AMDGPU: Support atomicrmw uinc_wrap/udec_wrap

[arsenm]

Summary

For now keep the exising intrinsics working.

[arsenm]

Rebase

[arsenm]

ping

[nhaehnle]

LGTM

[arsenm]

93ec3fa4021d7080ff4e1d1eb2f36997ebd2f86c

llvm/lib/Target/AMDGPU/AMDGPUGISel.td

 def : GINodeEquiv<G_AMDGPU_BUFFER_STORE_SHORT, SIbuffer_store_short>;
 def : GINodeEquiv<G_AMDGPU_BUFFER_STORE_BYTE, SIbuffer_store_byte>;
 def : GINodeEquiv<G_AMDGPU_BUFFER_STORE_FORMAT, SIbuffer_store_format>;
 def : GINodeEquiv<G_AMDGPU_BUFFER_STORE_FORMAT_D16, SIbuffer_store_format_d16>;
 def : GINodeEquiv<G_AMDGPU_TBUFFER_STORE_FORMAT, SItbuffer_store>;
 def : GINodeEquiv<G_AMDGPU_TBUFFER_STORE_FORMAT_D16, SItbuffer_store_d16>;
 
 // FIXME: Check MMO is atomic
-def : GINodeEquiv<G_AMDGPU_ATOMIC_INC, SIatomic_inc>;
-def : GINodeEquiv<G_AMDGPU_ATOMIC_DEC, SIatomic_dec>;
-def : GINodeEquiv<G_AMDGPU_ATOMIC_INC, atomic_inc_glue>;
-def : GINodeEquiv<G_AMDGPU_ATOMIC_DEC, atomic_dec_glue>;
+def : GINodeEquiv<G_ATOMICRMW_INC, atomic_load_inc_glue>;
+def : GINodeEquiv<G_ATOMICRMW_DEC, atomic_load_dec_glue>;
 def : GINodeEquiv<G_AMDGPU_ATOMIC_FMIN, SIatomic_fmin>;
 def : GINodeEquiv<G_AMDGPU_ATOMIC_FMAX, SIatomic_fmax>;
 def : GINodeEquiv<G_AMDGPU_ATOMIC_FMIN, atomic_load_fmin_glue>;
 def : GINodeEquiv<G_AMDGPU_ATOMIC_FMAX, atomic_load_fmax_glue>;
 
 
 def : GINodeEquiv<G_AMDGPU_BUFFER_ATOMIC_SWAP, SIbuffer_atomic_swap>;
 def : GINodeEquiv<G_AMDGPU_BUFFER_ATOMIC_ADD, SIbuffer_atomic_add>;

llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp

void AMDGPUDAGToDAGISel::Select(SDNode *N) {
   if (N->isMachineOpcode()) {
     N->setNodeId(-1);
     return;   // Already selected.
   }
 
   // isa<MemSDNode> almost works but is slightly too permissive for some DS
   // intrinsics.
   if (Opc == ISD::LOAD || Opc == ISD::STORE || isa<AtomicSDNode>(N) ||
-      (Opc == AMDGPUISD::ATOMIC_INC || Opc == AMDGPUISD::ATOMIC_DEC ||
-       Opc == ISD::ATOMIC_LOAD_FADD ||
-       Opc == AMDGPUISD::ATOMIC_LOAD_FMIN ||
-       Opc == AMDGPUISD::ATOMIC_LOAD_FMAX)) {
+      Opc == AMDGPUISD::ATOMIC_LOAD_FMAX) {
     N = glueCopyToM0LDSInit(N);
     SelectCode(N);
     return;
   }
 
   switch (Opc) {
   default:
     break;

llvm/lib/Target/AMDGPU/AMDGPUISelLowering.h

enum NodeType : unsigned {
   STORE_MSKOR,
   LOAD_CONSTANT,
   TBUFFER_STORE_FORMAT,
   TBUFFER_STORE_FORMAT_D16,
   TBUFFER_LOAD_FORMAT,
   TBUFFER_LOAD_FORMAT_D16,
   DS_ORDERED_COUNT,
   ATOMIC_CMP_SWAP,
-  ATOMIC_INC,
-  ATOMIC_DEC,
   ATOMIC_LOAD_FMIN,
   ATOMIC_LOAD_FMAX,
   BUFFER_LOAD,
   BUFFER_LOAD_UBYTE,
   BUFFER_LOAD_USHORT,
   BUFFER_LOAD_BYTE,
   BUFFER_LOAD_SHORT,
   BUFFER_LOAD_FORMAT,

llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp

const char* AMDGPUTargetLowering::getTargetNodeName(unsigned Opcode) const {
   NODE_NAME_CASE(STORE_MSKOR)
   NODE_NAME_CASE(LOAD_CONSTANT)
   NODE_NAME_CASE(TBUFFER_STORE_FORMAT)
   NODE_NAME_CASE(TBUFFER_STORE_FORMAT_D16)
   NODE_NAME_CASE(TBUFFER_LOAD_FORMAT)
   NODE_NAME_CASE(TBUFFER_LOAD_FORMAT_D16)
   NODE_NAME_CASE(DS_ORDERED_COUNT)
   NODE_NAME_CASE(ATOMIC_CMP_SWAP)
-  NODE_NAME_CASE(ATOMIC_INC)
-  NODE_NAME_CASE(ATOMIC_DEC)
   NODE_NAME_CASE(ATOMIC_LOAD_FMIN)
   NODE_NAME_CASE(ATOMIC_LOAD_FMAX)
   NODE_NAME_CASE(BUFFER_LOAD)
   NODE_NAME_CASE(BUFFER_LOAD_UBYTE)
   NODE_NAME_CASE(BUFFER_LOAD_USHORT)
   NODE_NAME_CASE(BUFFER_LOAD_BYTE)
   NODE_NAME_CASE(BUFFER_LOAD_SHORT)
   NODE_NAME_CASE(BUFFER_LOAD_FORMAT)

llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp

bool AMDGPUInstructionSelector::select(MachineInstr &I) {
   case TargetOpcode::G_ATOMICRMW_SUB:
   case TargetOpcode::G_ATOMICRMW_AND:
   case TargetOpcode::G_ATOMICRMW_OR:
   case TargetOpcode::G_ATOMICRMW_XOR:
   case TargetOpcode::G_ATOMICRMW_MIN:
   case TargetOpcode::G_ATOMICRMW_MAX:
   case TargetOpcode::G_ATOMICRMW_UMIN:
   case TargetOpcode::G_ATOMICRMW_UMAX:
+  case TargetOpcode::G_ATOMICRMW_INC:
+  case TargetOpcode::G_ATOMICRMW_DEC:
   case TargetOpcode::G_ATOMICRMW_FADD:
-  case AMDGPU::G_AMDGPU_ATOMIC_INC:
-  case AMDGPU::G_AMDGPU_ATOMIC_DEC:
   case AMDGPU::G_AMDGPU_ATOMIC_FMIN:
   case AMDGPU::G_AMDGPU_ATOMIC_FMAX:
     return selectG_LOAD_STORE_ATOMICRMW(I);
   case TargetOpcode::G_SELECT:
     return selectG_SELECT(I);
   case TargetOpcode::G_TRUNC:
     return selectG_TRUNC(I);
   case TargetOpcode::G_SEXT:

llvm/lib/Target/AMDGPU/AMDGPUInstructions.td

 defm atomic_load_max : binary_atomic_op_all_as<atomic_load_max>;
 defm atomic_load_min : binary_atomic_op_all_as<atomic_load_min>;
 defm atomic_load_or : binary_atomic_op_all_as<atomic_load_or>;
 defm atomic_load_sub : binary_atomic_op_all_as<atomic_load_sub>;
 defm atomic_load_umax : binary_atomic_op_all_as<atomic_load_umax>;
 defm atomic_load_umin : binary_atomic_op_all_as<atomic_load_umin>;
 defm atomic_load_xor : binary_atomic_op_all_as<atomic_load_xor>;
 defm atomic_load_fadd : binary_atomic_op_all_as<atomic_load_fadd, 0>;
+defm atomic_load_inc : binary_atomic_op_all_as<atomic_load_inc>;
+defm atomic_load_dec : binary_atomic_op_all_as<atomic_load_dec>;
 let MemoryVT = v2f16 in
 defm atomic_load_fadd_v2f16 : binary_atomic_op_all_as<atomic_load_fadd, 0>;
 defm AMDGPUatomic_cmp_swap : binary_atomic_op_all_as<AMDGPUatomic_cmp_swap>;
 
 def load_align8_local : PatFrag<(ops node:$ptr), (load_local node:$ptr)>,
                        Aligned<8> {
   let IsLoad = 1;
 }

llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp

AMDGPULegalizerInfo::AMDGPULegalizerInfo(const GCNSubtarget &ST_,
   ExtLoads.clampScalar(0, S32, S32)
           .widenScalarToNextPow2(0)
           .lower();
 
   auto &Atomics = getActionDefinitionsBuilder(
     {G_ATOMICRMW_XCHG, G_ATOMICRMW_ADD, G_ATOMICRMW_SUB,
      G_ATOMICRMW_AND, G_ATOMICRMW_OR, G_ATOMICRMW_XOR,
      G_ATOMICRMW_MAX, G_ATOMICRMW_MIN, G_ATOMICRMW_UMAX,
-     G_ATOMICRMW_UMIN})
+     G_ATOMICRMW_UMIN, G_ATOMICRMW_INC, G_ATOMICRMW_DEC})
     .legalFor({{S32, GlobalPtr}, {S32, LocalPtr},
                {S64, GlobalPtr}, {S64, LocalPtr},
                {S32, RegionPtr}, {S64, RegionPtr}});
   if (ST.hasFlatAddressSpace()) {
     Atomics.legalFor({{S32, FlatPtr}, {S64, FlatPtr}});
   }
 
   auto &Atomic = getActionDefinitionsBuilder(G_ATOMICRMW_FADD);
bool AMDGPULegalizerInfo::legalizeBufferLoad(MachineInstr &MI,
 
   MI.eraseFromParent();
   return true;
 }
 
 bool AMDGPULegalizerInfo::legalizeAtomicIncDec(MachineInstr &MI,
                                                MachineIRBuilder &B,
                                                bool IsInc) const {
-  unsigned Opc = IsInc ? AMDGPU::G_AMDGPU_ATOMIC_INC :
-                         AMDGPU::G_AMDGPU_ATOMIC_DEC;
+  unsigned Opc = IsInc ? AMDGPU::G_ATOMICRMW_INC :
+                         AMDGPU::G_ATOMICRMW_DEC;
   B.buildInstr(Opc)
     .addDef(MI.getOperand(0).getReg())
     .addUse(MI.getOperand(2).getReg())
     .addUse(MI.getOperand(3).getReg())
     .cloneMemRefs(MI);
   MI.eraseFromParent();
   return true;
 }

llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp

   case AMDGPU::G_ATOMICRMW_AND:
   case AMDGPU::G_ATOMICRMW_OR:
   case AMDGPU::G_ATOMICRMW_XOR:
   case AMDGPU::G_ATOMICRMW_MAX:
   case AMDGPU::G_ATOMICRMW_MIN:
   case AMDGPU::G_ATOMICRMW_UMAX:
   case AMDGPU::G_ATOMICRMW_UMIN:
   case AMDGPU::G_ATOMICRMW_FADD:
+  case AMDGPU::G_ATOMICRMW_INC:
+  case AMDGPU::G_ATOMICRMW_DEC:
   case AMDGPU::G_AMDGPU_ATOMIC_CMPXCHG:
-  case AMDGPU::G_AMDGPU_ATOMIC_INC:
-  case AMDGPU::G_AMDGPU_ATOMIC_DEC:
   case AMDGPU::G_AMDGPU_ATOMIC_FMIN:
   case AMDGPU::G_AMDGPU_ATOMIC_FMAX: {
     OpdsMapping[0] = getVGPROpMapping(MI.getOperand(0).getReg(), MRI, *TRI);
     OpdsMapping[1] = getValueMappingForPtr(MRI, MI.getOperand(1).getReg());
     OpdsMapping[2] = getVGPROpMapping(MI.getOperand(2).getReg(), MRI, *TRI);
     break;
   }
   case AMDGPU::G_ATOMIC_CMPXCHG: {

llvm/lib/Target/AMDGPU/BUFInstructions.td

 defm : BufferAtomicPat<"atomic_load_sub_global", Ty, "BUFFER_ATOMIC_SUB" # Suffix>;
 defm : BufferAtomicPat<"atomic_load_min_global", Ty, "BUFFER_ATOMIC_SMIN" # Suffix>;
 defm : BufferAtomicPat<"atomic_load_umin_global", Ty, "BUFFER_ATOMIC_UMIN" # Suffix>;
 defm : BufferAtomicPat<"atomic_load_max_global", Ty, "BUFFER_ATOMIC_SMAX" # Suffix>;
 defm : BufferAtomicPat<"atomic_load_umax_global", Ty, "BUFFER_ATOMIC_UMAX" # Suffix>;
 defm : BufferAtomicPat<"atomic_load_and_global", Ty, "BUFFER_ATOMIC_AND" # Suffix>;
 defm : BufferAtomicPat<"atomic_load_or_global", Ty, "BUFFER_ATOMIC_OR" # Suffix>;
 defm : BufferAtomicPat<"atomic_load_xor_global", Ty, "BUFFER_ATOMIC_XOR" # Suffix>;
-defm : BufferAtomicPat<"atomic_inc_global", Ty, "BUFFER_ATOMIC_INC" # Suffix>;
-defm : BufferAtomicPat<"atomic_dec_global", Ty, "BUFFER_ATOMIC_DEC" # Suffix>;
+defm : BufferAtomicPat<"atomic_load_inc_global", Ty, "BUFFER_ATOMIC_INC" # Suffix>;
+defm : BufferAtomicPat<"atomic_load_dec_global", Ty, "BUFFER_ATOMIC_DEC" # Suffix>;
 
 } // end foreach Ty
 
 defm : BufferAtomicCmpSwapPat<i32, v2i32, "BUFFER_ATOMIC_CMPSWAP">;
 defm : BufferAtomicCmpSwapPat<i64, v2i64, "BUFFER_ATOMIC_CMPSWAP_X2">;
 
 multiclass SIBufferAtomicPat<string OpPrefix, ValueType vt, string Inst,
                              list<string> RtnModes = ["ret", "noret"]> {

llvm/lib/Target/AMDGPU/DSInstructions.td

def : DSAtomicCmpXChg<noRetInst, vt, !cast<PatFrag>(frag#"_region_m0_noret_"#vt.Size),
                         /* complexity */ 1, /* gds */ 1>;
 }
 } // End SubtargetPredicate = isGFX11Plus
 
 // 32-bit atomics.
 defm : DSAtomicRetPat_mc<DS_WRXCHG_RTN_B32, i32, "atomic_swap">;
 defm : DSAtomicRetNoRetPat_mc<DS_ADD_RTN_U32, DS_ADD_U32, i32, "atomic_load_add">;
 defm : DSAtomicRetNoRetPat_mc<DS_SUB_RTN_U32, DS_SUB_U32, i32, "atomic_load_sub">;
-defm : DSAtomicRetNoRetPat_mc<DS_INC_RTN_U32, DS_INC_U32, i32, "atomic_inc">;
-defm : DSAtomicRetNoRetPat_mc<DS_DEC_RTN_U32, DS_DEC_U32, i32, "atomic_dec">;
+defm : DSAtomicRetNoRetPat_mc<DS_INC_RTN_U32, DS_INC_U32, i32, "atomic_load_inc">;
+defm : DSAtomicRetNoRetPat_mc<DS_DEC_RTN_U32, DS_DEC_U32, i32, "atomic_load_dec">;
 defm : DSAtomicRetNoRetPat_mc<DS_AND_RTN_B32, DS_AND_B32, i32, "atomic_load_and">;
 defm : DSAtomicRetNoRetPat_mc<DS_OR_RTN_B32, DS_OR_B32, i32, "atomic_load_or">;
 defm : DSAtomicRetNoRetPat_mc<DS_XOR_RTN_B32, DS_XOR_B32, i32, "atomic_load_xor">;
 defm : DSAtomicRetNoRetPat_mc<DS_MIN_RTN_I32, DS_MIN_I32, i32, "atomic_load_min">;
 defm : DSAtomicRetNoRetPat_mc<DS_MAX_RTN_I32, DS_MAX_I32, i32, "atomic_load_max">;
 defm : DSAtomicRetNoRetPat_mc<DS_MIN_RTN_U32, DS_MIN_U32, i32, "atomic_load_umin">;
 defm : DSAtomicRetNoRetPat_mc<DS_MAX_RTN_U32, DS_MAX_U32, i32, "atomic_load_umax">;
 defm : DSAtomicRetNoRetPat_mc<DS_MIN_RTN_F32, DS_MIN_F32, f32, "atomic_load_fmin">;

 let SubtargetPredicate = HasLDSFPAtomicAdd in {
 defm : DSAtomicRetNoRetPat_mc<DS_ADD_RTN_F32, DS_ADD_F32, f32, "atomic_load_fadd">;
 }
 
 // 64-bit atomics.
 defm : DSAtomicRetPat_mc<DS_WRXCHG_RTN_B64, i64, "atomic_swap">;
 defm : DSAtomicRetNoRetPat_mc<DS_ADD_RTN_U64, DS_ADD_U64, i64, "atomic_load_add">;
 defm : DSAtomicRetNoRetPat_mc<DS_SUB_RTN_U64, DS_SUB_U64, i64, "atomic_load_sub">;
-defm : DSAtomicRetNoRetPat_mc<DS_INC_RTN_U64, DS_INC_U64, i64, "atomic_inc">;
-defm : DSAtomicRetNoRetPat_mc<DS_DEC_RTN_U64, DS_DEC_U64, i64, "atomic_dec">;
+defm : DSAtomicRetNoRetPat_mc<DS_INC_RTN_U64, DS_INC_U64, i64, "atomic_load_inc">;
+defm : DSAtomicRetNoRetPat_mc<DS_DEC_RTN_U64, DS_DEC_U64, i64, "atomic_load_dec">;
 defm : DSAtomicRetNoRetPat_mc<DS_AND_RTN_B64, DS_AND_B64, i64, "atomic_load_and">;
 defm : DSAtomicRetNoRetPat_mc<DS_OR_RTN_B64, DS_OR_B64, i64, "atomic_load_or">;
 defm : DSAtomicRetNoRetPat_mc<DS_XOR_RTN_B64, DS_XOR_B64, i64, "atomic_load_xor">;
 defm : DSAtomicRetNoRetPat_mc<DS_MIN_RTN_I64, DS_MIN_I64, i64, "atomic_load_min">;
 defm : DSAtomicRetNoRetPat_mc<DS_MAX_RTN_I64, DS_MAX_I64, i64, "atomic_load_max">;
 defm : DSAtomicRetNoRetPat_mc<DS_MIN_RTN_U64, DS_MIN_U64, i64, "atomic_load_umin">;
 defm : DSAtomicRetNoRetPat_mc<DS_MAX_RTN_U64, DS_MAX_U64, i64, "atomic_load_umax">;
 defm : DSAtomicRetNoRetPat_mc<DS_MIN_RTN_F64, DS_MIN_F64, f64, "atomic_load_fmin">;

llvm/lib/Target/AMDGPU/EvergreenInstructions.td

 defm AtomicUMaxPat : AtomicPat <RAT_ATOMIC_MAX_UINT_NORET,
                                 atomic_load_umax_global_noret_32>;
 defm AtomicAndPat : AtomicPat <RAT_ATOMIC_AND_NORET,
                                atomic_load_and_global_noret_32>;
 defm AtomicOrPat : AtomicPat <RAT_ATOMIC_OR_NORET,
                               atomic_load_or_global_noret_32>;
 defm AtomicXorPat : AtomicPat <RAT_ATOMIC_XOR_NORET,
                                atomic_load_xor_global_noret_32>;
+
+// FIXME: These are broken
 defm AtomicIncAddPat : AtomicIncDecPat <RAT_ATOMIC_INC_UINT_NORET,
                                         atomic_load_add_global_noret_32, 1>;
 defm AtomicIncSubPat : AtomicIncDecPat <RAT_ATOMIC_INC_UINT_NORET,
                                         atomic_load_sub_global_noret_32, -1>;
 defm AtomicDecAddPat : AtomicIncDecPat <RAT_ATOMIC_DEC_UINT_NORET,
                                         atomic_load_add_global_noret_32, -1>;
 defm AtomicDecSubPat : AtomicIncDecPat <RAT_ATOMIC_DEC_UINT_NORET,
                                         atomic_load_sub_global_noret_32, 1>;

llvm/lib/Target/AMDGPU/FLATInstructions.td

 def : FlatStoreAtomicPat <FLAT_STORE_BYTE, atomic_store_8_flat, i32>;
 def : FlatStoreAtomicPat <FLAT_STORE_BYTE, atomic_store_8_flat, i16>;
 def : FlatStoreAtomicPat <FLAT_STORE_SHORT, atomic_store_16_flat, i32>;
 def : FlatStoreAtomicPat <FLAT_STORE_SHORT, atomic_store_16_flat, i16>;
 
 foreach as = [ "flat", "global" ] in {
 defm : FlatAtomicPat <"FLAT_ATOMIC_ADD", "atomic_load_add_"#as, i32>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_SUB", "atomic_load_sub_"#as, i32>;
-defm : FlatAtomicPat <"FLAT_ATOMIC_INC", "atomic_inc_"#as, i32>;
-defm : FlatAtomicPat <"FLAT_ATOMIC_DEC", "atomic_dec_"#as, i32>;
+defm : FlatAtomicPat <"FLAT_ATOMIC_INC", "atomic_load_inc_"#as, i32>;
+defm : FlatAtomicPat <"FLAT_ATOMIC_DEC", "atomic_load_dec_"#as, i32>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_AND", "atomic_load_and_"#as, i32>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_SMAX", "atomic_load_max_"#as, i32>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_UMAX", "atomic_load_umax_"#as, i32>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_SMIN", "atomic_load_min_"#as, i32>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_UMIN", "atomic_load_umin_"#as, i32>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_OR", "atomic_load_or_"#as, i32>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_SWAP", "atomic_swap_"#as, i32>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_CMPSWAP", "AMDGPUatomic_cmp_swap_"#as, i32, v2i32>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_XOR", "atomic_load_xor_"#as, i32>;
 
 defm : FlatAtomicPat <"FLAT_ATOMIC_ADD_X2", "atomic_load_add_"#as, i64>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_SUB_X2", "atomic_load_sub_"#as, i64>;
-defm : FlatAtomicPat <"FLAT_ATOMIC_INC_X2", "atomic_inc_"#as, i64>;
-defm : FlatAtomicPat <"FLAT_ATOMIC_DEC_X2", "atomic_dec_"#as, i64>;
+defm : FlatAtomicPat <"FLAT_ATOMIC_INC_X2", "atomic_load_inc_"#as, i64>;
+defm : FlatAtomicPat <"FLAT_ATOMIC_DEC_X2", "atomic_load_dec_"#as, i64>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_AND_X2", "atomic_load_and_"#as, i64>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_SMAX_X2", "atomic_load_max_"#as, i64>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_UMAX_X2", "atomic_load_umax_"#as, i64>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_SMIN_X2", "atomic_load_min_"#as, i64>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_UMIN_X2", "atomic_load_umin_"#as, i64>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_OR_X2", "atomic_load_or_"#as, i64>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_SWAP_X2", "atomic_swap_"#as, i64>;
 defm : FlatAtomicPat <"FLAT_ATOMIC_CMPSWAP_X2", "AMDGPUatomic_cmp_swap_"#as, i64, v2i64>;

 defm : GlobalFLATAtomicStorePats <GLOBAL_STORE_BYTE, atomic_store_8_global, i16>;
 defm : GlobalFLATAtomicStorePats <GLOBAL_STORE_SHORT, atomic_store_16_global, i32>;
 defm : GlobalFLATAtomicStorePats <GLOBAL_STORE_SHORT, atomic_store_16_global, i16>;
 defm : GlobalFLATAtomicStorePats <GLOBAL_STORE_DWORD, atomic_store_32_global, i32>;
 defm : GlobalFLATAtomicStorePats <GLOBAL_STORE_DWORDX2, atomic_store_64_global, i64>;
 
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_ADD", "atomic_load_add_global", i32>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_SUB", "atomic_load_sub_global", i32>;
-defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_INC", "atomic_inc_global", i32>;
-defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_DEC", "atomic_dec_global", i32>;
+defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_INC", "atomic_load_inc_global", i32>;
+defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_DEC", "atomic_load_dec_global", i32>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_AND", "atomic_load_and_global", i32>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_SMAX", "atomic_load_max_global", i32>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_UMAX", "atomic_load_umax_global", i32>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_SMIN", "atomic_load_min_global", i32>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_UMIN", "atomic_load_umin_global", i32>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_OR", "atomic_load_or_global", i32>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_SWAP", "atomic_swap_global", i32>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_CMPSWAP", "AMDGPUatomic_cmp_swap_global", i32, v2i32>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_XOR", "atomic_load_xor_global", i32>;
 defm : GlobalFLATAtomicPatsRtn <"GLOBAL_ATOMIC_CSUB", "int_amdgcn_global_atomic_csub", i32, i32, /* isIntr */ 1>;
 
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_ADD_X2", "atomic_load_add_global", i64>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_SUB_X2", "atomic_load_sub_global", i64>;
-defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_INC_X2", "atomic_inc_global", i64>;
-defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_DEC_X2", "atomic_dec_global", i64>;
+defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_INC_X2", "atomic_load_inc_global", i64>;
+defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_DEC_X2", "atomic_load_dec_global", i64>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_AND_X2", "atomic_load_and_global", i64>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_SMAX_X2", "atomic_load_max_global", i64>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_UMAX_X2", "atomic_load_umax_global", i64>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_SMIN_X2", "atomic_load_min_global", i64>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_UMIN_X2", "atomic_load_umin_global", i64>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_OR_X2", "atomic_load_or_global", i64>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_SWAP_X2", "atomic_swap_global", i64>;
 defm : GlobalFLATAtomicPats <"GLOBAL_ATOMIC_CMPSWAP_X2", "AMDGPUatomic_cmp_swap_global", i64, v2i64>;

llvm/lib/Target/AMDGPU/R600ISelLowering.h

private:
 
   bool FoldOperand(SDNode *ParentNode, unsigned SrcIdx, SDValue &Src,
                    SDValue &Neg, SDValue &Abs, SDValue &Sel, SDValue &Imm,
                    SelectionDAG &DAG) const;
   SDValue constBufferLoad(LoadSDNode *LoadNode, int Block,
                           SelectionDAG &DAG) const;
 
   SDNode *PostISelFolding(MachineSDNode *N, SelectionDAG &DAG) const override;
+
+  TargetLowering::AtomicExpansionKind
+  shouldExpandAtomicRMWInIR(AtomicRMWInst *RMW) const override;
 };
 
 } // End namespace llvm;
 
 #endif

llvm/lib/Target/AMDGPU/R600ISelLowering.cpp

for (unsigned i = 0; i < 3; i++) {
       SDValue &Imm = Ops[ImmIdx];
       if (FoldOperand(Node, i, Src, Neg, Abs, Sel, Imm, DAG))
         return DAG.getMachineNode(Opcode, SDLoc(Node), Node->getVTList(), Ops);
     }
   }
 
   return Node;
 }
+
+TargetLowering::AtomicExpansionKind
+R600TargetLowering::shouldExpandAtomicRMWInIR(AtomicRMWInst *RMW) const {
+  switch (RMW->getOperation()) {
+  case AtomicRMWInst::Inc:
+  case AtomicRMWInst::Dec:
+    // FIXME: Cayman at least appears to have instructions for this, but the
+    // instruction defintions appear to be missing.
+    return AtomicExpansionKind::CmpXChg;
+  default:
+    break;
+  }
+
+  return AMDGPUTargetLowering::shouldExpandAtomicRMWInIR(RMW);
+}

llvm/lib/Target/AMDGPU/SIISelLowering.cpp

setTargetDAGCombine({ISD::LOAD,
                        ISD::ATOMIC_LOAD_OR,
                        ISD::ATOMIC_LOAD_XOR,
                        ISD::ATOMIC_LOAD_NAND,
                        ISD::ATOMIC_LOAD_MIN,
                        ISD::ATOMIC_LOAD_MAX,
                        ISD::ATOMIC_LOAD_UMIN,
                        ISD::ATOMIC_LOAD_UMAX,
                        ISD::ATOMIC_LOAD_FADD,
+                       ISD::ATOMIC_LOAD_INC,
+                       ISD::ATOMIC_LOAD_DEC,
                        ISD::INTRINSIC_VOID,
                        ISD::INTRINSIC_W_CHAIN});
 
   // FIXME: In other contexts we pretend this is a per-function property.
   setStackPointerRegisterToSaveRestore(AMDGPU::SGPR32);
 
   setSchedulingPreference(Sched::RegPressure);
 }
SDValue Ops[] = {
       Value,
       DAG.getTargetConstant(Offset, DL, MVT::i16),
       copyToM0(DAG, Chain, DL, M0).getValue(1), // Glue
     };
     return DAG.getMemIntrinsicNode(AMDGPUISD::DS_ORDERED_COUNT, DL,
                                    M->getVTList(), Ops, M->getMemoryVT(),
                                    M->getMemOperand());
   }
+  case Intrinsic::amdgcn_atomic_inc:
+  case Intrinsic::amdgcn_atomic_dec:
   case Intrinsic::amdgcn_ds_fadd: {
     MemSDNode *M = cast<MemSDNode>(Op);
     unsigned Opc;
     switch (IntrID) {
     case Intrinsic::amdgcn_ds_fadd:
       Opc = ISD::ATOMIC_LOAD_FADD;
       break;
+    case Intrinsic::amdgcn_atomic_inc:
+      Opc = ISD::ATOMIC_LOAD_INC;
+      break;
+    case Intrinsic::amdgcn_atomic_dec:
+      Opc = ISD::ATOMIC_LOAD_DEC;
+      break;
     }
 
     return DAG.getAtomic(Opc, SDLoc(Op), M->getMemoryVT(),
                          M->getOperand(0), M->getOperand(2), M->getOperand(3),
                          M->getMemOperand());
   }
-  case Intrinsic::amdgcn_atomic_inc:
-  case Intrinsic::amdgcn_atomic_dec:
   case Intrinsic::amdgcn_ds_fmin:
   case Intrinsic::amdgcn_ds_fmax: {
     MemSDNode *M = cast<MemSDNode>(Op);
     unsigned Opc;
     switch (IntrID) {
     case Intrinsic::amdgcn_atomic_inc:
-      Opc = AMDGPUISD::ATOMIC_INC;
+      Opc = ISD::ATOMIC_LOAD_INC;
       break;
     case Intrinsic::amdgcn_atomic_dec:
-      Opc = AMDGPUISD::ATOMIC_DEC;
+      Opc = ISD::ATOMIC_LOAD_DEC;
       break;
     case Intrinsic::amdgcn_ds_fmin:
       Opc = AMDGPUISD::ATOMIC_LOAD_FMIN;
       break;
     case Intrinsic::amdgcn_ds_fmax:
       Opc = AMDGPUISD::ATOMIC_LOAD_FMAX;
       break;
     default:
case ISD::CALLSEQ_END:
     return true;
   case ISD::INTRINSIC_WO_CHAIN:
     return AMDGPU::isIntrinsicSourceOfDivergence(
         cast<ConstantSDNode>(N->getOperand(0))->getZExtValue());
   case ISD::INTRINSIC_W_CHAIN:
     return AMDGPU::isIntrinsicSourceOfDivergence(
         cast<ConstantSDNode>(N->getOperand(1))->getZExtValue());
   case AMDGPUISD::ATOMIC_CMP_SWAP:
-  case AMDGPUISD::ATOMIC_INC:
-  case AMDGPUISD::ATOMIC_DEC:
   case AMDGPUISD::ATOMIC_LOAD_FMIN:
   case AMDGPUISD::ATOMIC_LOAD_FMAX:
   case AMDGPUISD::BUFFER_ATOMIC_SWAP:
   case AMDGPUISD::BUFFER_ATOMIC_ADD:
   case AMDGPUISD::BUFFER_ATOMIC_SUB:
   case AMDGPUISD::BUFFER_ATOMIC_SMIN:
   case AMDGPUISD::BUFFER_ATOMIC_UMIN:
   case AMDGPUISD::BUFFER_ATOMIC_SMAX:

llvm/lib/Target/AMDGPU/SIInstrInfo.td

def SIsbuffer_load : SDNode<"AMDGPUISD::SBUFFER_LOAD",
   [SDNPMayLoad, SDNPMemOperand]
 >;
 
 def SIds_ordered_count : SDNode<"AMDGPUISD::DS_ORDERED_COUNT",
   SDTypeProfile<1, 2, [SDTCisVT<0, i32>, SDTCisVT<1, i32>, SDTCisVT<2, i16>]>,
   [SDNPMayLoad, SDNPMayStore, SDNPMemOperand, SDNPHasChain, SDNPInGlue]
 >;
 
-def SIatomic_inc : SDNode<"AMDGPUISD::ATOMIC_INC", SDTAtomic2,
-  [SDNPMayLoad, SDNPMayStore, SDNPMemOperand, SDNPHasChain]
->;
-
-def SIatomic_dec : SDNode<"AMDGPUISD::ATOMIC_DEC", SDTAtomic2,
-  [SDNPMayLoad, SDNPMayStore, SDNPMemOperand, SDNPHasChain]
->;
-
 def SDTAtomic2_f32 : SDTypeProfile<1, 2, [
   SDTCisSameAs<0,2>, SDTCisFP<0>, SDTCisPtrTy<1>
 ]>;
 
 def SIatomic_fmin : SDNode<"AMDGPUISD::ATOMIC_LOAD_FMIN", SDTAtomic2_f32,
   [SDNPMayLoad, SDNPMayStore, SDNPMemOperand, SDNPHasChain]
 >;
 
bit ret = !or(!eq(SrcVT.Value, v2i16.Value),
                 !eq(SrcVT.Value, v8f32.Value));
 }
 
 
 //===----------------------------------------------------------------------===//
 // PatFrags for global memory operations
 //===----------------------------------------------------------------------===//
 
-defm atomic_inc : binary_atomic_op_all_as<SIatomic_inc>;
-defm atomic_dec : binary_atomic_op_all_as<SIatomic_dec>;
 defm atomic_load_fmin : binary_atomic_op_all_as<SIatomic_fmin, 0>;
 defm atomic_load_fmax : binary_atomic_op_all_as<SIatomic_fmax, 0>;
 
 //===----------------------------------------------------------------------===//
 // SDNodes PatFrags for loads/stores with a glue input.
 // This is for SDNodes and PatFrag for local loads and stores to
 // enable s_mov_b32 m0, -1 to be glued to the memory instructions.
 //
let AddressSpaces = StoreAddress_region.AddrSpaces in {
     defm _region_m0 : binary_atomic_op <!cast<SDNode>(NAME#"_glue"), IsInt>;
     defm _region_m0 : noret_binary_atomic_op <!cast<SDNode>(NAME#"_glue"),
                                                   IsInt>;
   }
 }
 
 defm atomic_load_add : SIAtomicM0Glue2 <"LOAD_ADD">;
 defm atomic_load_sub : SIAtomicM0Glue2 <"LOAD_SUB">;
-defm atomic_inc : SIAtomicM0Glue2 <"INC", 1>;
-defm atomic_dec : SIAtomicM0Glue2 <"DEC", 1>;
+defm atomic_load_inc : SIAtomicM0Glue2 <"LOAD_INC">;
+defm atomic_load_dec : SIAtomicM0Glue2 <"LOAD_DEC">;
 defm atomic_load_and : SIAtomicM0Glue2 <"LOAD_AND">;
 defm atomic_load_min : SIAtomicM0Glue2 <"LOAD_MIN">;
 defm atomic_load_max : SIAtomicM0Glue2 <"LOAD_MAX">;
 defm atomic_load_or : SIAtomicM0Glue2 <"LOAD_OR">;
 defm atomic_load_xor : SIAtomicM0Glue2 <"LOAD_XOR">;
 defm atomic_load_umin : SIAtomicM0Glue2 <"LOAD_UMIN">;
 defm atomic_load_umax : SIAtomicM0Glue2 <"LOAD_UMAX">;
 defm atomic_swap : SIAtomicM0Glue2 <"SWAP">;

llvm/lib/Target/AMDGPU/SIInstructions.td

def G_AMDGPU_ATOMIC_CMPXCHG : AMDGPUGenericInstruction {
   let OutOperandList = (outs type0:$oldval);
   let InOperandList = (ins ptype1:$addr, type0:$cmpval_newval);
   let hasSideEffects = 0;
   let mayLoad = 1;
   let mayStore = 1;
 }
 
 let Namespace = "AMDGPU" in {
-def G_AMDGPU_ATOMIC_INC : G_ATOMICRMW_OP;
-def G_AMDGPU_ATOMIC_DEC : G_ATOMICRMW_OP;
 def G_AMDGPU_ATOMIC_FMIN : G_ATOMICRMW_OP;
 def G_AMDGPU_ATOMIC_FMAX : G_ATOMICRMW_OP;
 }
 
 class BufferAtomicGenericInstruction<bit NoRtn = 0> : AMDGPUGenericInstruction {
   let OutOperandList = !if(NoRtn, (outs), (outs type0:$dst));
   let InOperandList = (ins type0:$vdata, type1:$rsrc, type2:$vindex, type2:$voffset,
                            type2:$soffset, untyped_imm_0:$offset,

llvm/test/CodeGen/AMDGPU/flat_atomics.ll

 
 ; GCN-LABEL: {{^}}atomic_store_f16:
 ; GCN: flat_store_short v[{{[0-9]+}}:{{[0-9]+}}], {{v[0-9]+}}{{$}}
 define amdgpu_kernel void @atomic_store_f16(half %in, half* %out) {
 entry:
   store atomic half %in, half* %out seq_cst, align 2
   ret void
 }
+
+; GCN-LABEL: {{^}}atomic_inc_i32_offset:
+; CIVI: flat_atomic_inc v[{{[0-9]+}}:{{[0-9]+}}], v{{[0-9]+}}{{$}}
+; GFX9: flat_atomic_inc v[{{[0-9]+}}:{{[0-9]+}}], v{{[0-9]+}} offset:16{{$}}
+define amdgpu_kernel void @atomic_inc_i32_offset(i32* %out, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32* %out, i32 4
+  %val = atomicrmw volatile inc i32* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32_max_offset:
+; CIVI: flat_atomic_inc v[{{[0-9]+}}:{{[0-9]+}}], v{{[0-9]+}}{{$}}
+; GFX9: flat_atomic_inc v[{{[0-9]+}}:{{[0-9]+}}], v{{[0-9]+}} offset:4092{{$}}
+define amdgpu_kernel void @atomic_inc_i32_max_offset(i32* %out, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32* %out, i32 1023
+  %val = atomicrmw volatile inc i32* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32_max_offset_p1:
+; GCN: flat_atomic_inc v[{{[0-9]+}}:{{[0-9]+}}], v{{[0-9]+}}{{$}}
+define amdgpu_kernel void @atomic_inc_i32_max_offset_p1(i32* %out, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32* %out, i32 1024
+  %val = atomicrmw volatile inc i32* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32_ret_offset:
+; CIVI: flat_atomic_inc [[RET:v[0-9]+]], v[{{[0-9]+}}:{{[0-9]+}}], v{{[0-9]+}} glc{{$}}
+; GFX9: flat_atomic_inc [[RET:v[0-9]+]], v[{{[0-9]+}}:{{[0-9]+}}], v{{[0-9]+}} offset:16 glc{{$}}
+; GCN: flat_store_dword v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_inc_i32_ret_offset(i32* %out, i32* %out2, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32* %out, i32 4
+  %val = atomicrmw volatile inc i32* %gep, i32 %in seq_cst
+  store i32 %val, i32* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32_incr64_offset:
+; CIVI: flat_atomic_inc v[{{[0-9]+:[0-9]+}}], v{{[0-9]+$}}
+; GFX9: flat_atomic_inc v[{{[0-9]+:[0-9]+}}], v{{[0-9]+}} offset:16{{$}}
+define amdgpu_kernel void @atomic_inc_i32_incr64_offset(i32* %out, i32 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i32, i32* %out, i64 %index
+  %gep = getelementptr i32, i32* %ptr, i32 4
+  %val = atomicrmw volatile inc i32* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32_ret_incr64_offset:
+; CIVI: flat_atomic_inc [[RET:v[0-9]+]], v[{{[0-9]+:[0-9]+}}], v{{[0-9]+}} glc{{$}}
+; GFX9: flat_atomic_inc [[RET:v[0-9]+]], v[{{[0-9]+:[0-9]+}}], v{{[0-9]+}} offset:16 glc{{$}}
+; GCN: flat_store_dword v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_inc_i32_ret_incr64_offset(i32* %out, i32* %out2, i32 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i32, i32* %out, i64 %index
+  %gep = getelementptr i32, i32* %ptr, i32 4
+  %val = atomicrmw volatile inc i32* %gep, i32 %in seq_cst
+  store i32 %val, i32* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32:
+; GCN: flat_atomic_inc v[{{[0-9]+:[0-9]+}}], v{{[0-9]+$}}
+define amdgpu_kernel void @atomic_inc_i32(i32* %out, i32 %in) {
+entry:
+  %val = atomicrmw volatile inc i32* %out, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32_ret:
+; GCN: flat_atomic_inc [[RET:v[0-9]+]], v[{{[0-9]+:[0-9]+}}], v{{[0-9]+}} glc{{$}}
+; GCN: flat_store_dword v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_inc_i32_ret(i32* %out, i32* %out2, i32 %in) {
+entry:
+  %val = atomicrmw volatile inc i32* %out, i32 %in seq_cst
+  store i32 %val, i32* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32_incr64:
+; GCN: flat_atomic_inc v[{{[0-9]+:[0-9]+}}], v{{[0-9]+$}}
+define amdgpu_kernel void @atomic_inc_i32_incr64(i32* %out, i32 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i32, i32* %out, i64 %index
+  %val = atomicrmw volatile inc i32* %ptr, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32_ret_incr64:
+; GCN: flat_atomic_inc [[RET:v[0-9]+]], v[{{[0-9]+:[0-9]+}}], v{{[0-9]+}} glc{{$}}
+; GCN: flat_store_dword v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_inc_i32_ret_incr64(i32* %out, i32* %out2, i32 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i32, i32* %out, i64 %index
+  %val = atomicrmw volatile inc i32* %ptr, i32 %in seq_cst
+  store i32 %val, i32* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_offset:
+; CIVI: flat_atomic_dec v[{{[0-9]+}}:{{[0-9]+}}], v{{[0-9]+}}{{$}}
+; GFX9: flat_atomic_dec v[{{[0-9]+}}:{{[0-9]+}}], v{{[0-9]+}} offset:16{{$}}
+define amdgpu_kernel void @atomic_dec_i32_offset(i32* %out, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32* %out, i32 4
+  %val = atomicrmw volatile dec i32* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_max_offset:
+; CIVI: flat_atomic_dec v[{{[0-9]+}}:{{[0-9]+}}], v{{[0-9]+}}{{$}}
+; GFX9: flat_atomic_dec v[{{[0-9]+}}:{{[0-9]+}}], v{{[0-9]+}} offset:4092{{$}}
+define amdgpu_kernel void @atomic_dec_i32_max_offset(i32* %out, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32* %out, i32 1023
+  %val = atomicrmw volatile dec i32* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_max_offset_p1:
+; GCN: flat_atomic_dec v[{{[0-9]+}}:{{[0-9]+}}], v{{[0-9]+}}{{$}}
+define amdgpu_kernel void @atomic_dec_i32_max_offset_p1(i32* %out, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32* %out, i32 1024
+  %val = atomicrmw volatile dec i32* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_ret_offset:
+; CIVI: flat_atomic_dec [[RET:v[0-9]+]], v[{{[0-9]+}}:{{[0-9]+}}], v{{[0-9]+}} glc{{$}}
+; GFX9: flat_atomic_dec [[RET:v[0-9]+]], v[{{[0-9]+}}:{{[0-9]+}}], v{{[0-9]+}} offset:16 glc{{$}}
+; GCN: flat_store_dword v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_dec_i32_ret_offset(i32* %out, i32* %out2, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32* %out, i32 4
+  %val = atomicrmw volatile dec i32* %gep, i32 %in seq_cst
+  store i32 %val, i32* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_decr64_offset:
+; CIVI: flat_atomic_dec v[{{[0-9]+:[0-9]+}}], v{{[0-9]+$}}
+; GFX9: flat_atomic_dec v[{{[0-9]+:[0-9]+}}], v{{[0-9]+}} offset:16{{$}}
+define amdgpu_kernel void @atomic_dec_i32_decr64_offset(i32* %out, i32 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i32, i32* %out, i64 %index
+  %gep = getelementptr i32, i32* %ptr, i32 4
+  %val = atomicrmw volatile dec i32* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_ret_decr64_offset:
+; CIVI: flat_atomic_dec [[RET:v[0-9]+]], v[{{[0-9]+:[0-9]+}}], v{{[0-9]+}} glc{{$}}
+; GFX9: flat_atomic_dec [[RET:v[0-9]+]], v[{{[0-9]+:[0-9]+}}], v{{[0-9]+}} offset:16 glc{{$}}
+; GCN: flat_store_dword v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_dec_i32_ret_decr64_offset(i32* %out, i32* %out2, i32 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i32, i32* %out, i64 %index
+  %gep = getelementptr i32, i32* %ptr, i32 4
+  %val = atomicrmw volatile dec i32* %gep, i32 %in seq_cst
+  store i32 %val, i32* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32:
+; GCN: flat_atomic_dec v[{{[0-9]+:[0-9]+}}], v{{[0-9]+$}}
+define amdgpu_kernel void @atomic_dec_i32(i32* %out, i32 %in) {
+entry:
+  %val = atomicrmw volatile dec i32* %out, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_ret:
+; GCN: flat_atomic_dec [[RET:v[0-9]+]], v[{{[0-9]+:[0-9]+}}], v{{[0-9]+}} glc{{$}}
+; GCN: flat_store_dword v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_dec_i32_ret(i32* %out, i32* %out2, i32 %in) {
+entry:
+  %val = atomicrmw volatile dec i32* %out, i32 %in seq_cst
+  store i32 %val, i32* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_decr64:
+; GCN: flat_atomic_dec v[{{[0-9]+:[0-9]+}}], v{{[0-9]+$}}
+define amdgpu_kernel void @atomic_dec_i32_decr64(i32* %out, i32 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i32, i32* %out, i64 %index
+  %val = atomicrmw volatile dec i32* %ptr, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_ret_decr64:
+; GCN: flat_atomic_dec [[RET:v[0-9]+]], v[{{[0-9]+:[0-9]+}}], v{{[0-9]+}} glc{{$}}
+; GCN: flat_store_dword v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_dec_i32_ret_decr64(i32* %out, i32* %out2, i32 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i32, i32* %out, i64 %index
+  %val = atomicrmw volatile dec i32* %ptr, i32 %in seq_cst
+  store i32 %val, i32* %out2
+  ret void
+}

llvm/test/CodeGen/AMDGPU/flat_atomics_i64.ll

 ; GCN-LABEL: {{^}}atomic_store_f64_addr64:
 ; GCN: flat_store_dwordx2 {{v\[[0-9]+:[0-9]+\]}}, v[{{[0-9]+:[0-9]+}}]{{$}}
 define amdgpu_kernel void @atomic_store_f64_addr64(double %in, double* %out, i64 %index) {
 entry:
   %ptr = getelementptr double, double* %out, i64 %index
   store atomic double %in, double* %ptr seq_cst, align 8
   ret void
 }
+
+; GCN-LABEL: {{^}}atomic_inc_i64_offset:
+; GCN: flat_atomic_inc_x2 v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]}}{{$}}
+define amdgpu_kernel void @atomic_inc_i64_offset(i64* %out, i64 %in) {
+entry:
+  %gep = getelementptr i64, i64* %out, i64 4
+  %tmp0 = atomicrmw volatile inc i64* %gep, i64 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i64_ret_offset:
+; GCN: flat_atomic_inc_x2 [[RET:v\[[0-9]+:[0-9]+\]]], v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]}} glc{{$}}
+; GCN: flat_store_dwordx2 v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_inc_i64_ret_offset(i64* %out, i64* %out2, i64 %in) {
+entry:
+  %gep = getelementptr i64, i64* %out, i64 4
+  %tmp0 = atomicrmw volatile inc i64* %gep, i64 %in seq_cst
+  store i64 %tmp0, i64* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i64_incr64_offset:
+; GCN: flat_atomic_inc_x2 v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]}}{{$}}
+define amdgpu_kernel void @atomic_inc_i64_incr64_offset(i64* %out, i64 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i64, i64* %out, i64 %index
+  %gep = getelementptr i64, i64* %ptr, i64 4
+  %tmp0 = atomicrmw volatile inc i64* %gep, i64 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i64_ret_incr64_offset:
+; GCN: flat_atomic_inc_x2 [[RET:v\[[0-9]+:[0-9]+\]]], v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]}} glc{{$}}
+; GCN: flat_store_dwordx2 v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_inc_i64_ret_incr64_offset(i64* %out, i64* %out2, i64 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i64, i64* %out, i64 %index
+  %gep = getelementptr i64, i64* %ptr, i64 4
+  %tmp0 = atomicrmw volatile inc i64* %gep, i64 %in seq_cst
+  store i64 %tmp0, i64* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i64:
+; GCN: flat_atomic_inc_x2 v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]$}}
+define amdgpu_kernel void @atomic_inc_i64(i64* %out, i64 %in) {
+entry:
+  %tmp0 = atomicrmw volatile inc i64* %out, i64 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i64_ret:
+; GCN: flat_atomic_inc_x2 [[RET:v\[[0-9]+:[0-9]+\]]], v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]}} glc{{$}}
+; GCN: flat_store_dwordx2 v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_inc_i64_ret(i64* %out, i64* %out2, i64 %in) {
+entry:
+  %tmp0 = atomicrmw volatile inc i64* %out, i64 %in seq_cst
+  store i64 %tmp0, i64* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i64_incr64:
+; GCN: flat_atomic_inc_x2 v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]$}}
+define amdgpu_kernel void @atomic_inc_i64_incr64(i64* %out, i64 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i64, i64* %out, i64 %index
+  %tmp0 = atomicrmw volatile inc i64* %ptr, i64 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i64_ret_incr64:
+; GCN: flat_atomic_inc_x2 [[RET:v\[[0-9]+:[0-9]+\]]], v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]}} glc{{$}}
+; GCN: flat_store_dwordx2 v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_inc_i64_ret_incr64(i64* %out, i64* %out2, i64 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i64, i64* %out, i64 %index
+  %tmp0 = atomicrmw volatile inc i64* %ptr, i64 %in seq_cst
+  store i64 %tmp0, i64* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i64_offset:
+; GCN: flat_atomic_dec_x2 v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]}}{{$}}
+define amdgpu_kernel void @atomic_dec_i64_offset(i64* %out, i64 %in) {
+entry:
+  %gep = getelementptr i64, i64* %out, i64 4
+  %tmp0 = atomicrmw volatile dec i64* %gep, i64 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i64_ret_offset:
+; GCN: flat_atomic_dec_x2 [[RET:v\[[0-9]+:[0-9]+\]]], v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]}} glc{{$}}
+; GCN: flat_store_dwordx2 v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_dec_i64_ret_offset(i64* %out, i64* %out2, i64 %in) {
+entry:
+  %gep = getelementptr i64, i64* %out, i64 4
+  %tmp0 = atomicrmw volatile dec i64* %gep, i64 %in seq_cst
+  store i64 %tmp0, i64* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i64_decr64_offset:
+; GCN: flat_atomic_dec_x2 v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]}}{{$}}
+define amdgpu_kernel void @atomic_dec_i64_decr64_offset(i64* %out, i64 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i64, i64* %out, i64 %index
+  %gep = getelementptr i64, i64* %ptr, i64 4
+  %tmp0 = atomicrmw volatile dec i64* %gep, i64 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i64_ret_decr64_offset:
+; GCN: flat_atomic_dec_x2 [[RET:v\[[0-9]+:[0-9]+\]]], v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]}} glc{{$}}
+; GCN: flat_store_dwordx2 v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_dec_i64_ret_decr64_offset(i64* %out, i64* %out2, i64 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i64, i64* %out, i64 %index
+  %gep = getelementptr i64, i64* %ptr, i64 4
+  %tmp0 = atomicrmw volatile dec i64* %gep, i64 %in seq_cst
+  store i64 %tmp0, i64* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i64:
+; GCN: flat_atomic_dec_x2 v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]$}}
+define amdgpu_kernel void @atomic_dec_i64(i64* %out, i64 %in) {
+entry:
+  %tmp0 = atomicrmw volatile dec i64* %out, i64 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i64_ret:
+; GCN: flat_atomic_dec_x2 [[RET:v\[[0-9]+:[0-9]+\]]], v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]}} glc{{$}}
+; GCN: flat_store_dwordx2 v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_dec_i64_ret(i64* %out, i64* %out2, i64 %in) {
+entry:
+  %tmp0 = atomicrmw volatile dec i64* %out, i64 %in seq_cst
+  store i64 %tmp0, i64* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i64_decr64:
+; GCN: flat_atomic_dec_x2 v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]$}}
+define amdgpu_kernel void @atomic_dec_i64_decr64(i64* %out, i64 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i64, i64* %out, i64 %index
+  %tmp0 = atomicrmw volatile dec i64* %ptr, i64 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i64_ret_decr64:
+; GCN: flat_atomic_dec_x2 [[RET:v\[[0-9]+:[0-9]+\]]], v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]}} glc{{$}}
+; GCN: flat_store_dwordx2 v{{\[[0-9]+:[0-9]+\]}}, [[RET]]
+define amdgpu_kernel void @atomic_dec_i64_ret_decr64(i64* %out, i64* %out2, i64 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i64, i64* %out, i64 %index
+  %tmp0 = atomicrmw volatile dec i64* %ptr, i64 %in seq_cst
+  store i64 %tmp0, i64* %out2
+  ret void
+}

llvm/test/CodeGen/AMDGPU/global_atomics.ll

 ; SI: buffer_store_short {{v[0-9]+}}, off, s[{{[0-9]+}}:{{[0-9]+}}], 0{{$}}
 ; VI: flat_store_short v[{{[0-9]+}}:{{[0-9]+}}], {{v[0-9]+$}}
 ; GFX9: global_store_short {{v[0-9]+}}, {{v[0-9]+}}, s{{\[[0-9]+:[0-9]+\]$}}
 define amdgpu_kernel void @atomic_store_f16(half %in, half addrspace(1)* %out) {
 entry:
   store atomic half %in, half addrspace(1)* %out seq_cst, align 2
   ret void
 }
+
+; GCN-LABEL: {{^}}atomic_inc_i32_offset:
+; SIVI: buffer_atomic_inc v{{[0-9]+}}, off, s[{{[0-9]+}}:{{[0-9]+}}], 0 offset:16{{$}}
+; GFX9: global_atomic_inc v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+}}:{{[0-9]+}}] offset:16{{$}}
+define amdgpu_kernel void @atomic_inc_i32_offset(i32 addrspace(1)* %out, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32 addrspace(1)* %out, i64 4
+  %val = atomicrmw volatile inc i32 addrspace(1)* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32_max_neg_offset:
+; GFX9: global_atomic_inc v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+}}:{{[0-9]+}}] offset:-4096{{$}}
+define amdgpu_kernel void @atomic_inc_i32_max_neg_offset(i32 addrspace(1)* %out, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32 addrspace(1)* %out, i64 -1024
+  %val = atomicrmw volatile inc i32 addrspace(1)* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32_soffset:
+; SIVI: s_mov_b32 [[SREG:s[0-9]+]], 0x8ca0
+; SIVI: buffer_atomic_inc v{{[0-9]+}}, off, s[{{[0-9]+}}:{{[0-9]+}}], [[SREG]]{{$}}
+
+; GFX9: v_mov_b32_e32 [[OFFSET:v[0-9]+]], 0x8000{{$}}
+; GFX9: global_atomic_inc [[OFFSET]], v{{[0-9]+}}, s{{\[[0-9]:[0-9]+\]}} offset:3232{{$}}
+define amdgpu_kernel void @atomic_inc_i32_soffset(i32 addrspace(1)* %out, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32 addrspace(1)* %out, i64 9000
+  %val = atomicrmw volatile inc i32 addrspace(1)* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32_huge_offset:
+; SI-DAG: v_mov_b32_e32 v[[PTRLO:[0-9]+]], 0xdeac
+; SI-DAG: v_mov_b32_e32 v[[PTRHI:[0-9]+]], 0xabcd
+; SI: buffer_atomic_inc v{{[0-9]+}}, v[[[PTRLO]]:[[PTRHI]]], s[{{[0-9]+}}:{{[0-9]+}}], 0 addr64{{$}}
+
+; VI: flat_atomic_inc
+
+; GFX9: s_add_u32 s[[LOW_K:[0-9]+]], s{{[0-9]+}}, 0xdeac
+; GFX9: s_addc_u32 s[[HIGH_K:[0-9]+]], s{{[0-9]+}}, 0xabcd
+; GFX9: global_atomic_inc v{{[0-9]+}}, v{{[0-9]+}}, s[[[LOW_K]]:[[HIGH_K]]]{{$}}
+define amdgpu_kernel void @atomic_inc_i32_huge_offset(i32 addrspace(1)* %out, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32 addrspace(1)* %out, i64 47224239175595
+
+  %val = atomicrmw volatile inc i32 addrspace(1)* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32_ret_offset:
+; SIVI: buffer_atomic_inc [[RET:v[0-9]+]], off, s[{{[0-9]+}}:{{[0-9]+}}], 0 offset:16 glc{{$}}
+; SIVI: buffer_store_dword [[RET]]
+
+; GFX9: global_atomic_inc v{{[0-9]+}}, v{{[0-9]+}}, v{{[0-9]+}}, s{{\[[0-9]+:[0-9]+\]}} offset:16 glc{{$}}
+define amdgpu_kernel void @atomic_inc_i32_ret_offset(i32 addrspace(1)* %out, i32 addrspace(1)* %out2, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32 addrspace(1)* %out, i64 4
+  %val = atomicrmw volatile inc i32 addrspace(1)* %gep, i32 %in seq_cst
+  store i32 %val, i32 addrspace(1)* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32_addr64_offset:
+; SI: buffer_atomic_inc v{{[0-9]+}}, v[{{[0-9]+}}:{{[0-9]+}}], s[{{[0-9]+}}:{{[0-9]+}}], 0 addr64 offset:16{{$}}
+; VI: flat_atomic_inc v[{{[0-9]+:[0-9]+}}], v{{[0-9]+$}}
+; GFX9: global_atomic_inc v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+:[0-9]+}}] offset:16{{$}}
+define amdgpu_kernel void @atomic_inc_i32_addr64_offset(i32 addrspace(1)* %out, i32 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i32, i32 addrspace(1)* %out, i64 %index
+  %gep = getelementptr i32, i32 addrspace(1)* %ptr, i64 4
+  %val = atomicrmw volatile inc i32 addrspace(1)* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i32_ret_addr64_offset:
+; SI: buffer_atomic_inc [[RET:v[0-9]+]], v[{{[0-9]+}}:{{[0-9]+}}], s[{{[0-9]+}}:{{[0-9]+}}], 0 addr64 offset:16 glc{{$}}
+; VI: flat_atomic_inc [[RET:v[0-9]+]], v[{{[0-9]+:[0-9]+}}], v{{[0-9]+}} glc{{$}}
+; SIVI: buffer_store_dword [[RET]]
+
+; GFX9: global_atomic_inc [[RET:v[0-9]+]], v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+:[0-9]+}}] offset:16 glc{{$}}
+; GFX9: global_store_dword v{{[0-9]+}}, [[RET]], s
+define amdgpu_kernel void @atomic_inc_i32_ret_addr64_offset(i32 addrspace(1)* %out, i32 addrspace(1)* %out2, i32 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i32, i32 addrspace(1)* %out, i64 %index
+  %gep = getelementptr i32, i32 addrspace(1)* %ptr, i64 4
+  %val = atomicrmw volatile inc i32 addrspace(1)* %gep, i32 %in seq_cst
+  store i32 %val, i32 addrspace(1)* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_offset:
+; SIVI: buffer_atomic_dec v{{[0-9]+}}, off, s[{{[0-9]+}}:{{[0-9]+}}], 0 offset:16{{$}}
+; GFX9: global_atomic_dec v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+}}:{{[0-9]+}}] offset:16{{$}}
+define amdgpu_kernel void @atomic_dec_i32_offset(i32 addrspace(1)* %out, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32 addrspace(1)* %out, i64 4
+  %val = atomicrmw volatile dec i32 addrspace(1)* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_max_neg_offset:
+; GFX9: global_atomic_dec v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+}}:{{[0-9]+}}] offset:-4096{{$}}
+define amdgpu_kernel void @atomic_dec_i32_max_neg_offset(i32 addrspace(1)* %out, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32 addrspace(1)* %out, i64 -1024
+  %val = atomicrmw volatile dec i32 addrspace(1)* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_soffset:
+; SIVI: s_mov_b32 [[SREG:s[0-9]+]], 0x8ca0
+; SIVI: buffer_atomic_dec v{{[0-9]+}}, off, s[{{[0-9]+}}:{{[0-9]+}}], [[SREG]]{{$}}
+
+; GFX9: v_mov_b32_e32 [[OFFSET:v[0-9]+]], 0x8000{{$}}
+; GFX9: global_atomic_dec [[OFFSET]], v{{[0-9]+}}, s{{\[[0-9]:[0-9]+\]}} offset:3232{{$}}
+define amdgpu_kernel void @atomic_dec_i32_soffset(i32 addrspace(1)* %out, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32 addrspace(1)* %out, i64 9000
+  %val = atomicrmw volatile dec i32 addrspace(1)* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_huge_offset:
+; SI-DAG: v_mov_b32_e32 v[[PTRLO:[0-9]+]], 0xdeac
+; SI-DAG: v_mov_b32_e32 v[[PTRHI:[0-9]+]], 0xabcd
+; SI: buffer_atomic_dec v{{[0-9]+}}, v[[[PTRLO]]:[[PTRHI]]], s[{{[0-9]+}}:{{[0-9]+}}], 0 addr64{{$}}
+
+; VI: flat_atomic_dec
+
+; GFX9: s_add_u32 s[[LOW_K:[0-9]+]], s{{[0-9]+}}, 0xdeac
+; GFX9: s_addc_u32 s[[HIGH_K:[0-9]+]], s{{[0-9]+}}, 0xabcd
+; GFX9: global_atomic_dec v{{[0-9]+}}, v{{[0-9]+}}, s[[[LOW_K]]:[[HIGH_K]]]{{$}}
+define amdgpu_kernel void @atomic_dec_i32_huge_offset(i32 addrspace(1)* %out, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32 addrspace(1)* %out, i64 47224239175595
+
+  %val = atomicrmw volatile dec i32 addrspace(1)* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_ret_offset:
+; SIVI: buffer_atomic_dec [[RET:v[0-9]+]], off, s[{{[0-9]+}}:{{[0-9]+}}], 0 offset:16 glc{{$}}
+; SIVI: buffer_store_dword [[RET]]
+
+; GFX9: global_atomic_dec v{{[0-9]+}}, v{{[0-9]+}}, v{{[0-9]+}}, s{{\[[0-9]+:[0-9]+\]}} offset:16 glc{{$}}
+define amdgpu_kernel void @atomic_dec_i32_ret_offset(i32 addrspace(1)* %out, i32 addrspace(1)* %out2, i32 %in) {
+entry:
+  %gep = getelementptr i32, i32 addrspace(1)* %out, i64 4
+  %val = atomicrmw volatile dec i32 addrspace(1)* %gep, i32 %in seq_cst
+  store i32 %val, i32 addrspace(1)* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_addr64_offset:
+; SI: buffer_atomic_dec v{{[0-9]+}}, v[{{[0-9]+}}:{{[0-9]+}}], s[{{[0-9]+}}:{{[0-9]+}}], 0 addr64 offset:16{{$}}
+; VI: flat_atomic_dec v[{{[0-9]+:[0-9]+}}], v{{[0-9]+$}}
+; GFX9: global_atomic_dec v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+:[0-9]+}}] offset:16{{$}}
+define amdgpu_kernel void @atomic_dec_i32_addr64_offset(i32 addrspace(1)* %out, i32 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i32, i32 addrspace(1)* %out, i64 %index
+  %gep = getelementptr i32, i32 addrspace(1)* %ptr, i64 4
+  %val = atomicrmw volatile dec i32 addrspace(1)* %gep, i32 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i32_ret_addr64_offset:
+; SI: buffer_atomic_dec [[RET:v[0-9]+]], v[{{[0-9]+}}:{{[0-9]+}}], s[{{[0-9]+}}:{{[0-9]+}}], 0 addr64 offset:16 glc{{$}}
+; VI: flat_atomic_dec [[RET:v[0-9]+]], v[{{[0-9]+:[0-9]+}}], v{{[0-9]+}} glc{{$}}
+; SIVI: buffer_store_dword [[RET]]
+
+; GFX9: global_atomic_dec [[RET:v[0-9]+]], v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+:[0-9]+}}] offset:16 glc{{$}}
+; GFX9: global_store_dword v{{[0-9]+}}, [[RET]], s
+define amdgpu_kernel void @atomic_dec_i32_ret_addr64_offset(i32 addrspace(1)* %out, i32 addrspace(1)* %out2, i32 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i32, i32 addrspace(1)* %out, i64 %index
+  %gep = getelementptr i32, i32 addrspace(1)* %ptr, i64 4
+  %val = atomicrmw volatile dec i32 addrspace(1)* %gep, i32 %in seq_cst
+  store i32 %val, i32 addrspace(1)* %out2
+  ret void
+}

llvm/test/CodeGen/AMDGPU/global_atomics_i64.ll

 ; GFX9: global_store_dwordx2 v{{[0-9]+}}, {{v\[[0-9]+:[0-9]+\]}}, s[{{[0-9]+:[0-9]+}}] offset:32{{$}}
 define amdgpu_kernel void @atomic_store_f64_addr64_offset(double %in, double addrspace(1)* %out, i64 %index) {
 entry:
   %ptr = getelementptr double, double addrspace(1)* %out, i64 %index
   %gep = getelementptr double, double addrspace(1)* %ptr, i64 4
   store atomic double %in, double addrspace(1)* %gep seq_cst, align 8
   ret void
 }
+
+; GCN-LABEL: {{^}}atomic_inc_i64_offset:
+; CIVI: buffer_atomic_inc_x2 v{{\[[0-9]+:[0-9]+\]}}, off, s[{{[0-9]+}}:{{[0-9]+}}], 0 offset:32{{$}}
+
+; GFX9: global_atomic_inc_x2 v{{[0-9]+}}, v{{\[[0-9]+:[0-9]+\]}}, s[{{[0-9]+}}:{{[0-9]+}}] offset:32{{$}}
+define amdgpu_kernel void @atomic_inc_i64_offset(i64 addrspace(1)* %out, i64 %in) {
+entry:
+  %gep = getelementptr i64, i64 addrspace(1)* %out, i64 4
+  %tmp0 = atomicrmw volatile inc i64 addrspace(1)* %gep, i64 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i64_ret_offset:
+; CIVI: buffer_atomic_inc_x2 [[RET:v\[[0-9]+:[0-9]+\]]], off, s[{{[0-9]+}}:{{[0-9]+}}], 0 offset:32 glc{{$}}
+; CIVI: buffer_store_dwordx2 [[RET]]
+
+; GFX9: global_atomic_inc_x2 v{{\[[0-9]+:[0-9]+\]}}, v{{[0-9]+}}, v{{\[[0-9]+:[0-9]+\]}}, s[{{[0-9]+}}:{{[0-9]+}}] offset:32 glc{{$}}
+define amdgpu_kernel void @atomic_inc_i64_ret_offset(i64 addrspace(1)* %out, i64 addrspace(1)* %out2, i64 %in) {
+entry:
+  %gep = getelementptr i64, i64 addrspace(1)* %out, i64 4
+  %tmp0 = atomicrmw volatile inc i64 addrspace(1)* %gep, i64 %in seq_cst
+  store i64 %tmp0, i64 addrspace(1)* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_inc_i64_incr64_offset:
+; CI: buffer_atomic_inc_x2 v{{\[[0-9]+:[0-9]+\]}}, v[{{[0-9]+}}:{{[0-9]+}}], s[{{[0-9]+}}:{{[0-9]+}}], 0 addr64 offset:32{{$}}
+; VI: flat_atomic_inc_x2 v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]}}{{$}}
+; GFX9: global_atomic_inc_x2 v{{[0-9]+}}, v[{{[0-9]+:[0-9]+}}], s{{\[[0-9]+:[0-9]+\]}} offset:32{{$}}
+define amdgpu_kernel void @atomic_inc_i64_incr64_offset(i64 addrspace(1)* %out, i64 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i64, i64 addrspace(1)* %out, i64 %index
+  %gep = getelementptr i64, i64 addrspace(1)* %ptr, i64 4
+  %tmp0 = atomicrmw volatile inc i64 addrspace(1)* %gep, i64 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i64_offset:
+; CIVI: buffer_atomic_dec_x2 v{{\[[0-9]+:[0-9]+\]}}, off, s[{{[0-9]+}}:{{[0-9]+}}], 0 offset:32{{$}}
+
+; GFX9: global_atomic_dec_x2 v{{[0-9]+}}, v{{\[[0-9]+:[0-9]+\]}}, s[{{[0-9]+}}:{{[0-9]+}}] offset:32{{$}}
+define amdgpu_kernel void @atomic_dec_i64_offset(i64 addrspace(1)* %out, i64 %in) {
+entry:
+  %gep = getelementptr i64, i64 addrspace(1)* %out, i64 4
+  %tmp0 = atomicrmw volatile dec i64 addrspace(1)* %gep, i64 %in seq_cst
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i64_ret_offset:
+; CIVI: buffer_atomic_dec_x2 [[RET:v\[[0-9]+:[0-9]+\]]], off, s[{{[0-9]+}}:{{[0-9]+}}], 0 offset:32 glc{{$}}
+; CIVI: buffer_store_dwordx2 [[RET]]
+
+; GFX9: global_atomic_dec_x2 v{{\[[0-9]+:[0-9]+\]}}, v{{[0-9]+}}, v{{\[[0-9]+:[0-9]+\]}}, s[{{[0-9]+}}:{{[0-9]+}}] offset:32 glc{{$}}
+define amdgpu_kernel void @atomic_dec_i64_ret_offset(i64 addrspace(1)* %out, i64 addrspace(1)* %out2, i64 %in) {
+entry:
+  %gep = getelementptr i64, i64 addrspace(1)* %out, i64 4
+  %tmp0 = atomicrmw volatile dec i64 addrspace(1)* %gep, i64 %in seq_cst
+  store i64 %tmp0, i64 addrspace(1)* %out2
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_i64_decr64_offset:
+; CI: buffer_atomic_dec_x2 v{{\[[0-9]+:[0-9]+\]}}, v[{{[0-9]+}}:{{[0-9]+}}], s[{{[0-9]+}}:{{[0-9]+}}], 0 addr64 offset:32{{$}}
+; VI: flat_atomic_dec_x2 v[{{[0-9]+:[0-9]+}}], v{{\[[0-9]+:[0-9]+\]}}{{$}}
+; GFX9: global_atomic_dec_x2 v{{[0-9]+}}, v[{{[0-9]+:[0-9]+}}], s{{\[[0-9]+:[0-9]+\]}} offset:32{{$}}
+define amdgpu_kernel void @atomic_dec_i64_decr64_offset(i64 addrspace(1)* %out, i64 %in, i64 %index) {
+entry:
+  %ptr = getelementptr i64, i64 addrspace(1)* %out, i64 %index
+  %gep = getelementptr i64, i64 addrspace(1)* %ptr, i64 4
+  %tmp0 = atomicrmw volatile dec i64 addrspace(1)* %gep, i64 %in seq_cst
+  ret void
+}

llvm/test/CodeGen/AMDGPU/local-atomics.ll

 
 ; GCN: ds_max_u32 v{{[0-9]+}}, v{{[0-9]+}} offset:16
 ; GCN: s_endpgm
 define amdgpu_kernel void @lds_atomic_umax_noret_i32_offset(i32 addrspace(3)* %ptr) nounwind {
   %gep = getelementptr i32, i32 addrspace(3)* %ptr, i32 4
   %result = atomicrmw umax i32 addrspace(3)* %gep, i32 4 seq_cst
   ret void
 }
+
+; FUNC-LABEL: {{^}}lds_atomic_inc_ret_i32:
+; SICIVI: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; EG: LDS_CMPST
+; GCN: ds_inc_rtn_u32
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_inc_ret_i32(i32 addrspace(1)* %out, i32 addrspace(3)* %ptr) nounwind {
+  %result = atomicrmw inc i32 addrspace(3)* %ptr, i32 4 seq_cst
+  store i32 %result, i32 addrspace(1)* %out, align 4
+  ret void
+}
+
+; FUNC-LABEL: {{^}}lds_atomic_inc_ret_i32_offset:
+; SICIVI: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; EG: LDS_CMPST
+; GCN: ds_inc_rtn_u32 v{{[0-9]+}}, v{{[0-9]+}}, v{{[0-9]+}} offset:16
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_inc_ret_i32_offset(i32 addrspace(1)* %out, i32 addrspace(3)* %ptr) nounwind {
+  %gep = getelementptr i32, i32 addrspace(3)* %ptr, i32 4
+  %result = atomicrmw inc i32 addrspace(3)* %gep, i32 4 seq_cst
+  store i32 %result, i32 addrspace(1)* %out, align 4
+  ret void
+}
+
+; FUNC-LABEL: {{^}}lds_atomic_inc_noret_i32:
+; SICIVI: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; GCN: ds_inc_u32
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_inc_noret_i32(i32 addrspace(3)* %ptr) nounwind {
+  %result = atomicrmw inc i32 addrspace(3)* %ptr, i32 4 seq_cst
+  ret void
+}
+
+; FUNC-LABEL: {{^}}lds_atomic_inc_noret_i32_offset:
+; SICIVI: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; GCN: ds_inc_u32 v{{[0-9]+}}, v{{[0-9]+}} offset:16
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_inc_noret_i32_offset(i32 addrspace(3)* %ptr) nounwind {
+  %gep = getelementptr i32, i32 addrspace(3)* %ptr, i32 4
+  %result = atomicrmw inc i32 addrspace(3)* %gep, i32 4 seq_cst
+  ret void
+}
+
+; FUNC-LABEL: {{^}}lds_atomic_dec_ret_i32:
+; SICIVI: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; EG: LDS_CMPST
+; GCN: ds_dec_rtn_u32
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_dec_ret_i32(i32 addrspace(1)* %out, i32 addrspace(3)* %ptr) nounwind {
+  %result = atomicrmw dec i32 addrspace(3)* %ptr, i32 4 seq_cst
+  store i32 %result, i32 addrspace(1)* %out, align 4
+  ret void
+}
+
+; FUNC-LABEL: {{^}}lds_atomic_dec_ret_i32_offset:
+; SICIVI: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; EG: LDS_CMPST
+; GCN: ds_dec_rtn_u32 v{{[0-9]+}}, v{{[0-9]+}}, v{{[0-9]+}} offset:16
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_dec_ret_i32_offset(i32 addrspace(1)* %out, i32 addrspace(3)* %ptr) nounwind {
+  %gep = getelementptr i32, i32 addrspace(3)* %ptr, i32 4
+  %result = atomicrmw dec i32 addrspace(3)* %gep, i32 4 seq_cst
+  store i32 %result, i32 addrspace(1)* %out, align 4
+  ret void
+}
+
+; FUNC-LABEL: {{^}}lds_atomic_dec_noret_i32:
+; SICIVI: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; GCN: ds_dec_u32
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_dec_noret_i32(i32 addrspace(3)* %ptr) nounwind {
+  %result = atomicrmw dec i32 addrspace(3)* %ptr, i32 4 seq_cst
+  ret void
+}
+
+; FUNC-LABEL: {{^}}lds_atomic_dec_noret_i32_offset:
+; SICIVI: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; GCN: ds_dec_u32 v{{[0-9]+}}, v{{[0-9]+}} offset:16
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_dec_noret_i32_offset(i32 addrspace(3)* %ptr) nounwind {
+  %gep = getelementptr i32, i32 addrspace(3)* %ptr, i32 4
+  %result = atomicrmw dec i32 addrspace(3)* %gep, i32 4 seq_cst
+  ret void
+}

llvm/test/CodeGen/AMDGPU/local-atomics64.ll

 
 ; GCN: ds_max_u64 {{.*}} offset:32
 ; GCN: s_endpgm
 define amdgpu_kernel void @lds_atomic_umax_noret_i64_offset(i64 addrspace(3)* %ptr) nounwind {
   %gep = getelementptr i64, i64 addrspace(3)* %ptr, i32 4
   %result = atomicrmw umax i64 addrspace(3)* %gep, i64 4 seq_cst
   ret void
 }
+
+; GCN-LABEL: {{^}}lds_atomic_inc_ret_i64:
+; SICIVI: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; GCN: ds_inc_rtn_u64
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_inc_ret_i64(i64 addrspace(1)* %out, i64 addrspace(3)* %ptr) nounwind {
+  %result = atomicrmw inc i64 addrspace(3)* %ptr, i64 4 seq_cst
+  store i64 %result, i64 addrspace(1)* %out, align 8
+  ret void
+}
+
+; GCN-LABEL: {{^}}lds_atomic_inc_ret_i64_offset:
+; SICIVI-DAG: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; SI-DAG: s_load_dword [[PTR:s[0-9]+]], s{{\[[0-9]+:[0-9]+\]}}, 0xb
+; GFX89-DAG: s_load_dword [[PTR:s[0-9]+]], s{{\[[0-9]+:[0-9]+\]}}, 0x2c
+; GCN-DAG: v_mov_b32_e32 v[[LOVDATA:[0-9]+]], 9
+; GCN-DAG: v_mov_b32_e32 v[[HIVDATA:[0-9]+]], 0
+; GCN-DAG: v_mov_b32_e32 [[VPTR:v[0-9]+]], [[PTR]]
+; GCN: ds_inc_rtn_u64 [[RESULT:v\[[0-9]+:[0-9]+\]]], [[VPTR]], v[[[LOVDATA]]:[[HIVDATA]]] offset:32
+; GCN: buffer_store_dwordx2 [[RESULT]],
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_inc_ret_i64_offset(i64 addrspace(1)* %out, i64 addrspace(3)* %ptr) nounwind {
+  %gep = getelementptr i64, i64 addrspace(3)* %ptr, i64 4
+  %result = atomicrmw inc i64 addrspace(3)* %gep, i64 9 seq_cst
+  store i64 %result, i64 addrspace(1)* %out, align 8
+  ret void
+}
+
+; GCN-LABEL: {{^}}lds_atomic_inc1_ret_i64:
+; SICIVI-DAG: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; GCN-DAG: v_mov_b32_e32 v[[LOVDATA:[0-9]+]], 1{{$}}
+; GCN-DAG: v_mov_b32_e32 v[[HIVDATA:[0-9]+]], 0{{$}}
+; GCN: ds_inc_rtn_u64 [[RESULT:v\[[0-9]+:[0-9]+\]]], {{v[0-9]+}}, v[[[LOVDATA]]:[[HIVDATA]]]
+; GCN: buffer_store_dwordx2 [[RESULT]],
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_inc1_ret_i64(i64 addrspace(1)* %out, i64 addrspace(3)* %ptr) nounwind {
+  %result = atomicrmw inc i64 addrspace(3)* %ptr, i64 1 seq_cst
+  store i64 %result, i64 addrspace(1)* %out, align 8
+  ret void
+}
+
+; GCN-LABEL: {{^}}lds_atomic_inc1_ret_i64_offset:
+; SICIVI: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; GCN: ds_inc_rtn_u64 {{.*}} offset:32
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_inc1_ret_i64_offset(i64 addrspace(1)* %out, i64 addrspace(3)* %ptr) nounwind {
+  %gep = getelementptr i64, i64 addrspace(3)* %ptr, i32 4
+  %result = atomicrmw inc i64 addrspace(3)* %gep, i64 1 seq_cst
+  store i64 %result, i64 addrspace(1)* %out, align 8
+  ret void
+}
+
+; GCN-LABEL: {{^}}lds_atomic_dec_ret_i64:
+; SICIVI: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; GCN: ds_dec_rtn_u64
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_dec_ret_i64(i64 addrspace(1)* %out, i64 addrspace(3)* %ptr) nounwind {
+  %result = atomicrmw dec i64 addrspace(3)* %ptr, i64 4 seq_cst
+  store i64 %result, i64 addrspace(1)* %out, align 8
+  ret void
+}
+
+; GCN-LABEL: {{^}}lds_atomic_dec_ret_i64_offset:
+; SICIVI-DAG: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; SI-DAG: s_load_dword [[PTR:s[0-9]+]], s{{\[[0-9]+:[0-9]+\]}}, 0xb
+; GFX89-DAG: s_load_dword [[PTR:s[0-9]+]], s{{\[[0-9]+:[0-9]+\]}}, 0x2c
+; GCN-DAG: v_mov_b32_e32 v[[LOVDATA:[0-9]+]], 9
+; GCN-DAG: v_mov_b32_e32 v[[HIVDATA:[0-9]+]], 0
+; GCN-DAG: v_mov_b32_e32 [[VPTR:v[0-9]+]], [[PTR]]
+; GCN: ds_dec_rtn_u64 [[RESULT:v\[[0-9]+:[0-9]+\]]], [[VPTR]], v[[[LOVDATA]]:[[HIVDATA]]] offset:32
+; GCN: buffer_store_dwordx2 [[RESULT]],
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_dec_ret_i64_offset(i64 addrspace(1)* %out, i64 addrspace(3)* %ptr) nounwind {
+  %gep = getelementptr i64, i64 addrspace(3)* %ptr, i64 4
+  %result = atomicrmw dec i64 addrspace(3)* %gep, i64 9 seq_cst
+  store i64 %result, i64 addrspace(1)* %out, align 8
+  ret void
+}
+
+; GCN-LABEL: {{^}}lds_atomic_dec1_ret_i64:
+; SICIVI-DAG: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; GCN-DAG: v_mov_b32_e32 v[[LOVDATA:[0-9]+]], 1{{$}}
+; GCN-DAG: v_mov_b32_e32 v[[HIVDATA:[0-9]+]], 0{{$}}
+; GCN: ds_dec_rtn_u64 [[RESULT:v\[[0-9]+:[0-9]+\]]], {{v[0-9]+}}, v[[[LOVDATA]]:[[HIVDATA]]]
+; GCN: buffer_store_dwordx2 [[RESULT]],
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_dec1_ret_i64(i64 addrspace(1)* %out, i64 addrspace(3)* %ptr) nounwind {
+  %result = atomicrmw dec i64 addrspace(3)* %ptr, i64 1 seq_cst
+  store i64 %result, i64 addrspace(1)* %out, align 8
+  ret void
+}
+
+; GCN-LABEL: {{^}}lds_atomic_dec1_ret_i64_offset:
+; SICIVI: s_mov_b32 m0
+; GFX9-NOT: m0
+
+; GCN: ds_dec_rtn_u64 {{.*}} offset:32
+; GCN: s_endpgm
+define amdgpu_kernel void @lds_atomic_dec1_ret_i64_offset(i64 addrspace(1)* %out, i64 addrspace(3)* %ptr) nounwind {
+  %gep = getelementptr i64, i64 addrspace(3)* %ptr, i32 4
+  %result = atomicrmw dec i64 addrspace(3)* %gep, i64 1 seq_cst
+  store i64 %result, i64 addrspace(1)* %out, align 8
+  ret void
+}

llvm/test/CodeGen/AMDGPU/shl_add_ptr.ll

define amdgpu_kernel void @atomic_umax_shl_base_lds_0(i32 addrspace(1)* %out, i32 addrspace(1)* %add_use) #0 {
   %idx.0 = add nsw i32 %tid.x, 2
   %arrayidx0 = getelementptr inbounds [512 x i32], [512 x i32] addrspace(3)* @lds2, i32 0, i32 %idx.0
   %val = atomicrmw umax i32 addrspace(3)* %arrayidx0, i32 3 seq_cst
   store i32 %val, i32 addrspace(1)* %out, align 4
   store i32 %idx.0, i32 addrspace(1)* %add_use, align 4
   ret void
 }
 
+; GCN-LABEL: {{^}}atomic_inc_shl_base_lds_0:
+; GCN: v_lshlrev_b32_e32 [[PTR:v[0-9]+]], 2, {{v[0-9]+}}
+; GCN: ds_inc_rtn_u32 {{v[0-9]+}}, [[PTR]], {{v[0-9]+}} offset:8
+; GCN: s_endpgm
+define amdgpu_kernel void @atomic_inc_shl_base_lds_0(i32 addrspace(1)* %out, i32 addrspace(1)* %add_use) #0 {
+  %tid.x = tail call i32 @llvm.amdgcn.workitem.id.x() #1
+  %idx.0 = add nsw i32 %tid.x, 2
+  %arrayidx0 = getelementptr inbounds [512 x i32], [512 x i32] addrspace(3)* @lds2, i32 0, i32 %idx.0
+  %val = atomicrmw inc i32 addrspace(3)* %arrayidx0, i32 31 seq_cst
+  store i32 %val, i32 addrspace(1)* %out, align 4
+  store i32 %idx.0, i32 addrspace(1)* %add_use, align 4
+  ret void
+}
+
+; GCN-LABEL: {{^}}atomic_dec_shl_base_lds_0:
+; GCN: v_lshlrev_b32_e32 [[PTR:v[0-9]+]], 2, {{v[0-9]+}}
+; GCN: ds_dec_rtn_u32 {{v[0-9]+}}, [[PTR]], {{v[0-9]+}} offset:8
+; GCN: s_endpgm
+define amdgpu_kernel void @atomic_dec_shl_base_lds_0(i32 addrspace(1)* %out, i32 addrspace(1)* %add_use) #0 {
+  %tid.x = tail call i32 @llvm.amdgcn.workitem.id.x() #1
+  %idx.0 = add nsw i32 %tid.x, 2
+  %arrayidx0 = getelementptr inbounds [512 x i32], [512 x i32] addrspace(3)* @lds2, i32 0, i32 %idx.0
+  %val = atomicrmw dec i32 addrspace(3)* %arrayidx0, i32 31 seq_cst
+  store i32 %val, i32 addrspace(1)* %out, align 4
+  store i32 %idx.0, i32 addrspace(1)* %add_use, align 4
+  ret void
+}
+
 ; GCN-LABEL: {{^}}shl_add_ptr_combine_2use_lds:
 ; GCN: v_lshlrev_b32_e32 [[SCALE0:v[0-9]+]], 3, v0
 ; GCN: v_lshlrev_b32_e32 [[SCALE1:v[0-9]+]], 4, v0
 ; GCN: ds_write_b32 [[SCALE0]], v{{[0-9]+}} offset:32
 ; GCN: ds_write_b32 [[SCALE1]], v{{[0-9]+}} offset:64
 define void @shl_add_ptr_combine_2use_lds(i32 %idx) #0 {
   %idx.add = add nuw i32 %idx, 4
   %shl0 = shl i32 %idx.add, 3