[M68k] Add basic floating point infrastructures

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[M68k] Add basic floating point infrastructures #61802

Open mshockwave opened 1 year ago

mshockwave commented 1 year ago

Including

Subtarget feature
Register definitions
One of the basic instructions, like FMOVE, and its MC support.

We need at least one instruction to test the first two items. We can start with just implementing asm printing / parsing then add instruction encoding later.

llvmbot commented 1 year ago

@llvm/issue-subscribers-backend-m68k

mshockwave commented 1 year ago

Candidate patches:

https://reviews.llvm.org/D147479
https://reviews.llvm.org/D147480