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| author | Eli Friedman <eli.friedman@gmail.com> | 2009-05-24 20:32:10 +0000 |
|---|---|---|
| committer | Eli Friedman <eli.friedman@gmail.com> | 2009-05-24 20:32:10 +0000 |
| commit | c046c00d0a1f65483a8c69f26c66fc74f5228332 (patch) | |
| tree | 6e7b5eda823045bb0717cba96abcc22ec6b5990a /lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp | |
| parent | 57f1a4bc40e9103cd41cf541b9d6a73b92f0acba (diff) | |
Add a comment which should hopefully make the purpose of this method a
bit clearer.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72374 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp b/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp index b6f74aea41..693ac68e30 100644 --- a/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp +++ b/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp @@ -224,6 +224,9 @@ SDValue VectorLegalizer::LegalizeOp(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(); assert(Op.getNode()->getNumValues() == 1 && "Can't promote a vector with multiple results!"); |