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Re: [PATCH 1/2] Consolidate condition check for return value in mp asin and acos
- From: Andreas Jaeger <aj at suse dot com>
- To: Siddhesh Poyarekar <siddhesh at redhat dot com>, libc-alpha at sourceware dot org
- Cc: Allan McRae <allan at archlinux dot org>
- Date: Mon, 28 Oct 2013 09:02:38 +0100
- Subject: Re: [PATCH 1/2] Consolidate condition check for return value in mp asin and acos
- Authentication-results: sourceware.org; auth=none
- References: <20131025123854 dot GM23099 at spoyarek dot pnq dot redhat dot com> <526A680D dot 20405 at archlinux dot org> <CAAHN_R25QQYcNtakKNQd-svpitNvCKbddQoTDB8F1Ak8M_NKPg at mail dot gmail dot com> <20131028064730 dot GC1633 at spoyarek dot pnq dot redhat dot com>
On 10/28/2013 07:47 AM, Siddhesh Poyarekar wrote:
> On Fri, Oct 25, 2013 at 06:48:21PM +0530, Siddhesh Poyarekar wrote:
>> On 25 October 2013 18:16, Allan McRae <allan@archlinux.org> wrote:
>>> You are doing more than add the probe here. I would have thought that
>>> clean-up would need to be a separate patch, or at least have a ChangeLog
>>> entry.
>>
>> OK, I'll split it up in my next iteration.
>
>
> So this is part one of the patch which consolidates the conditionals
> in the return of __sin32 and __cos32 to prepare the code for sstemtap
> probes.
>
> Siddhesh
>
> * sysdeps/ieee754/dbl-64/sincos32.c (__sin32): Consolidate
> conditional check for return value.
> (__cos32): Likewise.
>
> diff --git a/sysdeps/ieee754/dbl-64/sincos32.c b/sysdeps/ieee754/dbl-64/sincos32.c
> index f253b8c..11654d6 100644
> --- a/sysdeps/ieee754/dbl-64/sincos32.c
> +++ b/sysdeps/ieee754/dbl-64/sincos32.c
> @@ -147,10 +147,9 @@ __sin32 (double x, double res, double res1)
> __dbl_mp (x, &c, p); /* c = x */
> __sub (&b, &c, &a, p);
> /* if a > 0 return min (res, res1), otherwise return max (res, res1). */
> - if (a.d[0] > 0)
> - return (res < res1) ? res : res1;
This part should give:
a.d[0] > 0 && !(res < res1)
> - else
> - return (res > res1) ? res : res1;
And this condition:
!(a.d[0] > 0) && !(res > res1)
> + if ((a.d[0] > 0 && res > res1) || (a.d[0] <= 0 && res < res1))
In that case it should be res >= res1 for the first paren and "res <=
res1" for the second.
Andreas
> + res = res1;
> + return res;
> }
>
> /* Receive double x and two double results of cos(x) and return result which is
> @@ -181,10 +180,9 @@ __cos32 (double x, double res, double res1)
> __dbl_mp (x, &c, p); /* c = x */
> __sub (&b, &c, &a, p);
> /* if a > 0 return max (res, res1), otherwise return min (res, res1). */
> - if (a.d[0] > 0)
> - return (res > res1) ? res : res1;
> - else
> - return (res < res1) ? res : res1;
> + if ((a.d[0] > 0 && res < res1) || (a.d[0] <= 0 && res > res1))
> + res = res1;
> + return res;
> }
>
> /* Compute sin() of double-length number (X + DX) as Multi Precision number and
>
--
Andreas Jaeger aj@{suse.com,opensuse.org} Twitter/Identica: jaegerandi
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