 && defined($same_pos))) { + print STDERR "Multiple in/out references of same type in one requirement not allowed.\n"; + return (undef, undef, undef, undef); + } + + if ($1) { + $different_pos = $in ? -$2 : $2 - 1; + } + else { + $same_pos = $in ? -$2 : $2 - 1; + } + + $class = $idx_class[$2 - 1]; + next CHECK_REQS; + } + + # check for negate + if (substr($_, 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; + push(@obst_init, " bs = bitset_set_all(bs); /* allow all register (negative constraints given) */\n"); + } + + $_ = substr($_, 1); # skip '!' + $neg = 1; + } + else { + if (defined($neg) && $neg == 1) { + # we have seen a negative constraint as first one but this one is positive + # this doesn't make sense + print STDERR "Mixed positive and negative constraints for the same slot are not allowed.\n"; + return (undef, undef, undef, undef); + } + + if (!defined($neg)) { + $has_limit = 1; + push(@obst_init, " bs = bitset_clear_all(bs); /* disallow all register (positive constraints given) */\n"); + } + $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 '$class'.\n"; + return (undef, undef, undef, undef); + } + + if ($neg == 1) { + $has_limit = 1; + push(@obst_limits, " bitset_clear(bs, ".get_reg_index($_)."); /* disallow $_ */\n"); + } + else { + $has_limit = 1; + push(@obst_limits, " bitset_set(bs, ".get_reg_index($_)."); /* allow $_ */\n"); + } + } + + my @cur_class = @{ $reg_classes{"$class"} }; + for (my $idx = 0; $idx <= $#cur_class; $idx++) { + if (defined($cur_class[$idx]{"type"}) && ($cur_class[$idx]{"type"} & 4)) { + push(@obst_ignore, " bitset_clear(bs, ".get_reg_index($cur_class[$idx]{"name"}).");"); + push(@obst_ignore, " /* disallow ignore reg ".$cur_class[$idx]{"name"}." */\n"); + } + } + + if ($has_limit == 1) { + push(@obst_header_all, "void limit_reg_".$op."_".($in ? "in" : "out")."_".$idx."(void *_unused, bitset_t *bs);\n"); + + push(@obst_limit_func, "/* limit the possible registers for ".($in ? "IN" : "OUT")." $idx at op $op */\n"); + push(@obst_limit_func, "void limit_reg_".$op."_".($in ? "in" : "out")."_".$idx."(void *_unused, bitset_t *bs) {\n"); + push(@obst_limit_func, @obst_init); + push(@obst_limit_func, @obst_ignore); + push(@obst_limit_func, @obst_limits); + push(@obst_limit_func, "}\n\n"); + } + + return ($class, $has_limit, $same_pos, $different_pos); }