[X86][Haswell][SchedModel] Add architecture specific scheduling models.

[oota-llvm.git] / lib / Target / SystemZ / SystemZSelectionDAGInfo.cpp

diff --git a/lib/Target/SystemZ/SystemZSelectionDAGInfo.cpp b/lib/Target/SystemZ/SystemZSelectionDAGInfo.cpp
index dc2f225acb285c4200471e2b0626ee35417a8891..a3cba64b9ed209fee8316637e8eec8953ddaa241 100644 (file)
--- a/lib/Target/SystemZ/SystemZSelectionDAGInfo.cpp
+++ b/lib/Target/SystemZ/SystemZSelectionDAGInfo.cpp
@@ -11,24 +11,27 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE "systemz-selectiondag-info"
 #include "SystemZTargetMachine.h"
 #include "llvm/CodeGen/SelectionDAG.h"
 
 using namespace llvm;
 
-SystemZSelectionDAGInfo::
-SystemZSelectionDAGInfo(const SystemZTargetMachine &TM)
-  : TargetSelectionDAGInfo(TM) {
-}
+#define DEBUG_TYPE "systemz-selectiondag-info"
+
+SystemZSelectionDAGInfo::SystemZSelectionDAGInfo(const DataLayout &DL)
+    : TargetSelectionDAGInfo(&DL) {}
 
 SystemZSelectionDAGInfo::~SystemZSelectionDAGInfo() {
 }
 
-// Use MVC to copy Size bytes from Src to Dest, deciding whether to use
-// a loop or straight-line code.
-static SDValue emitMVC(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
-                       SDValue Dst, SDValue Src, uint64_t Size) {
+// Decide whether it is best to use a loop or straight-line code for
+// a block operation of Size bytes with source address Src and destination
+// address Dest.  Sequence is the opcode to use for straight-line code
+// (such as MVC) and Loop is the opcode to use for loops (such as MVC_LOOP).
+// Return the chain for the completed operation.
+static SDValue emitMemMem(SelectionDAG &DAG, SDLoc DL, unsigned Sequence,
+                          unsigned Loop, SDValue Chain, SDValue Dst,
+                          SDValue Src, uint64_t Size) {
   EVT PtrVT = Src.getValueType();
   // The heuristic we use is to prefer loops for anything that would
   // require 7 or more MVCs.  With these kinds of sizes there isn't
@@ -42,10 +45,10 @@ static SDValue emitMVC(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
   // The next value up, 6 * 256, can be implemented in the same
   // number of straight-line MVCs as 6 * 256 - 1.
   if (Size > 6 * 256)
-    return DAG.getNode(SystemZISD::MVC_LOOP, DL, MVT::Other, Chain, Dst, Src,
+    return DAG.getNode(Loop, DL, MVT::Other, Chain, Dst, Src,
                        DAG.getConstant(Size, PtrVT),
                        DAG.getConstant(Size / 256, PtrVT));
-  return DAG.getNode(SystemZISD::MVC, DL, MVT::Other, Chain, Dst, Src,
+  return DAG.getNode(Sequence, DL, MVT::Other, Chain, Dst, Src,
                      DAG.getConstant(Size, PtrVT));
 }
 
@@ -58,8 +61,9 @@ EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
   if (IsVolatile)
     return SDValue();
 
-  if (ConstantSDNode *CSize = dyn_cast<ConstantSDNode>(Size))
-    return emitMVC(DAG, DL, Chain, Dst, Src, CSize->getZExtValue());
+  if (auto *CSize = dyn_cast<ConstantSDNode>(Size))
+    return emitMemMem(DAG, DL, SystemZISD::MVC, SystemZISD::MVC_LOOP,
+                      Chain, Dst, Src, CSize->getZExtValue());
   return SDValue();
 }
 
@@ -88,11 +92,11 @@ EmitTargetCodeForMemset(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
   if (IsVolatile)
     return SDValue();
 
-  if (ConstantSDNode *CSize = dyn_cast<ConstantSDNode>(Size)) {
+  if (auto *CSize = dyn_cast<ConstantSDNode>(Size)) {
     uint64_t Bytes = CSize->getZExtValue();
     if (Bytes == 0)
       return SDValue();
-    if (ConstantSDNode *CByte = dyn_cast<ConstantSDNode>(Byte)) {
+    if (auto *CByte = dyn_cast<ConstantSDNode>(Byte)) {
       // Handle cases that can be done using at most two of
       // MVI, MVHI, MVHHI and MVGHI.  The latter two can only be
       // used if ByteVal is all zeros or all ones; in other casees,
@@ -130,13 +134,21 @@ EmitTargetCodeForMemset(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
       }
     }
     assert(Bytes >= 2 && "Should have dealt with 0- and 1-byte cases already");
+
+    // Handle the special case of a memset of 0, which can use XC.
+    auto *CByte = dyn_cast<ConstantSDNode>(Byte);
+    if (CByte && CByte->getZExtValue() == 0)
+      return emitMemMem(DAG, DL, SystemZISD::XC, SystemZISD::XC_LOOP,
+                        Chain, Dst, Dst, Bytes);
+
     // Copy the byte to the first location and then use MVC to copy
     // it to the rest.
     Chain = DAG.getStore(Chain, DL, Byte, Dst, DstPtrInfo,
                          false, false, Align);
     SDValue DstPlus1 = DAG.getNode(ISD::ADD, DL, PtrVT, Dst,
                                    DAG.getConstant(1, PtrVT));
-    return emitMVC(DAG, DL, Chain, DstPlus1, Dst, Bytes - 1);
+    return emitMemMem(DAG, DL, SystemZISD::MVC, SystemZISD::MVC_LOOP,
+                      Chain, DstPlus1, Dst, Bytes - 1);
   }
   return SDValue();
 }
@@ -170,7 +182,7 @@ static SDValue emitCLC(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
 static SDValue addIPMSequence(SDLoc DL, SDValue Glue, SelectionDAG &DAG) {
   SDValue IPM = DAG.getNode(SystemZISD::IPM, DL, MVT::i32, Glue);
   SDValue SRL = DAG.getNode(ISD::SRL, DL, MVT::i32, IPM,
-                            DAG.getConstant(28, MVT::i32));
+                            DAG.getConstant(SystemZ::IPM_CC, MVT::i32));
   SDValue ROTL = DAG.getNode(ISD::ROTL, DL, MVT::i32, SRL,
                              DAG.getConstant(31, MVT::i32));
   return ROTL;
@@ -181,7 +193,7 @@ EmitTargetCodeForMemcmp(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
                         SDValue Src1, SDValue Src2, SDValue Size,
                         MachinePointerInfo Op1PtrInfo,
                         MachinePointerInfo Op2PtrInfo) const {
-  if (ConstantSDNode *CSize = dyn_cast<ConstantSDNode>(Size)) {
+  if (auto *CSize = dyn_cast<ConstantSDNode>(Size)) {
     uint64_t Bytes = CSize->getZExtValue();
     assert(Bytes > 0 && "Caller should have handled 0-size case");
     Chain = emitCLC(DAG, DL, Chain, Src1, Src2, Bytes);
@@ -217,7 +229,7 @@ EmitTargetCodeForMemchr(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
   Ops.push_back(DAG.getConstant(SystemZ::CCMASK_SRST_FOUND, MVT::i32));
   Ops.push_back(Glue);
   VTs = DAG.getVTList(PtrVT, MVT::Glue);
-  End = DAG.getNode(SystemZISD::SELECT_CCMASK, DL, VTs, &Ops[0], Ops.size());
+  End = DAG.getNode(SystemZISD::SELECT_CCMASK, DL, VTs, Ops);
   return std::make_pair(End, Chain);
 }