[wasm] Introduce custom asm.js bytecodes for double->int conversions.

test/cctest/wasm/test-run-wasm-asmjs.cc

 // Copyright 2016 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 <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "src/base/platform/elapsed-timer.h"
 
@@ skipping 52 matching lines @@
   WasmRunner<int32_t> r(MachineType::Int32(), MachineType::Int32());
   BUILD(r, WASM_BINOP(kExprI32AsmjsRemU, WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
   const int32_t kMin = std::numeric_limits<int32_t>::min();
   CHECK_EQ(17, r.Call(217, 100));
   CHECK_EQ(0, r.Call(100, 0));
   CHECK_EQ(0, r.Call(-1001, 0));
   CHECK_EQ(0, r.Call(kMin, 0));
   CHECK_EQ(kMin, r.Call(kMin, -1));
 }
 
+TEST(Run_Wasm_I32AsmjsSConvertF32) {
+  WasmRunner<int32_t> r(MachineType::Float32());
+  BUILD(r, WASM_UNOP(kExprI32AsmjsSConvertF32, WASM_GET_LOCAL(0)));
+
+  FOR_FLOAT32_INPUTS(i) {
+    int32_t expected = DoubleToInt32(*i);
+    CHECK_EQ(expected, r.Call(*i));
+  }
+}
+
+TEST(Run_Wasm_I32AsmjsSConvertF64) {
+  WasmRunner<int32_t> r(MachineType::Float64());
+  BUILD(r, WASM_UNOP(kExprI32AsmjsSConvertF64, WASM_GET_LOCAL(0)));
+
+  FOR_FLOAT64_INPUTS(i) {
+    int32_t expected = DoubleToInt32(*i);
+    CHECK_EQ(expected, r.Call(*i));
+  }
+}
+
+TEST(Run_Wasm_I32AsmjsUConvertF32) {
+  WasmRunner<uint32_t> r(MachineType::Float32());
+  BUILD(r, WASM_UNOP(kExprI32AsmjsUConvertF32, WASM_GET_LOCAL(0)));
+
+  FOR_FLOAT32_INPUTS(i) {
+    uint32_t expected = DoubleToUint32(*i);
+    CHECK_EQ(expected, r.Call(*i));
+  }
+}
+
+TEST(Run_Wasm_I32AsmjsUConvertF64) {
+  WasmRunner<uint32_t> r(MachineType::Float64());
+  BUILD(r, WASM_UNOP(kExprI32AsmjsUConvertF64, WASM_GET_LOCAL(0)));
+
+  FOR_FLOAT64_INPUTS(i) {
+    uint32_t expected = DoubleToUint32(*i);
+    CHECK_EQ(expected, r.Call(*i));
+  }
+}
+
 TEST(Run_Wasm_LoadMemI32_oob_asm) {
   TestingModule module;
   module.origin = kAsmJsOrigin;
   int32_t* memory = module.AddMemoryElems<int32_t>(8);
   WasmRunner<int32_t> r(&module, MachineType::Uint32());
   module.RandomizeMemory(1112);
 
   BUILD(r, WASM_LOAD_MEM(MachineType::Int32(), WASM_GET_LOCAL(0)));
 
   memory[0] = 999999;
   CHECK_EQ(999999, r.Call(0u));
   // TODO(titzer): offset 29-31 should also be OOB.
   for (uint32_t offset = 32; offset < 40; offset++) {
     CHECK_EQ(0, r.Call(offset));
   }
 
   for (uint32_t offset = 0x80000000; offset < 0x80000010; offset++) {
     CHECK_EQ(0, r.Call(offset));
   }
 }