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| author | zimmerma <zimmerma@280ebfd0-de03-0410-8827-d642c229c3f4> | 2018-08-30 10:56:29 +0000 |
|---|---|---|
| committer | zimmerma <zimmerma@280ebfd0-de03-0410-8827-d642c229c3f4> | 2018-08-30 10:56:29 +0000 |
| commit | 897225abf723fce41c5962c899c67bda1a86f7a4 (patch) | |
| tree | dc75cc64b09cff5364ec969fe1b866c45d245ec4 | |
| parent | 59a92e8c68511f5a09c8011cef08e6a292114467 (diff) | |
| download | mpfr-897225abf723fce41c5962c899c67bda1a86f7a4.tar.gz | |
[mpfr-gmp.h] added comment
git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@13080 280ebfd0-de03-0410-8827-d642c229c3f4
| -rw-r--r-- | src/mpfr-gmp.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/mpfr-gmp.h b/src/mpfr-gmp.h index 581beb62e..06a787d2b 100644 --- a/src/mpfr-gmp.h +++ b/src/mpfr-gmp.h @@ -413,7 +413,10 @@ __MPFR_DECLSPEC void mpfr_tmp_free (struct tmp_marker *); } while (0) #endif -/* invert_pi1 macro adapted from GMP 5 */ +/* invert_pi1 macro adapted from GMP 5, this computes in (dinv).inv32 + the value of floor((beta^3 - 1)/(d1*beta+d0)) - beta, + cf "Improved Division by Invariant Integers" by Niels Möller and + Torbjörn Granlund */ typedef struct {mp_limb_t inv32;} mpfr_pi1_t; #ifndef invert_pi1 #define invert_pi1(dinv, d1, d0) \ |