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(WIP) lower waveid on GFX9 #165332

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(WIP) lower waveid on GFX9 #165332

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9010ac8
waveid
Oct 27, 2025
26a2e9e
waveid
Oct 29, 2025
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3 changes: 3 additions & 0 deletions llvm/include/llvm/IR/IntrinsicsAMDGPU.td
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Original file line number Diff line number Diff line change
Expand Up @@ -2839,6 +2839,9 @@ def int_amdgcn_global_load_lds : AMDGPUGlobalLoadLDS;
def int_amdgcn_pops_exiting_wave_id :
DefaultAttrsIntrinsic<[llvm_i32_ty], [], [IntrNoMem, IntrHasSideEffects]>;

// i32 @llvm.amdgcn.gfx9_wave_id(i32)
def int_amdgcn_gfx9_wave_id : DefaultAttrsIntrinsic<[llvm_i32_ty], [llvm_i32_ty], [IntrNoMem, IntrConvergent]>;

//===----------------------------------------------------------------------===//
// GFX10 Intrinsics
//===----------------------------------------------------------------------===//
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13 changes: 13 additions & 0 deletions llvm/lib/Target/AMDGPU/SIISelLowering.cpp
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Expand Up @@ -31,10 +31,12 @@
#include "llvm/CodeGen/GlobalISel/GISelValueTracking.h"
#include "llvm/CodeGen/GlobalISel/GenericMachineInstrs.h"
#include "llvm/CodeGen/GlobalISel/MIPatternMatch.h"
#include "llvm/CodeGen/ISDOpcodes.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/SDPatternMatch.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/IntrinsicInst.h"
Expand Down Expand Up @@ -9874,6 +9876,17 @@ SDValue SITargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
: DAG.getPOISON(VT);
case Intrinsic::amdgcn_wave_id:
return lowerWaveID(DAG, Op);
case Intrinsic::amdgcn_gfx9_wave_id: {
MVT VT = MVT::i32;
auto Ratio = DAG.getAnyExtOrTrunc(Op.getOperand(0), DL, VT);

SDValue WorkGrpId = lowerWorkGroupId(DAG, *MFI, VT,
AMDGPUFunctionArgInfo::WORKGROUP_ID_X,
AMDGPUFunctionArgInfo::CLUSTER_WORKGROUP_MAX_ID_X,
AMDGPUFunctionArgInfo::CLUSTER_WORKGROUP_ID_X);

return DAG.getNode(ISD::MUL, DL, VT, WorkGrpId, Ratio);
}
case Intrinsic::amdgcn_lds_kernel_id: {
if (MFI->isEntryFunction())
return getLDSKernelId(DAG, DL);
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