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

[Zhou Sheng]

Changes in directory llvm/lib/Transforms/Scalar:

InstructionCombining.cpp updated: 1.707 -> 1.708
---
Log message:

Clean up some codes in InstCombiner::SimplifyDemandedBits().


---
Diffs of the changes:  (+6 -12)

 InstructionCombining.cpp |   18 ++++++------------
 1 files changed, 6 insertions(+), 12 deletions(-)


Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.707 
llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.708
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.707   Wed Mar 28 
21:26:30 2007
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp Wed Mar 28 23:45:55 2007
@@ -1135,10 +1135,9 @@
     uint32_t SrcBitWidth = SrcTy->getBitWidth();
     
     DemandedMask &= SrcTy->getMask().zext(BitWidth);
-    uint32_t zextBf = SrcTy->getBitWidth();
-    DemandedMask.trunc(zextBf);
-    RHSKnownZero.trunc(zextBf);
-    RHSKnownOne.trunc(zextBf);
+    DemandedMask.trunc(SrcBitWidth);
+    RHSKnownZero.trunc(SrcBitWidth);
+    RHSKnownOne.trunc(SrcBitWidth);
     if (SimplifyDemandedBits(I->getOperand(0), DemandedMask,
                              RHSKnownZero, RHSKnownOne, Depth+1))
       return true;
@@ -1168,10 +1167,9 @@
     if ((NewBits & DemandedMask) != 0)
       InputDemandedBits |= InSignBit;
       
-    uint32_t sextBf = SrcTy->getBitWidth();
-    InputDemandedBits.trunc(sextBf);
-    RHSKnownZero.trunc(sextBf);
-    RHSKnownOne.trunc(sextBf);
+    InputDemandedBits.trunc(SrcBitWidth);
+    RHSKnownZero.trunc(SrcBitWidth);
+    RHSKnownOne.trunc(SrcBitWidth);
     if (SimplifyDemandedBits(I->getOperand(0), InputDemandedBits,
                              RHSKnownZero, RHSKnownOne, Depth+1))
       return true;
@@ -1193,10 +1191,6 @@
       return UpdateValueUsesWith(I, NewCast);
     } else if (RHSKnownOne[SrcBitWidth-1]) {    // Input sign bit known set
       RHSKnownOne |= NewBits;
-      RHSKnownZero &= ~NewBits;
-    } else {                              // Input sign bit unknown
-      RHSKnownZero &= ~NewBits;
-      RHSKnownOne &= ~NewBits;
     }
     break;
   }



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