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patches/gcc/3.4.6/600-arm-ldm-peephole.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Mon Jul 28 21:08:01 2008 +0000 (2008-07-28)
changeset 746 b150d6f590fc
parent 339 patches/gcc/3.4.6/600-gcc34-arm-ldm-peephole.patch@bd5e0a849352
permissions -rw-r--r--
Third go at renaming patches to contain neither the package name nor the package version. 
     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	2005-10-01 15:31:38.000000000 +0200

     3 +++ gcc-3.4.6/gcc/config/arm/arm.c	2007-08-15 22:54:59.000000000 +0200

     4 @@ -4857,6 +4857,11 @@

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

     6      }

     7  

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

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

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

    11 +    return 0;

    12 +

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

    14      return 1; /* ldmia */

    15  

    16 @@ -5083,6 +5088,11 @@

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

    18      }

    19  

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

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

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

    23 +    return 0;

    24 +

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

    26      return 1; /* stmia */

    27  

    28 diff -durN gcc-3.4.6.orig/gcc/config/arm/arm.md gcc-3.4.6/gcc/config/arm/arm.md

    29 --- gcc-3.4.6.orig/gcc/config/arm/arm.md	2005-10-01 15:31:38.000000000 +0200

    30 +++ gcc-3.4.6/gcc/config/arm/arm.md	2007-08-15 22:54:59.000000000 +0200

    31 @@ -8811,13 +8811,16 @@

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

    33  )

    34  

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

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

    37 +; optimising for size.

    38  (define_insn "*arith_adjacentmem"

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

    40  	(match_operator:SI 1 "shiftable_operator"

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

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

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

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

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

    46    "*

    47    {

    48      rtx ldm[3];

    49 @@ -8852,6 +8855,8 @@

    50        }

    51     if (val1 && val2)

    52        {

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

    54 +	   will prevent it from happening.  */

    55  	rtx ops[3];

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

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

    58 diff -durN gcc-3.4.6.orig/gcc/genpeep.c gcc-3.4.6/gcc/genpeep.c

    59 --- gcc-3.4.6.orig/gcc/genpeep.c	2003-07-05 07:27:22.000000000 +0200

    60 +++ gcc-3.4.6/gcc/genpeep.c	2007-08-15 22:54:59.000000000 +0200

    61 @@ -381,6 +381,7 @@

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

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

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

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

    66  

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

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