[wasm] Implement simd lowering for F32x4 and I32x4 compare ops

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 <memory>
 
 #include "src/assembler-inl.h"
 #include "src/base/platform/elapsed-timer.h"
@@ skipping 3389 matching lines @@
                               inputs[1]);
     case wasm::kExprF32x4Max:
       return graph()->NewNode(jsgraph()->machine()->Float32x4Max(), inputs[0],
                               inputs[1]);
     case wasm::kExprF32x4Eq:
       return graph()->NewNode(jsgraph()->machine()->Float32x4Equal(), inputs[0],
                               inputs[1]);
     case wasm::kExprF32x4Ne:
       return graph()->NewNode(jsgraph()->machine()->Float32x4NotEqual(),
                               inputs[0], inputs[1]);
+    case wasm::kExprF32x4Gt:
+      return graph()->NewNode(jsgraph()->machine()->Float32x4GreaterThan(),
+                              inputs[0], inputs[1]);
+    case wasm::kExprF32x4Ge:
+      return graph()->NewNode(
+          jsgraph()->machine()->Float32x4GreaterThanOrEqual(), inputs[0],
+          inputs[1]);
+    case wasm::kExprF32x4Lt:
+      return graph()->NewNode(jsgraph()->machine()->Float32x4LessThan(),
+                              inputs[0], inputs[1]);
+    case wasm::kExprF32x4Le:
+      return graph()->NewNode(jsgraph()->machine()->Float32x4LessThanOrEqual(),
+                              inputs[0], inputs[1]);

[bbudge, 2017/03/02 18:29:09]

Follow the pattern below where Lt and Le are implemented with Ge and Gt,
switching the order of the inputs. We should probably also remove the redundant
machine operators.

[bbudge, 2017/03/02 23:10:59]

Just add a TODO to make the machine operators minimal (lt and le).

     case wasm::kExprI32x4Splat:
       return graph()->NewNode(jsgraph()->machine()->Int32x4Splat(), inputs[0]);
     case wasm::kExprI32x4SConvertF32x4:
       return graph()->NewNode(jsgraph()->machine()->Int32x4FromFloat32x4(),
                               inputs[0]);
     case wasm::kExprI32x4UConvertF32x4:
       return graph()->NewNode(jsgraph()->machine()->Uint32x4FromFloat32x4(),
                               inputs[0]);
     case wasm::kExprI32x4Neg:
       return graph()->NewNode(jsgraph()->machine()->Int32x4Neg(), inputs[0]);
@@ skipping 742 matching lines @@
            function_->code_end_offset - function_->code_start_offset,
            codegen_ms);
   }
 
   return code;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8