[APFloat] Added support for parsing float strings which contain {inf,-inf,NaN,-NaN}.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184713 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/APFloat.cpp b/lib/Support/APFloat.cpp
index ec50064..4179231 100644
--- a/lib/Support/APFloat.cpp
+++ b/lib/Support/APFloat.cpp
@@ -2575,11 +2575,40 @@
return fs;
}
+bool
+APFloat::convertFromStringSpecials(StringRef str) {
+ if (str.equals("inf") || str.equals("INFINITY")) {
+ makeInf(false);
+ return true;
+ }
+
+ if (str.equals("-inf") || str.equals("-INFINITY")) {
+ makeInf(true);
+ return true;
+ }
+
+ if (str.equals("nan") || str.equals("NaN")) {
+ makeNaN(false, false);
+ return true;
+ }
+
+ if (str.equals("-nan") || str.equals("-NaN")) {
+ makeNaN(false, true);
+ return true;
+ }
+
+ return false;
+}
+
APFloat::opStatus
APFloat::convertFromString(StringRef str, roundingMode rounding_mode)
{
assert(!str.empty() && "Invalid string length");
+ // Handle special cases.
+ if (convertFromStringSpecials(str))
+ return opOK;
+
/* Handle a leading minus sign. */
StringRef::iterator p = str.begin();
size_t slen = str.size();