(find_regno_note): Find note that overlaps REGNO, not just one that

mentions REGNO explicitly.

From-SVN: r3929

diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c
index 658f57f680338c1300664853bb47af090fa644c3..549f9054f6ec7a38082e60f104d4ab61ea5b4309 100644 (file)
--- a/gcc/rtlanal.c
+++ b/gcc/rtlanal.c
@@ -1135,7 +1135,9 @@ find_reg_note (insn, kind, datum)
 }
 
 /* Return the reg-note of kind KIND in insn INSN which applies to register
-   number REGNO, if any.  Return 0 if there is no such reg-note.  */
+   number REGNO, if any.  Return 0 if there is no such reg-note.  Note that
+   the REGNO of this NOTE need not be REGNO if REGNO is a hard register;
+   it might be the case that the note overlaps REGNO.  */
 
 rtx
 find_regno_note (insn, kind, regno)
@@ -1150,7 +1152,12 @@ find_regno_note (insn, kind, regno)
        /* Verify that it is a register, so that scratch and MEM won't cause a
           problem here.  */
        && GET_CODE (XEXP (link, 0)) == REG
-       && REGNO (XEXP (link, 0)) == regno)
+       && REGNO (XEXP (link, 0)) <= regno
+       && ((REGNO (XEXP (link, 0))
+            + (REGNO (XEXP (link, 0)) >= FIRST_PSEUDO_REGISTER ? 1
+               : HARD_REGNO_NREGS (REGNO (XEXP (link, 0)),
+                                   GET_MODE (XEXP (link, 0)))))
+           > regno))
       return link;
   return 0;
 }