MIRParser: Use dot instead of colon to mark subregisters
Change the syntax to use `%0.sub8` to denote a subregister.
This seems like a more natural fit to denote subregisters; I also plan
to introduce a new ":classname" syntax in upcoming patches to denote the
register class of a vreg.
Note that this commit disallows plain identifiers to start with a '.'
character. This shouldn't affect anything as external names/IR
references are all prefixed with '$'/'%', plain identifiers are only
used for instruction names, register mask names and subreg indexes.
Differential Revision: https://reviews.llvm.org/D22390
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276815 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed