*** old/src/share/vm/c1/c1_LIR.cpp	Tue Aug 25 15:22:48 2009
--- new/src/share/vm/c1/c1_LIR.cpp	Tue Aug 25 15:22:48 2009

*** 565,576 ****
--- 565,574 ----
      case lir_mul:
      case lir_div:
      case lir_rem:
      case lir_sqrt:
      case lir_abs:
      case lir_log:
      case lir_log10:
      case lir_logic_and:
      case lir_logic_or:
      case lir_logic_xor:
      case lir_shl:
      case lir_shr:

*** 642,658 ****
--- 640,659 ----
      }
  
  
      case lir_tan:
      case lir_sin:
-     case lir_cos: {
+     case lir_log:
+     case lir_log10: {
        assert(op->as_Op2() != NULL, "must be");
        LIR_Op2* op2 = (LIR_Op2*)op;
  
        // sin and cos need two temporary fpu stack slots, so register
        // two temp operands.  Register input operand as temp to
        // guarantee that they do not overlap
+       // On x86 tan/sin/cos need two temporary fpu stack slots and
+       // log/log10 need one so handle opr2 and tmp as temp inputs.
+       // Register input operand as temp to guarantee that it doesn't
+       // overlap with the input.
        assert(op2->_info == NULL, "not used");
        assert(op2->_opr1->is_valid(), "used");
        do_input(op2->_opr1); do_temp(op2->_opr1);
  
        if (op2->_opr2->is_valid())         do_temp(op2->_opr2);