llDumpList2String has changed its behaviour with respect to minus zero. Now it converts -0.0 to a string without the minus sign.
While testing this, we noticed several mismatches in the float to string conversions; the existing routine did not properly convert some values because as we discovered later, it is subject to double rounding; one of them is the built-in round-to-nearest-or-even while getting the first 7 significant digits, and the other is just an increment when the digit is a 5 or more, so round to nearest, ties away from zero, and is performed on the digit past the five or six visible digits that LSL shows.
The new code is a tad easier to understand and more robust.
A first variant of the new code is left commented out for history's sake, and will be removed in the next commit.
This annoyance and discrepancy with LSO was finally fixed by Linden Lab. The change has prompted some modifications to the test suite to accommodate for the new results. A further improvement has been to make these tests more friendly to be run in SL, making it easier to verify the results.
Fixes#17.
Reported by SaladDais@users.noreply.github.com - thanks!
vector * quaternion: Simplified by precalculating the repeated products and removing math.fsum.
quaternion * quaternion: Add more F32's to get a result closer to SL's (still not there, but we're definitively closer now).
We left out quaternion/quaternion in the tests, and the q*q test was not general enough (had many zeros). Remedied that.
The algorithm for adding parentheses around unary operators was not working properly. It converted a * (-b) * c into a * -b * c, which LSL handles as a * -(b * c).
Fix and add test cases for that. One of the test cases shows an example where the difference matters: 0 * (-1e20) * 1e20 should result in 0.0, but if wrongly parenthesized, it gives NaN, because 1e20*1e20 gives infinity due to float overflow, and minus infinity times 0 is indeterminate.
The addition of parentheses has been improved, but it still does not eliminate every redundant parenthesis.
Also fix the horrendous typo of using "operands" where it should be "operators".
This test suite has been in use for a long time now, in place of the obsolete and unmanageable testparser.py and testfuncs.py. It verifies the complete optimizer output to stdout and stderr, to ensure that the output matches the expectations.
See unit_tests/README.txt for more info.
