[LLVMbugs] [Bug 12249] New: Invalid endianness

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12249

             Bug #: 12249
           Summary: Invalid endianness
           Product: clang
           Version: 3.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: hranac.bz at email.cz
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Clang doesn't support big endian at all.

== Reproduction ==

The following input program:

struct {
  unsigned a: 4;
  unsigned b: 4;
} U = {3,5};

int main()
{
  return 0;
}

will produce the following .ll file for a 16-bit architecture (regardless of
the endianness):

%struct.anon = type { i8, i8 }

@U = global %struct.anon { i8 53, i8 undef }, align 2

define i16 @main() nounwind {
entry:
  %retval = alloca i16, align 2
  store i16 0, i16* %retval
  ret i16 0
}

==========================

Obviously, this is correct only for little-endian. Big-endian should have the
initialization reversed ( %struct.anon { i8 undef, i8 53 } ).

This matter has been reported at least two years ago already.

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