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[APFloat] Added support for parsing float strings which contain {inf,-inf,NaN,-NaN}.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184713 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Gottesman 2013-06-24 09:58:05 +00:00
parent fdec0c7a73
commit 575694b6a7
2 changed files with 30 additions and 0 deletions
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1
include/llvm/ADT/APFloat.h
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@ -510,6 +510,7 @@ private:
/// \name Miscellany
/// @{
bool convertFromStringSpecials(StringRef str);
opStatus normalize(roundingMode, lostFraction);
opStatus addOrSubtract(const APFloat &, roundingMode, bool subtract);
cmpResult compareAbsoluteValue(const APFloat &) const;

29
lib/Support/APFloat.cpp
View File

@ -2575,11 +2575,40 @@ APFloat::convertFromDecimalString(StringRef str, roundingMode rounding_mode)
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();