Dan Gohman f166d2d0d6 Implement an x86-64 ABI detail of passing structs by hidden first ...

argument. The x86-64 ABI requires the incoming value of %rdi to
be copied to %rax on exit from a function that is returning a
large C struct.

Also, add a README-X86-64 entry detailing the missed optimization
opportunity and proposing an alternative approach.

llvm-svn: 50075

2008-04-21 23:59:07 +00:00

4.1 KiB

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