Revert "[AMDGPU] Intrinsic for launching whole wave functions" (llvm#152286)

Reverts llvm#145859 because it broke a HIP test:
```
[34/59] Building CXX object External/HIP/CMakeFiles/TheNextWeek-hip-6.3.0.dir/workload/ray-tracing/TheNextWeek/main.cc.o
FAILED: External/HIP/CMakeFiles/TheNextWeek-hip-6.3.0.dir/workload/ray-tracing/TheNextWeek/main.cc.o 
/home/botworker/bbot/clang-hip-vega20/botworker/clang-hip-vega20/llvm/bin/clang++ -DNDEBUG  -O3 -DNDEBUG   -w -Werror=date-time --rocm-path=/opt/botworker/llvm/External/hip/rocm-6.3.0 --offload-arch=gfx908 --offload-arch=gfx90a --offload-arch=gfx1030 --offload-arch=gfx1100 -xhip -mfma -MD -MT External/HIP/CMakeFiles/TheNextWeek-hip-6.3.0.dir/workload/ray-tracing/TheNextWeek/main.cc.o -MF External/HIP/CMakeFiles/TheNextWeek-hip-6.3.0.dir/workload/ray-tracing/TheNextWeek/main.cc.o.d -o External/HIP/CMakeFiles/TheNextWeek-hip-6.3.0.dir/workload/ray-tracing/TheNextWeek/main.cc.o -c /home/botworker/bbot/clang-hip-vega20/llvm-test-suite/External/HIP/workload/ray-tracing/TheNextWeek/main.cc
fatal error: error in backend: Cannot select: intrinsic %llvm.amdgcn.readfirstlane
```

Author: rovka

llvm/include/llvm/IR/IntrinsicsAMDGPU.td

@@ -2671,18 +2671,6 @@ def int_amdgcn_cs_chain:
             ],
             [IntrConvergent, IntrNoReturn, ImmArg<ArgIndex<4>>]>;
 
-// Run a function with all the lanes enabled. Only direct calls are allowed. The
-// first argument is the callee, which must have the `amdgpu_gfx_whole_wave`
-// calling convention and must not be variadic. The remaining arguments to the
-// callee are taken from the arguments passed to the intrinsic. Lanes that are
-// inactive at the point of the call will receive poison. The return value is
-// the return value of the callee for the active lanes (there is no return
-// value in the inactive ones).
-def int_amdgcn_call_whole_wave:
-  Intrinsic<[llvm_any_ty],    // The return type of the callee.
-            [llvm_anyptr_ty,  // The callee.
-             llvm_vararg_ty], // The arguments to the callee.
-            [IntrConvergent]>;
 
 //===----------------------------------------------------------------------===//
 // CI+ Intrinsics

llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp

@@ -2556,7 +2556,6 @@ bool IRTranslator::translateKnownIntrinsic(const CallInst &CI, Intrinsic::ID ID,
                          getOrCreateVReg(*ConstantInt::getTrue(CI.getType())));
     return true;
   case Intrinsic::amdgcn_cs_chain:
-  case Intrinsic::amdgcn_call_whole_wave:
     return translateCallBase(CI, MIRBuilder);
   case Intrinsic::fptrunc_round: {
     uint32_t Flags = MachineInstr::copyFlagsFromInstruction(CI);

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

@@ -7984,43 +7984,6 @@ void SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I,
     HasTailCall = true;
     return;
   }
-  case Intrinsic::amdgcn_call_whole_wave: {
-    TargetLowering::ArgListTy Args;
-
-    // The first argument is the callee. Skip it when assembling the call args.
-    TargetLowering::ArgListEntry Arg;
-    for (unsigned Idx = 1; Idx < I.arg_size(); ++Idx) {
-      Arg.Node = getValue(I.getArgOperand(Idx));
-      Arg.Ty = I.getArgOperand(Idx)->getType();
-      Arg.setAttributes(&I, Idx);
-      Args.push_back(Arg);
-    }
-
-    SDValue ConvControlToken;
-    if (auto Bundle = I.getOperandBundle(LLVMContext::OB_convergencectrl)) {
-      auto *Token = Bundle->Inputs[0].get();
-      ConvControlToken = getValue(Token);
-    }
-
-    TargetLowering::CallLoweringInfo CLI(DAG);
-    CLI.setDebugLoc(getCurSDLoc())
-        .setChain(getRoot())
-        .setCallee(CallingConv::AMDGPU_Gfx_WholeWave, I.getType(),
-                   getValue(I.getArgOperand(0)), std::move(Args))
-        .setTailCall(false)
-        .setIsPreallocated(
-            I.countOperandBundlesOfType(LLVMContext::OB_preallocated) != 0)
-        .setConvergent(I.isConvergent())
-        .setConvergenceControlToken(ConvControlToken);
-    CLI.CB = &I;
-
-    std::pair<SDValue, SDValue> Result =
-        lowerInvokable(CLI, /*EHPadBB=*/nullptr);
-
-    if (Result.first.getNode())
-      setValue(&I, Result.first);
-    return;
-  }
   case Intrinsic::ptrmask: {
     SDValue Ptr = getValue(I.getOperand(0));
     SDValue Mask = getValue(I.getOperand(1));

llvm/lib/IR/Verifier.cpp

@@ -6612,36 +6612,6 @@ void Verifier::visitIntrinsicCall(Intrinsic::ID ID, CallBase &Call) {
           "Value for inactive lanes must be a VGPR function argument", &Call);
     break;
   }
-  case Intrinsic::amdgcn_call_whole_wave: {
-    auto F = dyn_cast<Function>(Call.getArgOperand(0));
-    Check(F, "Indirect whole wave calls are not allowed", &Call);
-
-    CallingConv::ID CC = F->getCallingConv();
-    Check(CC == CallingConv::AMDGPU_Gfx_WholeWave,
-          "Callee must have the amdgpu_gfx_whole_wave calling convention",
-          &Call);
-
-    Check(!F->isVarArg(), "Variadic whole wave calls are not allowed", &Call);
-
-    Check(Call.arg_size() == F->arg_size(),
-          "Call argument count must match callee argument count", &Call);
-
-    // The first argument of the call is the callee, and the first argument of
-    // the callee is the active mask. The rest of the arguments must match.
-    Check(F->arg_begin()->getType()->isIntegerTy(1),
-          "Callee must have i1 as its first argument", &Call);
-    for (auto [CallArg, FuncArg] :
-         drop_begin(zip_equal(Call.args(), F->args()))) {
-      Check(CallArg->getType() == FuncArg.getType(),
-            "Argument types must match", &Call);
-
-      // Check that inreg attributes match between call site and function
-      Check(Call.paramHasAttr(FuncArg.getArgNo(), Attribute::InReg) ==
-                FuncArg.hasInRegAttr(),
-            "Argument inreg attributes must match", &Call);
-    }
-    break;
-  }
   case Intrinsic::amdgcn_s_prefetch_data: {
     Check(
         AMDGPU::isFlatGlobalAddrSpace(

llvm/lib/Target/AMDGPU/AMDGPUCallLowering.cpp

@@ -1464,22 +1464,9 @@ bool AMDGPUCallLowering::lowerCall(MachineIRBuilder &MIRBuilder,
                                    CallLoweringInfo &Info) const {
   if (Function *F = Info.CB->getCalledFunction())
     if (F->isIntrinsic()) {
-      switch (F->getIntrinsicID()) {
-      case Intrinsic::amdgcn_cs_chain:
-        return lowerChainCall(MIRBuilder, Info);
-      case Intrinsic::amdgcn_call_whole_wave:
-        Info.CallConv = CallingConv::AMDGPU_Gfx_WholeWave;
-
-        // Get the callee from the original instruction, so it doesn't look like
-        // this is an indirect call.
-        Info.Callee = MachineOperand::CreateGA(
-            cast<GlobalValue>(Info.CB->getOperand(0)), /*Offset=*/0);
-        Info.OrigArgs.erase(Info.OrigArgs.begin());
-        Info.IsVarArg = false;
-        break;
-      default:
-        llvm_unreachable("Unexpected intrinsic call");
-      }
+      assert(F->getIntrinsicID() == Intrinsic::amdgcn_cs_chain &&
+             "Unexpected intrinsic");
+      return lowerChainCall(MIRBuilder, Info);
     }
 
   if (Info.IsVarArg) {

llvm/test/CodeGen/AMDGPU/amdgcn-call-whole-wave.ll

@@ -101,29 +101,3 @@ define amdgpu_gfx_whole_wave i64 @ret_64(i1 %active, i64 %a, i64 %b) {
   %ret = call i64 @llvm.amdgcn.update.dpp.i64(i64 %x, i64 %y, i32 1, i32 1, i32 1, i1 false)
   ret i64 %ret
 }
-
-declare amdgpu_gfx_whole_wave i32 @callee(i1 %active, i32 %x)
-
-; Make sure we don't pass the first argument (i1).
-define amdgpu_cs void @call(i32 %x, ptr %p) {
-  ; CHECK-LABEL: name: call
-  ; CHECK: bb.1 (%ir-block.0):
-  ; CHECK-NEXT:   liveins: $vgpr0, $vgpr1, $vgpr2
-  ; CHECK-NEXT: {{  $}}
-  ; CHECK-NEXT:   [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
-  ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:_(s32) = COPY $vgpr1
-  ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:_(s32) = COPY $vgpr2
-  ; CHECK-NEXT:   [[MV:%[0-9]+]]:_(p0) = G_MERGE_VALUES [[COPY1]](s32), [[COPY2]](s32)
-  ; CHECK-NEXT:   [[GV:%[0-9]+]]:_(p0) = G_GLOBAL_VALUE @callee
-  ; CHECK-NEXT:   ADJCALLSTACKUP 0, 0, implicit-def $scc
-  ; CHECK-NEXT:   [[GV1:%[0-9]+]]:_(p0) = G_GLOBAL_VALUE @callee
-  ; CHECK-NEXT:   $vgpr0 = COPY [[COPY]](s32)
-  ; CHECK-NEXT:   $sgpr30_sgpr31 = G_SI_CALL [[GV1]](p0), @callee, csr_amdgpu_si_gfx, implicit $vgpr0, implicit-def $vgpr0
-  ; CHECK-NEXT:   [[COPY3:%[0-9]+]]:_(s32) = COPY $vgpr0
-  ; CHECK-NEXT:   ADJCALLSTACKDOWN 0, 0, implicit-def $scc
-  ; CHECK-NEXT:   G_STORE [[COPY3]](s32), [[MV]](p0) :: (store (s32) into %ir.p)
-  ; CHECK-NEXT:   S_ENDPGM 0
-  %ret = call i32(ptr, ...) @llvm.amdgcn.call.whole.wave(ptr @callee, i32 %x) convergent
-  store i32 %ret, ptr %p
-  ret void
-}