2912f9f2a2
Backport most important fixes up to latest HEAD - Taken post-commit reverts/fixes into account Compile tested Run-tested on cns3xxx & imx6 targets Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
39 lines
1.2 KiB
Diff
39 lines
1.2 KiB
Diff
From 6ffdc4579ffb34f4aab69ab4c081badabc7c0a9a Mon Sep 17 00:00:00 2001
|
|
From: Szabolcs Nagy <nsz@port70.net>
|
|
Date: Sun, 4 Sep 2016 04:51:03 +0200
|
|
Subject: 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 80305ee..ae09852 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 = (KMAX-4)*9;
|
|
+ x[KMAX-4] |= 1;
|
|
+ }
|
|
}
|
|
}
|
|
if (!gotrad) lrp=dc;
|
|
--
|
|
cgit v0.11.2
|