[llvm] unpack packed instructions overlapped by MFMAs post-RA scheduling (PR #157968)

[Jeffrey Byrnes via llvm-commits]

================
@@ -417,6 +454,281 @@ bool SIPreEmitPeephole::removeExeczBranch(MachineInstr &MI,
   return true;
 }
 
+// If support is extended to new operations, add tests in
+// llvm/test/CodeGen/AMDGPU/unpack-non-coissue-insts-post-ra-scheduler.mir.
+bool SIPreEmitPeephole::isUnpackingSupportedInstr(MachineInstr &MI) const {
+  unsigned Opcode = MI.getOpcode();
+  if (!TII->isNeverCoissue(MI))
----------------
jrbyrnes wrote:

Move to beginning of function.

https://github.com/llvm/llvm-project/pull/157968