================
@@ -145,9 +164,89 @@ namespace {
.addImm(0);
if (IsAIX) {
- // The variable offset and region handle are copied in r4 and r3. The
- // copies are followed by GETtlsADDR32AIX/GETtlsADDR64AIX.
- if (!IsTLSTPRelMI) {
+ if (IsTLSLDAIXMI) {
+ // The relative order between the LoadOffset@toc node, and the
+ // .__tls_get_mod node is being tuned here. It is better to put the
+ // LoadOffset@toc node after the call, since the LoadOffset@toc
node
+ // can use clobbers r4/r5. Search for the pattern of two Load@toc
+ // nodes, and then move the LoadOffset@toc node right before the
+ // node that uses the OutReg of the .__tls_get_mod node.
+ unsigned LDTocOp =
+ Is64Bit ? (IsLargeModel ? PPC::LDtocL : PPC::LDtoc)
+ : (IsLargeModel ? PPC::LWZtocL : PPC::LWZtoc);
+ if (!RegInfo.use_empty(OutReg)) {
+ std::set<MachineInstr *> Uses;
+ // Collect all instructions that use the OutReg.
+ for (MachineOperand &MO : RegInfo.use_operands(OutReg))
+ Uses.insert(MO.getParent());
+ // Find the first user (e.g.: lwax/stfdx) within the current BB.
+ MachineBasicBlock::iterator UseIter = MBB.begin();
+ for (MachineBasicBlock::iterator IE = MBB.end(); UseIter != IE;
+ ++UseIter)
+ if (Uses.count(&*UseIter))
+ break;
+
+ // Got some work to do when UseIter pointing to valid node. Check
+ // the pattern and do the movement if match.
----------------
amy-kwan wrote:
Maybe we can say this? If this is accurate.
```suggestion
// Additional handling is required when UserIter (the first user
of OutReg) is pointing to a valid node. Check
// the pattern and do the movement if the pattern matches.
```
https://github.com/llvm/llvm-project/pull/66316
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