diff options
| author | aiju <devnull@localhost> | 2018-04-26 14:55:02 +0100 |
|---|---|---|
| committer | aiju <devnull@localhost> | 2018-04-26 14:55:02 +0100 |
| commit | e87ca8d97689ad9a63c0b56d0bfbda00c56abca2 (patch) | |
| tree | ca90c7c69a4f4350e7c5f7db88cd1e22c806e49f /sys/src/libmp | |
| parent | 69298c79ab3da8164f9b5317be4ae1b2a75ab4dd (diff) | |
mpdiv: fix dividing 0 by a small power of two
Diffstat (limited to 'sys/src/libmp')
| -rw-r--r-- | sys/src/libmp/port/mpdiv.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sys/src/libmp/port/mpdiv.c b/sys/src/libmp/port/mpdiv.c index ea68acb43..cfd673cfa 100644 --- a/sys/src/libmp/port/mpdiv.c +++ b/sys/src/libmp/port/mpdiv.c @@ -22,7 +22,9 @@ mpdiv(mpint *dividend, mpint *divisor, mpint *quotient, mpint *remainder) // division by one or small powers of two if(divisor->top == 1 && (divisor->p[0] & divisor->p[0]-1) == 0){ - vlong r = (vlong)dividend->sign * (dividend->p[0] & divisor->p[0]-1); + vlong r = 0; + if(dividend->top > 0) + r = (vlong)dividend->sign * (dividend->p[0] & divisor->p[0]-1); if(quotient != nil){ sign = divisor->sign; for(s = 0; ((divisor->p[0] >> s) & 1) == 0; s++) |