[llvm] [SPARC] Prevent RESTORE from sourcing from %o7 in call delay slots (PR #172593)

[via llvm-commits]

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@@ -442,6 +461,20 @@ static bool combineRestoreOR(MachineBasicBlock::iterator RestoreMI,
       && (!OrMI->getOperand(2).isImm() || OrMI->getOperand(2).getImm() != 0))
     return false;
 
+  // Check whether it uses %o7 as its source and the corresponding branch
+  // instruction is a call.
+  MachineBasicBlock::iterator LastInst = MBB.getFirstTerminator();
+  bool IsCall = LastInst != MBB.end() && LastInst->isCall();
+
+  if (IsCall && OrMI->getOpcode() == SP::ORrr &&
+      (OrMI->getOperand(1).getReg() == SP::O7 ||
+       OrMI->getOperand(2).getReg() == SP::O7))
+    return false;
+
+  if (IsCall && OrMI->getOpcode() == SP::ORrr &&
+      OrMI->getOperand(1).getReg() == SP::O7)
+    return false;
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koachan wrote:

Ah yeah, that should be ORri.

https://github.com/llvm/llvm-project/pull/172593