emit-rtl.c (mark_reg_pointer): Don't increase the alignment of a register that…

emit-rtl.c (mark_reg_pointer): Don't increase the alignment of a register that is already known to be a pointer.

        * emit-rtl.c (mark_reg_pointer): Don't increase the alignment of
        a register that is already known to be a pointer.

From-SVN: r28664

gcc/ChangeLog

+1999-08-11  Richard Earnshaw (rearnsha@arm.com)
+
+	* emit-rtl.c (mark_reg_pointer): Don't increase the alignment of
+	a register that is already known to be a pointer.
+
 1999-08-11  Bruce Korb  <ddsinc09@ix.netcom.com>
 
 	* fixinc/inclhack.tpl: Only install assert.h conditionally.

gcc/emit-rtl.c

@@ -570,9 +570,15 @@ mark_reg_pointer (reg, align)
      rtx reg;
      int align;
 {
-  REGNO_POINTER_FLAG (REGNO (reg)) = 1;
+  if (! REGNO_POINTER_FLAG (REGNO (reg)))
+    {
+      REGNO_POINTER_FLAG (REGNO (reg)) = 1;
 
-  if (align)
+      if (align)
+	REGNO_POINTER_ALIGN (REGNO (reg)) = align;
+    }
+  else if (align && align < REGNO_POINTER_ALIGN (REGNO (reg)))
+    /* We can no-longer be sure just how aligned this pointer is */
     REGNO_POINTER_ALIGN (REGNO (reg)) = align;
 }