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

[Zhou Sheng]

Changes in directory llvm/lib/Transforms/Scalar:

InstructionCombining.cpp updated: 1.657 -> 1.658
---
Log message:

For expression like 
"APInt::getAllOnesValue(ShiftAmt).zextOrCopy(BitWidth)",
to handle ShiftAmt == BitWidth situation, use zextOrCopy() instead of 
zext().


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

 InstructionCombining.cpp |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)


Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.657 llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.658
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.657	Mon Mar 12 21:23:10 2007
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp	Tue Mar 13 01:40:59 2007
@@ -1995,7 +1995,7 @@
       RHSKnownZero <<= ShiftAmt;
       RHSKnownOne  <<= ShiftAmt;
       // low bits known zero.
-      RHSKnownZero |= APInt::getAllOnesValue(ShiftAmt).zext(BitWidth);
+      RHSKnownZero |= APInt::getAllOnesValue(ShiftAmt).zextOrCopy(BitWidth);
     }
     break;
   case Instruction::LShr:
@@ -2012,7 +2012,7 @@
       assert((RHSKnownZero & RHSKnownOne) == 0 && 
              "Bits known to be one AND zero?"); 
       // Compute the new bits that are at the top now.
-      APInt HighBits(APInt::getAllOnesValue(ShiftAmt).zext(BitWidth).shl(
+      APInt HighBits(APInt::getAllOnesValue(ShiftAmt).zextOrCopy(BitWidth).shl(
               BitWidth - ShiftAmt));
       RHSKnownZero &= TypeMask;
       RHSKnownOne  &= TypeMask;
@@ -2046,7 +2046,7 @@
       assert((RHSKnownZero & RHSKnownOne) == 0 && 
              "Bits known to be one AND zero?"); 
       // Compute the new bits that are at the top now.
-      APInt HighBits(APInt::getAllOnesValue(ShiftAmt).zext(BitWidth).shl(
+      APInt HighBits(APInt::getAllOnesValue(ShiftAmt).zextOrCopy(BitWidth).shl(
               BitWidth - ShiftAmt));
       RHSKnownZero &= TypeMask;
       RHSKnownOne  &= TypeMask;