[DAG] Keep the opaque constant flag when performing unary constant folding operations.

Usually opaque constants shouldn't be folded, unless they are simple unary
operations that don't create new constants. Although this shouldn't drop the
opaque constant flag. This commit fixes this.

Related to <rdar://problem/14774662>

llvm-svn: 204737

1 files changed, 12 insertions, 6 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 029011cffcc..61961d8ca2d 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2541,11 +2541,13 @@ SDValue SelectionDAG::getNode(unsigned Opcode, SDLoc DL,
     switch (Opcode) {
     default: break;
     case ISD::SIGN_EXTEND:
-      return getConstant(Val.sextOrTrunc(VT.getSizeInBits()), VT);
+      return getConstant(Val.sextOrTrunc(VT.getSizeInBits()), VT,
+                         C->isTargetOpcode(), C->isOpaque());
     case ISD::ANY_EXTEND:
     case ISD::ZERO_EXTEND:
     case ISD::TRUNCATE:
-      return getConstant(Val.zextOrTrunc(VT.getSizeInBits()), VT);
+      return getConstant(Val.zextOrTrunc(VT.getSizeInBits()), VT,
+                         C->isTargetOpcode(), C->isOpaque());
     case ISD::UINT_TO_FP:
     case ISD::SINT_TO_FP: {
       APFloat apf(EVTToAPFloatSemantics(VT),
@@ -2562,15 +2564,19 @@ SDValue SelectionDAG::getNode(unsigned Opcode, SDLoc DL,
         return getConstantFP(APFloat(APFloat::IEEEdouble, Val), VT);
       break;
     case ISD::BSWAP:
-      return getConstant(Val.byteSwap(), VT);
+      return getConstant(Val.byteSwap(), VT, C->isTargetOpcode(),
+                         C->isOpaque());
     case ISD::CTPOP:
-      return getConstant(Val.countPopulation(), VT);
+      return getConstant(Val.countPopulation(), VT, C->isTargetOpcode(),
+                         C->isOpaque());
     case ISD::CTLZ:
     case ISD::CTLZ_ZERO_UNDEF:
-      return getConstant(Val.countLeadingZeros(), VT);
+      return getConstant(Val.countLeadingZeros(), VT, C->isTargetOpcode(),
+                         C->isOpaque());
     case ISD::CTTZ:
     case ISD::CTTZ_ZERO_UNDEF:
-      return getConstant(Val.countTrailingZeros(), VT);
+      return getConstant(Val.countTrailingZeros(), VT, C->isTargetOpcode(),
+                         C->isOpaque());
     }
   }