1.1 --- a/src/share/vm/adlc/output_h.cpp Wed Aug 10 14:06:57 2011 -0700
1.2 +++ b/src/share/vm/adlc/output_h.cpp Thu Aug 11 12:08:11 2011 -0700
1.3 @@ -1536,12 +1536,16 @@
1.4 // Each instruction attribute results in a virtual call of same name.
1.5 // The ins_cost is not handled here.
1.6 Attribute *attr = instr->_attribs;
1.7 + bool avoid_back_to_back = false;
1.8 while (attr != NULL) {
1.9 if (strcmp(attr->_ident,"ins_cost") &&
1.10 strcmp(attr->_ident,"ins_short_branch")) {
1.11 fprintf(fp," int %s() const { return %s; }\n",
1.12 attr->_ident, attr->_val);
1.13 }
1.14 + // Check value for ins_avoid_back_to_back, and if it is true (1), set the flag
1.15 + if (!strcmp(attr->_ident,"ins_avoid_back_to_back") && attr->int_val(*this) != 0)
1.16 + avoid_back_to_back = true;
1.17 attr = (Attribute *)attr->_next;
1.18 }
1.19
1.20 @@ -1704,6 +1708,16 @@
1.21 }
1.22 }
1.23
1.24 + // flag: if this instruction should not be generated back to back.
1.25 + if ( avoid_back_to_back ) {
1.26 + if ( node_flags_set ) {
1.27 + fprintf(fp," | Flag_avoid_back_to_back");
1.28 + } else {
1.29 + fprintf(fp,"init_flags(Flag_avoid_back_to_back");
1.30 + node_flags_set = true;
1.31 + }
1.32 + }
1.33 +
1.34 // Check if machine instructions that USE memory, but do not DEF memory,
1.35 // depend upon a node that defines memory in machine-independent graph.
1.36 if ( instr->needs_anti_dependence_check(_globalNames) ) {
