Introduces the AddrFI "addressing mode", which is necessary simply because
it's not possible to write a pattern that directly matches a frameindex.
Ensure callee-saved registers are accessed relative to the stackpointer. This
is necessary as callee-saved register spills are performed before the frame
pointer is set.
Move HexagonDAGToDAGISel::isOrEquivalentToAdd to SelectionDAGISel, so we can
make use of it in the RISC-V backend.
Differential Revision: https://reviews.llvm.org/D39848
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320353 91177308-0d34-0410-b5e6-96231b3b80d8
As pointed out in post-commit review of r318738, `return ReplaceNode(..)` when
both ReplaceNode and the current function return void is confusing. This patch
moves to using a more obvious early return, and moves to just using an if to
catch the one case we currently care about. A future patch that adds further
custom instruction selection can introduce a switch.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@318757 91177308-0d34-0410-b5e6-96231b3b80d8
The obvious approach of defining a pattern like the one below actually doesn't
work:
`def : Pat<(i32 0), (i32 X0)>;`
As was noted when Lanai made this change (https://reviews.llvm.org/rL288215),
attempting to handle the constant 0 in tablegen leads to assertions due to a
physical register being used where a virtual register is expected.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@318738 91177308-0d34-0410-b5e6-96231b3b80d8
Alex Bradbury