AMDGPU: Add analysis pass for function argument info

This will allow only adding necessary inputs to callee functions
that need special inputs forwarded from the kernel.

llvm-svn: 309996

1 files changed, 127 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.cpp b/llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.cpp
new file mode 100644
index 00000000000..cc2f99d08d7
--- /dev/null
+++ b/llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.cpp
@@ -0,0 +1,127 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "AMDGPU.h"
+#include "AMDGPUArgumentUsageInfo.h"
+#include "SIRegisterInfo.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+
+#define DEBUG_TYPE "amdgpu-argument-reg-usage-info"
+
+INITIALIZE_PASS(AMDGPUArgumentUsageInfo, DEBUG_TYPE,
+                "Argument Register Usage Information Storage", false, true)
+
+void ArgDescriptor::print(raw_ostream &OS,
+                          const TargetRegisterInfo *TRI) const {
+  if (!isSet()) {
+    OS << "<not set>\n";
+    return;
+  }
+
+  if (isRegister())
+    OS << "Reg " << PrintReg(getRegister(), TRI) << '\n';
+  else
+    OS << "Stack offset " << getStackOffset() << '\n';
+}
+
+char AMDGPUArgumentUsageInfo::ID = 0;
+
+const AMDGPUFunctionArgInfo AMDGPUArgumentUsageInfo::ExternFunctionInfo{};
+
+bool AMDGPUArgumentUsageInfo::doInitialization(Module &M) {
+  return false;
+}
+
+bool AMDGPUArgumentUsageInfo::doFinalization(Module &M) {
+  ArgInfoMap.clear();
+  return false;
+}
+
+void AMDGPUArgumentUsageInfo::print(raw_ostream &OS, const Module *M) const {
+  for (const auto &FI : ArgInfoMap) {
+    OS << "Arguments for " << FI.first->getName() << '\n'
+       << "  PrivateSegmentBuffer: " << FI.second.PrivateSegmentBuffer
+       << "  DispatchPtr: " << FI.second.DispatchPtr
+       << "  QueuePtr: " << FI.second.QueuePtr
+       << "  KernargSegmentPtr: " << FI.second.KernargSegmentPtr
+       << "  DispatchID: " << FI.second.DispatchID
+       << "  FlatScratchInit: " << FI.second.FlatScratchInit
+       << "  PrivateSegmentSize: " << FI.second.PrivateSegmentSize
+       << "  GridWorkgroupCountX: " << FI.second.GridWorkGroupCountX
+       << "  GridWorkgroupCountY: " << FI.second.GridWorkGroupCountY
+       << "  GridWorkgroupCountZ: " << FI.second.GridWorkGroupCountZ
+       << "  WorkGroupIDX: " << FI.second.WorkGroupIDX
+       << "  WorkGroupIDY: " << FI.second.WorkGroupIDY
+       << "  WorkGroupIDZ: " << FI.second.WorkGroupIDZ
+       << "  WorkGroupInfo: " << FI.second.WorkGroupInfo
+       << "  PrivateSegmentWaveByteOffset: "
+          << FI.second.PrivateSegmentWaveByteOffset
+       << "  ImplicitBufferPtr: " << FI.second.ImplicitBufferPtr
+       << "  WorkItemIDX " << FI.second.WorkItemIDX
+       << "  WorkItemIDY " << FI.second.WorkItemIDY
+       << "  WorkItemIDZ " << FI.second.WorkItemIDZ
+       << '\n';
+  }
+}
+
+std::pair<const ArgDescriptor *, const TargetRegisterClass *>
+AMDGPUFunctionArgInfo::getPreloadedValue(
+  AMDGPUFunctionArgInfo::PreloadedValue Value) const {
+  switch (Value) {
+  case AMDGPUFunctionArgInfo::PRIVATE_SEGMENT_BUFFER: {
+    return std::make_pair(
+      PrivateSegmentBuffer ? &PrivateSegmentBuffer : nullptr,
+      &AMDGPU::SGPR_128RegClass);
+  }
+  case AMDGPUFunctionArgInfo::IMPLICIT_BUFFER_PTR:
+    return std::make_pair(ImplicitBufferPtr ? &ImplicitBufferPtr : nullptr,
+                          &AMDGPU::SGPR_64RegClass);
+  case AMDGPUFunctionArgInfo::WORKGROUP_ID_X:
+    return std::make_pair(WorkGroupIDX ? &WorkGroupIDX : nullptr,
+                          &AMDGPU::SGPR_32RegClass);
+
+  case AMDGPUFunctionArgInfo::WORKGROUP_ID_Y:
+    return std::make_pair(WorkGroupIDY ? &WorkGroupIDY : nullptr,
+                          &AMDGPU::SGPR_32RegClass);
+  case AMDGPUFunctionArgInfo::WORKGROUP_ID_Z:
+    return std::make_pair(WorkGroupIDZ ? &WorkGroupIDZ : nullptr,
+                          &AMDGPU::SGPR_32RegClass);
+  case AMDGPUFunctionArgInfo::PRIVATE_SEGMENT_WAVE_BYTE_OFFSET:
+    return std::make_pair(
+      PrivateSegmentWaveByteOffset ? &PrivateSegmentWaveByteOffset : nullptr,
+      &AMDGPU::SGPR_32RegClass);
+  case AMDGPUFunctionArgInfo::KERNARG_SEGMENT_PTR:
+    return std::make_pair(KernargSegmentPtr ? &KernargSegmentPtr : nullptr,
+                          &AMDGPU::SGPR_64RegClass);
+  case AMDGPUFunctionArgInfo::DISPATCH_ID:
+    return std::make_pair(DispatchID ? &DispatchID : nullptr,
+                          &AMDGPU::SGPR_64RegClass);
+  case AMDGPUFunctionArgInfo::FLAT_SCRATCH_INIT:
+    return std::make_pair(FlatScratchInit ? &FlatScratchInit : nullptr,
+                          &AMDGPU::SGPR_64RegClass);
+  case AMDGPUFunctionArgInfo::DISPATCH_PTR:
+    return std::make_pair(DispatchPtr ? &DispatchPtr : nullptr,
+                          &AMDGPU::SGPR_64RegClass);
+  case AMDGPUFunctionArgInfo::QUEUE_PTR:
+    return std::make_pair(QueuePtr ? &QueuePtr : nullptr,
+                          &AMDGPU::SGPR_64RegClass);
+  case AMDGPUFunctionArgInfo::WORKITEM_ID_X:
+    return std::make_pair(WorkItemIDX ? &WorkItemIDX : nullptr,
+                          &AMDGPU::VGPR_32RegClass);
+  case AMDGPUFunctionArgInfo::WORKITEM_ID_Y:
+    return std::make_pair(WorkItemIDY ? &WorkItemIDY : nullptr,
+                          &AMDGPU::VGPR_32RegClass);
+  case AMDGPUFunctionArgInfo::WORKITEM_ID_Z:
+    return std::make_pair(WorkItemIDZ ? &WorkItemIDZ : nullptr,
+                          &AMDGPU::VGPR_32RegClass);
+  }
+  llvm_unreachable("unexpected preloaded value type");
+}