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

[Chris Lattner]

Changes in directory llvm/lib/Transforms/Scalar:

InstructionCombining.cpp updated: 1.504 -> 1.505
---
Log message:

Fix Transforms/InstCombine/2006-09-15-CastToBool.ll and PR913: http://llvm.org/PR913 


---
Diffs of the changes:  (+5 -0)

 InstructionCombining.cpp |    5 +++++
 1 files changed, 5 insertions(+)


Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.504 llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.505
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.504	Mon Sep 11 16:43:16 2006
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp	Fri Sep 15 22:14:10 2006
@@ -1011,6 +1011,11 @@
     // If this is an integer truncate or noop, just look in the input.
     if (SrcTy->getPrimitiveSizeInBits() >= 
         I->getType()->getPrimitiveSizeInBits()) {
+      // Cast to bool is a comparison against 0, which demands all bits.  We
+      // can't propagate anything useful up.
+      if (I->getType() == Type::BoolTy)
+        break;
+      
       if (SimplifyDemandedBits(I->getOperand(0), DemandedMask,
                                KnownZero, KnownOne, Depth+1))
         return true;