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patches/gcc/3.4.6/160-arm-ldm-peephole2.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Mon Mar 28 01:05:18 2011 +0200 (2011-03-28)
changeset 2362 0888065f8c4d
parent 746 b150d6f590fc
permissions -rw-r--r--
cc/gcc: cleanup the _or_later logic

So far, we've had a version always select appropriate _or_later option,
which in turn would select all previous _or_later options.

Because the dependencies on companion libs were cumulative, that was
working OK. But the upcoming 4.6 will no longer depend on libelf, so
we can't keep the cumulative scheme we've been using so far.

Have each release family select the corresponding dependencies, instead
of relying on selecting previous _or_later.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr> 
     1 diff -durN gcc-3.4.6.orig/gcc/config/arm/arm.c gcc-3.4.6/gcc/config/arm/arm.c

     2 --- gcc-3.4.6.orig/gcc/config/arm/arm.c	2007-08-15 22:57:51.000000000 +0200

     3 +++ gcc-3.4.6/gcc/config/arm/arm.c	2007-08-15 22:57:51.000000000 +0200

     4 @@ -4572,6 +4572,10 @@

     5  int

     6  adjacent_mem_locations (rtx a, rtx b)

     7  {

     8 +  /* We don't guarantee to preserve the order of these memory refs.  */

     9 +  if (volatile_refs_p (a) || volatile_refs_p (b))

    10 +    return 0;

    11 +

    12    if ((GET_CODE (XEXP (a, 0)) == REG

    13         || (GET_CODE (XEXP (a, 0)) == PLUS

    14  	   && GET_CODE (XEXP (XEXP (a, 0), 1)) == CONST_INT))

    15 @@ -4611,6 +4615,17 @@

    16  	return 0;

    17  

    18        val_diff = val1 - val0;

    19 +

    20 +      if (arm_ld_sched)

    21 +	{

    22 +	  /* If the target has load delay slots, then there's no benefit

    23 +	     to using an ldm instruction unless the offset is zero and

    24 +	     we are optimizing for size.  */

    25 +	  return (optimize_size && (REGNO (reg0) == REGNO (reg1))

    26 +		  && (val0 == 0 || val1 == 0 || val0 == 4 || val1 == 4)

    27 +		  && (val_diff == 4 || val_diff == -4));

    28 +	}

    29 +

    30        return ((REGNO (reg0) == REGNO (reg1))

    31  	      && (val_diff == 4 || val_diff == -4));

    32      }
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