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

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Date:   Thu, 9 Jun 2022 11:16:54 +0530
From:   kajoljain <kjain@...ux.ibm.com>
To:     Ian Rogers <irogers@...gle.com>,
        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>,
        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

Patch looks fine to me

Reviewed-By: Kajol Jain<kjain@...ux.ibm.com>


On 5/27/22 07:36, Ian Rogers 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>
> ---
>  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}