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This is a Microsoft calling convention that supports both x86 and x86_64 subtargets. It passes vector and floating point arguments in XMM0-XMM5, and passes them indirectly once they are consumed. Homogenous vector aggregates of up to four elements can be passed in sequential vector registers, but this part is not implemented in LLVM and will be handled in Clang. On 32-bit x86, it is similar to fastcall in that it uses ecx:edx as integer register parameters and is callee cleanup. On x86_64, it delegates to the normal win64 calling convention. Reviewers: majnemer Differential Revision: http://reviews.llvm.org/D5943 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220745 91177308-0d34-0410-b5e6-96231b3b80d8 |
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