================
@@ -2925,6 +2925,54 @@ bool RISCVDAGToDAGISel::SelectAddrRegImm(SDValue Addr,
SDValue &Base,
return true;
}
+/// Similar to SelectAddrRegImm, except that the offset restricted for
+/// nine bits.
+bool RISCVDAGToDAGISel::SelectAddrRegImm9(SDValue Addr, SDValue &Base,
+ SDValue &Offset) {
+ if (SelectAddrFrameIndex(Addr, Base, Offset))
+ return true;
+
+ SDLoc DL(Addr);
+ MVT VT = Addr.getSimpleValueType();
+
+ if (CurDAG->isBaseWithConstantOffset(Addr)) {
+
+ int64_t CVal = cast<ConstantSDNode>(Addr.getOperand(1))->getSExtValue();
+ if (isUInt<9>(CVal)) {
+ Base = Addr.getOperand(0);
+
+ if (auto *FIN = dyn_cast<FrameIndexSDNode>(Base))
+ Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), VT);
+ Offset = CurDAG->getSignedTargetConstant(CVal, DL, VT);
+ return true;
+ }
+
+ // Handle with 12 bit ofset immediates with ADDI.
+ else if (Addr.getOpcode() == ISD::ADD &&
+ isa<ConstantSDNode>(Addr.getOperand(1))) {
+ int64_t CVal = cast<ConstantSDNode>(Addr.getOperand(1))->getSExtValue();
+ assert(!isUInt<9>(CVal) && "uimm9 not already handled?");
+
+ if (isUInt<12>(CVal)) {
----------------
topperc wrote:
You can't make an ADDI with an unsigned 12 bit immediate. It needs to be sign
12-bit immediate.
But I'm to sure why this code is needed. Isn't this just what isel would do if
you didn't match the ADD?
https://github.com/llvm/llvm-project/pull/145647
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