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

[Zhou Sheng]

Changes in directory llvm/lib/Transforms/Scalar:

InstructionCombining.cpp updated: 1.704 -> 1.705
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Log message:

Avoid unnecessary APInt construction.


---
Diffs of the changes:  (+2 -3)

 InstructionCombining.cpp |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)


Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.704 llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.705
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.704	Wed Mar 28 10:02:20 2007
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp	Wed Mar 28 12:38:21 2007
@@ -734,11 +734,10 @@
 
     // If the sign bit of the input is known set or clear, then we know the
     // top bits of the result.
-    APInt NewBits(APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth));
     if (KnownZero[SrcBitWidth-1])             // Input sign bit known zero
-      KnownZero |= NewBits;
+      KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth);
     else if (KnownOne[SrcBitWidth-1])           // Input sign bit known set
-      KnownOne |= NewBits;
+      KnownOne |= APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth);
     return;
   }
   case Instruction::Shl: