From c046c00d0a1f65483a8c69f26c66fc74f5228332 Mon Sep 17 00:00:00 2001 From: Eli Friedman Date: Sun, 24 May 2009 20:32:10 +0000 Subject: [PATCH] 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 --- lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp | 3 +++ 1 file changed, 3 insertions(+) diff --git a/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp b/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp index b6f74aea41a..693ac68e30b 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!"); -- 2.34.1