>>> On Mon, 13 Aug 2018 at 19:46, Duncan Roe <duncan_...@optusnet.com.au> wrote:
>>>>
>>>> On Mon, Aug 13, 2018 at 12:52:48PM -0400, Stephen John Smoogen wrote:
>>>> > On Mon, 13 Aug 2018 at 11:16, Masamichi Hosoda <truer...@trueroad.jp>
>>>> > wrote:
>>>> [...]
>>>> > On Fedora 27 with 7.3.1 it gives
>>>> > ```
>>>> > stod ("nan") = nan
>>>> > stod ("-nan") = nan
>>>> > quiet_NaN () = nan
>>>> > ```
[...]
>> Cygwin 2.10.0 64 bit with gcc 7.3.0
>> ```
>> strtod ("nan", NULL) = -nan
>> strtod ("-nan", NULL) = nan
>> nan ("") = nan
>> ```
>>
>> Ubuntu 16.04 LTS 64 bit with gcc 5.4.0
>> ```
>> strtod ("nan", NULL) = nan
>> strtod ("-nan", NULL) = nan
>> nan ("") = nan
>> ```
I've created the quick hack patch that fixes `strtod ()`.
On Cygwin 64 bit with the patch, result of foobar.c:
```
strtod ("nan", NULL) = nan
strtod ("-nan", NULL) = nan
nan ("") = nan
```
Also result of foobar.cc:
```
stod ("nan") = nan
stod ("-nan") = nan
quiet_NaN () = nan
```
>From a50ee5a4747a99c70469a53fe959f3dc22d3b79a Mon Sep 17 00:00:00 2001
From: Masamichi Hosoda <truer...@trueroad.jp>
Date: Tue, 14 Aug 2018 12:50:32 +0900
Subject: [PATCH] Fix strtod ("nan") returns qNaN
The definition of qNaN for x86_64 and x86 was wrong.
So strtod ("nan") returned sNaN instead of qNaN.
Furthermore, it was inverted the sign bit with the presence of `-` character.
So strtod ("-nan") returned qNaN.
This commit fixes definition of qNaN
and removes the sign bit inversion when evaluating "nan".
---
newlib/libc/stdlib/gd_qnan.h | 8 ++++----
newlib/libc/stdlib/strtod.c | 1 +
2 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/newlib/libc/stdlib/gd_qnan.h b/newlib/libc/stdlib/gd_qnan.h
index b775f82..3ca337b 100644
--- a/newlib/libc/stdlib/gd_qnan.h
+++ b/newlib/libc/stdlib/gd_qnan.h
@@ -26,18 +26,18 @@
#elif defined(__IEEE_LITTLE_ENDIAN)
#if !defined(__mips)
-#define f_QNAN 0xffc00000
+#define f_QNAN 0x7fc00000
#define d_QNAN0 0x0
-#define d_QNAN1 0xfff80000
+#define d_QNAN1 0x7ff80000
#define ld_QNAN0 0x0
#define ld_QNAN1 0xc0000000
-#define ld_QNAN2 0xffff
+#define ld_QNAN2 0x7fff
#define ld_QNAN3 0x0
#define ldus_QNAN0 0x0
#define ldus_QNAN1 0x0
#define ldus_QNAN2 0x0
#define ldus_QNAN3 0xc000
-#define ldus_QNAN4 0xffff
+#define ldus_QNAN4 0x7fff
#elif defined(__mips_nan2008)
#define f_QNAN 0x7fc00000
#define d_QNAN0 0x0
diff --git a/newlib/libc/stdlib/strtod.c b/newlib/libc/stdlib/strtod.c
index 0cfa9e6..3b9fd26 100644
--- a/newlib/libc/stdlib/strtod.c
+++ b/newlib/libc/stdlib/strtod.c
@@ -451,6 +451,7 @@ _strtod_l (struct _reent *ptr, const char *__restrict s00, char **__restrict se,
#ifndef No_Hex_NaN
}
#endif
+ sign = 0;
goto ret;
}
}
--
2.17.0
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