This patch is the first of two patches which adds support for Multiprecision arithmetic to clang via builtins. This specific patch contains the addition builtins. I will send the other once I get this one in.
*NOTE* In case you are wondering I am also preparing patches for LLVM to perform the proper optimizations in the backend to turn this into the SDNodes addc/adde/subc/sube so a chain of these builtins are lowered properly. Please Review! Michael
0001-Added-builtins-for-multiprecision-adds.patch
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