[Bug math/16447] erfc (0x6.a8p+4) ldbl-128 throws underflow exception

["stli at linux dot vnet.ibm.com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16447

--- Comment #3 from Stefan Liebler <stli at linux dot vnet.ibm.com> ---
I´ve posted a patch for the exp testcase (expl(-11342.8125)).
I´ve also tested a wider unsafe-check:
unsafe = abs(n_i) >= -16363; 
//unsafe = abs(n_i) >= -LDBL_MIN_EXP - 1;
Then the testcase passes on S/390.
LDBL_MIN_EXP expands to -16381 on S/390.

A small test on S/390 shows that 
expl(-11341.99999L) works as expected, but with
expl(-11341.999999L) the result is same as expl(-11342.8125).
In both cases n_i == -16363.

How to handle the unsafe-check?
Which platform uses this implementation of expl?
Can we simply change the unsafe-check in sysdeps/iee754 or is a new
platform-specific implementation required?

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From: "carlos at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug network/16529] netinet/in.h breaks -pedantic
Date: Thu, 06 Feb 2014 16:07:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id\x16529

Carlos O'Donell <carlos at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |carlos at redhat dot com

--- Comment #4 from Carlos O'Donell <carlos at redhat dot com> ---
This bug is my mistake. I'll remove the trailing comma which is only valid C99.

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