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| author | vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4> | 2015-03-12 15:55:11 +0000 |
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| committer | vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4> | 2015-03-12 15:55:11 +0000 |
| commit | ffabfc90b44619dc54593de0bbafb08ccdef7d7e (patch) | |
| tree | 823e38358f1e8791a5e2320c13c70f7da3cde329 /doc | |
| parent | d2e71d9d69af0183a46d567387d72b52b039e14b (diff) | |
| download | mpfr-ffabfc90b44619dc54593de0bbafb08ccdef7d7e.tar.gz | |
[doc/sum.txt] Added a new table concerning the correction term.
[src/sum.c] Updated rounding.
git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/branches/new-sum@9335 280ebfd0-de03-0410-8827-d642c229c3f4
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/sum.txt | 35 |
1 files changed, 33 insertions, 2 deletions
diff --git a/doc/sum.txt b/doc/sum.txt index baca8d577..b51b95456 100644 --- a/doc/sum.txt +++ b/doc/sum.txt @@ -39,8 +39,39 @@ sum_raw (obtained from code refactoring for steps 3 to 6, and 8) should be introduced and described. Pre-rounding in (7) and rounding in (8) have been merged, and this [previously pre-rounding in (7)] is still done at the same time as sign handling with a single mpn operation. -The table concerning the correction term is also incorrect (the initial -truncation also has an influence, but it isn't taken into account yet). +The table concerning the correction term and the ternary value in case +of TMD should be changed to: + + rnd tmd R sst correction ternary + ─────────────────────────────────────────────── + N 1 0 - 0 + + N 1 0 0 0 0 + N 1 0 + 0 - + N 1 1 - +1 + + N 1 1 0 +1 0 + N 1 1 + +1 - + ─────────────────────────────────────────────── + N 2 0 - 0 - + N 2 0 0 ? ? (halfway case) + N 2 0 + +1 + + N 2 1 - 0 - + N 2 1 0 ? ? (halfway case) + N 2 1 + +1 + + ─────────────────────────────────────────────── + D 1 0 - -1 - + D 1 0 0 0 0 + D 1 0 + 0 - + D 1 1 - 0 - + D 1 1 0 +1 0 + D 1 1 + +1 - + ─────────────────────────────────────────────── + U 1 0 - 0 + + U 1 0 0 0 0 + U 1 0 + +1 + + U 1 1 - +1 + + U 1 1 0 +1 0 + U 1 1 + +2 + + ─────────────────────────────────────────────── The general ideas of the algorithm: |