[PATCH] [ValueTracking] Consider the bounds of PTX special registers

[Mark Heffernan]

================
Comment at: lib/Analysis/ValueTracking.cpp:759
@@ +758,3 @@
+      // index.html#compute-capabilities).
+      // Leveraing the bounds of these special registers can lead to more
+      // precise value analysis.
----------------
spelling nit: levaraging

================
Comment at: lib/Analysis/ValueTracking.cpp:778
@@ -756,1 +777,3 @@
+        KnownZero = APInt::getHighBitsSet(32, 32 - 16);
+        break;
       }
----------------
These values seem to be CUDA version specific.  Is there any way of guarding these?  And how will we know to update these when CUDA N+1 is supported with different values?

http://reviews.llvm.org/D4150