Clean bswap messages and tests

This patch include 2 cleanup that were requested in PR61320:

* Use dg-additional-options to specify the extra option s390 target needs
* Use the correct vocabulary of target endianness instead of host endianness in comments, pass dump and the past ChangeLog entry.

Here are the ChangeLog:

*** gcc/ChangeLog ***

2014-06-04  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* ChangeLog (2014-05-23): Fix ChangeLog entry to refer to target
	endianness instead of host endianness.
	* tree-ssa-math-opts.c (find_bswap_or_nop_1): Likewise in dumps and
	comments.

*** gcc/testsuite/ChangeLog ***

2014-06-04  Thomas Preud'homme  <thomas.preudhomme@arm.com>

2014-06-04  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* gcc.dg/optimize-bswaphi-1.c: Adapt test to change of dump output.
	Specify -march=z900 as an additional option.
	* gcc.dg/optimize-bswapsi-1.c: Likewise for s390 options.
	* gcc.dg/optimize-bswapsi-2.c: Likewise.
	* gcc.dg/optimize-bswapdi-3.c: Likewise for adaptation to dump change.

On Fri, Jun 6, 2014 at 7:32 AM, Thomas Preud'homme
<thomas.preudhomme@arm.com> wrote:
> This patch include 2 cleanup that were requested in PR61320:
>
> * Use dg-additional-options to specify the extra option s390 target needs
> * Use the correct vocabulary of target endianness instead of host endianness in comments, pass dump and the past ChangeLog entry.

Ok.

(just in case you intended to ask ;))

Richard.

> Here are the ChangeLog:
>
> *** gcc/ChangeLog ***
>
> 2014-06-04  Thomas Preud'homme  <thomas.preudhomme@arm.com>
>
>         * ChangeLog (2014-05-23): Fix ChangeLog entry to refer to target
>         endianness instead of host endianness.
>         * tree-ssa-math-opts.c (find_bswap_or_nop_1): Likewise in dumps and
>         comments.
>
> *** gcc/testsuite/ChangeLog ***
>
> 2014-06-04  Thomas Preud'homme  <thomas.preudhomme@arm.com>
>
> 2014-06-04  Thomas Preud'homme  <thomas.preudhomme@arm.com>
>
>         * gcc.dg/optimize-bswaphi-1.c: Adapt test to change of dump output.
>         Specify -march=z900 as an additional option.
>         * gcc.dg/optimize-bswapsi-1.c: Likewise for s390 options.
>         * gcc.dg/optimize-bswapsi-2.c: Likewise.
>         * gcc.dg/optimize-bswapdi-3.c: Likewise for adaptation to dump change.
>
> diff --git a/gcc/ChangeLog b/gcc/ChangeLog
> index de07e5c..09122aa 100644
> --- a/gcc/ChangeLog
> +++ b/gcc/ChangeLog
> @@ -1623,7 +1623,8 @@
>         (find_bswap_or_nop_1): This. Also add support for memory source.
>         (find_bswap): Renamed to ...
>         (find_bswap_or_nop): This. Also add support for memory source and
> -       detection of bitwise operations equivalent to load in host endianness.
> +       detection of bitwise operations equivalent to load in target
> +       endianness.
>         (execute_optimize_bswap): Likewise. Also move its leading comment back
>         in place and split statement transformation into ...
>         (bswap_replace): This.
> diff --git a/gcc/testsuite/gcc.dg/optimize-bswapdi-3.c b/gcc/testsuite/gcc.dg/optimize-bswapdi-3.c
> index 0a8bf2e..d96d7e5 100644
> --- a/gcc/testsuite/gcc.dg/optimize-bswapdi-3.c
> +++ b/gcc/testsuite/gcc.dg/optimize-bswapdi-3.c
> @@ -59,6 +59,6 @@ uint64_t read_be64_3 (unsigned char *data)
>          | ((uint64_t) *(data + 1) << 48) | ((uint64_t) *data << 56);
>  }
>
> -/* { dg-final { scan-tree-dump-times "64 bit load in host endianness found at" 3 "bswap" } } */
> +/* { dg-final { scan-tree-dump-times "64 bit load in target endianness found at" 3 "bswap" } } */
>  /* { dg-final { scan-tree-dump-times "64 bit bswap implementation found at" 3 "bswap" { xfail alpha*-*-* arm*-*-* } } } */
>  /* { dg-final { cleanup-tree-dump "bswap" } } */
> diff --git a/gcc/testsuite/gcc.dg/optimize-bswaphi-1.c b/gcc/testsuite/gcc.dg/optimize-bswaphi-1.c
> index 65bff98..3e51f04 100644
> --- a/gcc/testsuite/gcc.dg/optimize-bswaphi-1.c
> +++ b/gcc/testsuite/gcc.dg/optimize-bswaphi-1.c
> @@ -2,7 +2,7 @@
>  /* { dg-require-effective-target bswap16 } */
>  /* { dg-require-effective-target stdint_types } */
>  /* { dg-options "-O2 -fdump-tree-bswap" } */
> -/* { dg-options "-O2 -fdump-tree-bswap -march=z900" { target s390-*-* } } */
> +/* { dg-additional-options "-march=z900" { target s390-*-* } } */
>
>  #include <stdint.h>
>
> @@ -42,6 +42,6 @@ uint32_t read_be16_3 (unsigned char *data)
>    return *(data + 1) | (*data << 8);
>  }
>
> -/* { dg-final { scan-tree-dump-times "16 bit load in host endianness found at" 3 "bswap" } } */
> +/* { dg-final { scan-tree-dump-times "16 bit load in target endianness found at" 3 "bswap" } } */
>  /* { dg-final { scan-tree-dump-times "16 bit bswap implementation found at" 3 "bswap" { xfail alpha*-*-* arm*-*-* } } } */
>  /* { dg-final { cleanup-tree-dump "bswap" } } */
> diff --git a/gcc/testsuite/gcc.dg/optimize-bswapsi-1.c b/gcc/testsuite/gcc.dg/optimize-bswapsi-1.c
> index 33d0bb0..ebfca60 100644
> --- a/gcc/testsuite/gcc.dg/optimize-bswapsi-1.c
> +++ b/gcc/testsuite/gcc.dg/optimize-bswapsi-1.c
> @@ -2,7 +2,7 @@
>  /* { dg-require-effective-target bswap32 } */
>  /* { dg-require-effective-target stdint_types } */
>  /* { dg-options "-O2 -fdump-tree-bswap" } */
> -/* { dg-options "-O2 -fdump-tree-bswap -march=z900" { target s390-*-* } } */
> +/* { dg-additional-options "-march=z900" { target s390-*-* } } */
>
>  #include <stdint.h>
>
> diff --git a/gcc/testsuite/gcc.dg/optimize-bswapsi-2.c b/gcc/testsuite/gcc.dg/optimize-bswapsi-2.c
> index 518b510..de6e697 100644
> --- a/gcc/testsuite/gcc.dg/optimize-bswapsi-2.c
> +++ b/gcc/testsuite/gcc.dg/optimize-bswapsi-2.c
> @@ -2,7 +2,7 @@
>  /* { dg-require-effective-target bswap32 } */
>  /* { dg-require-effective-target stdint_types } */
>  /* { dg-options "-O2 -fdump-tree-bswap" } */
> -/* { dg-options "-O2 -fdump-tree-bswap -march=z900" { target s390-*-* } } */
> +/* { dg-additional-options "-march=z900" { target s390-*-* } } */
>
>  #include <stdint.h>
>
> @@ -44,6 +44,6 @@ uint32_t read_be32_3 (unsigned char *data)
>          | (*data << 24);
>  }
>
> -/* { dg-final { scan-tree-dump-times "32 bit load in host endianness found at" 3 "bswap" } } */
> +/* { dg-final { scan-tree-dump-times "32 bit load in target endianness found at" 3 "bswap" } } */
>  /* { dg-final { scan-tree-dump-times "32 bit bswap implementation found at" 3 "bswap" { xfail alpha*-*-* arm*-*-* } } } */
>  /* { dg-final { cleanup-tree-dump "bswap" } } */
> diff --git a/gcc/tree-ssa-math-opts.c b/gcc/tree-ssa-math-opts.c
> index 658b341..a928ad9 100644
> --- a/gcc/tree-ssa-math-opts.c
> +++ b/gcc/tree-ssa-math-opts.c
> @@ -1971,7 +1971,7 @@ find_bswap_or_nop_1 (gimple stmt, struct symbolic_number *n, int limit)
>               n->range = n2.range + off_sub;
>
>               /* Reinterpret byte marks in symbolic number holding the value of
> -                bigger weight according to host endianness.  */
> +                bigger weight according to target endianness.  */
>               inc = BYTES_BIG_ENDIAN ? off_sub + n2.range - n1.range : off_sub;
>               mask = 0xFF;
>               if (BYTES_BIG_ENDIAN)
> @@ -2074,7 +2074,7 @@ find_bswap_or_nop (gimple stmt, struct symbolic_number *n, bool *bswap)
>
>    /* A complete byte swap should make the symbolic number to start with
>       the largest digit in the highest order byte. Unchanged symbolic
> -     number indicates a read with same endianness as host architecture.  */
> +     number indicates a read with same endianness as target architecture.  */
>    if (n->n == cmpnop)
>      *bswap = false;
>    else if (n->n == cmpxchg)
> @@ -2204,7 +2204,7 @@ bswap_replace (gimple stmt, gimple_stmt_iterator *gsi, tree src, tree fndecl,
>           if (dump_file)
>             {
>               fprintf (dump_file,
> -                      "%d bit load in host endianness found at: ",
> +                      "%d bit load in target endianness found at: ",
>                        (int)n->range);
>               print_gimple_stmt (dump_file, stmt, 0, 0);
>             }
> @@ -2271,7 +2271,7 @@ bswap_replace (gimple stmt, gimple_stmt_iterator *gsi, tree src, tree fndecl,
>  /* Find manual byte swap implementations as well as load in a given
>     endianness. Byte swaps are turned into a bswap builtin invokation
>     while endian loads are converted to bswap builtin invokation or
> -   simple load according to the host endianness.  */
> +   simple load according to the target endianness.  */
>
>  unsigned int
>  pass_optimize_bswap::execute (function *fun)
>
>
>