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From: "djohnson at osc dot edu" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug libc/13926] New: __bswap_64 in bits/byeswap.h only usable by gcc
Date: Wed, 28 Mar 2012 13:49:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=13926

             Bug #: 13926
           Summary: __bswap_64 in bits/byeswap.h only usable by gcc
           Product: glibc
           Version: 2.15
            Status: NEW
          Severity: minor
          Priority: P3
         Component: libc
        AssignedTo: unassigned@sourceware.org
        ReportedBy: djohnson@osc.edu
                CC: drepper.fsp@gmail.com
    Classification: Unclassified


Hi,

I've found what I believe is a bug in the bits/byteswap.h file, and the defines
that control whether masks/shifts or gcc inline assembly are used to implement
the byte swap.  The 16 and 32 bits swaps are compatible with non-gcc compilers,
but the 64 bit swap can never be defined for a non-gcc compiler.  See attached
patch for what I think the defines should look like (untested patch.)

Doug

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