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Re: [PATCH] Fix some narrowing conversion issues


On Tue, Jun 27, 2017 at 7:48 AM, Jakub Jelinek <jakub@redhat.com> wrote:
> Hi!
>
> We build gcc with -Wno-narrowing, for some reason I ended up with old
> Makefile without that and discovered a couple of -Wnarrowing errors.
>
> This patch fixes them.  Bootstrapped/regtested on x86_64-linux (i686-linux
> fails to bootstrap with/without this patch), ok for trunk?

Ok.

> 2017-06-27  Jakub Jelinek  <jakub@redhat.com>
>
>         * predict.c (test_prediction_value_range): Use -1U instead of -1
>         to avoid narrowing conversion warning.
>         * dumpfile.c (dump_options): Wrap all value into dump_flags_t cast
>         to avoid narrowing conversion warning.
>         * opt-functions.awk (var_ref): Return (unsigned short) -1 instead of
>         -1.
>         * optc-gen.awk (END): Expect (unsigned short) -1 instead of -1.
>
> --- gcc/predict.c.jj    2017-06-21 16:53:37.000000000 +0200
> +++ gcc/predict.c       2017-06-26 18:39:33.640190953 +0200
> @@ -4031,7 +4031,7 @@ test_prediction_value_range ()
>  {
>    branch_predictor predictors[] = {
>  #include "predict.def"
> -    {NULL, -1}
> +    {NULL, -1U}
>    };
>
>    for (unsigned i = 0; predictors[i].name != NULL; i++)
> --- gcc/dumpfile.c.jj   2017-06-19 08:27:22.000000000 +0200
> +++ gcc/dumpfile.c      2017-06-26 18:38:44.383762664 +0200
> @@ -110,9 +110,9 @@ static const struct dump_option_value_in
>    {"missed", MSG_MISSED_OPTIMIZATION},
>    {"note", MSG_NOTE},
>    {"optall", MSG_ALL},
> -  {"all", ~(TDF_RAW | TDF_SLIM | TDF_LINENO | TDF_GRAPH | TDF_STMTADDR
> -           | TDF_RHS_ONLY | TDF_NOUID | TDF_ENUMERATE_LOCALS | TDF_SCEV
> -           | TDF_GIMPLE)},
> +  {"all", dump_flags_t (~(TDF_RAW | TDF_SLIM | TDF_LINENO | TDF_GRAPH
> +                       | TDF_STMTADDR | TDF_RHS_ONLY | TDF_NOUID
> +                       | TDF_ENUMERATE_LOCALS | TDF_SCEV | TDF_GIMPLE))},
>    {NULL, 0}
>  };
>
> --- gcc/opt-functions.awk.jj    2017-01-08 17:41:19.000000000 +0100
> +++ gcc/opt-functions.awk       2017-06-26 18:54:15.174940306 +0200
> @@ -275,7 +275,7 @@ function var_ref(name, flags)
>                 return "offsetof (struct gcc_options, x_target_flags)"
>         if (opt_args("InverseMask", flags) != "")
>                 return "offsetof (struct gcc_options, x_target_flags)"
> -       return "-1"
> +       return "(unsigned short) -1"
>  }
>
>  # Given the option called NAME return a sanitized version of its name.
> --- gcc/optc-gen.awk.jj 2017-02-25 00:15:02.000000000 +0100
> +++ gcc/optc-gen.awk    2017-06-26 18:55:41.613928361 +0200
> @@ -336,7 +336,7 @@ for (i = 0; i < n_opts; i++) {
>                 alias_posarg = nth_arg(1, alias_arg)
>                 alias_negarg = nth_arg(2, alias_arg)
>
> -               if (var_ref(opts[i], flags[i]) != "-1")
> +               if (var_ref(opts[i], flags[i]) != "(unsigned short) -1")
>                         print "#error Alias setting variable"
>
>                 if (alias_posarg != "" && alias_negarg == "") {
>
>         Jakub


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