[LLVMbugs] [Bug 400] NEW: Add support to LLVM for alignment specification of memory objects

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=400

           Summary: Add support to LLVM for alignment specification of
                    memory objects
           Product: libraries
           Version: 1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Core LLVM classes
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sabre at nondot.org


Also, the alloca and malloc instructions should take an optional alignment
argument, and GlobalValues should allow an explicit alignment constraint to be set.

For malloc, this allows us to represent valloc and memalign directly
in LLVM.  For alloca, it allows us to support the alignment attributes in the
GCC front-end directly.  Global variables should also be extended to support
alignment attributes.  This will be required for vectorization work.

If an alignment is specified as zero, the default, then that means we should
follow the target alignment settings.  This should be _by far_ the most common
setting, so we should not even bother encoding this argument into the bytecode
file unless it is nonzero.

This was originally a comment in Bug 122, but it should be it's own bug, so I'm
splitting it out.

-Chris



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