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| author | Marco Bodrato <bodrato@mail.dm.unipi.it> | 2012-02-24 17:40:57 +0100 |
|---|---|---|
| committer | Marco Bodrato <bodrato@mail.dm.unipi.it> | 2012-02-24 17:40:57 +0100 |
| commit | bef2a8f26b2b42fe2be47c34d472435117bae9ac (patch) | |
| tree | 1b5817c93f1f44e37484a6f48dc5c0b47f8514d4 /mpz/invert.c | |
| parent | 20816efe8a2c6127c7d3acda57d8485448bfbe10 (diff) | |
| download | gmp-bef2a8f26b2b42fe2be47c34d472435117bae9ac.tar.gz | |
mpz_invert: return 0 (no-inverse) when modulus is zero.
Diffstat (limited to 'mpz/invert.c')
| -rw-r--r-- | mpz/invert.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mpz/invert.c b/mpz/invert.c index 3a32b4c91..ec2e1184a 100644 --- a/mpz/invert.c +++ b/mpz/invert.c @@ -34,8 +34,8 @@ mpz_invert (mpz_ptr inverse, mpz_srcptr x, mpz_srcptr n) nsize = ABSIZ (n); /* No inverse exists if the leftside operand is 0. Likewise, no - inverse exists if the mod operand is 1. */ - if (xsize == 0 || (nsize == 1 && (PTR (n))[0] == 1)) + inverse exists if the mod operand is 1 or 0. */ + if (xsize == 0 || nsize == 0 || (nsize == 1 && (PTR (n))[0] == 1)) return 0; size = MAX (xsize, nsize) + 1; |