fpcmp: Fix a possible infinite loop when comparing something like:

  1..19 ok
to
  1..20 o k
(yes, the odd space is necessary).

llvm-svn: 106032

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/Support/FileUtilities.cpp b/llvm/lib/Support/FileUtilities.cpp
index 095395f1223..11c1e02abab 100644
--- a/llvm/lib/Support/FileUtilities.cpp
+++ b/llvm/lib/Support/FileUtilities.cpp
@@ -51,7 +51,15 @@ static const char *BackupNumber(const char *Pos, const char *FirstChar) {
   if (!isNumberChar(*Pos)) return Pos;
 
   // Otherwise, return to the start of the number.
+  bool HasPeriod = false;
   while (Pos > FirstChar && isNumberChar(Pos[-1])) {
+    // Backup over at most one period.
+    if (Pos[-1] == '.') {
+      if (HasPeriod)
+        break;
+      HasPeriod = true;
+    }
+
     --Pos;
     if (Pos > FirstChar && isSignedChar(Pos[0]) && !isExponentChar(Pos[-1]))
       break;