Avoid undefined cast to make ASAN happy.
diff --git a/double-conversion/strtod.cc b/double-conversion/strtod.cc
index 4392ae6..bfdf924 100644
--- a/double-conversion/strtod.cc
+++ b/double-conversion/strtod.cc
@@ -483,7 +483,27 @@
double double_guess;
bool is_correct = ComputeGuess(trimmed, exponent, &double_guess);
- float float_guess = static_cast<float>(double_guess);
+ // ASAN has a sanitize check that disallows casting doubles to floats if
+ // they are too big.
+ // https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html#available-checks
+ // The behavior should be covered by IEEE 754, but some projects use this
+ // flag, so work around it.
+ float max_finite = 3.4028234663852885981170418348451692544e+38;
+ // The half-way point between the max-finite and infinity value.
+ // Since infinity has an even significand everything equal or greater than
+ // this value should become infinity.
+ double half_max_finite_infinity =
+ 3.40282356779733661637539395458142568448e+38;
+ float float_guess;
+ if (double_guess >= max_finite) {
+ if (double_guess >= half_max_finite_infinity) {
+ float_guess = Single::Infinity();
+ } else {
+ float_guess = max_finite;
+ }
+ } else {
+ float_guess = static_cast<float>(double_guess);
+ }
if (float_guess == double_guess) {
// This shortcut triggers for integer values.
return float_guess;
