-/// getUniqueFilename - Return a filename with the specified prefix. If the
-/// file does not exist yet, return it, otherwise add a suffix to make it
-/// unique.
-///
-std::string llvm::getUniqueFilename(const std::string &FilenameBase) {
- if (!std::ifstream(FilenameBase.c_str()))
- return FilenameBase; // Couldn't open the file? Use it!
+/// CompareNumbers - compare two numbers, returning true if they are different.
+static bool CompareNumbers(const char *&F1P, const char *&F2P,
+ const char *F1End, const char *F2End,
+ double AbsTolerance, double RelTolerance,
+ std::string *ErrorMsg) {
+ const char *F1NumEnd, *F2NumEnd;
+ double V1 = 0.0, V2 = 0.0;
+
+ // If one of the positions is at a space and the other isn't, chomp up 'til
+ // the end of the space.
+ while (isspace(static_cast<unsigned char>(*F1P)) && F1P != F1End)
+ ++F1P;
+ while (isspace(static_cast<unsigned char>(*F2P)) && F2P != F2End)
+ ++F2P;
+
+ // If we stop on numbers, compare their difference.
+ if (!isNumberChar(*F1P) || !isNumberChar(*F2P)) {
+ // The diff failed.
+ F1NumEnd = F1P;
+ F2NumEnd = F2P;
+ } else {
+ // Note that some ugliness is built into this to permit support for numbers
+ // that use "D" or "d" as their exponential marker, e.g. "1.234D45". This
+ // occurs in 200.sixtrack in spec2k.
+ V1 = strtod(F1P, const_cast<char**>(&F1NumEnd));
+ V2 = strtod(F2P, const_cast<char**>(&F2NumEnd));
+
+ if (*F1NumEnd == 'D' || *F1NumEnd == 'd') {
+ // Copy string into tmp buffer to replace the 'D' with an 'e'.
+ SmallString<200> StrTmp(F1P, EndOfNumber(F1NumEnd)+1);
+ // Strange exponential notation!
+ StrTmp[static_cast<unsigned>(F1NumEnd-F1P)] = 'e';
+
+ V1 = strtod(&StrTmp[0], const_cast<char**>(&F1NumEnd));
+ F1NumEnd = F1P + (F1NumEnd-&StrTmp[0]);
+ }