Revert "[amdgpu] Reimplement LDS lowering"

This reverts commit 982017240d7f25a8a6969b8b73dc51f9ac5b93ed.
Breaks check-llvm, see https://reviews.llvm.org/D139433#3974862

1 files changed, 2 insertions, 55 deletions

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUMachineFunction.cpp b/llvm/lib/Target/AMDGPU/AMDGPUMachineFunction.cpp
index d8133a9..488b3be 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUMachineFunction.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUMachineFunction.cpp
@@ -84,24 +84,6 @@ unsigned AMDGPUMachineFunction::allocateLDSGlobal(const DataLayout &DL,
   return Offset;
 }
 
-static constexpr StringLiteral ModuleLDSName = "llvm.amdgcn.module.lds";
-
-bool AMDGPUMachineFunction::isKnownAddressLDSGlobal(const GlobalVariable &GV) {
-  auto name = GV.getName();
-  return (name == ModuleLDSName) ||
-         (name.startswith("llvm.amdgcn.kernel.") && name.endswith(".lds"));
-}
-
-const Function *AMDGPUMachineFunction::getKernelLDSFunctionFromGlobal(
-    const GlobalVariable &GV) {
-  const Module &M = *GV.getParent();
-  StringRef N(GV.getName());
-  if (N.consume_front("llvm.amdgcn.kernel.") && N.consume_back(".lds")) {
-    return M.getFunction(N);
-  }
-  return nullptr;
-}
-
 const GlobalVariable *
 AMDGPUMachineFunction::getKernelLDSGlobalFromFunction(const Function &F) {
   const Module *M = F.getParent();
@@ -116,37 +98,6 @@ static bool canElideModuleLDS(const Function &F) {
   return F.hasFnAttribute("amdgpu-elide-module-lds");
 }
 
-unsigned AMDGPUMachineFunction::calculateKnownAddressOfLDSGlobal(
-    const GlobalVariable &GV) {
-  // module.lds, then alignment padding, then kernel.lds, then other variables
-  // if any
-
-  assert(isKnownAddressLDSGlobal(GV));
-  unsigned Offset = 0;
-
-  if (GV.getName() == ModuleLDSName) {
-    return 0;
-  }
-
-  const Module *M = GV.getParent();
-  const DataLayout &DL = M->getDataLayout();
-
-  const GlobalVariable *GVM = M->getNamedGlobal(ModuleLDSName);
-  const Function *f = getKernelLDSFunctionFromGlobal(GV);
-
-  // Account for module.lds if allocated for this function
-  if (GVM && f && !canElideModuleLDS(*f)) {
-    // allocator aligns this to var align, but it's zero to begin with
-    Offset += DL.getTypeAllocSize(GVM->getValueType());
-  }
-
-  // No dynamic LDS alignment done by allocateModuleLDSGlobal
-  Offset = alignTo(
-      Offset, DL.getValueOrABITypeAlignment(GV.getAlign(), GV.getValueType()));
-
-  return Offset;
-}
-
 void AMDGPUMachineFunction::allocateKnownAddressLDSGlobal(const Function &F) {
   const Module *M = F.getParent();
 
@@ -173,25 +124,21 @@ void AMDGPUMachineFunction::allocateKnownAddressLDSGlobal(const Function &F) {
     // }
     // other variables, e.g. dynamic lds, allocated after this call
 
-    const GlobalVariable *GV = M->getNamedGlobal(ModuleLDSName);
+    const GlobalVariable *GV = M->getNamedGlobal("llvm.amdgcn.module.lds");
     const GlobalVariable *KV = getKernelLDSGlobalFromFunction(F);
 
     if (GV && !canElideModuleLDS(F)) {
-      assert(isKnownAddressLDSGlobal(*GV));
       unsigned Offset = allocateLDSGlobal(M->getDataLayout(), *GV, Align());
       (void)Offset;
-      assert(Offset == calculateKnownAddressOfLDSGlobal(*GV) &&
+      assert(Offset == 0 &&
              "Module LDS expected to be allocated before other LDS");
     }
 
     if (KV) {
       // The per-kernel offset is deterministic because it is allocated
       // before any other non-module LDS variables.
-      assert(isKnownAddressLDSGlobal(*KV));
       unsigned Offset = allocateLDSGlobal(M->getDataLayout(), *KV, Align());
       (void)Offset;
-      assert(Offset == calculateKnownAddressOfLDSGlobal(*KV) &&
-             "Kernel LDS expected to be immediately after module LDS");
     }
   }
 }