/* Transform (subreg (plus reg const)) to (plus (subreg reg) const)
when it is possible. Return X or the transformation result if the
transformation is done. */
static rtx
move_plus_up (rtx x)
{
rtx subreg_reg;
enum machine_mode x_mode, subreg_reg_mode;
if (GET_CODE (x) != SUBREG || !subreg_lowpart_p (x))
return x;
subreg_reg = SUBREG_REG (x);
x_mode = GET_MODE (x);
subreg_reg_mode = GET_MODE (subreg_reg);
if (GET_CODE (x) == SUBREG && GET_CODE (subreg_reg) == PLUS
&& GET_MODE_SIZE (x_mode) <= GET_MODE_SIZE (subreg_reg_mode)
&& CONSTANT_P (XEXP (subreg_reg, 1))
&& GET_MODE_CLASS (x_mode) == MODE_INT
&& GET_MODE_CLASS (subreg_reg_mode) == MODE_INT)
{
rtx cst = simplify_subreg (x_mode, XEXP (subreg_reg, 1), subreg_reg_mode,
subreg_lowpart_offset (x_mode,
subreg_reg_mode));
if (cst && CONSTANT_P (cst))
return gen_rtx_PLUS (x_mode, lowpart_subreg (x_mode,
XEXP (subreg_reg, 0),
subreg_reg_mode), cst);
}
return x;
}
static void
kill_value (const_rtx x, struct value_data *vd)
{
if (GET_CODE (x) == SUBREG)
{
rtx tmp = simplify_subreg (GET_MODE (x), SUBREG_REG (x),
GET_MODE (SUBREG_REG (x)), SUBREG_BYTE (x));
x = tmp ? tmp : SUBREG_REG (x);
}
if (REG_P (x))
kill_value_regno (REGNO (x), REG_NREGS (x), vd);
}
static void
kill_value (const_rtx x, struct value_data *vd)
{
if (GET_CODE (x) == SUBREG)
{
rtx tmp = simplify_subreg (GET_MODE (x), SUBREG_REG (x),
GET_MODE (SUBREG_REG (x)), SUBREG_BYTE (x));
x = tmp ? tmp : SUBREG_REG (x);
}
if (REG_P (x))
{
unsigned int regno = REGNO (x);
unsigned int n = hard_regno_nregs[regno][GET_MODE (x)];
kill_value_regno (regno, n, vd);
}
}
static void
kill_value (rtx x, struct value_data *vd)
{
rtx orig_rtx = x;
if (GET_CODE (x) == SUBREG)
{
x = simplify_subreg (GET_MODE (x), SUBREG_REG (x),
GET_MODE (SUBREG_REG (x)), SUBREG_BYTE (x));
if (x == NULL_RTX)
x = SUBREG_REG (orig_rtx);
}
if (REG_P (x))
{
unsigned int regno = REGNO (x);
unsigned int n = hard_regno_nregs[regno][GET_MODE (x)];
kill_value_regno (regno, n, vd);
}
}
