================
@@ -37,6 +37,97 @@ bool
RegBankLegalizeHelper::findRuleAndApplyMapping(MachineInstr &MI) {
return true;
}
+void RegBankLegalizeHelper::splitLoad(MachineInstr &MI,
+ ArrayRef<LLT> LLTBreakdown, LLT MergeTy)
{
+ MachineFunction &MF = B.getMF();
+ assert(MI.getNumMemOperands() == 1);
+ MachineMemOperand &BaseMMO = **MI.memoperands_begin();
+ Register Dst = MI.getOperand(0).getReg();
+ const RegisterBank *DstRB = MRI.getRegBankOrNull(Dst);
+ Register BasePtrReg = MI.getOperand(1).getReg();
+ LLT PtrTy = MRI.getType(BasePtrReg);
+ const RegisterBank *PtrRB = MRI.getRegBankOrNull(BasePtrReg);
+ LLT OffsetTy = LLT::scalar(PtrTy.getSizeInBits());
+ SmallVector<Register, 4> LoadPartRegs;
+
+ unsigned ByteOffset = 0;
+ for (LLT PartTy : LLTBreakdown) {
+ Register BasePtrPlusOffsetReg;
+ if (ByteOffset == 0) {
+ BasePtrPlusOffsetReg = BasePtrReg;
+ } else {
+ BasePtrPlusOffsetReg = MRI.createVirtualRegister({PtrRB, PtrTy});
+ Register OffsetReg = MRI.createVirtualRegister({PtrRB, OffsetTy});
+ B.buildConstant(OffsetReg, ByteOffset);
+ B.buildPtrAdd(BasePtrPlusOffsetReg, BasePtrReg, OffsetReg);
----------------
arsenm wrote:
Would be nice if we could fold createVirtualRegister with bank into the build*
methods
https://github.com/llvm/llvm-project/pull/112882
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