[llvm] [AMDGPU] Remove dead code in SIISelLowering (NFC) (PR #108198)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Nicolas Miller (npmiller)

<details>
<summary>Changes</summary>

This return is dead code as the return just above will always be taken.

---
Full diff: https://github.com/llvm/llvm-project/pull/108198.diff


1 Files Affected:

- (modified) llvm/lib/Target/AMDGPU/SIISelLowering.cpp (-3) 


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
index 736f714ac1a77c..fb553314919096 100644
--- a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
@@ -16207,9 +16207,6 @@ SITargetLowering::shouldExpandAtomicRMWInIR(AtomicRMWInst *RMW) const {
     return isAtomicRMWLegalXChgTy(RMW)
                ? TargetLowering::AtomicExpansionKind::None
                : TargetLowering::AtomicExpansionKind::CmpXChg;
-
-    // PCIe supports add and xchg for system atomics.
-    return atomicSupportedIfLegalIntType(RMW);
   }
   case AtomicRMWInst::Add:
   case AtomicRMWInst::And:

``````````

</details>


https://github.com/llvm/llvm-project/pull/108198