AMDGPU/SI: Teach SIInstrInfo::FoldImmediate() to fold immediates into copies
Summary:
I put this code here, because I want to re-use it in a few other places.
This supersedes some of the immediate folding code we have in SIFoldOperands.
I think the peephole optimizers is probably a better place for folding
immediates into copies, since it does some register coalescing in the same time.
This will also make it easier to transition SIFoldOperands into a smarter pass,
where it looks at all uses of instruction at once to determine the optimal way to
fold operands. Right now, the pass just considers one operand at a time.
Reviewers: arsenm
Subscribers: wdng, nhaehnle, arsenm, llvm-commits, kzhuravl
Differential Revision: https://reviews.llvm.org/D23402
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280744 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed