PPC/s390: [wasm] Trim graph before scheduling.

src/compiler/s390/instruction-selector-s390.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 #include "src/s390/frames-s390.h"
 
@@ skipping 817 matching lines @@
     } else if (mleft.right().Is(24) && m.right().Is(24)) {
       Emit(kS390_ExtendSignWord8, g.DefineAsRegister(node),
            g.UseRegister(mleft.left().node()));
       return;
     }
   }
   VisitRRO(this, kS390_ShiftRightArith32, node, kShift32Imm);
 }
 
 #if !V8_TARGET_ARCH_S390X
-void VisitPairBinop(InstructionSelector* selector, ArchOpcode opcode,
-                    Node* node) {
+void VisitPairBinop(InstructionSelector* selector, InstructionCode opcode,
+                    InstructionCode opcode2, Node* node) {
   S390OperandGenerator g(selector);
 
-  // We use UseUniqueRegister here to avoid register sharing with the output
-  // registers.
-  InstructionOperand inputs[] = {
-      g.UseRegister(node->InputAt(0)), g.UseUniqueRegister(node->InputAt(1)),
-      g.UseRegister(node->InputAt(2)), g.UseUniqueRegister(node->InputAt(3))};
+  Node* projection1 = NodeProperties::FindProjection(node, 1);
+  if (projection1) {
+    // We use UseUniqueRegister here to avoid register sharing with the output
+    // registers.
+    InstructionOperand inputs[] = {
+        g.UseRegister(node->InputAt(0)), g.UseUniqueRegister(node->InputAt(1)),
+        g.UseRegister(node->InputAt(2)), g.UseUniqueRegister(node->InputAt(3))};
 
-  InstructionOperand outputs[] = {
-      g.DefineAsRegister(node),
-      g.DefineAsRegister(NodeProperties::FindProjection(node, 1))};
+    InstructionOperand outputs[] = {
+        g.DefineAsRegister(node),
+        g.DefineAsRegister(NodeProperties::FindProjection(node, 1))};
 
-  selector->Emit(opcode, 2, outputs, 4, inputs);
+    selector->Emit(opcode, 2, outputs, 4, inputs);
+  } else {
+    // The high word of the result is not used, so we emit the standard 32 bit
+    // instruction.
+    selector->Emit(opcode2, g.DefineSameAsFirst(node),
+                   g.UseRegister(node->InputAt(0)),
+                   g.UseRegister(node->InputAt(2)));
+  }
 }
 
 void InstructionSelector::VisitInt32PairAdd(Node* node) {
-  VisitPairBinop(this, kS390_AddPair, node);
+  VisitPairBinop(this, kS390_AddPair, kS390_Add32, node);
 }
 
 void InstructionSelector::VisitInt32PairSub(Node* node) {
-  VisitPairBinop(this, kS390_SubPair, node);
+  VisitPairBinop(this, kS390_SubPair, kS390_Sub32, node);
 }
 
 void InstructionSelector::VisitInt32PairMul(Node* node) {
   S390OperandGenerator g(this);
-  InstructionOperand inputs[] = {g.UseUniqueRegister(node->InputAt(0)),
-                                 g.UseUniqueRegister(node->InputAt(1)),
-                                 g.UseUniqueRegister(node->InputAt(2)),
-                                 g.UseUniqueRegister(node->InputAt(3))};
+  Node* projection1 = NodeProperties::FindProjection(node, 1);
+  if (projection1) {
+    InstructionOperand inputs[] = {g.UseUniqueRegister(node->InputAt(0)),
+                                   g.UseUniqueRegister(node->InputAt(1)),
+                                   g.UseUniqueRegister(node->InputAt(2)),
+                                   g.UseUniqueRegister(node->InputAt(3))};
 
-  InstructionOperand outputs[] = {
-      g.DefineAsRegister(node),
-      g.DefineAsRegister(NodeProperties::FindProjection(node, 1))};
+    InstructionOperand outputs[] = {
+        g.DefineAsRegister(node),
+        g.DefineAsRegister(NodeProperties::FindProjection(node, 1))};
 
-  Emit(kS390_MulPair, 2, outputs, 4, inputs);
+    Emit(kS390_MulPair, 2, outputs, 4, inputs);
+  } else {
+    // The high word of the result is not used, so we emit the standard 32 bit
+    // instruction.
+    Emit(kS390_Mul32, g.DefineSameAsFirst(node),
+         g.UseRegister(node->InputAt(0)), g.UseRegister(node->InputAt(2)));
+  }
 }
 
-void VisitPairShift(InstructionSelector* selector, ArchOpcode opcode,
+namespace {
+// Shared routine for multiple shift operations.
+void VisitPairShift(InstructionSelector* selector, InstructionCode opcode,
                     Node* node) {
   S390OperandGenerator g(selector);
+  // We use g.UseUniqueRegister here to guarantee that there is
+  // no register aliasing of input registers with output registers.
   Int32Matcher m(node->InputAt(2));
   InstructionOperand shift_operand;
   if (m.HasValue()) {
     shift_operand = g.UseImmediate(m.node());
   } else {
     shift_operand = g.UseUniqueRegister(m.node());
   }
 
-  InstructionOperand inputs[] = {g.UseRegister(node->InputAt(0)),
-                                 g.UseRegister(node->InputAt(1)),
+  InstructionOperand inputs[] = {g.UseUniqueRegister(node->InputAt(0)),
+                                 g.UseUniqueRegister(node->InputAt(1)),
                                  shift_operand};
 
-  InstructionOperand outputs[] = {
-      g.DefineSameAsFirst(node),
-      g.DefineAsRegister(NodeProperties::FindProjection(node, 1))};
+  Node* projection1 = NodeProperties::FindProjection(node, 1);
 
-  selector->Emit(opcode, 2, outputs, 3, inputs);
+  InstructionOperand outputs[2];
+  InstructionOperand temps[1];
+  int32_t output_count = 0;
+  int32_t temp_count = 0;
+
+  outputs[output_count++] = g.DefineAsRegister(node);
+  if (projection1) {
+    outputs[output_count++] = g.DefineAsRegister(projection1);
+  } else {
+    temps[temp_count++] = g.TempRegister();
+  }
+
+  selector->Emit(opcode, output_count, outputs, 3, inputs, temp_count, temps);
 }
+}  // namespace
 
 void InstructionSelector::VisitWord32PairShl(Node* node) {
   VisitPairShift(this, kS390_ShiftLeftPair, node);
 }
 
 void InstructionSelector::VisitWord32PairShr(Node* node) {
   VisitPairShift(this, kS390_ShiftRightPair, node);
 }
 
 void InstructionSelector::VisitWord32PairSar(Node* node) {
@@ skipping 1123 matching lines @@
 // static
 MachineOperatorBuilder::AlignmentRequirements
 InstructionSelector::AlignmentRequirements() {
   return MachineOperatorBuilder::AlignmentRequirements::
       FullUnalignedAccessSupport();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8