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Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master
From: |
Hermann Peifer |
Subject: |
Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches |
Date: |
Wed, 7 Feb 2018 22:01:35 +0100 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 |
On 07.02.18 21:16, Andrew J. Schorr wrote:
> On Wed, Feb 07, 2018 at 03:09:09PM -0500, Andrew J. Schorr wrote:
>> This looks like a precision problem. On Linux:
>>
>> bash-4.2$ echo
>> 123456790123456790123456790123456790123456790123456790123454320987654320987654320987654320987654320987654320987654321
>> 1234567901234567901234567901234567901234567901234567901234 | ./gawk -M
>> '{printf "%d\n", $1/$2}'
>> 99999999999999997168788049560464200849936328366177157906432
>
> This is interesting:
>
> bash-4.2$ echo
> 123456790123456790123456790123456790123456790123456790123454320987654320987654320987654320987654320987654320987654321
> 1234567901234567901234567901234567901234567901234567901234 | ./gawk -M -l
> extension/.libs/intdiv.so '{printf "%d\n", $1/$2; intdiv($1, $2, r); print
> r["quotient"]}'
> 99999999999999997168788049560464200849936328366177157906432
> 100000000000000000000000000000000000000000000000000000000044
>
> So the intdiv function seems to operate using higher precision. I imagine you
> get
> the same answer for both on MacOS...
>
Not really, see below. After adding PREC=400 on the command line, the
division result is correct, but not the result of intdiv().
Hermann
$ echo
123456790123456790123456790123456790123456790123456790123454320987654320987654320987654320987654320987654320987654321
1234567901234567901234567901234567901234567901234567901234 | ./gawk -M
-l extension/.libs/intdiv.so '{printf "%d\n", $1/$2; intdiv($1, $2, r);
print r["quotient"]}'
99999999999999997168788049560464200849936328366177157906432
99999999999999997168788049560464200849936328366177157906432
$
$ echo
123456790123456790123456790123456790123456790123456790123454320987654320987654320987654320987654320987654320987654321
1234567901234567901234567901234567901234567901234567901234 | ./gawk -M
-l extension/.libs/intdiv.so -vPREC=400 '{printf "%d\n", $1/$2;
intdiv($1, $2, r); print r["quotient"]}'
100000000000000000000000000000000000000000000000000000000044
99999999999999997168788049560464200849936328366177157906432
- [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Hermann Peifer, 2018/02/06
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Hermann Peifer, 2018/02/06
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Andrew J. Schorr, 2018/02/06
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Andrew J. Schorr, 2018/02/06
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Hermann Peifer, 2018/02/06
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Andrew J. Schorr, 2018/02/07
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Hermann Peifer, 2018/02/07
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Andrew J. Schorr, 2018/02/07
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Andrew J. Schorr, 2018/02/07
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches,
Hermann Peifer <=
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Andrew J. Schorr, 2018/02/07
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Hermann Peifer, 2018/02/08
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Hermann Peifer, 2018/02/07
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Andrew J. Schorr, 2018/02/07
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Hermann Peifer, 2018/02/08
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, arnold, 2018/02/08
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, arnold, 2018/02/08
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, Andrew J. Schorr, 2018/02/08
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, arnold, 2018/02/08
- Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches, arnold, 2018/02/08