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Summary: We previously made the change to make the GPU target use builtin implementations of memory copy functions. However, this had the negative effect of massively increasing register usages when using the printing interface. For example, a `printf` call went from using 25 VGPRs to 54 simply because of using the builtin. However, we probably want to still export the builitin, but for the RPC interface we heavily prefer small resource usage over the performance gains of fully unrolling this loop. For NVPTX however, the builtin implementation causes the resource usage to go down (36 registers total for a regular `fputs` call) so we will maintain that implementation. I think specializing this is the right call as we will always prefer the implementation with the smallest resource footprint for this interface, as performance is already going to be heavily bottlenecked by the use of fine-grained memory.
LLVM libc ========= This directory and its subdirectories contain source code for llvm-libc, a retargetable implementation of the C standard library. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.