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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 Aug 23 23:18:49 2010 +0200 (2010-08-23)
changeset 2099 1bb063c8a0ca
parent 746 b150d6f590fc
permissions -rw-r--r--
complibs: noone is using companion libs on the target; nuke them

As there's no longer any user of the companion libraries on the
target, nuke the build for the target.

Well, at least, there's libelf that's still needed by ltrace, so
we keep it.

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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