[LLVMbugs] [Bug 313] NEW: [x86] JIT miscompiles unsigned short to floating point

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=313

           Summary: [x86] JIT miscompiles unsigned short to floating point
           Product: libraries
           Version: 1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: X86 Backend
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sabre at nondot.org


Wow, this bug has been here for a LONG time.  This is causing cfrac to fail with
the JIT, and maybe 'ed' as well.

The problem is that the X86 backend is emitting a movzx instruction from 8 to 16
bits instead of 16 to 32 bits.  Because it puts the right registers into the
instruction, LLC works fine (one movzx is the same as another movzx), but the
encoding of the instructions are different, so it fails in the JIT.

-Chris



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