[wasm] Int64Lowering of Word64Ctz.

src/compiler/wasm-compiler.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/compiler/wasm-compiler.h"
 
 #include "src/isolate-inl.h"
 
 #include "src/base/platform/elapsed-timer.h"
 #include "src/base/platform/platform.h"
@@ skipping 824 matching lines @@
       break;
     // kExprI64ReinterpretF64:
     case wasm::kExprI64ReinterpretF64:
       op = m->BitcastFloat64ToInt64();
       break;
     // kExprI64Clz:
     case wasm::kExprI64Clz:
       op = m->Word64Clz();
       break;
     // kExprI64Ctz:
+    case wasm::kExprI64Ctz: {
+      if (m->Word64Ctz().IsSupported()) {
+        op = m->Word64Ctz().op();
+        break;
+      } else if (m->Is32() && m->Word32Ctz().IsSupported()) {
+        op = m->Word64CtzPlaceholder();
+        break;
+      } else if (m->Word64ReverseBits().IsSupported()) {
+        Node* reversed = graph()->NewNode(m->Word64ReverseBits().op(), input);
+        Node* result = graph()->NewNode(m->Word64Clz(), reversed);
+        return result;
+      } else {
+        return BuildI64Ctz(input);
+      }
+    }
     // kExprI64Popcnt:
     case wasm::kExprI64Popcnt: {
       if (m->Word64Popcnt().IsSupported()) {
         op = m->Word64Popcnt().op();
       } else if (m->Is32() && m->Word32Popcnt().IsSupported()) {
         op = m->Word64PopcntPlaceholder();
       } else {
         return BuildI64Popcnt(input);
       }
       break;
@@ skipping 38 matching lines @@
       return BuildI64SConvertF64(input);
     }
     // kExprI64UConvertF32:
     case wasm::kExprI64UConvertF32: {
       return BuildI64UConvertF32(input);
     }
     // kExprI64UConvertF64:
     case wasm::kExprI64UConvertF64: {
       return BuildI64UConvertF64(input);
     }
-#if WASM_64
-    // Opcodes only supported on 64-bit platforms.
-    // TODO(titzer): query the machine operator builder here instead of #ifdef.
-    case wasm::kExprI64Ctz: {
-      if (m->Word64Ctz().IsSupported()) {
-        op = m->Word64Ctz().op();
-        break;
-      } else if (m->Word64ReverseBits().IsSupported()) {
-        Node* reversed = graph()->NewNode(m->Word64ReverseBits().op(), input);
-        Node* result = graph()->NewNode(m->Word64Clz(), reversed);
-        return result;
-      } else {
-        return BuildI64Ctz(input);
-      }
-    }
-#endif
     default:
       op = UnsupportedOpcode(opcode);
   }
   return graph()->NewNode(op, input);
 }
 
 
 Node* WasmGraphBuilder::Float32Constant(float value) {
   return jsgraph()->Float32Constant(value);
 }
@@ skipping 1720 matching lines @@
         static_cast<int>(function.code_end_offset - function.code_start_offset),
         decode_ms, static_cast<int>(graph.NodeCount()), compile_ms);
   }
   return code;
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8