[LLVMbugs] [Bug 11212] New: X86AsmBackend::WriteNopData uses long nops unconditionally

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11212

           Summary: X86AsmBackend::WriteNopData uses long nops
                    unconditionally
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: rdivacky at freebsd.org
                CC: llvmbugs at cs.uiuc.edu


X86AsmBackend::WriteNopData() uses long NOP encodings unconditionally resulting
in illegal instructions being executed on CPUs that dont support these
encodings (ie. Amd Geode). We need to check for the target CPU.

According to http://www.tortall.net/projects/yasm/manual/html/arch-x86.html we
should even differentiate between amd and intel. Gnu as uses different nops on
different cpus too.

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