The customer reported 2 possible problems in shift operation in compiler2.

CONFIGURATION :
OS : Red Hat Enterprise Linux Server release 5 (Itanium)
     Red Hat Enterprise Linux AS release 4 (Itanium)
JDK : 1.4.2_14 / 1.4.2_16 Server VM

1. unsigned right shift operation and shift distance is more than 32

1.4.2_16/hotspot/src/cpu/ia64/vm/ia64.ad:
.....
  3363 enc_class emit_shruI_reg_imm6( gRegI dst, gRegI src, gRegI cnt, pReg qp ) %{
  3364 MacroAssembler _masm(&cbuf);
  3365 if ( (int)$cnt$$constant < 32 )
  3366 __ extru( as_PredicateRegister($qp$$reg), as_Register($dst$$reg), as_Register($src$$reg),
  3367 (int)$cnt$$constant, 32 - (int)$cnt$$constant );
  3368 else
  3369 __ extru( as_PredicateRegister($qp$$reg), as_Register($dst$$reg), as_Register($src$$reg), 31, 1 );
  3370 %}
....

At line#3369, the following code is generated.

  0x2000000005b64a12: extr.u r48=r49,31,1;;

  left-hand operand is positive number : the result is always 0.
  left-hand operand is negative number : the result is always 1.

2. signed right shift operation and shift distance is more than 32

1.4.2_16/hotspot/src/cpu/ia64/vm/ia64.ad:
.....
  3383 enc_class emit_sarI_reg_imm6( gRegI dst, gRegI src, gRegI cnt, pReg qp ) %{
  3384 MacroAssembler _masm(&cbuf);
  3385 if ( (int)$cnt$$constant < 32 )
  3386 __ extr( as_PredicateRegister($qp$$reg), as_Register($dst$$reg), as_Register($src$$reg),
  3387 (int)$cnt$$constant, 32 - (int)$cnt$$constant );
  3388 else
  3389 __ extr( as_PredicateRegister($qp$$reg), as_Register($dst$$reg), as_Register($src$$reg), 31, 1 );
  3390 %}
.....

At line#3389, the following code is generated.

  0x2000000005b64a12: extr r48=r49,31,1;;

  left-hand operand is positive number : the result is always 0.
  left-hand operand is negative number : the result is always -1.