diff options
Diffstat (limited to 'toolchain/musl/patches/055-fix-strtod-int-optimization-in-non-nearest-rounding-mode.patch')
| -rw-r--r-- | toolchain/musl/patches/055-fix-strtod-int-optimization-in-non-nearest-rounding-mode.patch | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/toolchain/musl/patches/055-fix-strtod-int-optimization-in-non-nearest-rounding-mode.patch b/toolchain/musl/patches/055-fix-strtod-int-optimization-in-non-nearest-rounding-mode.patch new file mode 100644 index 0000000000..1588b14658 --- /dev/null +++ b/toolchain/musl/patches/055-fix-strtod-int-optimization-in-non-nearest-rounding-mode.patch @@ -0,0 +1,38 @@ +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 |