[LLVMbugs] [Bug 14367] New: [NVPTX] Expose DriverInterface setting to subtarget arguments

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14367

             Bug #: 14367
           Summary: [NVPTX] Expose DriverInterface setting to subtarget
                    arguments
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: maemarcus at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


NVPTX backend has an option to switch between NVCL, CUDA and TEST driver
interfaces. But this setting can only be configured over command line:

cl::opt<NVPTX::DrvInterface>
DriverInterface(cl::desc("Choose driver interface:"),
                cl::values(
                    clEnumValN(NVPTX::NVCL, "drvnvcl", "Nvidia OpenCL driver"),
                    clEnumValN(NVPTX::CUDA, "drvcuda", "Nvidia CUDA driver"),
                    clEnumValN(NVPTX::TEST, "drvtest", "Plain Test"),
                    clEnumValEnd),
                    cl::init(NVPTX::NVCL));
}

At KernelGen we invoke backend using TargetMachine interface, i.e. bypassing
command line and need to use CUDA interface (because it's the one not adding
texmode_independent PTX option). It would be nice to extend the current
target/subtarget argument list to have an ability to select Driver Interface
from there.

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