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70c96c7b55
The nest attribute is currently supported on the x86 (32-bit) and x86-64 backends, but not on ARM (32-bit) or AArch64. This patch adds support for nest to the AArch64 backend. Register x18 is used by GCC for this purpose and hence is used here. As discussed on the GCC mailing list the register choice is an ABI issue and so choosing the same register as GCC means __builtin_call_with_static_chain is compatible. Patch by Stephen Cross. llvm-svn: 241794
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