AMDGPU/GlobalISel: Add support for llvm.amdgcn.kernarg.segment.ptr
Note a normal select test is not currently possible because this
relies on input registers tracked in SIMachineFunctionInfo which
are not currently serializable in MIR, but this does work end-to-end
from the IR.
llvm-svn: 335490
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
index 80f062b..1801015 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
@@ -18,6 +18,7 @@
#include "AMDGPURegisterInfo.h"
#include "AMDGPUSubtarget.h"
#include "AMDGPUTargetMachine.h"
+#include "SIMachineFunctionInfo.h"
#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
#include "llvm/CodeGen/GlobalISel/InstructionSelector.h"
#include "llvm/CodeGen/GlobalISel/InstructionSelectorImpl.h"
@@ -181,6 +182,26 @@
break;
case Intrinsic::amdgcn_cvt_pkrtz:
return selectImpl(I, CoverageInfo);
+
+ case Intrinsic::amdgcn_kernarg_segment_ptr: {
+ MachineFunction *MF = I.getParent()->getParent();
+ MachineRegisterInfo &MRI = MF->getRegInfo();
+ const SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
+ const ArgDescriptor *InputPtrReg;
+ const TargetRegisterClass *RC;
+ const DebugLoc &DL = I.getDebugLoc();
+
+ std::tie(InputPtrReg, RC)
+ = MFI->getPreloadedValue(AMDGPUFunctionArgInfo::KERNARG_SEGMENT_PTR);
+ if (!InputPtrReg)
+ report_fatal_error("missing kernarg segment ptr");
+
+ BuildMI(*I.getParent(), &I, DL, TII.get(AMDGPU::COPY))
+ .add(I.getOperand(0))
+ .addReg(MRI.getLiveInVirtReg(InputPtrReg->getRegister()));
+ I.eraseFromParent();
+ return true;
+ }
}
return false;
}