[LLVMbugs] [Bug 17029] New: add support for AMD TBM instructions

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17029

            Bug ID: 17029
           Summary: add support for AMD TBM instructions
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: kkhoo at perfwizard.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

An even more efficient codegen solution to bug 17028 is to use the "bextr"
instruction that takes an immediate rather than a register. This instruction is
available on AMD chips such as Bulldozer, ver2 that implement "TBM". However,
it doesn't appear that a "HasTBM" CPU feature is implemented in LLVM as of
r189409.

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