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patches/gcc/3.4.4/600-gcc34-arm-ldm-peephole.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sat Feb 24 11:00:05 2007 +0000 (2007-02-24)
changeset 1 eeea35fbf182
permissions -rw-r--r--
Add the full crosstool-NG sources to the new repository of its own.
You might just say: 'Yeah! crosstool-NG's got its own repo!".
Unfortunately, that's because the previous repo got damaged beyond repair and I had no backup.
That means I'm putting backups in place in the afternoon.
That also means we've lost history... :-( 
     1 --- gcc-3.4.0/gcc/config/arm/arm.md.arm-ldm-peephole	2004-01-13 08:24:37.000000000 -0500

     2 +++ gcc-3.4.0/gcc/config/arm/arm.md	2004-04-24 18:18:04.000000000 -0400

     3 @@ -8810,13 +8810,16 @@

     4     (set_attr "length" "4,8,8")]

     5  )

     6  

     7 +; Try to convert LDR+LDR+arith into [add+]LDM+arith

     8 +; On XScale, LDM is always slower than two LDRs, so only do this if

     9 +; optimising for size.

    10  (define_insn "*arith_adjacentmem"

    11    [(set (match_operand:SI 0 "s_register_operand" "=r")

    12  	(match_operator:SI 1 "shiftable_operator"

    13  	 [(match_operand:SI 2 "memory_operand" "m")

    14  	  (match_operand:SI 3 "memory_operand" "m")]))

    15     (clobber (match_scratch:SI 4 "=r"))]

    16 -  "TARGET_ARM && adjacent_mem_locations (operands[2], operands[3])"

    17 +  "TARGET_ARM && (!arm_tune_xscale || optimize_size) && adjacent_mem_locations (operands[2], operands[3])"

    18    "*

    19    {

    20      rtx ldm[3];

    21 @@ -8851,6 +8854,8 @@

    22        }

    23     if (val1 && val2)

    24        {

    25 +	/* This would be a loss on a Harvard core, but adjacent_mem_locations()

    26 +	   will prevent it from happening.  */

    27  	rtx ops[3];

    28  	ldm[0] = ops[0] = operands[4];

    29  	ops[1] = XEXP (XEXP (operands[2], 0), 0);

    30 --- gcc-3.4.0/gcc/config/arm/arm.c.arm-ldm-peephole	2004-04-24 18:16:25.000000000 -0400

    31 +++ gcc-3.4.0/gcc/config/arm/arm.c	2004-04-24 18:18:04.000000000 -0400

    32 @@ -4838,6 +4841,11 @@

    33        *load_offset = unsorted_offsets[order[0]];

    34      }

    35  

    36 +  /* For XScale a two-word LDM is a performance loss, so only do this if

    37 +     size is more important.  See comments in arm_gen_load_multiple.  */

    38 +  if (nops == 2 && arm_tune_xscale && !optimize_size)

    39 +    return 0;

    40 +

    41    if (unsorted_offsets[order[0]] == 0)

    42      return 1; /* ldmia */

    43  

    44 @@ -5064,6 +5072,11 @@

    45        *load_offset = unsorted_offsets[order[0]];

    46      }

    47  

    48 +  /* For XScale a two-word LDM is a performance loss, so only do this if

    49 +     size is more important.  See comments in arm_gen_load_multiple.  */

    50 +  if (nops == 2 && arm_tune_xscale && !optimize_size)

    51 +    return 0;

    52 +

    53    if (unsorted_offsets[order[0]] == 0)

    54      return 1; /* stmia */

    55  

    56 --- gcc-3.4.0/gcc/genpeep.c.arm-ldm-peephole	2003-07-05 01:27:22.000000000 -0400

    57 +++ gcc-3.4.0/gcc/genpeep.c	2004-04-24 18:18:04.000000000 -0400

    58 @@ -381,6 +381,7 @@

    59    printf ("#include \"recog.h\"\n");

    60    printf ("#include \"except.h\"\n\n");

    61    printf ("#include \"function.h\"\n\n");

    62 +  printf ("#include \"flags.h\"\n\n");

    63  

    64    printf ("#ifdef HAVE_peephole\n");

    65    printf ("extern rtx peep_operand[];\n\n");
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