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Previously I tried to plug musttail into the existing vararg lowering code. That turned out to be a mistake, because non-vararg calls use significantly different register lowering, even on x86. For example, AVX vectors are usually passed in registers to normal functions and memory to vararg functions. Now musttail uses a completely separate lowering. Hopefully this can be used as the basis for non-x86 perfect forwarding. Reviewers: majnemer Differential Revision: http://reviews.llvm.org/D6156 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224745 91177308-0d34-0410-b5e6-96231b3b80d8
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