1.1 --- a/src/share/vm/opto/loopopts.cpp Fri Feb 29 11:22:27 2008 -0800
1.2 +++ b/src/share/vm/opto/loopopts.cpp Fri Feb 29 19:07:15 2008 -0800
1.3 @@ -435,9 +435,11 @@
1.4
1.5 // Check profitability
1.6 int cost = 0;
1.7 + int phis = 0;
1.8 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) {
1.9 Node *out = region->fast_out(i);
1.10 if( !out->is_Phi() ) continue; // Ignore other control edges, etc
1.11 + phis++;
1.12 PhiNode* phi = out->as_Phi();
1.13 switch (phi->type()->basic_type()) {
1.14 case T_LONG:
1.15 @@ -489,6 +491,12 @@
1.16 }
1.17 }
1.18 if( cost >= ConditionalMoveLimit ) return NULL; // Too much goo
1.19 + Node* bol = iff->in(1);
1.20 + assert( bol->Opcode() == Op_Bool, "" );
1.21 + int cmp_op = bol->in(1)->Opcode();
1.22 + // It is expensive to generate flags from a float compare.
1.23 + // Avoid duplicated float compare.
1.24 + if( phis > 1 && (cmp_op == Op_CmpF || cmp_op == Op_CmpD)) return NULL;
1.25
1.26 // --------------
1.27 // Now replace all Phis with CMOV's
