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c9165a5a41
This changes the ABI used on 32-bit x86 for passing vector arguments. Historically, clang passes the first 4 vector arguments in-register, and additional vector arguments on the stack, regardless of platform. That is different from the behavior of gcc, icc, and msvc, all of which pass only the first 3 arguments in-register. The 3-register convention is documented, unofficially, in Agner's calling convention guide, and, officially, in the recently released version 1.0 of the i386 psABI. Darwin is kept as is because the OS X ABI Function Call Guide explicitly documents the current (4-register) behavior. This fixes PR21510 Differential revision: http://reviews.llvm.org/D9644 llvm-svn: 237682 |
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