And assign RegClass (i.e. operand class for all GPR) as the super class
of ARegClass and DRegClass. Note that this is a NFC change because
actually we already had XRDReg to model either address or data register
operands (as well as test coverage for it). The new super class syntax
added here is just making the relations between three RegClass-es more
explicit.
Previously ADD & ADDA (as well as SUB & SUBA) instructions are mixed
together, which not only violated Motorola assembly's syntax but also
made asm parsing more difficult. This patch separates these two kinds of
instructions migrate rest of the tests from
test/CodeGen/M68k/Encoding/Arithmetic to test/MC/M68k/Arithmetic.
Note that we observed minor regressions on codegen quality: Sometimes
isel uses ADD instead of ADDA even the latter can lead to shorter
sequence of code. This issue implies that some isel patterns might need
to be updated.
Adjust sanity check in register parsing function to allow register
name with more than 2 characters (e.g. ccr).
Differential Revision: https://reviews.llvm.org/D101733
M68kAsmParser uses `llvm::getTheM68kTarget` from M68kInfo, therefore we
should put M68kInfo as its direct dependency. Otherwise the build will
fail when building LLVM libraries as shared objects (building LLVM
libraries statically won't have this problem though).
This is a work-in-progress implementation of an assembler for M68k.
Outstanding work:
- Updating existing tests assembly syntax
- Writing new tests for the assembler (and disassembler)
I've left those until there's consensus that this approach is okay (I hope that's okay!).
Questions I'm aware of:
- Should this use Motorola or gas syntax? (At the moment it uses Motorola syntax.)
- The disassembler produces a table at runtime for disassembly generated from the code beads. Is this okay? (This is less than ideal but as I mentioned in my llvm-dev post, it's quite complicated to write a table-gen parser for code beads.)
Depends on D98519
Depends on D98532
Depends on D98534
Depends on D98535
Depends on D98536
Differential Revision: https://reviews.llvm.org/D98537
Min-Yih Hsu