diff options
Diffstat (limited to 'erts')
| -rwxr-xr-x | erts/emulator/utils/beam_makeops | 41 |
1 files changed, 32 insertions, 9 deletions
diff --git a/erts/emulator/utils/beam_makeops b/erts/emulator/utils/beam_makeops index 50dd534828..d7791d23fa 100755 --- a/erts/emulator/utils/beam_makeops +++ b/erts/emulator/utils/beam_makeops @@ -1129,9 +1129,28 @@ sub combine_instruction_group { # Variables. my %offsets; my @instrs; - my %num_references; + my %num_references; # Number of references from other sub instructions. my $group_size = 999; + # + # Calculate the number of references from other sub instructions. + # This number is useful in several ways: + # + # * If this number is 0, it is only used as the entry point for a + # function, implying that it does not need a label and that operands + # can be packed into the instruction word. + # + # * We'll use this number in the sort key, as a tie breaker for sub instructions + # at the same instruction offset. + # + foreach my $ref_instr (@in_instrs) { + my(undef,undef,$first_sub,@other_subs) = @$ref_instr; + $num_references{$first_sub} += 0; # Make sure it is defined. + foreach my $sub (@other_subs) { + $num_references{$sub}++; + } + } + # Do basic error checking. Associate operands of instructions # with the correct micro instructions. Calculate offsets for micro # instructions. @@ -1157,12 +1176,13 @@ sub combine_instruction_group { foreach (0..$#c_args) { push @first, shift @rest; } - my $size = cg_combined_size(name => $s, args => \@first); + my $size = cg_combined_size(name => $s, + first => $num_references{$s} == 0, + args => \@first); $offsets{$s} = $offset unless defined $offsets{$s} and $offsets{$s} < $offset; $offset += $size - 1; my $label = micro_label($s); - $num_references{$label} = 0; push @new_subs, [$opcase,$label,$s,$size-1,@first]; $opcase = ''; } @@ -1181,9 +1201,8 @@ sub combine_instruction_group { my($opcase,$label,$s,$size,@args) = @{$subs[$i]}; my $next = ''; (undef,$next) = @{$subs[$i+1]} if $i < $#subs; - $num_references{$next}++ if $next; my $instr_info = "$opcase:$label:$next:$s:$size:@args"; - push @all_instrs, [$label,$offsets{$s},$instr_info]; + push @all_instrs, [$label,$s,$offsets{$s},$instr_info]; } } @@ -1191,8 +1210,8 @@ sub combine_instruction_group { my %label_to_offset; my %order_to_offset; foreach my $instr (@all_instrs) { - my($label,$offset,$instr_info) = @$instr; - my $sort_key = sprintf("%02d.%02d", $offset, $num_references{$label}); + my($label,$s,$offset,$instr_info) = @$instr; + my $sort_key = sprintf("%02d.%02d", $offset, $num_references{$s}); push @{$order_to_instrs{$sort_key}}, $instr_info; $label_to_offset{$label} = $offset; $order_to_offset{$sort_key} = $offset; @@ -1231,7 +1250,7 @@ sub combine_instruction_group { $gcode .= "OpCase($opcase):\n"; push @opcase_labels, $opcase; } - if ($num_references{$label}) { + if ($num_references{$s}) { $gcode .= "$label:\n"; } @@ -1249,6 +1268,7 @@ sub combine_instruction_group { my($gen_code,$down,$up) = cg_combined_code(name => $s, + first => $num_references{$s} == 0, extra_comments => $flags, offset => $offset, comp_size => $group_size-$offset, @@ -1314,6 +1334,8 @@ sub cg_basic { sub cg_combined_size { my %params = (@_, pack_options => \@basic_pack_options); + $params{pack_options} = \@extended_pack_options + if $params{first}; my($size) = code_gen(%params); $size; } @@ -1324,7 +1346,8 @@ sub cg_combined_size { sub cg_combined_code { my %params = (@_, pack_options => \@basic_pack_options); - + $params{pack_options} = \@extended_pack_options + if $params{first}; my($size,$code,$pack_spec) = code_gen(%params); if ($pack_spec eq '') { ($code,'',''); |