[llvm] [LLVM] Make use of s_flbit_i32_b64 and s_ff1_i32_b64 (PR #75158)

[Thomas Symalla via llvm-commits]

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@@ -7834,6 +7843,56 @@ void SIInstrInfo::splitScalar64BitBFE(SIInstrWorklist &Worklist,
   addUsersToMoveToVALUWorklist(ResultReg, MRI, Worklist);
 }
 
+void SIInstrInfo::splitScalar64BitCountOp(SIInstrWorklist &Worklist,
+                                          MachineInstr &Instr, unsigned Opcode,
+                                          MachineDominatorTree *MDT) const {
+  MachineBasicBlock &MBB = *Instr.getParent();
+  MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
+
+  MachineBasicBlock::iterator MII = Instr;
+  const DebugLoc &DL = Instr.getDebugLoc();
+
+  MachineOperand &Dest = Instr.getOperand(0);
+  MachineOperand &Src = Instr.getOperand(1);
+
+  const MCInstrDesc &InstDesc = get(Opcode);
+  bool isCtlz = Opcode == AMDGPU::S_FLBIT_I32_B32;
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tsymalla wrote:

Should start with capital `I` (`IsCtlz`)

https://github.com/llvm/llvm-project/pull/75158