[AVX] Remove Mutating Members from Inits

Get rid of all Init members that modify internal state.  This is in
preparation for making references to Inits const.

llvm-svn: 136483

1 files changed, 8 insertions, 4 deletions

diff --git a/llvm/utils/TableGen/CodeEmitterGen.cpp b/llvm/utils/TableGen/CodeEmitterGen.cpp
index d828dfc25db..8b5cddae25e 100644
--- a/llvm/utils/TableGen/CodeEmitterGen.cpp
+++ b/llvm/utils/TableGen/CodeEmitterGen.cpp
@@ -41,19 +41,23 @@ void CodeEmitterGen::reverseBits(std::vector<Record*> &Insts) {
     BitsInit *BI = R->getValueAsBitsInit("Inst");
 
     unsigned numBits = BI->getNumBits();
-    BitsInit *NewBI = new BitsInit(numBits);
+ 
+    SmallVector<Init *, 16> NewBits(numBits);
+ 
     for (unsigned bit = 0, end = numBits / 2; bit != end; ++bit) {
       unsigned bitSwapIdx = numBits - bit - 1;
       Init *OrigBit = BI->getBit(bit);
       Init *BitSwap = BI->getBit(bitSwapIdx);
-      NewBI->setBit(bit, BitSwap);
-      NewBI->setBit(bitSwapIdx, OrigBit);
+      NewBits[bit]        = BitSwap;
+      NewBits[bitSwapIdx] = OrigBit;
     }
     if (numBits % 2) {
       unsigned middle = (numBits + 1) / 2;
-      NewBI->setBit(middle, BI->getBit(middle));
+      NewBits[middle] = BI->getBit(middle);
     }
 
+    BitsInit *NewBI = new BitsInit(ArrayRef<Init *>(NewBits));
+
     // Update the bits in reversed order so that emitInstrOpBits will get the
     // correct endianness.
     R->getValue("Inst")->setValue(NewBI);