[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master
From: |
Andrew J. Schorr |
Subject: |
Re: [bug-gawk] macOS: mpfrsqrt check fails on gawk-4.2-stable and master branches |
Date: |
Wed, 7 Feb 2018 15:09:09 -0500 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Feb 07, 2018 at 09:00:30PM +0100, Hermann Peifer wrote:
> I couldn't find anything wrong with the extensions on my side. So I
> patched mpfrsqrt.awk and ended up with the attached log file which is
> completely different from yours, with only 9 iterations rather than 11.
Thanks. We are making progress. So the mismatch starts in the first
calculation.
On linux, we have:
123456790123456790123456790123456790123456790123456790123454320987654320987654320987654320987654320987654320987654321/1234567901234567901234567901234567901234567901234567901234
= 100000000000000000000000000000000000000000000000000000000044
Whereas on MacOS:
123456790123456790123456790123456790123456790123456790123454320987654320987654320987654320987654320987654320987654321/1234567901234567901234567901234567901234567901234567901234
= 99999999999999997168788049560464200849936328366177157906432
This looks like a precision problem. On Linux:
bash-4.2$ echo
123456790123456790123456790123456790123456790123456790123454320987654320987654320987654320987654320987654320987654321
1234567901234567901234567901234567901234567901234567901234 | ./gawk -M
'{printf "%d\n", $1/$2}'
99999999999999997168788049560464200849936328366177157906432
bash-4.2$ echo
123456790123456790123456790123456790123456790123456790123454320987654320987654320987654320987654320987654320987654321
1234567901234567901234567901234567901234567901234567901234 | ./gawk -M -v
PREC=400 '{printf "%d\n", $1/$2}'
100000000000000000000000000000000000000000000000000000000044
What do you see on MacOS?
That being said, I don't know why the PREC value is set higher in
test/mpfrsqrt.awk, since we don't actually set it. I am confused...
If you patch mpfrsqrt.awk to add PREC = 400 near the top, does it give
the right answer?
Regards,
Andy
- [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 <=
- 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, 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