X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2FStringRef.cpp;h=51e11004f322151a14f2105a6d0f772f183dcca2;hb=05872ea804cdc9534960b30d28a391928c61481a;hp=6905edf19e12be1dd16a547326a9e9d05dae21a8;hpb=cf62632d835313b720b68669bd1e5682d4d52d0d;p=oota-llvm.git

diff --git a/lib/Support/StringRef.cpp b/lib/Support/StringRef.cpp
index 6905edf19e1..51e11004f32 100644
--- a/lib/Support/StringRef.cpp
+++ b/lib/Support/StringRef.cpp
@@ -15,6 +15,26 @@ using namespace llvm;
 const size_t StringRef::npos;
 #endif
 
+static char ascii_tolower(char x) {
+  if (x >= 'A' && x <= 'Z')
+    return x - 'A' + 'a';
+  return x;
+}
+
+/// compare_lower - Compare strings, ignoring case.
+int StringRef::compare_lower(StringRef RHS) const {
+  for (size_t I = 0, E = std::min(Length, RHS.Length); I != E; ++I) {
+    char LHC = ascii_tolower(Data[I]);
+    char RHC = ascii_tolower(RHS.Data[I]);
+    if (LHC != RHC)
+      return LHC < RHC ? -1 : 1;
+  }
+
+  if (Length == RHS.Length)
+        return 0;
+  return Length < RHS.Length ? -1 : 1;
+}
+
 //===----------------------------------------------------------------------===//
 // String Searching
 //===----------------------------------------------------------------------===//