Instead of holding a mask, hold two value: the start index and the
length of the mapping. This is a more compact representation, although
less powerful. That being said, arbitrary masks would not have worked
for the generic so do not allow them in the first place.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267025 91177308-0d34-0410-b5e6-96231b3b80d8
Although repairing definitions is not mandatory for correctness (only
phis would be impacted because of the RPO traversal), not repairing
might go against the cost model. Therefore, just repair when it is
possible.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266025 91177308-0d34-0410-b5e6-96231b3b80d8
When assigning the register banks of an instruction, it is best to know
all the constraints of the input to have a good idea of how this will
impact the cost of the whole function.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265812 91177308-0d34-0410-b5e6-96231b3b80d8
Add verbose information when checking if the current and the desired
register banks match.
Detail what happens when we assign a register bank.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265804 91177308-0d34-0410-b5e6-96231b3b80d8
from a register.
On top of duplicating the logic, it was buggy! It would assert on
physical registers, since MachineRegisterInfo does not have any
information regarding register classes/banks for them.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265727 91177308-0d34-0410-b5e6-96231b3b80d8
The pass walk through the machine function and assign the register banks
using the default mapping. In other words, there is no attempt to reduce
cross register copies.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265707 91177308-0d34-0410-b5e6-96231b3b80d8
