[llvm-branch-commits] [llvm] [AMDGPU] Fix (PR #115505)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Shilei Tian (shiltian)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/115505.diff


1 Files Affected:

- (modified) llvm/lib/Target/AMDGPU/SIFrameLowering.cpp (+10-1) 


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp b/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
index 13a2db7a87b437..8e3208abaec9a5 100644
--- a/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
@@ -59,9 +59,18 @@ static MCRegister findScratchNonCalleeSaveRegister(
   if (Unused)
     return findUnusedRegister(MRI, LiveUnits, RC);
 
+  dbgs() << "--------\n";
+
   for (MCRegister Reg : RC) {
-    if (LiveUnits.available(Reg) && !MRI.isReserved(Reg))
+    dbgs() << "reg " << Reg << " avail? " << LiveUnits.available(Reg)
+           << ", reserved? " << MRI.isReserved(Reg) << "\n";
+  }
+
+  for (MCRegister Reg : RC) {
+    if (LiveUnits.available(Reg) && !MRI.isReserved(Reg)) {
+      dbgs() << "--------choose reg " << Reg << '\n';
       return Reg;
+    }
   }
 
   return MCRegister();

``````````

</details>


https://github.com/llvm/llvm-project/pull/115505