[llvm-branch-commits] [llvm-branch] r109241 - /llvm/branches/ggreif/waymark-64/lib/VMCore/Use.cpp

[Gabor Greif]

Author: ggreif
Date: Fri Jul 23 12:48:45 2010
New Revision: 109241

URL: http://llvm.org/viewvc/llvm-project?rev=109241&view=rev
Log:
precompute 8 tags

Modified:
    llvm/branches/ggreif/waymark-64/lib/VMCore/Use.cpp

Modified: llvm/branches/ggreif/waymark-64/lib/VMCore/Use.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/branches/ggreif/waymark-64/lib/VMCore/Use.cpp?rev=109241&r1=109240&r2=109241&view=diff
==============================================================================
--- llvm/branches/ggreif/waymark-64/lib/VMCore/Use.cpp (original)
+++ llvm/branches/ggreif/waymark-64/lib/VMCore/Use.cpp Fri Jul 23 12:48:45 2010
@@ -66,6 +66,7 @@
       case xStop64Tag:
         if (Current->Prev.getInt() == fullStop64Tag)
           return Current + 1;
+        // fall thru...
       case yStop64Tag:
         if (Current->Prev.getInt() == xStop64Tag)
           return Current + 2;
@@ -167,15 +168,16 @@
 
 template <>
 Use *Use::initTags<3>(Use * const Start, Use *Stop, ptrdiff_t Done) {
-  if (Start == Stop)
-    return Start;
-
-  if (Done == 0) {
-    ++Done;
-    --Stop;
+  while (Done < 8) {
+    if (Start == Stop--)
+      return Start;
+    static const PrevPtrTag tags[8] = { fullStop64Tag, xStop64Tag, yStop64Tag,
+                                        stop64Tag, zero64Tag, xStop64Tag,
+                                        one64Tag, stop64Tag
+                                      };
+    Stop->Prev.setFromOpaqueValue(reinterpret_cast<Use**>(tags[Done++]));
     Stop->Val = 0;
-    Stop->Prev.setFromOpaqueValue(reinterpret_cast<Use**>(fullStop64Tag));
-	}
+  }
 
   ptrdiff_t Count = Done;
   while (Start != Stop) {