[llvm-commits] [llvm] r49928 - /llvm/trunk/lib/Analysis/ScalarEvolution.cpp

[Dale Johannesen]

Author: johannes
Date: Fri Apr 18 16:38:31 2008
New Revision: 49928

URL: http://llvm.org/viewvc/llvm-project?rev=49928&view=rev
Log:
Fix a scalar evolution bug.  Reversing everything
does not work because of 0; 2>0 but -2U is also >0.


Modified:
    llvm/trunk/lib/Analysis/ScalarEvolution.cpp

Modified: llvm/trunk/lib/Analysis/ScalarEvolution.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/ScalarEvolution.cpp?rev=49928&r1=49927&r2=49928&view=diff

==============================================================================
--- llvm/trunk/lib/Analysis/ScalarEvolution.cpp (original)
+++ llvm/trunk/lib/Analysis/ScalarEvolution.cpp Fri Apr 18 16:38:31 2008
@@ -1980,8 +1980,7 @@
     break;
   }
   case ICmpInst::ICMP_UGT: {
-    SCEVHandle TC = HowManyLessThans(SE.getNegativeSCEV(LHS),
-                                     SE.getNegativeSCEV(RHS), L, false);
+    SCEVHandle TC = HowFarToZero(SE.getMinusSCEV(LHS, RHS), L);
     if (!isa<SCEVCouldNotCompute>(TC)) return TC;
     break;
   }