Fast register pressure tracking currently only takes effect during
bottom up scheduling. Forcing this is a bit faster and simpler for
targets that don't have many scheduling constraints and don't need
top-down scheduling.
llvm-svn: 190014
- Benjamin fixed the emission of this file in r179937, but it still lives on a
few buildbots. We should probably clean up the build dirs once in a while,
eh?
llvm-svn: 188527
The register allocator expects minimal physreg live ranges. Schedule
physreg copies accordingly. This is slightly tricky when they occur in
the middle of the scheduling region. For now, this is handled by
rescheduling the copy when its associated instruction is
scheduled. Eventually we may instead bundle them, but only if we can
preserve the bundles as parallel copies during regalloc.
llvm-svn: 179449
Andrew Trick