[llvm-commits] CVS: llvm/lib/Transforms/Scalar/PredicateSimplifier.cpp

[Nick Lewycky]

Changes in directory llvm/lib/Transforms/Scalar:

PredicateSimplifier.cpp updated: 1.21 -> 1.22
---
Log message:

Handle "if ((x|y) != 0)" for ints like we do for bools. Fixes missed
optimization opportunity pointed out by Chris Lattner.


---
Diffs of the changes:  (+13 -10)

 PredicateSimplifier.cpp |   23 +++++++++++++----------
 1 files changed, 13 insertions(+), 10 deletions(-)


Index: llvm/lib/Transforms/Scalar/PredicateSimplifier.cpp
diff -u llvm/lib/Transforms/Scalar/PredicateSimplifier.cpp:1.21 
llvm/lib/Transforms/Scalar/PredicateSimplifier.cpp:1.22
--- llvm/lib/Transforms/Scalar/PredicateSimplifier.cpp:1.21     Sun Oct 22 
14:53:27 2006
+++ llvm/lib/Transforms/Scalar/PredicateSimplifier.cpp  Sun Oct 22 16:36:41 2006
@@ -334,32 +334,35 @@
           if (V1 == ConstantBool::getFalse())
             add(Opcode, BO->getOperand(0), BO->getOperand(1), true);
           break;
-        case Instruction::And:
-          if (V1 == ConstantBool::getTrue()) {
+        case Instruction::And: {
+          ConstantIntegral *CI = dyn_cast<ConstantIntegral>(V1);
+          if (CI && CI->isAllOnesValue()) {
             add(Opcode, V1, BO->getOperand(0), false);
             add(Opcode, V1, BO->getOperand(1), false);
           }
-          break;
-        case Instruction::Or:
-          if (V1 == ConstantBool::getFalse()) {
+        } break;
+        case Instruction::Or: {
+          ConstantIntegral *CI = dyn_cast<ConstantIntegral>(V1);
+          if (CI && CI->isNullValue()) {
             add(Opcode, V1, BO->getOperand(0), false);
             add(Opcode, V1, BO->getOperand(1), false);
           }
-          break;
-        case Instruction::Xor:
-          if (V1 == ConstantBool::getTrue()) {
+        } break;
+        case Instruction::Xor: {
+          ConstantIntegral *CI = dyn_cast<ConstantIntegral>(V1);
+          if (CI->isAllOnesValue()) {
             if (BO->getOperand(0) == V1)
               add(Opcode, ConstantBool::getFalse(), BO->getOperand(1), false);
             if (BO->getOperand(1) == V1)
               add(Opcode, ConstantBool::getFalse(), BO->getOperand(0), false);
           }
-          if (V1 == ConstantBool::getFalse()) {
+          if (CI->isNullValue()) {
             if (BO->getOperand(0) == ConstantBool::getTrue())
               add(Opcode, ConstantBool::getTrue(), BO->getOperand(1), false);
             if (BO->getOperand(1) == ConstantBool::getTrue())
               add(Opcode, ConstantBool::getTrue(), BO->getOperand(0), false);
           }
-          break;
+        } break;
         default:
           break;
         }



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