#39097 [NEW]: Decimal order of magnitude of precision lost between 5.2.0RC4 and RC5

From: phpbugrep-20061009 at pgregg dot com Operating system: FreeBSD PHP version: 5.2.0RC5 PHP Bug Type: Math related Bug description: Decimal order of magnitude of precision lost between 5.2.0RC4 and RC5 Description: ------------ Running make test on 5.2.0RC4 fails with: FAIL Math constants [ext/standard/tests/math/constants.phpt] Reproduce code: --------------- Add this additional debug to run-tests.php at line 1494: $output_pgarr = explode("\n", $output); $wanted_pgarr = explode("\n", $wanted); foreach($wanted_pgarr as $line) { list($pgleft, $pgright) = explode(":", $line, 2); $pgleft = trim($pgleft); $pgright = trim($pgright); $pgwanted[$pgleft] = "$pgright"; } foreach($output_pgarr as $line) { list($pgleft, $pgright) = explode(":", $line, 2); $pgleft = trim($pgleft); $pgright = trim($pgright); if (strcmp($pgright, $pgwanted[$pgleft]) !== 0) printf("%-10s: Expected: %-16s Got: %-16s Diff: %s\n", $pgleft, $pgwanted[$pgleft], $pgright, bcsub($pgwant ed[$pgleft], $pgright,12)); } % echo "ext/standard/tests/math/constants.phpt" > pgtest.txt % php run-tests.php -l pgtest.txt Expected result: ---------------- Expected test to PASS Actual result: -------------- Added more code to run-tests.php to report on what was going on and got: M_E : Expected: 2.718281828459 Got: 2.71828182846 Diff: -0.000000000001 M_LOG2E : Expected: 1.442695040889 Got: 1.44269504089 Diff: -0.000000000001 M_LN2 : Expected: 0.693147180559 Got: 0.69314718056 Diff: -0.000000000001 M_LN10 : Expected: 2.302585092994 Got: 2.30258509299 Diff: 0.000000000004 M_PI : Expected: 3.141592653589 Got: 3.14159265359 Diff: -0.000000000001 M_PI_2 : Expected: 1.570796326794 Got: 1.57079632679 Diff: 0.000000000004 M_1_PI : Expected: 0.318309886183 Got: 0.318309886184 Diff: -0.000000000001 M_2_PI : Expected: 0.636619772367 Got: 0.636619772368 Diff: -0.000000000001 M_SQRTPI : Expected: 1.772453850905 Got: 1.77245385091 Diff: -0.000000000005 M_2_SQRTPI: Expected: 1.128379167095 Got: 1.1283791671 Diff: -0.000000000005 M_LNPI : Expected: 1.144729885849 Got: 1.14472988585 Diff: -0.000000000001 M_EULER : Expected: 0.577215664901 Got: 0.577215664902 Diff: -0.000000000001 M_SQRT2 : Expected: 1.414213562373 Got: 1.41421356237 Diff: 0.000000000003 M_SQRT1_2 : Expected: 0.707106781186 Got: 0.707106781187 Diff: -0.000000000001 M_SQRT3 : Expected: 1.732050807568 Got: 1.73205080757 Diff: -0.000000000002 FAIL Math constants [ext/standard/tests/math/constants.phpt] As you can see, we have lost a decimal place of precision. plop:root/p2-/usr/local/src/Web/Apache2_PHP5/php-5.2.0RC5-862#->uname -a 4:38PM FreeBSD plop.pgregg.com 5.5-PRERELEASE FreeBSD 5.5-PRERELEASE #4: Tue Mar 7 13:49:31 GMT 2006 pgregg@plop.pgregg.com:/usr/obj/usr/src/sys/PGREGG_PLOP i386 This test passed ok in 5.2.0RC4 -- Edit bug report at http://bugs.php.net/?id=39097&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=39097&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=39097&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=39097&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=39097&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=39097&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=39097&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=39097&r=needscript Try newer version: http://bugs.php.net/fix.php?id=39097&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=39097&r=support Expected behavior: http://bugs.php.net/fix.php?id=39097&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=39097&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=39097&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=39097&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=39097&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=39097&r=dst IIS Stability: http://bugs.php.net/fix.php?id=39097&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=39097&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=39097&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=39097&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=39097&r=mysqlcfg