[PATCH] D11463: [AArch64] Define subtarget feature "reserve-x18"

[Akira Hatanaka]

ahatanak added a comment.

According to the original email, the option was added because they wanted to reserve x18 for free bsd kernel but not didn't want to do so for userland programs. They wanted an option to reserve register x18, which is normally not reserved.

http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20150119/121916.html


http://reviews.llvm.org/D11463