commit 40f8f6264d5af2c38e797e0dc59827cd231e8ff7
author Jay Foad <jay.foad@gmail.com> Tue Dec 07 08:25:19 2010 +0000
committer Jay Foad <jay.foad@gmail.com> Tue Dec 07 08:25:19 2010 +0000
tree 3f3b576d6ec060c4063e4630d1ac4fad94997d82
parent 0ea112f104215ccba8d89c839cdeded6e3d49e59

PR5207: Change APInt methods trunc(), sext(), zext(), sextOrTrunc() and
zextOrTrunc(), and APSInt methods extend(), extOrTrunc() and new method
trunc(), to be const and to return a new value instead of modifying the
object in place.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121120 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp

diff --git a/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp b/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
index 5366bdd..48184c0 100644
--- a/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
+++ b/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
@@ -34,7 +34,7 @@
   if (!OpC) return false;
 
   // If there are no bits set that aren't demanded, nothing to do.
-  Demanded.zextOrTrunc(OpC->getValue().getBitWidth());
+  Demanded = Demanded.zextOrTrunc(OpC->getValue().getBitWidth());
   if ((~Demanded & OpC->getValue()) == 0)
     return false;
 
@@ -388,15 +388,15 @@
     break;
   case Instruction::Trunc: {
     unsigned truncBf = I->getOperand(0)->getType()->getScalarSizeInBits();
-    DemandedMask.zext(truncBf);
-    KnownZero.zext(truncBf);
-    KnownOne.zext(truncBf);
+    DemandedMask = DemandedMask.zext(truncBf);
+    KnownZero = KnownZero.zext(truncBf);
+    KnownOne = KnownOne.zext(truncBf);
     if (SimplifyDemandedBits(I->getOperandUse(0), DemandedMask, 
                              KnownZero, KnownOne, Depth+1))
       return I;
-    DemandedMask.trunc(BitWidth);
-    KnownZero.trunc(BitWidth);
-    KnownOne.trunc(BitWidth);
+    DemandedMask = DemandedMask.trunc(BitWidth);
+    KnownZero = KnownZero.trunc(BitWidth);
+    KnownOne = KnownOne.trunc(BitWidth);
     assert(!(KnownZero & KnownOne) && "Bits known to be one AND zero?"); 
     break;
   }
@@ -426,15 +426,15 @@
     // Compute the bits in the result that are not present in the input.
     unsigned SrcBitWidth =I->getOperand(0)->getType()->getScalarSizeInBits();
     
-    DemandedMask.trunc(SrcBitWidth);
-    KnownZero.trunc(SrcBitWidth);
-    KnownOne.trunc(SrcBitWidth);
+    DemandedMask = DemandedMask.trunc(SrcBitWidth);
+    KnownZero = KnownZero.trunc(SrcBitWidth);
+    KnownOne = KnownOne.trunc(SrcBitWidth);
     if (SimplifyDemandedBits(I->getOperandUse(0), DemandedMask,
                              KnownZero, KnownOne, Depth+1))
       return I;
-    DemandedMask.zext(BitWidth);
-    KnownZero.zext(BitWidth);
-    KnownOne.zext(BitWidth);
+    DemandedMask = DemandedMask.zext(BitWidth);
+    KnownZero = KnownZero.zext(BitWidth);
+    KnownOne = KnownOne.zext(BitWidth);
     assert(!(KnownZero & KnownOne) && "Bits known to be one AND zero?"); 
     // The top bits are known to be zero.
     KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth);
@@ -453,15 +453,15 @@
     if ((NewBits & DemandedMask) != 0)
       InputDemandedBits.setBit(SrcBitWidth-1);
       
-    InputDemandedBits.trunc(SrcBitWidth);
-    KnownZero.trunc(SrcBitWidth);
-    KnownOne.trunc(SrcBitWidth);
+    InputDemandedBits = InputDemandedBits.trunc(SrcBitWidth);
+    KnownZero = KnownZero.trunc(SrcBitWidth);
+    KnownOne = KnownOne.trunc(SrcBitWidth);
     if (SimplifyDemandedBits(I->getOperandUse(0), InputDemandedBits,
                              KnownZero, KnownOne, Depth+1))
       return I;
-    InputDemandedBits.zext(BitWidth);
-    KnownZero.zext(BitWidth);
-    KnownOne.zext(BitWidth);
+    InputDemandedBits = InputDemandedBits.zext(BitWidth);
+    KnownZero = KnownZero.zext(BitWidth);
+    KnownOne = KnownOne.zext(BitWidth);
     assert(!(KnownZero & KnownOne) && "Bits known to be one AND zero?"); 
       
     // If the sign bit of the input is known set or clear, then we know the