[llvm] [M68k] implement move to and from sr (PR #111145)

[Sergei Barannikov via llvm-commits]

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@@ -434,6 +436,64 @@ foreach AM = MxMoveSupportedAMs in {
 def MOV16dc : MxMoveFromCCR_R;
 def MOV8dc  : MxMoveFromCCRPseudo<MxOp8AddrMode_d.Op>;
 
+/// Move to SR
+/// --------------------------------------------------
+///  F  E  D  C  B  A  9  8  7  6 | 5  4  3 | 2  1  0
+/// --------------------------------------------------
+///                               | EFFECTIVE ADDRESS
+///  0  1  0  0  0  1  1  0  1  1 |   MODE  |   REG
+/// --------------------------------------------------
+let Defs = [SR] in {
+class MxMoveToSR<MxOperand MEMOp, MxEncMemOp SRC_ENC>
+    : MxInst<(outs SRC:$dst), (ins MEMOp:$src), "move.w\t$src, $dst", []> {
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s-barannikov wrote:

If this defines SR implicitly, should `outs` be empty? Same for SR uses and CCR uses/defs.
`$dst` in the asm astring should be `SR` then.


https://github.com/llvm/llvm-project/pull/111145