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Delyan Kratunov reported an issue where __builtin_memcmp is not inlined into simple load/compare instructions. This is a known issue. In the current state, __builtin_memcmp will be converted to memcmp call which won't work for bpf programs. This patch added support for expanding __builtin_memcmp with actual loads and compares up to currently maximum 128 total loads. The implementation is identical to PowerPC. Differential Revision: https://reviews.llvm.org/D122676
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