From 76b4ff5c5db9610ecd09b11d3816f25b1e6b58f8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Tue, 5 Sep 2017 08:30:30 +0200
Subject: Add information about offset to common group start position

---
 erts/emulator/beam/erl_vm.h      | 1 +
 erts/emulator/utils/beam_makeops | 8 +++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

(limited to 'erts')

diff --git a/erts/emulator/beam/erl_vm.h b/erts/emulator/beam/erl_vm.h
index f2d0af64df..076767c7cd 100644
--- a/erts/emulator/beam/erl_vm.h
+++ b/erts/emulator/beam/erl_vm.h
@@ -159,6 +159,7 @@ typedef struct op_entry {
    Uint32 mask[3];		/* Signature mask. */
    unsigned involves_r;		/* Needs special attention when matching. */
    int sz;			/* Number of loaded words. */
+   int adjust;                  /* Adjustment for start of instruction. */
    char* pack;			/* Instructions for packing engine. */
    char* sign;			/* Signature string. */
 } OpEntry;
diff --git a/erts/emulator/utils/beam_makeops b/erts/emulator/utils/beam_makeops
index e55d3eadb5..ccbd0dbaf4 100755
--- a/erts/emulator/utils/beam_makeops
+++ b/erts/emulator/utils/beam_makeops
@@ -80,6 +80,7 @@ my %gen_opnum;
 my %num_specific;
 my %gen_to_spec;
 my %specific_op;
+my %group_size;                 # Group size for specific operators.
 
 my %gen_arity;
 my @gen_arity;
@@ -623,7 +624,11 @@ sub emulator_output {
 		$sep = ",";
 	    }
 	    $init .= "}";
-	    init_item($print_name, $init, $involves_r, $size, $pack, $sign);
+            my $adj = 0;
+            if (defined $group_size{$print_name}) {
+                $adj = $size - $group_size{$print_name};
+            }
+	    init_item($print_name, $init, $involves_r, $size, $adj, $pack, $sign);
 	    $op_to_name[$spec_opnum] = $instr;
 	    $spec_opnum++;
 	}
@@ -1171,6 +1176,7 @@ sub combine_instruction_group {
             if ($opcase ne '') {
                 $gcode .= "OpCase($opcase):\n";
                 push @opcase_labels, $opcase;
+                $group_size{$opcase} = $group_size + 1;
             }
             if ($num_references{$label}) {
                 $gcode .= "$label:\n";
-- 
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