[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..1c43585778a9ac5e5a4b51d385f8d3c25d0be64d 100644
--- a/test/cctest/compiler/test-run-machops.cc
+++ b/test/cctest/compiler/test-run-machops.cc
@@ -4136,6 +4136,21 @@ TEST(RunTruncateFloat32ToInt32) {
 }
 
 
+TEST(RunTruncateFloat32ToUint32) {
+  BufferedRawMachineAssemblerTester<uint32_t> m(MachineType::Float32());
+  m.Return(m.TruncateFloat32ToUint32(m.Parameter(0)));
+
+  FOR_UINT32_INPUTS(i) {

[ahaas, 2016/01/29 10:45:08]

Could you also run tests for FOR_FLOAT32_INPUTS where the value is within
uint32_t range?

+    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));
+    }
+  }
+}
+
+
 TEST(RunChangeFloat64ToInt32_A) {
   BufferedRawMachineAssemblerTester<int32_t> m;
   double magic = 11.1;