|author||aherbert <email@example.com>||Thu Jan 16 15:14:19 2020 +0000|
|committer||aherbert <firstname.lastname@example.org>||Thu Jan 16 15:14:19 2020 +0000|
Change x2y2m1 summation algorithm. This switches from Ogita's dot3 sum to Shewchuk's expansion sum. The number of two sum operations is the same, the order is different. The new version passes the previous strict tests but has a formal proof in Shewchuk's paper. The method from Ogita may be functionally equivalent but has no proof. Thus it may differ in some untested combinations of x and y.
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