diff --git a/llvm/lib/Target/XCore/XCoreISelDAGToDAG.cpp b/llvm/lib/Target/XCore/XCoreISelDAGToDAG.cpp index a8dd8479d45f..4dac1cee9827 100644 --- a/llvm/lib/Target/XCore/XCoreISelDAGToDAG.cpp +++ b/llvm/lib/Target/XCore/XCoreISelDAGToDAG.cpp @@ -169,9 +169,14 @@ SDNode *XCoreDAGToDAGISel::Select(SDNode *N) { CurDAG->getTargetConstantPool(ConstantInt::get( Type::getInt32Ty(*CurDAG->getContext()), Val), TLI.getPointerTy()); - return CurDAG->getMachineNode(XCore::LDWCP_lru6, dl, MVT::i32, - MVT::Other, CPIdx, - CurDAG->getEntryNode()); + SDNode *node = CurDAG->getMachineNode(XCore::LDWCP_lru6, dl, MVT::i32, + MVT::Other, CPIdx, + CurDAG->getEntryNode()); + MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1); + MemOp[0] = MF->getMachineMemOperand( + MachinePointerInfo::getConstantPool(), MachineMemOperand::MOLoad, 4, 4); + cast(node)->setMemRefs(MemOp, MemOp + 1); + return node; } break; } diff --git a/llvm/test/CodeGen/XCore/licm-ldwcp.ll b/llvm/test/CodeGen/XCore/licm-ldwcp.ll new file mode 100644 index 000000000000..4884f70e736b --- /dev/null +++ b/llvm/test/CodeGen/XCore/licm-ldwcp.ll @@ -0,0 +1,18 @@ +; RUN: llc < %s -march=xcore -asm-verbose=0 | FileCheck %s + +; MachineLICM should hoist the LDWCP out of the loop. + +; CHECK: f: +; CHECK-NEXT: ldw [[REG:r[0-9]+]], cp[.LCPI0_0] +; CHECK-NEXT: .LBB0_1: +; CHECK-NEXT: stw [[REG]], r0[0] +; CHECK-NEXT: bu .LBB0_1 + +define void @f(i32* nocapture %p) noreturn nounwind { +entry: + br label %bb + +bb: ; preds = %bb, %entry + volatile store i32 525509670, i32* %p, align 4 + br label %bb +}