openwrt/toolchain/gcc/3.4.5/601-gcc34-arm-ldm-peephole2.patch

   1 The 30_all_gcc34-arm-ldm-peephole.patch from Debian was conflicting
   2 with the newer 36_all_pr16201-fix.patch, so i cut out the hunk from
   3 it that was causing problems and grabbed an updated version from
   4 upstream cvs.
   5
   6 Index: gcc/config/arm/arm.c
   7 ===================================================================
   8 RCS file: /cvsroot/gcc/gcc/gcc/config/arm/arm.c,v
   9 retrieving revision 1.432
  10 retrieving revision 1.433
  11 diff -u -r1.432 -r1.433
  12 --- gcc-3.4.4/gcc/config/arm/arm.c      29 Mar 2005 03:00:23 -0000      1.432
  13 +++ gcc-3.4.4/gcc/config/arm/arm.c      1 Apr 2005 11:02:22 -0000       1.433
  14 @@ -5139,6 +5139,10 @@
  15  int
  16  adjacent_mem_locations (rtx a, rtx b)
  17  {
  18 +  /* We don't guarantee to preserve the order of these memory refs.  */
  19 +  if (volatile_refs_p (a) || volatile_refs_p (b))
  20 +    return 0;
  21 +
  22    if ((GET_CODE (XEXP (a, 0)) == REG
  23         || (GET_CODE (XEXP (a, 0)) == PLUS
  24            && GET_CODE (XEXP (XEXP (a, 0), 1)) == CONST_INT))
  25 @@ -5178,6 +5182,17 @@
  26         return 0;
  27
  28        val_diff = val1 - val0;
  29 +
  30 +      if (arm_ld_sched)
  31 +       {
  32 +         /* If the target has load delay slots, then there's no benefit
  33 +            to using an ldm instruction unless the offset is zero and
  34 +            we are optimizing for size.  */
  35 +         return (optimize_size && (REGNO (reg0) == REGNO (reg1))
  36 +                 && (val0 == 0 || val1 == 0 || val0 == 4 || val1 == 4)
  37 +                 && (val_diff == 4 || val_diff == -4));
  38 +       }
  39 +
  40        return ((REGNO (reg0) == REGNO (reg1))
  41               && (val_diff == 4 || val_diff == -4));
  42      }