[turbofan] Add backend support for float32 operations.

test/cctest/compiler/codegen-tester.h

 // 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.
 
 #ifndef V8_CCTEST_COMPILER_CODEGEN_TESTER_H_
 #define V8_CCTEST_COMPILER_CODEGEN_TESTER_H_
 
 #include "src/v8.h"
 
 #include "src/compiler/instruction-selector.h"
@@ skipping 125 matching lines @@
   Node* param0;
   Node* param1;
 
   CType call(CType a0, CType a1) {
     p0 = a0;
     p1 = a1;
     if (use_result_buffer) {
       CHECK_EQ(CHECK_VALUE, T->Call());
       return result;
     } else {
-      return T->Call();
+      return static_cast<CType>(T->Call());
     }
   }
 
   void AddReturn(Node* val) {
     if (use_result_buffer) {
       T->Store(rep, T->PointerConstant(&result), T->Int32Constant(0), val);
       T->Return(T->Int32Constant(CHECK_VALUE));
     } else {
       T->Return(val);
     }
@@ skipping 36 matching lines @@
       : BinopTester<uint32_t, kMachUint32, USE_RETURN_REGISTER>(tester) {}
 
   uint32_t call(uint32_t a0, uint32_t a1) {
     p0 = a0;
     p1 = a1;
     return static_cast<uint32_t>(T->Call());
   }
 };
 
 
+// A helper class for testing code sequences that take two float parameters and
+// return a float value.
+// TODO(titzer): figure out how to return floats correctly on ia32.
+class Float32BinopTester
+    : public BinopTester<float, kMachFloat32, USE_RESULT_BUFFER> {
+ public:
+  explicit Float32BinopTester(RawMachineAssemblerTester<int32_t>* tester)
+      : BinopTester<float, kMachFloat32, USE_RESULT_BUFFER>(tester) {}
+};
+
+
 // A helper class for testing code sequences that take two double parameters and
 // return a double value.
 // TODO(titzer): figure out how to return doubles correctly on ia32.
 class Float64BinopTester
     : public BinopTester<double, kMachFloat64, USE_RESULT_BUFFER> {
  public:
   explicit Float64BinopTester(RawMachineAssemblerTester<int32_t>* tester)
       : BinopTester<double, kMachFloat64, USE_RESULT_BUFFER>(tester) {}
 };
 
@@ skipping 114 matching lines @@
   BinopGen<int32_t>* gen;
   int32_t input_a;
   int32_t input_b;
 
   void Run(RawMachineAssemblerTester<int32_t>* m);
   void RunLeft(RawMachineAssemblerTester<int32_t>* m);
   void RunRight(RawMachineAssemblerTester<int32_t>* m);
 };
 
 // TODO(bmeurer): Drop this crap once we switch to GTest/Gmock.
+static inline void CheckFloatEq(volatile float x, volatile float y) {
+  if (std::isnan(x)) {
+    CHECK(std::isnan(y));
+  } else {
+    CHECK(x == y);
+  }
+}
+
 static inline void CheckDoubleEq(volatile double x, volatile double y) {
   if (std::isnan(x)) {
     CHECK(std::isnan(y));
   } else {
     CHECK_EQ(x, y);
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CCTEST_COMPILER_CODEGEN_TESTER_H_