[PATCH] D82652: AMDGPU/GlobalISel: Select icmp intrinsic

[Petar Avramovic via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rGd7173826331e: AMDGPU/GlobalISel: Select icmp intrinsic (authored by Petar.Avramovic).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D82652/new/

https://reviews.llvm.org/D82652

Files:
  llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
  llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.icmp.ll


Index: llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.icmp.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.icmp.ll
@@ -0,0 +1,32 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -global-isel -global-isel-abort=1 -march=amdgcn -mcpu=gfx1010 -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
+
+define amdgpu_ps void @test_intr_icmp_eq_i64(i64 addrspace(1)* %out, i32 %src) #0 {
+; GCN-LABEL: test_intr_icmp_eq_i64:
+; GCN:       ; %bb.0:
+; GCN-NEXT:    v_cmp_eq_u32_e64 s[0:1], 0x64, v2
+; GCN-NEXT:    v_mov_b32_e32 v3, s1
+; GCN-NEXT:    v_mov_b32_e32 v2, s0
+; GCN-NEXT:    global_store_dwordx2 v[0:1], v[2:3], off
+; GCN-NEXT:    s_endpgm
+  %result = call i64 @llvm.amdgcn.icmp.i64.i32(i32 %src, i32 100, i32 32)
+  store i64 %result, i64 addrspace(1)* %out
+  ret void
+}
+
+define amdgpu_ps void @test_intr_icmp_ne_i32(i32 addrspace(1)* %out, i32 %src) #1 {
+; GCN-LABEL: test_intr_icmp_ne_i32:
+; GCN:       ; %bb.0:
+; GCN-NEXT:    v_cmp_ne_u32_e64 s0, 0x64, v2
+; GCN-NEXT:    ; implicit-def: $vcc_hi
+; GCN-NEXT:    v_mov_b32_e32 v2, s0
+; GCN-NEXT:    global_store_dword v[0:1], v2, off
+; GCN-NEXT:    s_endpgm
+  %result = call i32 @llvm.amdgcn.icmp.i32.i32(i32 %src, i32 100, i32 33)
+  store i32 %result, i32 addrspace(1)* %out
+  ret void
+}
+declare i64 @llvm.amdgcn.icmp.i64.i32(i32, i32, i32)
+declare i32 @llvm.amdgcn.icmp.i32.i32(i32, i32, i32)
+attributes #0 = { "target-features"="+wavefrontsize64" }
+attributes #1 = { "target-features"="+wavefrontsize32" }
Index: llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
===================================================================
--- llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
+++ llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
@@ -106,6 +106,7 @@
 
   bool selectInterpP1F16(MachineInstr &MI) const;
   bool selectDivScale(MachineInstr &MI) const;
+  bool selectIntrinsicIcmp(MachineInstr &MI) const;
   bool selectG_INTRINSIC(MachineInstr &I) const;
 
   bool selectEndCfIntrinsic(MachineInstr &MI) const;
Index: llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
===================================================================
--- llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
+++ llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
@@ -889,6 +889,8 @@
     return constrainCopyLikeIntrin(I, AMDGPU::WWM);
   case Intrinsic::amdgcn_div_scale:
     return selectDivScale(I);
+  case Intrinsic::amdgcn_icmp:
+    return selectIntrinsicIcmp(I);
   default:
     return selectImpl(I, *CoverageInfo);
   }
@@ -1009,6 +1011,34 @@
   return Ret;
 }
 
+bool AMDGPUInstructionSelector::selectIntrinsicIcmp(MachineInstr &I) const {
+  Register Dst = I.getOperand(0).getReg();
+  if (isVCC(Dst, *MRI))
+    return false;
+
+  if (MRI->getType(Dst).getSizeInBits() != STI.getWavefrontSize())
+    return false;
+
+  MachineBasicBlock *BB = I.getParent();
+  const DebugLoc &DL = I.getDebugLoc();
+  Register SrcReg = I.getOperand(2).getReg();
+  unsigned Size = RBI.getSizeInBits(SrcReg, *MRI, TRI);
+  auto Pred = static_cast<CmpInst::Predicate>(I.getOperand(4).getImm());
+
+  int Opcode = getV_CMPOpcode(Pred, Size);
+  if (Opcode == -1)
+    return false;
+
+  MachineInstr *ICmp = BuildMI(*BB, &I, DL, TII.get(Opcode), Dst)
+                           .add(I.getOperand(2))
+                           .add(I.getOperand(3));
+  RBI.constrainGenericRegister(ICmp->getOperand(0).getReg(), *TRI.getBoolRC(),
+                               *MRI);
+  bool Ret = constrainSelectedInstRegOperands(*ICmp, TII, TRI, RBI);
+  I.eraseFromParent();
+  return Ret;
+}
+
 bool AMDGPUInstructionSelector::selectEndCfIntrinsic(MachineInstr &MI) const {
   // FIXME: Manually selecting to avoid dealiing with the SReg_1 trick
   // SelectionDAG uses for wave32 vs wave64.


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