Allow targets to expand COPY and other standard pseudo-instructions
before they are expanded with copyPhysReg().
This allows the target to examine the COPY instruction for extra
operands indicating it can be widened to a preferable super-register
copy. See the ARM -widen-vmovs option.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141578 91177308-0d34-0410-b5e6-96231b3b80d8
Many targets use pseudo instructions to help register allocation. Like
the COPY instruction, these pseudos can be expanded after register
allocation. The early expansion can make life easier for PEI and the
post-ra scheduler.
This patch adds a hook that is called for all remaining pseudo
instructions from the ExpandPostRAPseudos pass.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140472 91177308-0d34-0410-b5e6-96231b3b80d8
I'll fix the file contents in the next commit.
This pass is currently expanding the COPY and SUBREG_TO_REG pseudos. I
am going to add a hook so targets can expand more pseudo-instructions
after register allocation.
Many targets have pseudo-instructions that assist the register
allocator. They can be expanded after register allocation, before PEI
and PostRA scheduling.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140469 91177308-0d34-0410-b5e6-96231b3b80d8
