Use TruncateFloat64ToInt32 instead of ChangeFloat64ToInt32 in lowering of simplified operators Numb…

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index 72c2d372e8e3888314805c5156ff3babe4e0bb8c..9ccd4ed5ef7d303c156898c6aa138f952e3719ff 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -453,10 +453,9 @@ class RepresentationSelector {
             DeferReplacement(node, node->InputAt(0));
           } else {
             // Require the input in float64 format and perform truncation.
-            // TODO(turbofan): could also avoid the truncation with a tag check.
+            // TODO(turbofan): avoid a truncation with a smi check.
             VisitUnop(node, kTypeInt32 | kRepFloat64, kTypeInt32 | kRepWord32);
-            // TODO(titzer): should be a truncation.
-            node->set_op(lowering->machine()->ChangeFloat64ToInt32());
+            node->set_op(lowering->machine()->TruncateFloat64ToInt32());
           }
         } else {
           // Propagate a type to the input, but pass through representation.
@@ -475,11 +474,10 @@ class RepresentationSelector {
             DeferReplacement(node, node->InputAt(0));
           } else {
             // Require the input in float64 format to perform truncation.
-            // TODO(turbofan): could also avoid the truncation with a tag check.
+            // TODO(turbofan): avoid the truncation with a smi check.
             VisitUnop(node, kTypeUint32 | kRepFloat64,
                       kTypeUint32 | kRepWord32);
-            // TODO(titzer): should be a truncation.
-            node->set_op(lowering->machine()->ChangeFloat64ToUint32());
+            node->set_op(lowering->machine()->TruncateFloat64ToInt32());
           }
         } else {
           // Propagate a type to the input, but pass through representation.