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39 lines
1.2 KiB
39 lines
1.2 KiB
8 years ago
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From 6ffdc4579ffb34f4aab69ab4c081badabc7c0a9a Mon Sep 17 00:00:00 2001
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From: Szabolcs Nagy <nsz@port70.net>
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Date: Sun, 4 Sep 2016 04:51:03 +0200
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Subject: fix strtod int optimization in non-nearest rounding mode
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the mid-sized integer optimization relies on lnz set up properly
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to mark the last non-zero decimal digit, but this was not done
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if the non-zero digit lied outside the KMAX digits of the base
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10^9 number representation.
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so if the fractional part was a very long list of zeros (>2048*9 on
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x86) followed by non-zero digits then the integer optimization could
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kick in discarding the tiny non-zero fraction which can mean wrong
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result on non-nearest rounding mode.
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strtof, strtod and strtold were all affected.
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---
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src/internal/floatscan.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/src/internal/floatscan.c b/src/internal/floatscan.c
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index 80305ee..ae09852 100644
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--- a/src/internal/floatscan.c
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+++ b/src/internal/floatscan.c
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@@ -110,7 +110,10 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
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gotdig=1;
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} else {
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dc++;
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- if (c!='0') x[KMAX-4] |= 1;
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+ if (c!='0') {
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+ lnz = (KMAX-4)*9;
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+ x[KMAX-4] |= 1;
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+ }
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}
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}
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if (!gotrad) lrp=dc;
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--
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cgit v0.11.2
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