[llvm] [AMDGPU] Remove dead handling of S_SETPC_B64 (PR #71275)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Stanislav Mekhanoshin (rampitec)

<details>
<summary>Changes</summary>

At the very least there are no tests covering this. Nothing breaks when I remove it.

---
Full diff: https://github.com/llvm/llvm-project/pull/71275.diff


1 Files Affected:

- (modified) llvm/lib/Target/AMDGPU/SIInstrInfo.cpp (-6) 


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp b/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
index d73328d67f6078e..41e53e81046fef1 100644
--- a/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
@@ -2776,12 +2776,6 @@ bool SIInstrInfo::isBranchOffsetInRange(unsigned BranchOp,
 
 MachineBasicBlock *SIInstrInfo::getBranchDestBlock(
   const MachineInstr &MI) const {
-  if (MI.getOpcode() == AMDGPU::S_SETPC_B64) {
-    // This would be a difficult analysis to perform, but can always be legal so
-    // there's no need to analyze it.
-    return nullptr;
-  }
-
   return MI.getOperand(0).getMBB();
 }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/71275