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| author | Szabolcs Nagy <nsz@port70.net> | 2016-09-04 04:51:03 +0200 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2016-10-20 13:29:34 -0400 |
| commit | 6ffdc4579ffb34f4aab69ab4c081badabc7c0a9a (patch) | |
| tree | 1ad511f097d1d0d999b2f9377b5027c99886ef7d | |
| parent | d184a09e0529f33d8ddddb8825039133483a2c41 (diff) | |
| download | musl-6ffdc4579ffb34f4aab69ab4c081badabc7c0a9a.tar.gz musl-6ffdc4579ffb34f4aab69ab4c081badabc7c0a9a.tar.bz2 musl-6ffdc4579ffb34f4aab69ab4c081badabc7c0a9a.tar.xz musl-6ffdc4579ffb34f4aab69ab4c081badabc7c0a9a.zip | |
fix strtod int optimization in non-nearest rounding mode
the mid-sized integer optimization relies on lnz set up properly
to mark the last non-zero decimal digit, but this was not done
if the non-zero digit lied outside the KMAX digits of the base
10^9 number representation.
so if the fractional part was a very long list of zeros (>2048*9 on
x86) followed by non-zero digits then the integer optimization could
kick in discarding the tiny non-zero fraction which can mean wrong
result on non-nearest rounding mode.
strtof, strtod and strtold were all affected.
| -rw-r--r-- | src/internal/floatscan.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/internal/floatscan.c b/src/internal/floatscan.c index 80305ee6..ae098526 100644 --- a/src/internal/floatscan.c +++ b/src/internal/floatscan.c @@ -110,7 +110,10 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po gotdig=1; } else { dc++; - if (c!='0') x[KMAX-4] |= 1; + if (c!='0') { + lnz = dc; + x[KMAX-4] |= 1; + } } } if (!gotrad) lrp=dc; |