[wasm] Trim graph before scheduling.

src/compiler/arm/code-generator-arm.cc

 // Copyright 2014 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/compiler/code-generator.h"
 
 #include "src/arm/macro-assembler-arm.h"
 #include "src/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
@@ skipping 1066 matching lines @@
       // i.InputRegister(1) ... left high word.
       // i.InputRegister(2) ... right low word.
       // i.InputRegister(3) ... right high word.
       __ umull(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
                i.InputRegister(2));
       __ mla(i.OutputRegister(1), i.InputRegister(0), i.InputRegister(3),
              i.OutputRegister(1));
       __ mla(i.OutputRegister(1), i.InputRegister(2), i.InputRegister(1),
              i.OutputRegister(1));
       break;
-    case kArmLslPair:
+    case kArmLslPair: {
+      Register second_output =
+          instr->OutputCount() >= 2 ? i.OutputRegister(1) : i.TempRegister(0);
       if (instr->InputAt(2)->IsImmediate()) {
-        __ LslPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+        __ LslPair(i.OutputRegister(0), second_output, i.InputRegister(0),
                    i.InputRegister(1), i.InputInt32(2));
       } else {
-        __ LslPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+        __ LslPair(i.OutputRegister(0), second_output, i.InputRegister(0),
                    i.InputRegister(1), kScratchReg, i.InputRegister(2));
       }
       break;
-    case kArmLsrPair:
+    }
+    case kArmLsrPair: {
+      Register second_output =
+          instr->OutputCount() >= 2 ? i.OutputRegister(1) : i.TempRegister(0);
       if (instr->InputAt(2)->IsImmediate()) {
-        __ LsrPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+        __ LsrPair(i.OutputRegister(0), second_output, i.InputRegister(0),
                    i.InputRegister(1), i.InputInt32(2));
       } else {
-        __ LsrPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+        __ LsrPair(i.OutputRegister(0), second_output, i.InputRegister(0),
                    i.InputRegister(1), kScratchReg, i.InputRegister(2));
       }
       break;
-    case kArmAsrPair:
+    }
+    case kArmAsrPair: {
+      Register second_output =
+          instr->OutputCount() >= 2 ? i.OutputRegister(1) : i.TempRegister(0);
       if (instr->InputAt(2)->IsImmediate()) {
-        __ AsrPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+        __ AsrPair(i.OutputRegister(0), second_output, i.InputRegister(0),
                    i.InputRegister(1), i.InputInt32(2));
       } else {
-        __ AsrPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+        __ AsrPair(i.OutputRegister(0), second_output, i.InputRegister(0),
                    i.InputRegister(1), kScratchReg, i.InputRegister(2));
       }
       break;
+    }
     case kArmVcmpF32:
       if (instr->InputAt(1)->IsFPRegister()) {
         __ VFPCompareAndSetFlags(i.InputFloat32Register(0),
                                  i.InputFloat32Register(1));
       } else {
         DCHECK(instr->InputAt(1)->IsImmediate());
         // 0.0 is the only immediate supported by vcmp instructions.
         DCHECK(i.InputFloat32(1) == 0.0f);
         __ VFPCompareAndSetFlags(i.InputFloat32Register(0), i.InputFloat32(1));
       }
@@ skipping 861 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8