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fd975f75fa
compiler: add simd_ctpop intrinsic Fairly straightforward addition. cc `@rust-lang/opsem` new (extremely boring) intrinsic
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.