1 files changed, 18 insertions, 0 deletions
diff --git a/compiler-rt/lib/msan/tests/msan_test.cc b/compiler-rt/lib/msan/tests/msan_test.cc
index 813606ed371..2266cdd0249 100644
--- a/compiler-rt/lib/msan/tests/msan_test.cc
+++ b/compiler-rt/lib/msan/tests/msan_test.cc
@@ -2064,8 +2064,26 @@ TEST(MemorySanitizer, fcvt) {
   char *str = fcvt(12345.6789, 10, &a, &b);
   EXPECT_NOT_POISONED(a);
   EXPECT_NOT_POISONED(b);
+  ASSERT_NE(nullptr, str);
+  EXPECT_NOT_POISONED(str[0]);
+  ASSERT_NE(0U, strlen(str));
 }
 
+TEST(MemorySanitizer, fcvt_long) {
+  int a, b;
+  break_optimization(&a);
+  break_optimization(&b);
+  EXPECT_POISONED(a);
+  EXPECT_POISONED(b);
+  char *str = fcvt(111111112345.6789, 10, &a, &b);
+  EXPECT_NOT_POISONED(a);
+  EXPECT_NOT_POISONED(b);
+  ASSERT_NE(nullptr, str);
+  EXPECT_NOT_POISONED(str[0]);
+  ASSERT_NE(0U, strlen(str));
+}
+
+
 TEST(MemorySanitizer, memchr) {
   char x[10];
   break_optimization(x);