[llvm] [RISCV] Implement tail call optimization in machine outliner (PR #115297)

[Craig Topper via llvm-commits]

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@@ -2961,6 +2990,17 @@ RISCVInstrInfo::getOutliningCandidateInfo(
   for (auto &MI : RepeatedSequenceLocs[0])
     SequenceSize += getInstSizeInBytes(MI);
 
+  if (!cannotInsertTailCall(RepeatedSequenceLocs[0].back())) {
+    // tail function = 8 bytes. Can't be compressed
+    for (auto &C : RepeatedSequenceLocs)
+      C.setCallInfo(MachineOutlinerTailCall, 8);
+
+    // Using tail call we move ret instruction from caller to calle.
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topperc wrote:

callee*

https://github.com/llvm/llvm-project/pull/115297