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Created attachment 791502[details]
Source file to mpz_gcdext() from libgmp
Description of problem:
GMP's function mpz_gcdext() returns unexpected results.
This library solves the equation format A*S + B*T = G
One test case that highlighted the error was:
INPUT A=345, B=34587345
OUTPUT S=-14436457, T=144, G=15
EXPECTED S=-601519, T=6, G=15
In order to trace the error
I found this problem while building PHP 5.5 from source, I ran into the following failed test:
gmp_yum gcdext() basic tests [ext/gmp/tests/022.phpt]
To isolate the problem to the library or to PHP, I borrowed the attached C program and ran the calculation and it returned the same values as PHP.
I then built the latest version of GMP (5.1.2) and reran the test. This time it produced the expected results:
OUTPUT S=-601519, T=6, G=15
Version-Release number of selected component (if applicable):
gmp-4.3.1-7.el6_2.2.x86_64
How reproducible:
Either the PHP build test or by compiling the attached test program. Since the test program is a lot faster that is included here.
Steps to Reproduce:
1. Run the following commands on a test system
gcc -lgmp -o gmptest gmptest.c
echo 345 > input
echo 34587345 >> input
./gmptest < input
Actual results:
a = 345
b = 34587345
g = 15
s = -14436457
t = 144
g =? 15
a*s + b*t=g
345 * -14436457 + 34587345 * 144 = 15
Expected results:
a = 345
b = 34587345
g = 15
s = -601519
t = 6
g =? 15
a*s + b*t=g
345 * -601519 + 34587345 * 6 = 15
Comment 2RHEL Program Management
2013-10-13 23:13:23 UTC
This request was evaluated by Red Hat Product Management for
inclusion in the current release of Red Hat Enterprise Linux.
Because the affected component is not scheduled to be updated
in the current release, Red Hat is unable to address this
request at this time.
Red Hat invites you to ask your support representative to
propose this request, if appropriate, in the next release of
Red Hat Enterprise Linux.
Comment 3Frantisek Kluknavsky
2014-11-06 14:36:21 UTC
The first result satisfies the equation as well as the second result. I do not see a reason why is it called a bug.
Recent versions of gmp add another constraint - choose one of multiple solutions by minimizing 's'. Old gmp-4.3.1 in RHEL 6 does not have this constraint yet.
Created attachment 791502 [details] Source file to mpz_gcdext() from libgmp Description of problem: GMP's function mpz_gcdext() returns unexpected results. This library solves the equation format A*S + B*T = G One test case that highlighted the error was: INPUT A=345, B=34587345 OUTPUT S=-14436457, T=144, G=15 EXPECTED S=-601519, T=6, G=15 In order to trace the error I found this problem while building PHP 5.5 from source, I ran into the following failed test: gmp_yum gcdext() basic tests [ext/gmp/tests/022.phpt] To isolate the problem to the library or to PHP, I borrowed the attached C program and ran the calculation and it returned the same values as PHP. I then built the latest version of GMP (5.1.2) and reran the test. This time it produced the expected results: OUTPUT S=-601519, T=6, G=15 Version-Release number of selected component (if applicable): gmp-4.3.1-7.el6_2.2.x86_64 How reproducible: Either the PHP build test or by compiling the attached test program. Since the test program is a lot faster that is included here. Steps to Reproduce: 1. Run the following commands on a test system gcc -lgmp -o gmptest gmptest.c echo 345 > input echo 34587345 >> input ./gmptest < input Actual results: a = 345 b = 34587345 g = 15 s = -14436457 t = 144 g =? 15 a*s + b*t=g 345 * -14436457 + 34587345 * 144 = 15 Expected results: a = 345 b = 34587345 g = 15 s = -601519 t = 6 g =? 15 a*s + b*t=g 345 * -601519 + 34587345 * 6 = 15