toolchain/gcc/patches/linaro/860-fix_extension_elimination.patch

   1 https://bugs.launchpad.net/gcc-linaro/+bug/728315
   2 https://lists.openwrt.org/pipermail/openwrt-devel/2011-March/009847.html
   3
   4 --- a/gcc/ee.c
   5 +++ b/gcc/ee.c
   6 @@ -209,7 +209,11 @@
   7
   8        *regno = REGNO (reg);
   9
  10 -      if (paradoxical_subreg_p (use))
  11 +      /* Non-paradoxical SUBREGs of promoted vars guarantee that the
  12 +        upper (elided) bits of the inner register have a particular value.
  13 +        For our purposes, such SUBREGs act as a full reference to the
  14 +        inner register.  */
  15 +      if (paradoxical_subreg_p (use) || SUBREG_PROMOTED_VAR_P (use))
  16          *size = GET_MODE_BITSIZE (GET_MODE (reg));
  17        else
  18          *size = subreg_lsb (use) + GET_MODE_BITSIZE (GET_MODE (use));