/* Otherwise use a shift instruction. */
return AS2 (sal%L0,%2,%0);
}
+
+/* Calculate the length of the memory address in the instruction
+ encoding. Does not include the one-byte modrm, opcode, or prefix. */
+
+int
+memory_address_length (addr)
+ rtx addr;
+{
+ rtx base, index, disp, scale;
+ rtx op0, op1;
+ int len;
+
+ if (GET_CODE (addr) == PRE_DEC
+ || GET_CODE (addr) == POST_INC)
+ return 0;
+
+ /* Register Indirect. */
+ if (register_operand (addr, Pmode))
+ {
+ /* Special cases: ebp and esp need the two-byte modrm form.
+
+ We change [ESI] to [ESI+0] on the K6 when not optimizing
+ for size. */
+ if (addr == stack_pointer_rtx
+ || addr == arg_pointer_rtx
+ || addr == frame_pointer_rtx
+ || (REGNO_REG_CLASS (REGNO (addr)) == SIREG
+ && ix86_cpu == PROCESSOR_K6 && !optimize_size)
+ return 1;
+ else
+ return 0;
+ }
+
+ /* Direct Addressing. */
+ if (CONSTANT_P (addr))
+ return 4;
+
+ index = base = disp = scale = NULL_RTX;
+ op0 = XEXP (addr, 0);
+ op1 = XEXP (addr, 1);
+
+ if (GET_CODE (addr) == PLUS)
+ {
+ if (register_operand (op0, Pmode))
+ {
+ if (register_operand (op1, Pmode))
+ index = op0, base = op1;
+ else
+ base = op0, disp = op1;
+ }
+ else if (GET_CODE (op0) == MULT)
+ {
+ index = XEXP (op0, 0);
+ scale = XEXP (op0, 1);
+ if (register_operand (op1, Pmode))
+ base = op1;
+ else
+ disp = op1;
+ }
+ else if (GET_CODE (op0) == PLUS && GET_CODE (XEXP (op0, 0)) == MULT)
+ {
+ index = XEXP (XEXP (op0, 0), 0);
+ scale = XEXP (XEXP (op0, 0), 1);
+ base = XEXP (op0, 1);
+ disp = op1;
+ }
+ else if (GET_CODE (op0) == PLUS)
+ {
+ index = XEXP (op0, 0);
+ base = XEXP (op0, 1);
+ disp = op1;
+ }
+ else
+ abort ();
+ }
+ else if (GET_CODE (addr) == MULT
+ /* We're called for lea too, which implements ashift on occasion. */
+ || GET_CODE (addr) == ASHIFT)
+ {
+ index = XEXP (addr, 0);
+ scale = XEXP (addr, 1);
+ }
+ else
+ abort ();
+
+ /* Allow arg pointer and stack pointer as index if there is not scaling */
+ if (base && index && !scale
+ && (index == stack_pointer_rtx
+ || index == arg_pointer_rtx
+ || index == frame_pointer_rtx))
+ {
+ rtx tmp = base;
+ base = index;
+ index = tmp;
+ }
+
+ /* Special case: ebp cannot be encoded as a base without a displacement. */
+ if (base == frame_pointer_rtx && !disp)
+ disp = const0_rtx;
+
+ /* Find the length of the displacement constant. */
+ len = 0;
+ if (disp)
+ {
+ if (GET_CODE (disp) == CONST_INT
+ && CONST_OK_FOR_LETTER_P (INTVAL (disp), 'K'))
+ len = 1;
+ else
+ len = 4;
+ }
+
+ /* An index requires the two-byte modrm form. */
+ if (index)
+ len += 1;
+
+ return len;
+}