From a1d16b53e847a97846ad5df293ae1cfc3091a092 Mon Sep 17 00:00:00 2001
From: Richard Osborne <richard@xmos.com>
Date: Mon, 12 Sep 2011 14:43:23 +0000
Subject: [PATCH] Associate a MemOperand with LDWCP nodes introduced during
 ISel.

This information is required if we want LDWCP to be hoisted out of loops.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139495 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/XCore/XCoreISelDAGToDAG.cpp | 11 ++++++++---
 test/CodeGen/XCore/licm-ldwcp.ll       | 18 ++++++++++++++++++
 2 files changed, 26 insertions(+), 3 deletions(-)
 create mode 100644 test/CodeGen/XCore/licm-ldwcp.ll

diff --git a/lib/Target/XCore/XCoreISelDAGToDAG.cpp b/lib/Target/XCore/XCoreISelDAGToDAG.cpp
index a8dd8479d45..4dac1cee982 100644
--- a/lib/Target/XCore/XCoreISelDAGToDAG.cpp
+++ b/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<MachineSDNode>(node)->setMemRefs(MemOp, MemOp + 1);
+      return node;
     }
     break;
   }
diff --git a/test/CodeGen/XCore/licm-ldwcp.ll b/test/CodeGen/XCore/licm-ldwcp.ll
new file mode 100644
index 00000000000..4884f70e736
--- /dev/null
+++ b/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
+}