+Thu Dec 3 22:30:18 1998 Michael Hayes <m.hayes@elec.canterbury.ac.nz>
+
+ * alias.c (addr_side_effect_eval): New function.
+ (memrefs_conflict_p): Use it.
+ * rtl.h (addr_side_effect_eval): Prototype it.
+
+
1998-12-02 Joseph S. Myers <jsm28@cam.ac.uk>
* pdp11.md (extendsfdf2): Fix mode mismatch in SET.
return ! (GET_MODE (x_base) == VOIDmode && GET_MODE (y_base) == VOIDmode);
}
+/* Return the address of the (N_REFS + 1)th memory reference to ADDR
+ where SIZE is the size in bytes of the memory reference. If ADDR
+ is not modified by the memory reference then ADDR is returned. */
+
+rtx
+addr_side_effect_eval (addr, size, n_refs)
+ rtx addr;
+ int size;
+ int n_refs;
+{
+ int offset = 0;
+
+ switch (GET_CODE (addr))
+ {
+ case PRE_INC:
+ offset = (n_refs + 1) * size;
+ break;
+ case PRE_DEC:
+ offset = -(n_refs + 1) * size;
+ break;
+ case POST_INC:
+ offset = n_refs * size;
+ break;
+ case POST_DEC:
+ offset = -n_refs * size;
+ break;
+
+ default:
+ return addr;
+ }
+
+ if (offset)
+ addr = gen_rtx_PLUS (GET_MODE (addr), XEXP (addr, 0), GEN_INT (offset));
+ else
+ addr = XEXP (addr, 0);
+
+ return addr;
+}
+
/* Return nonzero if X and Y (memory addresses) could reference the
same location in memory. C is an offset accumulator. When
C is nonzero, we are testing aliases between X and Y + C.
else if (GET_CODE (x) == LO_SUM)
x = XEXP (x, 1);
else
- x = canon_rtx (x);
+ x = canon_rtx (addr_side_effect_eval (x, xsize, 0));
if (GET_CODE (y) == HIGH)
y = XEXP (y, 0);
else if (GET_CODE (y) == LO_SUM)
y = XEXP (y, 1);
else
- y = canon_rtx (y);
+ y = canon_rtx (addr_side_effect_eval (y, ysize, 0));
if (rtx_equal_for_memref_p (x, y))
{
extern void record_base_value PROTO ((int, rtx, int));
extern void record_alias_subset PROTO ((int, int));
+extern rtx addr_side_effect_eval PROTO ((rtx, int, int));
#endif /* _RTL_H */