[x64] Regression test for https://codereview.chromium.org/1877133004

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 148e5285fbb512396f8f387147c2bde97d70130f..6d681bca85f04272fbd0758ff1d7b9c980fdd8c7 100644
--- a/test/cctest/compiler/test-run-machops.cc
+++ b/test/cctest/compiler/test-run-machops.cc
@@ -5393,6 +5393,12 @@ TEST(RunTruncateFloat64ToWord32P) {
   }
 }
 
+TEST(RunTruncateFloat64ToWord32SignExtension) {
+  BufferedRawMachineAssemblerTester<int32_t> r;
+  r.Return(r.Int32Sub(r.TruncateFloat64ToWord32(r.Float64Constant(-1.0)),
+                      r.Int32Constant(0)));
+  CHECK_EQ(-1, r.Call());
+}
 
 TEST(RunChangeFloat32ToFloat64) {
   BufferedRawMachineAssemblerTester<double> m(MachineType::Float32());