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Subject:	cygwin qsort erratic isolated
To:	cygwin AT cygwin DOT com
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From:	Kurt Carlson via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Kurt Carlson <carlsonkurta AT gmail DOT com>
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The attached source replicates the erratic qsort problem. This compiles
both cygwin and RHEL. In the following, the first descending dpcsort has
erroneous results:

kc: uname -a
CYGWIN_NT-10.0 kacds 3.1.7(0.340/5/3) 2020-08-22 17:48 x86_64 Cygwin
kc: cc c19.c -o c19
kc: ./c19
# consort qsort struct descending -c 300000
# consort:0:
# dpcsort qsort divide descending -c 300000
# dpcsort:0
#  confirmed deaths dpc      location:
239   663437  29259   4.4102 Peru
240   633339  20348   3.2128 Colombia
195   610957  65816  10.7726 Mexico
145   488513  29234   5.9843 Spain
137   338676  41514  12.2577 United Kingdom
190   378752  21797   5.7550 Iran
000 26068854 863584   3.3127 World
237  3997865 123780   3.0962 Brazil
196  6114406 185744   3.0378 United States
246   414739  11344   2.7352 Chile
039   630595  14389   2.2818 South Africa
245   428226   8971   2.0949 Argentina
085  3853406  67376   1.7485 India
169  1005000  17414   1.7327 Russia
084   317528   4351   1.3703 Bangladesh
186   317486   3956   1.2460 Saudi Arabia
# dpcsort qsort divide ascending -c 300000
# dpcsort:1
# dpcsort qsort divide descending -c 300000
# dpcsort:0
#  confirmed deaths dpc      location:
137   338676  41514  12.2577 United Kingdom
195   610957  65816  10.7726 Mexico
145   488513  29234   5.9843 Spain
190   378752  21797   5.7550 Iran
239   663437  29259   4.4102 Peru
000 26068854 863584   3.3127 World
240   633339  20348   3.2128 Colombia
237  3997865 123780   3.0962 Brazil
196  6114406 185744   3.0378 United States
246   414739  11344   2.7352 Chile
039   630595  14389   2.2818 South Africa
245   428226   8971   2.0949 Argentina
085  3853406  67376   1.7485 India
169  1005000  17414   1.7327 Russia
084   317528   4351   1.3703 Bangladesh
186   317486   3956   1.2460 Saudi Arabia

In researching this I looked at source for eight qsort implementations:

1a. gnu (RHEL 7): Always works.
        ./c19

1b. RHEL/gnu compiled under cygwin: Always works.
        Not proviced in c19.c
    Had to incorporate both qsort.c and msort.c glibc stdlib.

2a. cygwin unmodified: fails (above example)
        ./c19
    Both insertion sorts 'goto pop' vs. return.

2b. cygwin modified: mostly works
        ./c19 -q qcygw -r
    Commented out secondary insertion sort (per Dennis de Champeaux).

2c. cygwin compiled under RHEL 7: fails (as under cygwin)
        ./c19 -q qcygw

2d. cygwin modified under RHEL 7 (like 2b): mostly works
        ./c19 -q qcygw -r

3.  netbsd: mostly works
        Not provided in c19.c
    The only insertion sort returns.

4.  openbsd: mosly works
        Not provided in c19.c
    Both insertion sorts return.

5.  freebsd: did not attempt
    Both insertion sorts return.

6.  MacOS: did not attempt
    Both insertion sorts return.

7.  Android: did not attempt (older version of openbsd)
    Both insertion sorts return.

8.  Dennis de Chameaux 'bentley': mostly works
        Not provided with c19
    Besides commenting out secondary insertion sort, this code
    has return vs. goto and he made corrections to reduce recursion.

Types 2-8 diverged (greatly) from the same base. The cygwin version is a
bit puzzling using goto vs. return when there is a general concern for
stack usage with the recursive calls. All versions of qsort are cryptic
(stated kindly). I believe gnu did the right thing in re-writing, but it
still is not a pleasant read.

The failures are triggered with values from a float divide by zero, either
in the compare routine or imbedded in the structure being sorted. While
divide by zero behaviour is "undefined" that really should not extend to
qsort erraticism. The "mostly works" gets the numeric values in the correct
order, but the divide by zero values are mis-placed.

For a better representation use either cygwin or RHEL:
        ./c19 -c 0 -z -q qcygw -r

If you add the --verbose option, values are displayed in the compare
routine. The divide by zero float is always 0xffc00000. Any subtract
operation with that value always results (int) as 0x80000000,
pathologically negative.

All four bsd variants I attempted, both under cygwin and rhel, do not fully
cope with the 0xffc00000, cygwin most poorly. I contacted Dennis de
Champeaux, this problem is unique from what he previously addressed
although his fix improves cygwin's qsort up to the other bsd variants. The
obvious circumvention is to avoid divide by zero. That all bsd variants
have similar issues, and the crypticness of all the variants, it is less
than optimal to attempt any kind of fix. E.g., call it not "broken" but a
"feature" of undefined divide by zero even though it is well removed from
the operation and a non-issue for RHEL. Be prepared to advise anybody who
experiences erratic qsort behaviour of this "feature".

Please advise what, if any, assistance I can provide at this point.
Regards, Kurt

-- 
Kurt Carlson -- 509-730-4814 -- carlsonkurta AT gmail DOT com

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