The following GCC intrinsics are not available on MIPS32:
__sync_fetch_and_add_8
__sync_fetch_and_and_8
__sync_fetch_and_or_8
__sync_val_compare_and_swap_8
Replace these with appropriate libatomic implementation.
Patch by Miodrag Dinic.
Differential Revision: https://reviews.llvm.org/D45691
llvm-svn: 355687
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