DAGCombiner: Allow the DAGCombiner to combine multiple FDIVs with the same divisor...

[oota-llvm.git] / lib / Support / StringExtras.cpp

diff --git a/lib/Support/StringExtras.cpp b/lib/Support/StringExtras.cpp
index 65b41d526f406cbe2975ee7a8e721283fc1c265f..d77ad7f55a18e11cea396d59990dd01d557531a2 100644 (file)
--- a/lib/Support/StringExtras.cpp
+++ b/lib/Support/StringExtras.cpp
@@ -16,6 +16,19 @@
 #include "llvm/ADT/StringExtras.h"
 using namespace llvm;
 
+/// StrInStrNoCase - Portable version of strcasestr.  Locates the first
+/// occurrence of string 's1' in string 's2', ignoring case.  Returns
+/// the offset of s2 in s1 or npos if s2 cannot be found.
+StringRef::size_type llvm::StrInStrNoCase(StringRef s1, StringRef s2) {
+  size_t N = s2.size(), M = s1.size();
+  if (N > M)
+    return StringRef::npos;
+  for (size_t i = 0, e = M - N + 1; i != e; ++i)
+    if (s1.substr(i, N).equals_lower(s2))
+      return i;
+  return StringRef::npos;
+}
+
 /// getToken - This function extracts one token from source, ignoring any
 /// leading characters that appear in the Delimiters string, and ending the
 /// token at any of the characters that appear in the Delimiters string.  If
@@ -26,13 +39,11 @@ std::pair<StringRef, StringRef> llvm::getToken(StringRef Source,
                                                StringRef Delimiters) {
   // Figure out where the token starts.
   StringRef::size_type Start = Source.find_first_not_of(Delimiters);
-  if (Start == StringRef::npos) Start = Source.size();
 
   // Find the next occurrence of the delimiter.
   StringRef::size_type End = Source.find_first_of(Delimiters, Start);
-  if (End == StringRef::npos) End = Source.size();
 
-  return std::make_pair(Source.substr(Start, End), Source.substr(End));
+  return std::make_pair(Source.slice(Start, End), Source.substr(End));
 }
 
 /// SplitString - Split up the specified string according to the specified
@@ -40,31 +51,9 @@ std::pair<StringRef, StringRef> llvm::getToken(StringRef Source,
 void llvm::SplitString(StringRef Source,
                        SmallVectorImpl<StringRef> &OutFragments,
                        StringRef Delimiters) {
-  StringRef S2, S;
-  tie(S2, S) = getToken(Source, Delimiters);
-  while (!S2.empty()) {
-    OutFragments.push_back(S2);
-    tie(S2, S) = getToken(S, Delimiters);
-  }
-}
-
-void llvm::StringRef::split(SmallVectorImpl<StringRef> &A,
-                            StringRef Separators, int MaxSplit,
-                            bool KeepEmpty) const {
-  StringRef rest = *this;
-
-  // rest.data() is used to distinguish cases like "a," that splits into
-  // "a" + "" and "a" that splits into "a" + 0.
-  for (int splits = 0;
-       rest.data() != NULL && (MaxSplit < 0 || splits < MaxSplit);
-       ++splits) {
-    std::pair<llvm::StringRef, llvm::StringRef> p = rest.split(Separators);
-
-    if (p.first.size() != 0 || KeepEmpty)
-      A.push_back(p.first);
-    rest = p.second;
+  std::pair<StringRef, StringRef> S = getToken(Source, Delimiters);
+  while (!S.first.empty()) {
+    OutFragments.push_back(S.first);
+    S = getToken(S.second, Delimiters);
   }
-  // If we have a tail left, add it.
-  if (rest.data() != NULL && (rest.size() != 0 || KeepEmpty))
-    A.push_back(rest);
 }