[llvm-bugs] [Bug 30471] New: Power 128bit atomics support

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30471

            Bug ID: 30471
           Summary: Power 128bit atomics support
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: v.churavy at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Right now a 
    atomicrmw xchg i128* %2, i128 13 acq_rel 
get's lowered to 
    __sync_lock_test_and_set_16

This is problematic to handle for JIT compilers since the family of `__sync`
libcalls are implemented as builtins in clang and gcc. (I have not found a
library that implements them). I am seeking guidance on how a JIT frontend is
supposed to handle the `__sync` libcalls.

Alternatively llvm needs to lower 128bit atomics to the corresponding
definitions in libatomic/compiler-rt (which happens in most other cases.)

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