[llvm] [AMDGPU] Fix negative immediate offset for unbuffered smem loads (PR #79553)

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``````````bash
git-clang-format --diff df5e431e8dcb555320be7f7ae4d499a11e0b17db 0880df29da44d70d7cf91edf4df17455ea730f7e -- llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp b/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
index d573143101..d2a1b16581 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
@@ -2141,7 +2141,8 @@ bool AMDGPUDAGToDAGISel::SelectSMRDBaseOffset(SDValue Addr, SDValue &SBase,
 bool AMDGPUDAGToDAGISel::SelectSMRD(SDValue Addr, SDValue &SBase,
                                     SDValue *SOffset, SDValue *Offset,
                                     bool Imm32Only, bool IsPrefetch) const {
-  if (SelectSMRDBaseOffset(Addr, SBase, SOffset, Offset, Imm32Only, IsPrefetch)) {
+  if (SelectSMRDBaseOffset(Addr, SBase, SOffset, Offset, Imm32Only,
+                           IsPrefetch)) {
     SBase = Expand32BitAddress(SBase);
     return true;
   }
@@ -2201,7 +2202,7 @@ bool AMDGPUDAGToDAGISel::SelectSMRDBufferSgprImm(SDValue N, SDValue &SOffset,
 }
 
 bool AMDGPUDAGToDAGISel::SelectSMRDPrefetchImm(SDValue Addr, SDValue &SBase,
-                                       SDValue &Offset) const {
+                                               SDValue &Offset) const {
   return SelectSMRD(Addr, SBase, /* SOffset */ nullptr, &Offset, false, true);
 }
 
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h b/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
index 5328ba9854..24bb9fd905 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
@@ -194,12 +194,12 @@ private:
                         SDValue *Offset, bool Imm32Only = false,
                         bool IsBuffer = false) const;
   SDValue Expand32BitAddress(SDValue Addr) const;
-  bool SelectSMRDBaseOffset(SDValue Addr, SDValue & SBase, SDValue * SOffset,
-                            SDValue * Offset, bool Imm32Only = false,
+  bool SelectSMRDBaseOffset(SDValue Addr, SDValue &SBase, SDValue *SOffset,
+                            SDValue *Offset, bool Imm32Only = false,
                             bool IsBuffer = false, bool IsPrefetch = false,
                             bool HasSOffset = false) const;
-  bool SelectSMRD(SDValue Addr, SDValue & SBase, SDValue * SOffset,
-                  SDValue * Offset, bool Imm32Only = false,
+  bool SelectSMRD(SDValue Addr, SDValue &SBase, SDValue *SOffset,
+                  SDValue *Offset, bool Imm32Only = false,
                   bool IsPrefetch = false) const;
   bool SelectSMRDImm(SDValue Addr, SDValue &SBase, SDValue &Offset) const;
   bool SelectSMRDImm32(SDValue Addr, SDValue &SBase, SDValue &Offset) const;
@@ -210,8 +210,8 @@ private:
   bool SelectSMRDBufferImm32(SDValue N, SDValue &Offset) const;
   bool SelectSMRDBufferSgprImm(SDValue N, SDValue &SOffset,
                                SDValue &Offset) const;
-  bool SelectSMRDPrefetchImm(SDValue Addr, SDValue & SBase, SDValue & Offset)
-      const;
+  bool SelectSMRDPrefetchImm(SDValue Addr, SDValue &SBase,
+                             SDValue &Offset) const;
   bool SelectMOVRELOffset(SDValue Index, SDValue &Base, SDValue &Offset) const;
 
   bool SelectVOP3ModsImpl(SDValue In, SDValue &Src, unsigned &SrcMods,
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
index 573bc9260c..473068e7f6 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
@@ -220,9 +220,8 @@ private:
   InstructionSelector::ComplexRendererFns
   selectVINTERPModsHi(MachineOperand &Root) const;
 
-  bool selectSmrdOffset(MachineOperand & Root, Register & Base,
-                        Register * SOffset, int64_t * Offset,
-                        bool IsPrefetch = false) const;
+  bool selectSmrdOffset(MachineOperand &Root, Register &Base, Register *SOffset,
+                        int64_t *Offset, bool IsPrefetch = false) const;
 
   InstructionSelector::ComplexRendererFns
   selectSmrdImm(MachineOperand &Root) const;

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https://github.com/llvm/llvm-project/pull/79553