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Minor optimization. sign-ext/anyext of undef is still undef.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127598 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2011-03-14 18:15:55 +00:00
parent 21a6179c9d
commit 5ae1da96f2
3 changed files with 23 additions and 5 deletions
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4
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@@ -2482,6 +2482,8 @@ SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
"Vector element count mismatch!");
if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND)
return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
else if (OpOpcode == ISD::UNDEF)
return getUNDEF(VT);
break;
case ISD::ZERO_EXTEND:
assert(VT.isInteger() && Operand.getValueType().isInteger() &&
@@ -2512,6 +2514,8 @@ SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
OpOpcode == ISD::ANY_EXTEND)
// (ext (zext x)) -> (zext x) and (ext (sext x)) -> (sext x)
return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
else if (OpOpcode == ISD::UNDEF)
return getUNDEF(VT);
// (ext (trunx x)) -> x
if (OpOpcode == ISD::TRUNCATE) {