}
}
} else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
- // Loading from a constant address.
-
- // If this address fits entirely in a 14-bit sext immediate field, codegen
- // this as "d, 0"
- short Imm;
- if (isIntS16Immediate(CN, Imm)) {
- Disp = DAG.getTargetConstant((unsigned short)Imm >> 2, getPointerTy());
- Base = DAG.getRegister(PPC::R0, CN->getValueType(0));
- return true;
- }
+ // Loading from a constant address. Verify low two bits are clear.
+ if ((CN->getValue() & 3) == 0) {
+ // If this address fits entirely in a 14-bit sext immediate field, codegen
+ // this as "d, 0"
+ short Imm;
+ if (isIntS16Immediate(CN, Imm)) {
+ Disp = DAG.getTargetConstant((unsigned short)Imm >> 2, getPointerTy());
+ Base = DAG.getRegister(PPC::R0, CN->getValueType(0));
+ return true;
+ }
- // FIXME: Handle small sext constant offsets in PPC64 mode also!
- if (CN->getValueType(0) == MVT::i32) {
- int Addr = (int)CN->getValue();
+ // Fold the low-part of 32-bit absolute addresses into addr mode.
+ if (CN->getValueType(0) == MVT::i32 ||
+ (int64_t)CN->getValue() == (int)CN->getValue()) {
+ int Addr = (int)CN->getValue();
- // Otherwise, break this down into an LIS + disp.
- Disp = DAG.getTargetConstant((short)Addr >> 2, MVT::i32);
- Base = DAG.getConstant(Addr - (signed short)Addr, MVT::i32);
- return true;
+ // Otherwise, break this down into an LIS + disp.
+ Disp = DAG.getTargetConstant((short)Addr >> 2, MVT::i32);
+
+ Base = DAG.getTargetConstant((Addr-(signed short)Addr) >> 16, MVT::i32);
+ unsigned Opc = CN->getValueType(0) == MVT::i32 ? PPC::LIS : PPC::LIS8;
+ Base = SDOperand(DAG.getTargetNode(Opc, CN->getValueType(0), Base), 0);
+ return true;
+ }
}
}