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Add a comment which should hopefully make the purpose of this method a

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bit clearer.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72374 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2009-05-24 20:32:10 +00:00
parent 57f1a4bc40
commit c046c00d0a
1 changed files with 3 additions and 0 deletions
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3
lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
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@ -224,6 +224,9 @@ SDValue VectorLegalizer::LegalizeOp(SDValue Op) {
} }
SDValue VectorLegalizer::PromoteVectorOp(SDValue Op) { SDValue VectorLegalizer::PromoteVectorOp(SDValue Op) {
// Vector "promotion" is basically just bitcasting and doing the operation
// in a different type. For example, x86 promotes ISD::AND on v2i32 to
// v1i64.
MVT VT = Op.getValueType(); MVT VT = Op.getValueType();
assert(Op.getNode()->getNumValues() == 1 && assert(Op.getNode()->getNumValues() == 1 &&
"Can't promote a vector with multiple results!"); "Can't promote a vector with multiple results!");