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From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug math/15490] New: nearbyint scheduling for spurious exceptions
Date: Sun, 19 May 2013 18:10:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=15490

             Bug #: 15490
           Summary: nearbyint scheduling for spurious exceptions
           Product: glibc
           Version: 2.17
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jsm28@gcc.gnu.org
    Classification: Unclassified


Code in the C nearbyintf and possibly other nearbyint implementations can be
scheduled by the compiler so arithmetic that raises the "inexact" exception
runs after the fesetenv intended to clear that exception.

http://sourceware.org/ml/libc-alpha/2013-05/msg00720.html

gives an example I can reproduce on x86_64 with --disable-multi-arch (otherwise
the SSE4.1 version gets used).

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