From 6ffdc4579ffb34f4aab69ab4c081badabc7c0a9a Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Sun, 4 Sep 2016 04:51:03 +0200 Subject: [PATCH] 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. --- src/internal/floatscan.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) 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; -- 2.25.1