[turbofan] Add TruncateFloat32ToUint32 operator to Turbofan.

test/cctest/compiler/test-run-machops.cc

Index: test/cctest/compiler/test-run-machops.cc
diff --git a/test/cctest/compiler/test-run-machops.cc b/test/cctest/compiler/test-run-machops.cc
index 52672c8a89204cdf1fcc7d275311813bbeaf9a46..19f677b157dbf191b4026b90715e49f614233c06 100644
--- a/test/cctest/compiler/test-run-machops.cc
+++ b/test/cctest/compiler/test-run-machops.cc
@@ -4136,6 +4136,30 @@ TEST(RunTruncateFloat32ToInt32) {
 }
 
 
+TEST(RunTruncateFloat32ToUint32) {
+  BufferedRawMachineAssemblerTester<uint32_t> m(MachineType::Float32());
+  m.Return(m.TruncateFloat32ToUint32(m.Parameter(0)));
+  {
+    FOR_UINT32_INPUTS(i) {
+      float input = static_cast<float>(*i);
+      // This condition on 'input' is required because
+      // static_cast<float>(UINT32_MAX) results in a value outside uint32 range.
+      if (input < static_cast<float>(UINT32_MAX)) {
+        CHECK_EQ(static_cast<uint32_t>(input), m.Call(input));
+      }
+    }
+  }
+  {
+    FOR_FLOAT32_INPUTS(i) {
+      if (*i <= static_cast<float>(std::numeric_limits<uint32_t>::max()) &&

[ahaas, 2016/02/03 13:47:02]

Nit: I think you should use either UINT32_MAX or
std::numeric_limits<uint32_t>::max(), but not both in the same test.

+          *i >= static_cast<float>(std::numeric_limits<uint32_t>::min())) {
+        CheckFloatEq(static_cast<uint32_t>(*i), m.Call(*i));
+      }
+    }
+  }
+}
+
+
 TEST(RunChangeFloat64ToInt32_A) {
   BufferedRawMachineAssemblerTester<int32_t> m;
   double magic = 11.1;