workaround gcc

Author: SchrodingerZhu

libc/src/__support/FPUtil/except_value_utils.h

@@ -81,18 +81,19 @@ template <typename T, size_t N> struct ExceptValues {
         StorageType out_bits = values[i].rnd_towardzero_result;
         switch (fputil::quick_get_round()) {
         case FE_UPWARD:
-          out_bits += static_cast<decltype(out_bits)>(
-              sign ? values[i].rnd_downward_offset
-                   : values[i].rnd_upward_offset);
+          if (sign)
+            out_bits += values[i].rnd_downward_offset;
+          else
+            out_bits += values[i].rnd_upward_offset;
           break;
         case FE_DOWNWARD:
-          out_bits += static_cast<decltype(out_bits)>(
-              sign ? values[i].rnd_upward_offset
-                   : values[i].rnd_downward_offset);
+          if (sign)
+            out_bits += values[i].rnd_upward_offset;
+          else
+            out_bits += values[i].rnd_downward_offset;
           break;
         case FE_TONEAREST:
-          out_bits +=
-              static_cast<decltype(out_bits)>(values[i].rnd_tonearest_offset);
+          out_bits += values[i].rnd_tonearest_offset;
           break;
         }
         T result = FPBits<T>(out_bits).get_val();