case PLUS:
case MINUS:
case MULT:
+ case ASHIFT:
op0 = XEXP (rhs, 0);
op1 = XEXP (rhs, 1);
&& !CONSTANT_P (op1))
return false;
+ if (GET_CODE (rhs) == ASHIFT
+ && CONSTANT_P (op0))
+ return false;
+
return true;
default:
return true;
}
+/* Evaluates shift of IV by constant CST. */
+
+static bool
+iv_shift (struct rtx_iv *iv, rtx mby)
+{
+ enum machine_mode mode = iv->extend_mode;
+
+ if (GET_MODE (mby) != VOIDmode
+ && GET_MODE (mby) != mode)
+ return false;
+
+ if (iv->extend == NIL)
+ {
+ iv->base = simplify_gen_binary (ASHIFT, mode, iv->base, mby);
+ iv->step = simplify_gen_binary (ASHIFT, mode, iv->step, mby);
+ }
+ else
+ {
+ iv->delta = simplify_gen_binary (ASHIFT, mode, iv->delta, mby);
+ iv->mult = simplify_gen_binary (ASHIFT, mode, iv->mult, mby);
+ }
+
+ return true;
+}
+
/* The recursive part of get_biv_step. Gets the value of the single value
defined in INSN wrto initial value of REG inside loop, in shape described
at get_biv_step. */
mby = tmp;
}
break;
-
+
+ case ASHIFT:
+ if (CONSTANT_P (XEXP (rhs, 0)))
+ abort ();
+ op0 = XEXP (rhs, 0);
+ mby = XEXP (rhs, 1);
+ break;
+
default:
abort ();
}
goto end;
break;
+ case ASHIFT:
+ if (!iv_shift (&iv0, mby))
+ goto end;
+ break;
+
default:
break;
}
if (set)
{
lhs = SET_DEST (set);
- if (GET_CODE (lhs) != REG
+ if (!REG_P (lhs)
|| altered_reg_used (&lhs, altered))
ret = true;
}