[LLVMbugs] [Bug 17481] New: add __sync_val_compare_and_swap_16

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17481

            Bug ID: 17481
           Summary: add __sync_val_compare_and_swap_16
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: nlewycky at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Compiling this with clang (on a cpu type with the cmpxchg16b feature disabled):

int main(void) { __int128_t a, b, c; __sync_val_compare_and_swap(&a, b, c); }

won me this:

Unexpected value type for atomic!
UNREACHABLE executed at LegalizeIntegerTypes.cpp:1201!
[...]
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module '-'.
4.      Running pass 'X86 DAG->DAG Instruction Selection' on function '@main'
clang: error: unable to execute command: Aborted (core dumped)

GCC emits a call to __sync_val_compare_and_swap_16.

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