[llvm-commits] CVS: llvm/lib/VMCore/ConstantFolding.cpp

[Chris Lattner]

Changes in directory llvm/lib/VMCore:

ConstantFolding.cpp updated: 1.78 -> 1.79
---
Log message:

implement constant folding of ==/!= on constant packed, simplify some code.


---
Diffs of the changes:  (+11 -3)

 ConstantFolding.cpp |   14 +++++++++++---
 1 files changed, 11 insertions(+), 3 deletions(-)


Index: llvm/lib/VMCore/ConstantFolding.cpp
diff -u llvm/lib/VMCore/ConstantFolding.cpp:1.78 
llvm/lib/VMCore/ConstantFolding.cpp:1.79
--- llvm/lib/VMCore/ConstantFolding.cpp:1.78    Tue Jan  3 20:15:02 2006
+++ llvm/lib/VMCore/ConstantFolding.cpp Tue Jan  3 20:20:54 2006
@@ -385,6 +385,14 @@
     return 0;
   }
   static Constant *EqualTo(const ConstantPacked *V1, const ConstantPacked *V2) 
{
+    for (unsigned i = 0, e = V1->getNumOperands(); i != e; ++i) {
+      Constant *C = 
+        ConstantExpr::getSetEQ(const_cast<Constant*>(V1->getOperand(i)),
+                               const_cast<Constant*>(V2->getOperand(i)));
+      if (ConstantBool *CB = dyn_cast<ConstantBool>(C))
+        return CB;
+    }
+    // Otherwise, could not decide from any element pairs.
     return 0;
   }
 };
@@ -951,15 +959,15 @@
   case Instruction::SetGT:   C = ConstRules::get(V1, V2).lessthan(V2, 
V1);break;
   case Instruction::SetNE:   // V1 != V2  ===  !(V1 == V2)
     C = ConstRules::get(V1, V2).equalto(V1, V2);
-    if (C) return ConstantExpr::get(Instruction::Xor, C, ConstantBool::True);
+    if (C) return ConstantExpr::getNot(C);
     break;
   case Instruction::SetLE:   // V1 <= V2  ===  !(V2 < V1)
     C = ConstRules::get(V1, V2).lessthan(V2, V1);
-    if (C) return ConstantExpr::get(Instruction::Xor, C, ConstantBool::True);
+    if (C) return ConstantExpr::getNot(C);
     break;
   case Instruction::SetGE:   // V1 >= V2  ===  !(V1 < V2)
     C = ConstRules::get(V1, V2).lessthan(V1, V2);
-    if (C) return ConstantExpr::get(Instruction::Xor, C, ConstantBool::True);
+    if (C) return ConstantExpr::getNot(C);
     break;
   }
 



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