Daily bump.

[pf3gnuchains/gcc-fork.git] / gcc / reorg.c

diff --git a/gcc/reorg.c b/gcc/reorg.c
index 31918ec..161e7b0 100644 (file)
--- a/gcc/reorg.c
+++ b/gcc/reorg.c
@@ -122,6 +122,8 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 
 #include "config.h"
 #include "system.h"
+#include "coretypes.h"
+#include "tm.h"
 #include "toplev.h"
 #include "rtl.h"
 #include "tm_p.h"
@@ -2811,11 +2813,13 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
         that would make the replacement into the insn invalid.  We also can't
         do this if it modifies our source, because it might be an earlyclobber
         operand.  This latter test also prevents updating the contents of
-        a PRE_INC.  */
+        a PRE_INC.  We also can't do this if there's overlap of source and
+        destination.  Overlap may happen for larger-than-register-size modes.  */
 
       if (GET_CODE (trial) == INSN && GET_CODE (pat) == SET
          && GET_CODE (SET_SRC (pat)) == REG
-         && GET_CODE (SET_DEST (pat)) == REG)
+         && GET_CODE (SET_DEST (pat)) == REG
+         && !reg_overlap_mentioned_p (SET_DEST (pat), SET_SRC (pat)))
        {
          rtx next = next_nonnote_insn (trial);