linux-kernel - Re: [PATCH] perf expr: Allow exponents on floating point values

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Date:   Wed, 8 Jun 2022 22:30:17 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf expr: Allow exponents on floating point values

On Thu, May 26, 2022 at 7:06 PM Ian Rogers <irogers@...gle.com> wrote:
>
> Pass the optional exponent component through to strtod that already
> supports it. We already have exponents in ScaleUnit and so this adds
> uniformity.
>
> Reported-by: Zhengjun Xing <zhengjun.xing@...ux.intel.com>
> Signed-off-by: Ian Rogers <irogers@...gle.com>

Ping. Simple fix with tests, PTAL. Thanks,
Ian

> ---
>  tools/perf/tests/expr.c | 2 ++
>  tools/perf/util/expr.l  | 2 +-
>  2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/tests/expr.c b/tools/perf/tests/expr.c
> index d54c5371c6a6..5c0032fe93ae 100644
> --- a/tools/perf/tests/expr.c
> +++ b/tools/perf/tests/expr.c
> @@ -97,6 +97,8 @@ static int test__expr(struct test_suite *t __maybe_unused, int subtest __maybe_u
>         ret |= test(ctx, "2.2 > 2.2", 0);
>         ret |= test(ctx, "2.2 < 1.1", 0);
>         ret |= test(ctx, "1.1 > 2.2", 0);
> +       ret |= test(ctx, "1.1e10 < 1.1e100", 1);
> +       ret |= test(ctx, "1.1e2 > 1.1e-2", 1);
>
>         if (ret) {
>                 expr__ctx_free(ctx);
> diff --git a/tools/perf/util/expr.l b/tools/perf/util/expr.l
> index 0a13eb20c814..4dc8edbfd9ce 100644
> --- a/tools/perf/util/expr.l
> +++ b/tools/perf/util/expr.l
> @@ -91,7 +91,7 @@ static int literal(yyscan_t scanner)
>  }
>  %}
>
> -number         ([0-9]+\.?[0-9]*|[0-9]*\.?[0-9]+)
> +number         ([0-9]+\.?[0-9]*|[0-9]*\.?[0-9]+)(e-?[0-9]+)?
>
>  sch            [-,=]
>  spec           \\{sch}
> --
> 2.36.1.124.g0e6072fb45-goog
>