[Bug 1001643] New: better solution for strict aliasing in libm

[Bug 1001643] New: better solution for strict aliasing in libm

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           Summary: better solution for strict aliasing in libm
           Product: eCos
           Version: CVS
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: low
         Component: Math library
        AssignedTo: unassigned@bugs.ecos.sourceware.org
        ReportedBy: bernd.edlinger@hotmail.de
                CC: ecos-bugs@ecos.sourceware.org
             Class: Advice Request


Created an attachment (id=1865)
 --> (http://bugs.ecos.sourceware.org/attachment.cgi?id=1865)
Proposed patch to make the code compliant to the strict aliasing rules.

The macros CYG_LIBM_HI/LO are fundamentally against the strict aliasing rules.
Therefore, the libm is compiled with -fno-strict-aliasing, but this results
in a slightly less optimal code generation.

This can be improved, if these macros are true functions, using a cast thru
union technique. However some 20 places, where the result of these macros
are on the left hand side of an assignment, must be rewritten too.

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[Bug 1001643] New: better solution for strict aliasing in libm

[bugzilla-daemon]

Please do not reply to this email. Use the web interface provided at:
http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001643

           Summary: better solution for strict aliasing in libm
           Product: eCos
           Version: CVS
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: low
         Component: Math library
        AssignedTo: unassigned@bugs.ecos.sourceware.org
        ReportedBy: bernd.edlinger@hotmail.de
                CC: ecos-bugs@ecos.sourceware.org
             Class: Advice Request


Created an attachment (id=1865)
 --> (http://bugs.ecos.sourceware.org/attachment.cgi?id=1865)
Proposed patch to make the code compliant to the strict aliasing rules.

The macros CYG_LIBM_HI/LO are fundamentally against the strict aliasing rules.
Therefore, the libm is compiled with -fno-strict-aliasing, but this results
in a slightly less optimal code generation.

This can be improved, if these macros are true functions, using a cast thru
union technique. However some 20 places, where the result of these macros
are on the left hand side of an assignment, must be rewritten too.

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