[compiler-rt][ubsan] Add support for f16

Author: alexander-shaposhnikov

compiler-rt/lib/ubsan/ubsan_value.cpp

@@ -120,15 +120,11 @@ FloatMax Value::getFloatValue() const {
   CHECK(getType().isFloatTy());
   if (isInlineFloat()) {
     switch (getType().getFloatBitWidth()) {
-#if 0
-      // FIXME: OpenCL / NEON 'half' type. LLVM can't lower the conversion
-      //        from '__fp16' to 'long double'.
       case 16: {
         __fp16 Value;
-        internal_memcpy(&Value, &Val, 4);
+        internal_memcpy(&Value, &Val, sizeof(Value));
         return Value;
       }
-#endif
       case 32: {
         float Value;
 #if defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__

compiler-rt/test/ubsan/TestCases/Float/cast-overflow.cpp

@@ -131,14 +131,19 @@ int main(int argc, char **argv) {
     return 0;
   }
   case '5': {
-    // CHECK-5: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: {{.*}} is outside the range of representable values of type 'int'
+    // CHECK-5: {{.*}}cast-overflow.cpp:[[@LINE+1]]:28: runtime error: {{.*}} is outside the range of representable values of type 'int'
+    static int test_int =  (__fp16)Inf;
+    return 0;
+  }
+  case '6': {
+    // CHECK-6: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: {{.*}} is outside the range of representable values of type 'int'
     static int test_int = NaN;
     return 0;
   }
 
     // Integer -> floating point overflow.
-  case '6': {
-    // CHECK-6: cast-overflow.cpp:[[@LINE+2]]:{{27: runtime error: 3.40282e\+38 is outside the range of representable values of type 'int'| __int128 not supported}}
+  case '7': {
+    // CHECK-7: cast-overflow.cpp:[[@LINE+2]]:{{27: runtime error: 3.40282e\+38 is outside the range of representable values of type 'int'| __int128 not supported}}
 #if defined(__SIZEOF_INT128__) && !defined(_WIN32)
     static int test_int = (float)(FloatMaxAsUInt128 + 1);
     return 0;
@@ -149,9 +154,9 @@ int main(int argc, char **argv) {
     return 0;
 #endif
   }
-  case '7': {
+  case '8': {
     volatile long double ld = 300.0;
-    // CHECK-7: {{.*}}cast-overflow.cpp:[[@LINE+1]]:14: runtime error: 300 is outside the range of representable values of type 'char'
+    // CHECK-8: {{.*}}cast-overflow.cpp:[[@LINE+1]]:14: runtime error: 300 is outside the range of representable values of type 'char'
     char c = ld;
     // `c` is allowed to contain UNDEF, thus we should not use
     // its value as an exit code.