[llvm] [SPARC] Fix-forward #154950 by returning true if SP::V8BAR if handled (PR #162424)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-sparc

Author: Thurston Dang (thurstond)

<details>
<summary>Changes</summary>

Buildbot report: https://lab.llvm.org/buildbot/#/builders/24/builds/13433

Use-after-poison happens because after SP::V8BAR is handled, it erases MI, which should thereafter not be inspected by ExpandPostRA::run.

---
Full diff: https://github.com/llvm/llvm-project/pull/162424.diff


1 Files Affected:

- (modified) llvm/lib/Target/Sparc/SparcInstrInfo.cpp (+1) 


``````````diff
diff --git a/llvm/lib/Target/Sparc/SparcInstrInfo.cpp b/llvm/lib/Target/Sparc/SparcInstrInfo.cpp
index c0cd0176efa30..f66eb9dbee2dc 100644
--- a/llvm/lib/Target/Sparc/SparcInstrInfo.cpp
+++ b/llvm/lib/Target/Sparc/SparcInstrInfo.cpp
@@ -668,6 +668,7 @@ bool SparcInstrInfo::expandPostRAPseudo(MachineInstr &MI) const {
              .addImm(-1);
     MIBundleBuilder(MBB, InstSTBAR, InstLDSTUB);
     MBB.erase(MI);
+    return true;
   }
   }
   return false;

``````````

</details>


https://github.com/llvm/llvm-project/pull/162424