[LLVMbugs] [Bug 19428] New: intrinsic function __sync_lock_test_and_set does not generate code for int128

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Apr 14 16:55:28 PDT 2014


            Bug ID: 19428
           Summary: intrinsic function __sync_lock_test_and_set does not
                    generate code for int128
           Product: clang
           Version: 3.4
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: pw at padd.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Test case:

__int128 tas128(volatile __int128 *ptr, __int128 new_value)
    return __sync_lock_test_and_set(ptr, new_value);

clang -mcx16 atomic.c && nm atomic.o

Shows undefined external symbol for __sync_lock_test_and_set_16

Same code with int64_t works fine; inline code for
__sync_lock_test_and_set_8 is generated.

On gcc-4.8, the 128-bit atomic operation does generate assembly
to use cmpxchg16b as hoped.

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