[doc/sum.txt] Improved an example (from my ARITH-23 slides).

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@10943 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 4 insertions, 3 deletions

diff --git a/doc/sum.txt b/doc/sum.txt
index 06d68f917..e4874ebd1 100644
--- a/doc/sum.txt
+++ b/doc/sum.txt
@@ -594,10 +594,11 @@ and a shift of 26 bits (due to cancellation), here is the accumulator
 before and after the shift:
 
   Before shift: [--------]-----------------------------------]
-                         └─ maxexp                   minexp ─┘
-
+                    cq   ├─ maxexp      sq + dq      minexp ─┤
+                00000000000000000000000000001----------------]
+                <--- identical bits (0) --->
                                     <------- 26 zeros ------->
-  After shift:  [-------------------00000000000000000000000000
+  After shift:  001-----------------00000000000000000000000000
   This iteration:          minexp ─┘   ├─ maxexp2            │
   Next iteration:                      └─ maxexp     minexp ─┘