[LLVMdev] Can't use SSE4.2 instructions

[Blind Faith]

Hi,

I'm trying to use the SSE4.2's instruction  _mm_crc32_u64 and also
added -msse4.2 flag in the makefile, but yet I get this error when I try to
compile my code with clang/llvm.

LLVM ERROR: Cannot select: intrinsic %llvm.x86.sse42.crc32.64.64

I also tried to pass -march=native, but still no luck.
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