[llvm-commits] [llvm] r75908 - in /llvm/trunk: lib/Target/XCore/XCoreISelLowering.cpp lib/Target/XCore/XCoreISelLowering.h test/CodeGen/XCore/unaligned_store_combine.ll

[Richard Osborne]

Author: friedgold
Date: Thu Jul 16 07:50:48 2009
New Revision: 75908

URL: http://llvm.org/viewvc/llvm-project?rev=75908&view=rev
Log:
Combine an unaligned store of unaligned load into a memmove.

Added:
    llvm/trunk/test/CodeGen/XCore/unaligned_store_combine.ll
Modified:
    llvm/trunk/lib/Target/XCore/XCoreISelLowering.cpp
    llvm/trunk/lib/Target/XCore/XCoreISelLowering.h

Modified: llvm/trunk/lib/Target/XCore/XCoreISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/XCore/XCoreISelLowering.cpp?rev=75908&r1=75907&r2=75908&view=diff

==============================================================================
--- llvm/trunk/lib/Target/XCore/XCoreISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/XCore/XCoreISelLowering.cpp Thu Jul 16 07:50:48 2009
@@ -153,6 +153,9 @@
 
   maxStoresPerMemset = 4;
   maxStoresPerMemmove = maxStoresPerMemcpy = 2;
+
+  // We have target-specific dag combine patterns for the following nodes:
+  setTargetDAGCombine(ISD::STORE);
 }
 
 SDValue XCoreTargetLowering::
@@ -1050,6 +1053,55 @@
 }
 
 //===----------------------------------------------------------------------===//
+// Target Optimization Hooks
+//===----------------------------------------------------------------------===//
+
+SDValue XCoreTargetLowering::PerformDAGCombine(SDNode *N,
+                                             DAGCombinerInfo &DCI) const {
+  SelectionDAG &DAG = DCI.DAG;
+  DebugLoc dl = N->getDebugLoc();
+  switch (N->getOpcode()) {
+  default: break;
+  case ISD::STORE: {
+    // Replace unaligned store of unaligned load with memmove.
+    StoreSDNode *ST  = cast<StoreSDNode>(N);
+    if (!DCI.isBeforeLegalize() || allowsUnalignedMemoryAccesses() ||
+        ST->isVolatile() || ST->isIndexed()) {
+      break;
+    }
+    SDValue Chain = ST->getChain();
+
+    unsigned StoreBits = ST->getMemoryVT().getStoreSizeInBits();
+    if (StoreBits % 8) {
+      break;
+    }
+    unsigned ABIAlignment = getTargetData()->
+      getABITypeAlignment(ST->getMemoryVT().getTypeForMVT(*DAG.getContext()));
+    unsigned Alignment = ST->getAlignment();
+    if (Alignment >= ABIAlignment) {
+      break;
+    }
+
+    if (LoadSDNode *LD = dyn_cast<LoadSDNode>(ST->getValue())) {
+      if (LD->hasNUsesOfValue(1, 0) && ST->getMemoryVT() == LD->getMemoryVT() &&
+        LD->getAlignment() == Alignment &&
+        !LD->isVolatile() && !LD->isIndexed() &&
+        Chain.reachesChainWithoutSideEffects(SDValue(LD, 1))) {
+        return DAG.getMemmove(Chain, dl, ST->getBasePtr(),
+                              LD->getBasePtr(),
+                              DAG.getConstant(StoreBits/8, MVT::i32),
+                              Alignment, ST->getSrcValue(),
+                              ST->getSrcValueOffset(), LD->getSrcValue(),
+                              LD->getSrcValueOffset());
+      }
+    }
+    break;
+  }
+  }
+  return SDValue();
+}
+
+//===----------------------------------------------------------------------===//
 //  Addressing mode description hooks
 //===----------------------------------------------------------------------===//
 

Modified: llvm/trunk/lib/Target/XCore/XCoreISelLowering.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/XCore/XCoreISelLowering.h?rev=75908&r1=75907&r2=75908&view=diff

==============================================================================
--- llvm/trunk/lib/Target/XCore/XCoreISelLowering.h (original)
+++ llvm/trunk/lib/Target/XCore/XCoreISelLowering.h Thu Jul 16 07:50:48 2009
@@ -122,6 +122,8 @@
   
     // Expand specifics
     SDValue ExpandADDSUB(SDNode *Op, SelectionDAG &DAG);
+
+    virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
   };
 }
 

Added: llvm/trunk/test/CodeGen/XCore/unaligned_store_combine.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/XCore/unaligned_store_combine.ll?rev=75908&view=auto

==============================================================================
--- llvm/trunk/test/CodeGen/XCore/unaligned_store_combine.ll (added)
+++ llvm/trunk/test/CodeGen/XCore/unaligned_store_combine.ll Thu Jul 16 07:50:48 2009
@@ -0,0 +1,12 @@
+; RUN: llvm-as < %s | llc -march=xcore > %t1.s
+; RUN: grep "bl memmove" %t1.s | count 1
+; RUN: grep "ldc r., 8" %t1.s | count 1
+
+; Unaligned load / store pair. Should be combined into a memmove
+; of size 8
+define void @f(i64* %dst, i64* %src) nounwind {
+entry:
+	%0 = load i64* %src, align 1
+	store i64 %0, i64* %dst, align 1
+	ret void
+}