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patches/gcc/3.4.6/600-gcc34-arm-ldm-peephole.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun Feb 17 22:12:59 2008 +0000 (2008-02-17)
changeset 433 9886aa0a9694
permissions -rw-r--r--
Robert P. J. DAY says:

According to Mike Frysinger, this patch was removed from Gentoo in the
2.3.x series and didn't seem to cause any adverse effects. So toss it
from the patch directories for glibc 2.5 and up. 
     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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