aboutsummaryrefslogtreecommitdiffstats
path: root/erts/emulator/utils
diff options
context:
space:
mode:
authorBjörn Gustavsson <[email protected]>2010-12-14 07:23:19 +0100
committerBjörn Gustavsson <[email protected]>2011-01-17 15:23:40 +0100
commit56da36ef79a1c7ffb39836e1838084ed53dda6f0 (patch)
tree33371d2db9f501bc9ce80ba695ac642337646356 /erts/emulator/utils
parent4d6e7ac0aa307271e0b265dd41dea4eb0fc1dee7 (diff)
downloadotp-56da36ef79a1c7ffb39836e1838084ed53dda6f0.tar.gz
otp-56da36ef79a1c7ffb39836e1838084ed53dda6f0.tar.bz2
otp-56da36ef79a1c7ffb39836e1838084ed53dda6f0.zip
Support packing of the 'I' type in a 64-bit emulator
In many (not all) cases, the value for the 'I' type will fit into 32 bits.
Diffstat (limited to 'erts/emulator/utils')
-rwxr-xr-xerts/emulator/utils/beam_makeops32
1 files changed, 27 insertions, 5 deletions
diff --git a/erts/emulator/utils/beam_makeops b/erts/emulator/utils/beam_makeops
index 00bddd2548..cf18ea4a92 100755
--- a/erts/emulator/utils/beam_makeops
+++ b/erts/emulator/utils/beam_makeops
@@ -513,12 +513,14 @@ sub emulator_output {
print "#define NUM_SPECIFIC_OPS ", scalar(@op_to_name), "\n";
print "\n";
print "#ifdef ARCH_64\n";
+ print "# define BEAM_WIDE_MASK 0xFFFFUL\n";
print "# define BEAM_LOOSE_MASK 0x1FFFUL\n";
print "#if HALFWORD_HEAP\n";
print "# define BEAM_TIGHT_MASK 0x1FFCUL\n";
print "#else\n";
print "# define BEAM_TIGHT_MASK 0x1FF8UL\n";
print "#endif\n";
+ print "# define BEAM_WIDE_SHIFT 32\n";
print "# define BEAM_LOOSE_SHIFT 16\n";
print "# define BEAM_TIGHT_SHIFT 16\n";
print "#else\n";
@@ -956,15 +958,25 @@ sub do_pack {
my(@args) = @_;
my($packable_args) = 0;
my @is_packable; # Packability (boolean) for each argument.
+ my $wide_packing = 0;
#
# Count the number of packable arguments. If we encounter any 's' or 'd'
# arguments, packing is not possible.
#
+ my $packable_types = "xytQ";
foreach my $arg (@args) {
- if ($arg =~ /^[xytQ]/) {
+ if ($arg =~ /^[$packable_types]/) {
$packable_args++;
push @is_packable, 1;
+ } elsif ($arg =~ /^I/ and $wordsize == 64 and $packable_args < 2) {
+ $wide_packing = 1;
+ push @is_packable, 1;
+ if (++$packable_args == 2) {
+ # We can only pack two arguments. Turn off packing
+ # for the rest of the arguments.
+ $packable_types = "\xFF";
+ }
} elsif ($arg =~ /^[sd]/) {
return ('', '', @args);
} else {
@@ -992,9 +1004,19 @@ sub do_pack {
$args_per_word = 2;
}
- my(@shift) = @{$pack_shift[$args_per_word]};
- my(@mask) = @{$pack_mask[$args_per_word]};
- my(@pack_instr) = @{$pack_instr[$args_per_word]};
+ my @shift;
+ my @mask;
+ my @instr;
+
+ if ($wide_packing) {
+ @shift = ('0', 'BEAM_WIDE_SHIFT');
+ @mask = ('BEAM_WIDE_MASK', $WHOLE_WORD);
+ @instr = ('w', 'i');
+ } else {
+ @shift = @{$pack_shift[$args_per_word]};
+ @mask = @{$pack_mask[$args_per_word]};
+ @instr = @{$pack_instr[$args_per_word]};
+ }
#
# Now generate the packing instructions. One complication is that
@@ -1022,7 +1044,7 @@ sub do_pack {
$this_size = 1;
}
- $down = "$pack_instr[$ap]$down";
+ $down = "$instr[$ap]$down";
my($unpack) = &make_unpack($tmpnum, $shift[$ap], $mask[$ap]);
$args[$i] = "pack:$this_size:$reg" . "b($unpack)";