[LLVMbugs] [Bug 3462] New: missing 128bit intrinsic on x86-64

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Mon Feb 2 11:42:36 PST 2009


           Summary: missing 128bit intrinsic on x86-64
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: missing-feature
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: krox at gmx.net
                CC: llvmbugs at cs.uiuc.edu

the intrinsic "llvm.atomic.cmp.swap.i128.p0i128" is not implemented, although
the architecture is capable of it. The asm-instruction is "cmpxchg16b" and
needs to be handled a litte different than the normal "cmpxchg" instruction for
shorter operands, cause it uses register pairs.

probably, the same is true for the 64bit intrinsic on x86 ("cmpxchg8b")

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