================
@@ -63,4 +70,189 @@ char &llvm::AMDGPURBSelectID = AMDGPURBSelect::ID;
FunctionPass *llvm::createAMDGPURBSelectPass() { return new AMDGPURBSelect(); }
-bool AMDGPURBSelect::runOnMachineFunction(MachineFunction &MF) { return true; }
+bool shouldRBSelect(MachineInstr &MI) {
+ if (isTargetSpecificOpcode(MI.getOpcode()) && !MI.isPreISelOpcode())
+ return false;
+
+ if (MI.getOpcode() == AMDGPU::PHI || MI.getOpcode() == AMDGPU::IMPLICIT_DEF)
+ return false;
+
+ if (MI.isInlineAsm())
+ return false;
+
+ return true;
+}
+
+void setRB(MachineInstr &MI, MachineOperand &DefOP, MachineIRBuilder B,
+ MachineRegisterInfo &MRI, const RegisterBank &RB) {
+ Register Reg = DefOP.getReg();
+ // Register that already has Register class got it during pre-inst selection
+ // of another instruction. Maybe cross bank copy was required so we insert a
+ // copy trat can be removed later. This simplifies post-rb-legalize artifact
+ // combiner and avoids need to special case some patterns.
+ if (MRI.getRegClassOrNull(Reg)) {
+ LLT Ty = MRI.getType(Reg);
+ Register NewReg = MRI.createVirtualRegister({&RB, Ty});
+ DefOP.setReg(NewReg);
+
+ auto &MBB = *MI.getParent();
+ B.setInsertPt(MBB, MI.isPHI() ? MBB.getFirstNonPHI()
+ : std::next(MI.getIterator()));
----------------
rovka wrote:
Can you use skipPHIsAndLabels(std:next...) here too?
https://github.com/llvm/llvm-project/pull/112863
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