Move the logic to constraint register from InstructionSelector to a
utility function. It will be required by other passes in the GlobalISel
pipeline.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290374 91177308-0d34-0410-b5e6-96231b3b80d8
Add the minimal support necessary to select a function that returns the sum of
two i32 values.
This includes some support for argument/return lowering of i32 values through
registers, as well as the handling of copy and add instructions throughout the
GlobalISel pipeline.
Differential Revision: https://reviews.llvm.org/D26677
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289940 91177308-0d34-0410-b5e6-96231b3b80d8
Mostly straightforward as we ignore addressing modes and just
use the base + unsigned immediate offset (always 0) variants.
This currently fails to select extloads because we have yet to
agree on a representation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277171 91177308-0d34-0410-b5e6-96231b3b80d8
