[llvm] [M68k] allow 16-bit registers for MOVE to/from CCR (PR #107591)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-m68k

Author: Janis Heims (TechnoElf)

<details>
<summary>Changes</summary>

Fixes #<!-- -->106210.

---
Full diff: https://github.com/llvm/llvm-project/pull/107591.diff


1 Files Affected:

- (modified) llvm/lib/Target/M68k/M68kInstrInfo.cpp (+12-6) 


``````````diff
diff --git a/llvm/lib/Target/M68k/M68kInstrInfo.cpp b/llvm/lib/Target/M68k/M68kInstrInfo.cpp
index 23c5c76a47479b..8704d64ca17a36 100644
--- a/llvm/lib/Target/M68k/M68kInstrInfo.cpp
+++ b/llvm/lib/Target/M68k/M68kInstrInfo.cpp
@@ -709,13 +709,19 @@ void M68kInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
   bool ToSR = DstReg == M68k::SR;
 
   if (FromCCR) {
-    assert(M68k::DR8RegClass.contains(DstReg) &&
-           "Need DR8 register to copy CCR");
-    Opc = M68k::MOV8dc;
+    if (M68k::DR8RegClass.contains(DstReg))
+      Opc = M68k::MOV8dc;
+    else if (M68k::DR16RegClass.contains(DstReg))
+      Opc = M68k::MOV16dc;
+    else
+      llvm_unreachable("Invalid register for MOVE from CCR");
   } else if (ToCCR) {
-    assert(M68k::DR8RegClass.contains(SrcReg) &&
-           "Need DR8 register to copy CCR");
-    Opc = M68k::MOV8cd;
+    if (M68k::DR8RegClass.contains(SrcReg))
+      Opc = M68k::MOV8cd;
+    else if (M68k::DR16RegClass.contains(SrcReg))
+      Opc = M68k::MOV16cd;
+    else
+      llvm_unreachable("Invalid register for MOVE to CCR");
   } else if (FromSR || ToSR)
     llvm_unreachable("Cannot emit SR copy instruction");
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/107591