[LLVMbugs] [Bug 937] NEW: SelectionDAGLowering does not support frndint instruction (in inline asm)

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=937

           Summary: SelectionDAGLowering does not support frndint
                    instruction (in inline asm)
           Product: libraries
           Version: trunk
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: pmeredit at uiuc.edu


The problem is that frndint casts the top of the 8087 floating point stack to 
an integer.  I have been told the SelectionDAGLowering does not support the 
8087 stack.  This is fairly serious because frndint is included in math.h's 
floor function, via inclusion through the system specific mathinlines.h.  Thus, 
any program that uses floor (from math.h) on an x86 platform will crash during 
native codegen or JIT'ing.



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