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2 Commits

Author SHA1 Message Date
Saleem Abdulrasool
2e0d72311b X86: remove R12 from CSR on Windows x64 SwiftCC 
R12 is used for the SwiftError parameter.  It is no longer a CSR as it
is used for transfer the SwiftError, and the caller must preserve it if
they need to.

llvm-svn: 314165
 2017-09-25 22:00:17 +00:00
Saleem Abdulrasool
432b88e5f4 CodeGen: support SwiftError SwiftCC on Windows x64 
Add support for passing SwiftError through a register on the Windows x64
calling convention.  This allows the use of swifterror attributes on
parameters which is used by the swift front end for the `Error`
parameter.  This partially enables building the swift standard library
for Windows x86_64.

llvm-svn: 313791
 2017-09-20 18:40:59 +00:00